djm@openbsd.org | 96bd895 | 2020-02-06 22:48:23 +0000 | [diff] [blame] | 1 | /* $OpenBSD: sshconnect2.c,v 1.320 2020/02/06 22:48:23 djm Exp $ */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 4 | * Copyright (c) 2008 Damien Miller. All rights reserved. |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #include "includes.h" |
Damien Miller | 2eb6340 | 2006-03-15 11:09:42 +1100 | [diff] [blame] | 28 | |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 29 | #include <sys/types.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 30 | #include <sys/socket.h> |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 31 | #include <sys/wait.h> |
Damien Miller | f17883e | 2006-03-15 11:45:54 +1100 | [diff] [blame] | 32 | #include <sys/stat.h> |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 33 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 34 | #include <errno.h> |
Darren Tucker | 6e7fe1c | 2010-01-08 17:07:22 +1100 | [diff] [blame] | 35 | #include <fcntl.h> |
Darren Tucker | f520ea1 | 2007-05-20 15:11:33 +1000 | [diff] [blame] | 36 | #include <netdb.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 37 | #include <pwd.h> |
| 38 | #include <signal.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 39 | #include <stdio.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 40 | #include <string.h> |
deraadt@openbsd.org | 72687c8 | 2019-11-13 04:47:52 +0000 | [diff] [blame] | 41 | #include <stdarg.h> |
Damien Miller | 1cdde6f | 2006-07-24 14:07:35 +1000 | [diff] [blame] | 42 | #include <unistd.h> |
Damien Miller | 63b4bcd | 2013-03-20 12:55:14 +1100 | [diff] [blame] | 43 | #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS) |
Damien Miller | 7ba0ca7 | 2008-07-17 18:57:06 +1000 | [diff] [blame] | 44 | #include <vis.h> |
Damien Miller | 2e28d86 | 2008-07-17 19:15:43 +1000 | [diff] [blame] | 45 | #endif |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 46 | |
Damien Miller | 9c61769 | 2003-05-14 14:31:11 +1000 | [diff] [blame] | 47 | #include "openbsd-compat/sys-queue.h" |
| 48 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 49 | #include "xmalloc.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 50 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 51 | #include "ssh2.h" |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 52 | #include "sshbuf.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 53 | #include "packet.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 54 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 55 | #include "cipher.h" |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 56 | #include "sshkey.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 57 | #include "kex.h" |
| 58 | #include "myproposal.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 59 | #include "sshconnect.h" |
| 60 | #include "authfile.h" |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 61 | #include "dh.h" |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 62 | #include "authfd.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 63 | #include "log.h" |
Darren Tucker | e608ca2 | 2004-05-13 16:15:47 +1000 | [diff] [blame] | 64 | #include "misc.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 65 | #include "readconf.h" |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 66 | #include "match.h" |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 67 | #include "dispatch.h" |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 68 | #include "canohost.h" |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 69 | #include "msg.h" |
| 70 | #include "pathnames.h" |
Damien Miller | 6b4069a | 2006-06-13 13:05:15 +1000 | [diff] [blame] | 71 | #include "uidswap.h" |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 72 | #include "hostfile.h" |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 73 | #include "ssherr.h" |
djm@openbsd.org | 65c6c6b | 2016-07-17 04:20:16 +0000 | [diff] [blame] | 74 | #include "utf8.h" |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 75 | #include "ssh-sk.h" |
djm@openbsd.org | e44bb61 | 2019-11-12 22:36:44 +0000 | [diff] [blame] | 76 | #include "sk-api.h" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 77 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 78 | #ifdef GSSAPI |
| 79 | #include "ssh-gss.h" |
| 80 | #endif |
| 81 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 82 | /* import */ |
| 83 | extern char *client_version_string; |
| 84 | extern char *server_version_string; |
| 85 | extern Options options; |
| 86 | |
| 87 | /* |
| 88 | * SSH2 key exchange |
| 89 | */ |
| 90 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 91 | u_char *session_id2 = NULL; |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 92 | u_int session_id2_len = 0; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 93 | |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 94 | char *xxx_host; |
| 95 | struct sockaddr *xxx_hostaddr; |
| 96 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 97 | static int |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 98 | verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh) |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 99 | { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 100 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
Damien Miller | 59d9fb9 | 2001-10-10 15:03:11 +1000 | [diff] [blame] | 101 | fatal("Host key verification failed."); |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 102 | return 0; |
| 103 | } |
| 104 | |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 105 | static char * |
| 106 | order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port) |
| 107 | { |
| 108 | char *oavail, *avail, *first, *last, *alg, *hostname, *ret; |
| 109 | size_t maxlen; |
| 110 | struct hostkeys *hostkeys; |
| 111 | int ktype; |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 112 | u_int i; |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 113 | |
| 114 | /* Find all hostkeys for this hostname */ |
| 115 | get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL); |
| 116 | hostkeys = init_hostkeys(); |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 117 | for (i = 0; i < options.num_user_hostfiles; i++) |
| 118 | load_hostkeys(hostkeys, hostname, options.user_hostfiles[i]); |
| 119 | for (i = 0; i < options.num_system_hostfiles; i++) |
| 120 | load_hostkeys(hostkeys, hostname, options.system_hostfiles[i]); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 121 | |
djm@openbsd.org | 96bd895 | 2020-02-06 22:48:23 +0000 | [diff] [blame] | 122 | oavail = avail = xstrdup(options.hostkeyalgorithms); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 123 | maxlen = strlen(avail) + 1; |
| 124 | first = xmalloc(maxlen); |
| 125 | last = xmalloc(maxlen); |
| 126 | *first = *last = '\0'; |
| 127 | |
| 128 | #define ALG_APPEND(to, from) \ |
| 129 | do { \ |
| 130 | if (*to != '\0') \ |
| 131 | strlcat(to, ",", maxlen); \ |
| 132 | strlcat(to, from, maxlen); \ |
| 133 | } while (0) |
| 134 | |
| 135 | while ((alg = strsep(&avail, ",")) && *alg != '\0') { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 136 | if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC) |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 137 | fatal("%s: unknown alg %s", __func__, alg); |
| 138 | if (lookup_key_in_hostkeys_by_type(hostkeys, |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 139 | sshkey_type_plain(ktype), NULL)) |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 140 | ALG_APPEND(first, alg); |
| 141 | else |
| 142 | ALG_APPEND(last, alg); |
| 143 | } |
| 144 | #undef ALG_APPEND |
djm@openbsd.org | 35d6022 | 2015-01-18 13:33:34 +0000 | [diff] [blame] | 145 | xasprintf(&ret, "%s%s%s", first, |
| 146 | (*first == '\0' || *last == '\0') ? "" : ",", last); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 147 | if (*first != '\0') |
| 148 | debug3("%s: prefer hostkeyalgs: %s", __func__, first); |
| 149 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 150 | free(first); |
| 151 | free(last); |
| 152 | free(hostname); |
| 153 | free(oavail); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 154 | free_hostkeys(hostkeys); |
| 155 | |
| 156 | return ret; |
| 157 | } |
| 158 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 159 | void |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 160 | ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 161 | { |
Damien Miller | 9235a03 | 2014-04-20 13:17:20 +1000 | [diff] [blame] | 162 | char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; |
djm@openbsd.org | 312d2f2 | 2018-07-04 13:49:31 +0000 | [diff] [blame] | 163 | char *s, *all_key; |
djm@openbsd.org | 96bd895 | 2020-02-06 22:48:23 +0000 | [diff] [blame] | 164 | int r, use_known_hosts_order = 0; |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 165 | |
| 166 | xxx_host = host; |
| 167 | xxx_hostaddr = hostaddr; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 168 | |
djm@openbsd.org | 96bd895 | 2020-02-06 22:48:23 +0000 | [diff] [blame] | 169 | /* |
| 170 | * If the user has not specified HostkeyAlgorithms, or has only |
| 171 | * appended or removed algorithms from that list then prefer algorithms |
| 172 | * that are in the list that are supported by known_hosts keys. |
| 173 | */ |
| 174 | if (options.hostkeyalgorithms == NULL || |
| 175 | options.hostkeyalgorithms[0] == '-' || |
| 176 | options.hostkeyalgorithms[0] == '+') |
| 177 | use_known_hosts_order = 1; |
| 178 | |
| 179 | /* Expand or fill in HostkeyAlgorithms */ |
| 180 | all_key = sshkey_alg_list(0, 0, 1, ','); |
| 181 | if (kex_assemble_names(&options.hostkeyalgorithms, |
| 182 | kex_default_pk_alg(), all_key) != 0) |
| 183 | fatal("%s: kex_assemble_namelist", __func__); |
| 184 | free(all_key); |
| 185 | |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 186 | if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL) |
| 187 | fatal("%s: kex_names_cat", __func__); |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 188 | myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(s); |
Damien Miller | a0ff466 | 2001-03-30 10:49:35 +1000 | [diff] [blame] | 189 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 190 | compat_cipher_proposal(options.ciphers); |
Damien Miller | a0ff466 | 2001-03-30 10:49:35 +1000 | [diff] [blame] | 191 | myproposal[PROPOSAL_ENC_ALGS_STOC] = |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 192 | compat_cipher_proposal(options.ciphers); |
dtucker@openbsd.org | 8c02e36 | 2016-05-24 04:43:45 +0000 | [diff] [blame] | 193 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
dtucker@openbsd.org | 7f8e66f | 2020-01-23 10:24:29 +0000 | [diff] [blame] | 194 | myproposal[PROPOSAL_COMP_ALGS_STOC] = |
| 195 | (char *)compression_alg_list(options.compression); |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 196 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = |
| 197 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; |
djm@openbsd.org | 96bd895 | 2020-02-06 22:48:23 +0000 | [diff] [blame] | 198 | if (use_known_hosts_order) { |
| 199 | /* Query known_hosts and prefer algorithms that appear there */ |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 200 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 201 | compat_pkalg_proposal( |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 202 | order_hostkeyalgs(host, hostaddr, port)); |
djm@openbsd.org | 96bd895 | 2020-02-06 22:48:23 +0000 | [diff] [blame] | 203 | } else { |
| 204 | /* Use specified HostkeyAlgorithms exactly */ |
| 205 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
| 206 | compat_pkalg_proposal(options.hostkeyalgorithms); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 207 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 208 | |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 209 | if (options.rekey_limit || options.rekey_interval) |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 210 | ssh_packet_set_rekey_limits(ssh, options.rekey_limit, |
dtucker@openbsd.org | c998bf0 | 2017-02-03 02:56:00 +0000 | [diff] [blame] | 211 | options.rekey_interval); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 212 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 213 | /* start key exchange */ |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 214 | if ((r = kex_setup(ssh, myproposal)) != 0) |
markus@openbsd.org | 57e783c | 2015-01-20 20:16:21 +0000 | [diff] [blame] | 215 | fatal("kex_setup: %s", ssh_err(r)); |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 216 | #ifdef WITH_OPENSSL |
djm@openbsd.org | aaca72d | 2019-01-21 10:40:11 +0000 | [diff] [blame] | 217 | ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client; |
| 218 | ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client; |
| 219 | ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client; |
| 220 | ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client; |
| 221 | ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client; |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 222 | ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
| 223 | ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
Darren Tucker | f2004cd | 2015-02-23 05:04:21 +1100 | [diff] [blame] | 224 | # ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | aaca72d | 2019-01-21 10:40:11 +0000 | [diff] [blame] | 225 | ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client; |
Darren Tucker | f2004cd | 2015-02-23 05:04:21 +1100 | [diff] [blame] | 226 | # endif |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 227 | #endif |
djm@openbsd.org | aaca72d | 2019-01-21 10:40:11 +0000 | [diff] [blame] | 228 | ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client; |
| 229 | ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_client; |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 230 | ssh->kex->verify_host_key=&verify_host_key_callback; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 231 | |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 232 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &ssh->kex->done); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 233 | |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 234 | /* remove ext-info from the KEX proposals for rekeying */ |
| 235 | myproposal[PROPOSAL_KEX_ALGS] = |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 236 | compat_kex_proposal(options.kex_algorithms); |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 237 | if ((r = kex_prop2buf(ssh->kex->my, myproposal)) != 0) |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 238 | fatal("kex_prop2buf: %s", ssh_err(r)); |
Darren Tucker | 36331b5 | 2010-01-08 16:50:41 +1100 | [diff] [blame] | 239 | |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 240 | session_id2 = ssh->kex->session_id; |
| 241 | session_id2_len = ssh->kex->session_id_len; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 242 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 243 | #ifdef DEBUG_KEXDH |
| 244 | /* send 1st encrypted/maced/compressed message */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 245 | if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE)) != 0 || |
| 246 | (r = sshpkt_put_cstring(ssh, "markus")) != 0 || |
markus@openbsd.org | 394a842 | 2018-07-11 18:55:11 +0000 | [diff] [blame] | 247 | (r = sshpkt_send(ssh)) != 0 || |
| 248 | (r = ssh_packet_write_wait(ssh)) != 0) |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 249 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 250 | #endif |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 251 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 252 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 253 | /* |
| 254 | * Authenticate user |
| 255 | */ |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 256 | |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 257 | typedef struct cauthctxt Authctxt; |
| 258 | typedef struct cauthmethod Authmethod; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 259 | typedef struct identity Identity; |
| 260 | typedef struct idlist Idlist; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 261 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 262 | struct identity { |
| 263 | TAILQ_ENTRY(identity) next; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 264 | int agent_fd; /* >=0 if agent supports key */ |
| 265 | struct sshkey *key; /* public/private key */ |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 266 | char *filename; /* comment for agent-only keys */ |
| 267 | int tried; |
| 268 | int isprivate; /* key points to the private key */ |
Damien Miller | 5ceddc3 | 2013-02-15 12:18:32 +1100 | [diff] [blame] | 269 | int userprovided; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 270 | }; |
| 271 | TAILQ_HEAD(idlist, identity); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 272 | |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 273 | struct cauthctxt { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 274 | const char *server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 275 | const char *local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 276 | const char *host; |
| 277 | const char *service; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 278 | struct cauthmethod *method; |
Damien Miller | 79442c0 | 2010-05-10 11:55:38 +1000 | [diff] [blame] | 279 | sig_atomic_t success; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 280 | char *authlist; |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 281 | #ifdef GSSAPI |
| 282 | /* gssapi */ |
| 283 | gss_OID_set gss_supported_mechs; |
| 284 | u_int mech_tried; |
| 285 | #endif |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 286 | /* pubkey */ |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 287 | struct idlist keys; |
| 288 | int agent_fd; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 289 | /* hostbased */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 290 | Sensitive *sensitive; |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 291 | char *oktypes, *ktypes; |
| 292 | const char *active_ktype; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 293 | /* kbd-interactive */ |
| 294 | int info_req_seen; |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 295 | int attempt_kbdint; |
| 296 | /* password */ |
| 297 | int attempt_passwd; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 298 | /* generic */ |
| 299 | void *methoddata; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 300 | }; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 301 | |
| 302 | struct cauthmethod { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 303 | char *name; /* string to compare against server's list */ |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 304 | int (*userauth)(struct ssh *ssh); |
| 305 | void (*cleanup)(struct ssh *ssh); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 306 | int *enabled; /* flag in option struct that enables method */ |
| 307 | int *batch_flag; /* flag in option struct that disables method */ |
| 308 | }; |
| 309 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 310 | static int input_userauth_service_accept(int, u_int32_t, struct ssh *); |
| 311 | static int input_userauth_ext_info(int, u_int32_t, struct ssh *); |
| 312 | static int input_userauth_success(int, u_int32_t, struct ssh *); |
| 313 | static int input_userauth_failure(int, u_int32_t, struct ssh *); |
| 314 | static int input_userauth_banner(int, u_int32_t, struct ssh *); |
| 315 | static int input_userauth_error(int, u_int32_t, struct ssh *); |
| 316 | static int input_userauth_info_req(int, u_int32_t, struct ssh *); |
| 317 | static int input_userauth_pk_ok(int, u_int32_t, struct ssh *); |
| 318 | static int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 319 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 320 | static int userauth_none(struct ssh *); |
| 321 | static int userauth_pubkey(struct ssh *); |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 322 | static int userauth_passwd(struct ssh *); |
| 323 | static int userauth_kbdint(struct ssh *); |
| 324 | static int userauth_hostbased(struct ssh *); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 325 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 326 | #ifdef GSSAPI |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 327 | static int userauth_gssapi(struct ssh *); |
| 328 | static void userauth_gssapi_cleanup(struct ssh *); |
| 329 | static int input_gssapi_response(int type, u_int32_t, struct ssh *); |
| 330 | static int input_gssapi_token(int type, u_int32_t, struct ssh *); |
| 331 | static int input_gssapi_error(int, u_int32_t, struct ssh *); |
| 332 | static int input_gssapi_errtok(int, u_int32_t, struct ssh *); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 333 | #endif |
| 334 | |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 335 | void userauth(struct ssh *, char *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 336 | |
djm@openbsd.org | 38e83e4 | 2019-02-12 23:53:10 +0000 | [diff] [blame] | 337 | static void pubkey_cleanup(struct ssh *); |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 338 | static int sign_and_send_pubkey(struct ssh *ssh, Identity *); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 339 | static void pubkey_prepare(Authctxt *); |
djm@openbsd.org | b9844a4 | 2016-12-04 23:54:02 +0000 | [diff] [blame] | 340 | static void pubkey_reset(Authctxt *); |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 341 | static struct sshkey *load_identity_file(Identity *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 342 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 343 | static Authmethod *authmethod_get(char *authlist); |
| 344 | static Authmethod *authmethod_lookup(const char *name); |
| 345 | static char *authmethods_get(void); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 346 | |
| 347 | Authmethod authmethods[] = { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 348 | #ifdef GSSAPI |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 349 | {"gssapi-with-mic", |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 350 | userauth_gssapi, |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 351 | userauth_gssapi_cleanup, |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 352 | &options.gss_authentication, |
| 353 | NULL}, |
| 354 | #endif |
Ben Lindstrom | 1bfe291 | 2001-06-05 19:37:25 +0000 | [diff] [blame] | 355 | {"hostbased", |
| 356 | userauth_hostbased, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 357 | NULL, |
Ben Lindstrom | 1bfe291 | 2001-06-05 19:37:25 +0000 | [diff] [blame] | 358 | &options.hostbased_authentication, |
| 359 | NULL}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 360 | {"publickey", |
| 361 | userauth_pubkey, |
djm@openbsd.org | 38e83e4 | 2019-02-12 23:53:10 +0000 | [diff] [blame] | 362 | NULL, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 363 | &options.pubkey_authentication, |
| 364 | NULL}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 365 | {"keyboard-interactive", |
| 366 | userauth_kbdint, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 367 | NULL, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 368 | &options.kbd_interactive_authentication, |
| 369 | &options.batch_mode}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 370 | {"password", |
| 371 | userauth_passwd, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 372 | NULL, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 373 | &options.password_authentication, |
| 374 | &options.batch_mode}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 375 | {"none", |
| 376 | userauth_none, |
| 377 | NULL, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 378 | NULL, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 379 | NULL}, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 380 | {NULL, NULL, NULL, NULL, NULL} |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 381 | }; |
| 382 | |
| 383 | void |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 384 | ssh_userauth2(struct ssh *ssh, const char *local_user, |
| 385 | const char *server_user, char *host, Sensitive *sensitive) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 386 | { |
| 387 | Authctxt authctxt; |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 388 | int r; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 389 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 390 | if (options.challenge_response_authentication) |
Ben Lindstrom | 95fb2dd | 2001-01-23 03:12:10 +0000 | [diff] [blame] | 391 | options.kbd_interactive_authentication = 1; |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 392 | if (options.preferred_authentications == NULL) |
| 393 | options.preferred_authentications = authmethods_get(); |
| 394 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 395 | /* setup authentication context */ |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 396 | memset(&authctxt, 0, sizeof(authctxt)); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 397 | authctxt.server_user = server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 398 | authctxt.local_user = local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 399 | authctxt.host = host; |
| 400 | authctxt.service = "ssh-connection"; /* service name */ |
| 401 | authctxt.success = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 402 | authctxt.method = authmethod_lookup("none"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 403 | authctxt.authlist = NULL; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 404 | authctxt.methoddata = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 405 | authctxt.sensitive = sensitive; |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 406 | authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 407 | authctxt.info_req_seen = 0; |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 408 | authctxt.attempt_kbdint = 0; |
| 409 | authctxt.attempt_passwd = 0; |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 410 | #if GSSAPI |
| 411 | authctxt.gss_supported_mechs = NULL; |
| 412 | authctxt.mech_tried = 0; |
| 413 | #endif |
djm@openbsd.org | f14564c | 2015-01-15 11:04:36 +0000 | [diff] [blame] | 414 | authctxt.agent_fd = -1; |
djm@openbsd.org | aaed635 | 2018-11-16 02:46:20 +0000 | [diff] [blame] | 415 | pubkey_prepare(&authctxt); |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 416 | if (authctxt.method == NULL) { |
| 417 | fatal("%s: internal error: cannot send userauth none request", |
| 418 | __func__); |
| 419 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 420 | |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 421 | if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST)) != 0 || |
| 422 | (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 || |
| 423 | (r = sshpkt_send(ssh)) != 0) |
| 424 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 425 | |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 426 | ssh->authctxt = &authctxt; |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 427 | ssh_dispatch_init(ssh, &input_userauth_error); |
| 428 | ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_ext_info); |
| 429 | ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT, &input_userauth_service_accept); |
markus@openbsd.org | 92e9fe6 | 2017-05-31 07:00:13 +0000 | [diff] [blame] | 430 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */ |
djm@openbsd.org | 38e83e4 | 2019-02-12 23:53:10 +0000 | [diff] [blame] | 431 | pubkey_cleanup(ssh); |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 432 | ssh->authctxt = NULL; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 433 | |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 434 | ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 435 | |
dtucker@openbsd.org | f31c654 | 2016-09-22 02:29:57 +0000 | [diff] [blame] | 436 | if (!authctxt.success) |
| 437 | fatal("Authentication failed."); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 438 | debug("Authentication succeeded (%s).", authctxt.method->name); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 439 | } |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 440 | |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 441 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 442 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 443 | input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh) |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 444 | { |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 445 | int r; |
| 446 | |
| 447 | if (ssh_packet_remaining(ssh) > 0) { |
| 448 | char *reply; |
| 449 | |
| 450 | if ((r = sshpkt_get_cstring(ssh, &reply, NULL)) != 0) |
| 451 | goto out; |
| 452 | debug2("service_accept: %s", reply); |
| 453 | free(reply); |
| 454 | } else { |
| 455 | debug2("buggy server: service_accept w/o service"); |
| 456 | } |
| 457 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 458 | goto out; |
| 459 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
| 460 | |
| 461 | /* initial userauth request */ |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 462 | userauth_none(ssh); |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 463 | |
| 464 | ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_error); |
| 465 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
| 466 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); |
| 467 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
| 468 | r = 0; |
| 469 | out: |
| 470 | return r; |
| 471 | } |
| 472 | |
| 473 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 474 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 475 | input_userauth_ext_info(int type, u_int32_t seqnr, struct ssh *ssh) |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 476 | { |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 477 | return kex_input_ext_info(type, seqnr, ssh); |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 478 | } |
| 479 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 480 | void |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 481 | userauth(struct ssh *ssh, char *authlist) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 482 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 483 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 484 | |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 485 | if (authctxt->method != NULL && authctxt->method->cleanup != NULL) |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 486 | authctxt->method->cleanup(ssh); |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 487 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 488 | free(authctxt->methoddata); |
| 489 | authctxt->methoddata = NULL; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 490 | if (authlist == NULL) { |
| 491 | authlist = authctxt->authlist; |
| 492 | } else { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 493 | free(authctxt->authlist); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 494 | authctxt->authlist = authlist; |
| 495 | } |
| 496 | for (;;) { |
| 497 | Authmethod *method = authmethod_get(authlist); |
| 498 | if (method == NULL) |
dtucker@openbsd.org | 4626e39 | 2017-06-14 00:31:38 +0000 | [diff] [blame] | 499 | fatal("%s@%s: Permission denied (%s).", |
| 500 | authctxt->server_user, authctxt->host, authlist); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 501 | authctxt->method = method; |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 502 | |
| 503 | /* reset the per method handler */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 504 | ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN, |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 505 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); |
| 506 | |
| 507 | /* and try new method */ |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 508 | if (method->userauth(ssh) != 0) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 509 | debug2("we sent a %s packet, wait for reply", method->name); |
| 510 | break; |
| 511 | } else { |
| 512 | debug2("we did not send a packet, disable method"); |
| 513 | method->enabled = NULL; |
| 514 | } |
| 515 | } |
| 516 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 517 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 518 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 519 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 520 | input_userauth_error(int type, u_int32_t seq, struct ssh *ssh) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 521 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 522 | fatal("%s: bad message during authentication: type %d", __func__, type); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 523 | return 0; |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 524 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 525 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 526 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 527 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 528 | input_userauth_banner(int type, u_int32_t seq, struct ssh *ssh) |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 529 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 530 | char *msg = NULL; |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 531 | size_t len; |
| 532 | int r; |
Darren Tucker | 7964482 | 2003-10-08 17:37:58 +1000 | [diff] [blame] | 533 | |
djm@openbsd.org | 65c6c6b | 2016-07-17 04:20:16 +0000 | [diff] [blame] | 534 | debug3("%s", __func__); |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 535 | if ((r = sshpkt_get_cstring(ssh, &msg, &len)) != 0 || |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 536 | (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0) |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 537 | goto out; |
djm@openbsd.org | 65c6c6b | 2016-07-17 04:20:16 +0000 | [diff] [blame] | 538 | if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) |
| 539 | fmprintf(stderr, "%s", msg); |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 540 | r = 0; |
| 541 | out: |
djm@openbsd.org | 65c6c6b | 2016-07-17 04:20:16 +0000 | [diff] [blame] | 542 | free(msg); |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 543 | return r; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 544 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 545 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 546 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 547 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 548 | input_userauth_success(int type, u_int32_t seq, struct ssh *ssh) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 549 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 550 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 551 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 552 | if (authctxt == NULL) |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 553 | fatal("%s: no authentication context", __func__); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 554 | free(authctxt->authlist); |
| 555 | authctxt->authlist = NULL; |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 556 | if (authctxt->method != NULL && authctxt->method->cleanup != NULL) |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 557 | authctxt->method->cleanup(ssh); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 558 | free(authctxt->methoddata); |
| 559 | authctxt->methoddata = NULL; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 560 | authctxt->success = 1; /* break out */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 561 | return 0; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 562 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 563 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 564 | #if 0 |
| 565 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 566 | input_userauth_success_unexpected(int type, u_int32_t seq, struct ssh *ssh) |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 567 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 568 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 569 | |
| 570 | if (authctxt == NULL) |
| 571 | fatal("%s: no authentication context", __func__); |
| 572 | |
| 573 | fatal("Unexpected authentication success during %s.", |
| 574 | authctxt->method->name); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 575 | return 0; |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 576 | } |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 577 | #endif |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 578 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 579 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 580 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 581 | input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 582 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 583 | Authctxt *authctxt = ssh->authctxt; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 584 | char *authlist = NULL; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 585 | u_char partial; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 586 | |
| 587 | if (authctxt == NULL) |
| 588 | fatal("input_userauth_failure: no authentication context"); |
| 589 | |
dtucker@openbsd.org | 696fb42 | 2019-07-07 01:05:00 +0000 | [diff] [blame] | 590 | if (sshpkt_get_cstring(ssh, &authlist, NULL) != 0 || |
| 591 | sshpkt_get_u8(ssh, &partial) != 0 || |
| 592 | sshpkt_get_end(ssh) != 0) |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 593 | goto out; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 594 | |
Damien Miller | 62e9c4f | 2013-04-23 15:15:49 +1000 | [diff] [blame] | 595 | if (partial != 0) { |
dtucker@openbsd.org | 83cbca6 | 2016-07-22 05:46:11 +0000 | [diff] [blame] | 596 | verbose("Authenticated with partial success."); |
Damien Miller | 62e9c4f | 2013-04-23 15:15:49 +1000 | [diff] [blame] | 597 | /* reset state */ |
djm@openbsd.org | b9844a4 | 2016-12-04 23:54:02 +0000 | [diff] [blame] | 598 | pubkey_reset(authctxt); |
Damien Miller | 62e9c4f | 2013-04-23 15:15:49 +1000 | [diff] [blame] | 599 | } |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 600 | debug("Authentications that can continue: %s", authlist); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 601 | |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 602 | userauth(ssh, authlist); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 603 | authlist = NULL; |
| 604 | out: |
| 605 | free(authlist); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 606 | return 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 607 | } |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 608 | |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 609 | /* |
| 610 | * Format an identity for logging including filename, key type, fingerprint |
| 611 | * and location (agent, etc.). Caller must free. |
| 612 | */ |
| 613 | static char * |
| 614 | format_identity(Identity *id) |
| 615 | { |
| 616 | char *fp = NULL, *ret = NULL; |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 617 | const char *note = ""; |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 618 | |
| 619 | if (id->key != NULL) { |
| 620 | fp = sshkey_fingerprint(id->key, options.fingerprint_hash, |
| 621 | SSH_FP_DEFAULT); |
| 622 | } |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 623 | if (id->key) { |
| 624 | if ((id->key->flags & SSHKEY_FLAG_EXT) != 0) |
| 625 | note = " token"; |
markus@openbsd.org | 2c55744 | 2019-11-12 19:33:08 +0000 | [diff] [blame] | 626 | else if (sshkey_is_sk(id->key)) |
naddy@openbsd.org | a47f6a6 | 2020-02-06 22:30:54 +0000 | [diff] [blame] | 627 | note = " authenticator"; |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 628 | } |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 629 | xasprintf(&ret, "%s %s%s%s%s%s%s", |
| 630 | id->filename, |
| 631 | id->key ? sshkey_type(id->key) : "", id->key ? " " : "", |
| 632 | fp ? fp : "", |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 633 | id->userprovided ? " explicit" : "", note, |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 634 | id->agent_fd != -1 ? " agent" : ""); |
| 635 | free(fp); |
| 636 | return ret; |
| 637 | } |
| 638 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 639 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 640 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 641 | input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 642 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 643 | Authctxt *authctxt = ssh->authctxt; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 644 | struct sshkey *key = NULL; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 645 | Identity *id = NULL; |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 646 | int pktype, found = 0, sent = 0; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 647 | size_t blen; |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 648 | char *pkalg = NULL, *fp = NULL, *ident = NULL; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 649 | u_char *pkblob = NULL; |
| 650 | int r; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 651 | |
| 652 | if (authctxt == NULL) |
| 653 | fatal("input_userauth_pk_ok: no authentication context"); |
djm@openbsd.org | 14b5c63 | 2018-01-23 05:27:21 +0000 | [diff] [blame] | 654 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 655 | if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 || |
| 656 | (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 || |
| 657 | (r = sshpkt_get_end(ssh)) != 0) |
| 658 | goto done; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 659 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 660 | if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) { |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 661 | debug("%s: server sent unknown pkalg %s", __func__, pkalg); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 662 | goto done; |
| 663 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 664 | if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) { |
| 665 | debug("no key from blob. pkalg %s: %s", pkalg, ssh_err(r)); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 666 | goto done; |
| 667 | } |
| 668 | if (key->type != pktype) { |
| 669 | error("input_userauth_pk_ok: type mismatch " |
| 670 | "for decoded key (received %d, expected %d)", |
| 671 | key->type, pktype); |
| 672 | goto done; |
| 673 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 674 | |
Darren Tucker | d05b601 | 2003-10-15 15:55:59 +1000 | [diff] [blame] | 675 | /* |
| 676 | * search keys in the reverse order, because last candidate has been |
| 677 | * moved to the end of the queue. this also avoids confusion by |
| 678 | * duplicate keys |
| 679 | */ |
Damien Miller | 0b51a52 | 2004-04-20 20:07:19 +1000 | [diff] [blame] | 680 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 681 | if (sshkey_equal(key, id->key)) { |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 682 | found = 1; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 683 | break; |
| 684 | } |
| 685 | } |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 686 | if (!found || id == NULL) { |
| 687 | fp = sshkey_fingerprint(key, options.fingerprint_hash, |
| 688 | SSH_FP_DEFAULT); |
| 689 | error("%s: server replied with unknown key: %s %s", __func__, |
| 690 | sshkey_type(key), fp == NULL ? "<ERROR>" : fp); |
| 691 | goto done; |
| 692 | } |
| 693 | ident = format_identity(id); |
| 694 | debug("Server accepts key: %s", ident); |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 695 | sent = sign_and_send_pubkey(ssh, id); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 696 | r = 0; |
| 697 | done: |
| 698 | sshkey_free(key); |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 699 | free(ident); |
| 700 | free(fp); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 701 | free(pkalg); |
| 702 | free(pkblob); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 703 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 704 | /* try another method if we did not send a packet */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 705 | if (r == 0 && sent == 0) |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 706 | userauth(ssh, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 707 | return r; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 708 | } |
| 709 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 710 | #ifdef GSSAPI |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 711 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 712 | userauth_gssapi(struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 713 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 714 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 715 | Gssctxt *gssctxt = NULL; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 716 | OM_uint32 min; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 717 | int r, ok = 0; |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 718 | gss_OID mech = NULL; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 719 | |
| 720 | /* Try one GSSAPI method at a time, rather than sending them all at |
| 721 | * once. */ |
| 722 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 723 | if (authctxt->gss_supported_mechs == NULL) |
| 724 | gss_indicate_mechs(&min, &authctxt->gss_supported_mechs); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 725 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 726 | /* Check to see whether the mechanism is usable before we offer it */ |
| 727 | while (authctxt->mech_tried < authctxt->gss_supported_mechs->count && |
| 728 | !ok) { |
| 729 | mech = &authctxt->gss_supported_mechs-> |
| 730 | elements[authctxt->mech_tried]; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 731 | /* My DER encoding requires length<128 */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 732 | if (mech->length < 128 && ssh_gssapi_check_mechanism(&gssctxt, |
| 733 | mech, authctxt->host)) { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 734 | ok = 1; /* Mechanism works */ |
| 735 | } else { |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 736 | authctxt->mech_tried++; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 737 | } |
| 738 | } |
| 739 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 740 | if (!ok || mech == NULL) |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 741 | return 0; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 742 | |
| 743 | authctxt->methoddata=(void *)gssctxt; |
| 744 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 745 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 746 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 747 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 748 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 749 | (r = sshpkt_put_u32(ssh, 1)) != 0 || |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 750 | (r = sshpkt_put_u32(ssh, (mech->length) + 2)) != 0 || |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 751 | (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 || |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 752 | (r = sshpkt_put_u8(ssh, mech->length)) != 0 || |
| 753 | (r = sshpkt_put(ssh, mech->elements, mech->length)) != 0 || |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 754 | (r = sshpkt_send(ssh)) != 0) |
| 755 | fatal("%s: %s", __func__, ssh_err(r)); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 756 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 757 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); |
| 758 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); |
| 759 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); |
| 760 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 761 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 762 | authctxt->mech_tried++; /* Move along to next candidate */ |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 763 | |
| 764 | return 1; |
| 765 | } |
| 766 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 767 | static void |
| 768 | userauth_gssapi_cleanup(struct ssh *ssh) |
| 769 | { |
| 770 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 771 | Gssctxt *gssctxt = (Gssctxt *)authctxt->methoddata; |
| 772 | |
| 773 | ssh_gssapi_delete_ctx(&gssctxt); |
| 774 | authctxt->methoddata = NULL; |
| 775 | |
| 776 | free(authctxt->gss_supported_mechs); |
| 777 | authctxt->gss_supported_mechs = NULL; |
| 778 | } |
| 779 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 780 | static OM_uint32 |
djm@openbsd.org | 39896b7 | 2017-05-31 05:08:46 +0000 | [diff] [blame] | 781 | process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok) |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 782 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 783 | Authctxt *authctxt = ssh->authctxt; |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 784 | Gssctxt *gssctxt = authctxt->methoddata; |
| 785 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
Damien Miller | da9984f | 2005-08-31 19:46:26 +1000 | [diff] [blame] | 786 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
| 787 | gss_buffer_desc gssbuf; |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 788 | OM_uint32 status, ms, flags; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 789 | int r; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 790 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 791 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 792 | recv_tok, &send_tok, &flags); |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 793 | |
| 794 | if (send_tok.length > 0) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 795 | u_char type = GSS_ERROR(status) ? |
| 796 | SSH2_MSG_USERAUTH_GSSAPI_ERRTOK : |
| 797 | SSH2_MSG_USERAUTH_GSSAPI_TOKEN; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 798 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 799 | if ((r = sshpkt_start(ssh, type)) != 0 || |
| 800 | (r = sshpkt_put_string(ssh, send_tok.value, |
| 801 | send_tok.length)) != 0 || |
| 802 | (r = sshpkt_send(ssh)) != 0) |
| 803 | fatal("%s: %s", __func__, ssh_err(r)); |
| 804 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 805 | gss_release_buffer(&ms, &send_tok); |
| 806 | } |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 807 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 808 | if (status == GSS_S_COMPLETE) { |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 809 | /* send either complete or MIC, depending on mechanism */ |
| 810 | if (!(flags & GSS_C_INTEG_FLAG)) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 811 | if ((r = sshpkt_start(ssh, |
| 812 | SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 || |
| 813 | (r = sshpkt_send(ssh)) != 0) |
| 814 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 815 | } else { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 816 | struct sshbuf *b; |
| 817 | |
| 818 | if ((b = sshbuf_new()) == NULL) |
| 819 | fatal("%s: sshbuf_new failed", __func__); |
| 820 | ssh_gssapi_buildmic(b, authctxt->server_user, |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 821 | authctxt->service, "gssapi-with-mic"); |
| 822 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 823 | if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL) |
| 824 | fatal("%s: sshbuf_mutable_ptr failed", __func__); |
| 825 | gssbuf.length = sshbuf_len(b); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 826 | |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 827 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 828 | |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 829 | if (!GSS_ERROR(status)) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 830 | if ((r = sshpkt_start(ssh, |
| 831 | SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 || |
| 832 | (r = sshpkt_put_string(ssh, mic.value, |
| 833 | mic.length)) != 0 || |
| 834 | (r = sshpkt_send(ssh)) != 0) |
| 835 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 836 | } |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 837 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 838 | sshbuf_free(b); |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 839 | gss_release_buffer(&ms, &mic); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 840 | } |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 841 | } |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 842 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 843 | return status; |
| 844 | } |
| 845 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 846 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 847 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 848 | input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 849 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 850 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 851 | Gssctxt *gssctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 852 | size_t oidlen; |
| 853 | u_char *oidv = NULL; |
| 854 | int r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 855 | |
| 856 | if (authctxt == NULL) |
| 857 | fatal("input_gssapi_response: no authentication context"); |
| 858 | gssctxt = authctxt->methoddata; |
| 859 | |
| 860 | /* Setup our OID */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 861 | if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0) |
| 862 | goto done; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 863 | |
Darren Tucker | 655a5e0 | 2003-11-03 20:09:03 +1100 | [diff] [blame] | 864 | if (oidlen <= 2 || |
| 865 | oidv[0] != SSH_GSS_OIDTYPE || |
| 866 | oidv[1] != oidlen - 2) { |
| 867 | debug("Badly encoded mechanism OID received"); |
djm@openbsd.org | 0a5f2ea | 2019-01-21 01:05:00 +0000 | [diff] [blame] | 868 | userauth(ssh, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 869 | goto ok; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 870 | } |
| 871 | |
Darren Tucker | 655a5e0 | 2003-11-03 20:09:03 +1100 | [diff] [blame] | 872 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
| 873 | fatal("Server returned different OID than expected"); |
| 874 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 875 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 876 | goto done; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 877 | |
djm@openbsd.org | 39896b7 | 2017-05-31 05:08:46 +0000 | [diff] [blame] | 878 | if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 879 | /* Start again with next method on list */ |
| 880 | debug("Trying to start again"); |
djm@openbsd.org | 0a5f2ea | 2019-01-21 01:05:00 +0000 | [diff] [blame] | 881 | userauth(ssh, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 882 | goto ok; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 883 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 884 | ok: |
| 885 | r = 0; |
| 886 | done: |
| 887 | free(oidv); |
| 888 | return r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 889 | } |
| 890 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 891 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 892 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 893 | input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 894 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 895 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 896 | gss_buffer_desc recv_tok; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 897 | u_char *p = NULL; |
| 898 | size_t len; |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 899 | OM_uint32 status; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 900 | int r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 901 | |
| 902 | if (authctxt == NULL) |
| 903 | fatal("input_gssapi_response: no authentication context"); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 904 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 905 | if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 || |
| 906 | (r = sshpkt_get_end(ssh)) != 0) |
| 907 | goto out; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 908 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 909 | recv_tok.value = p; |
| 910 | recv_tok.length = len; |
djm@openbsd.org | 39896b7 | 2017-05-31 05:08:46 +0000 | [diff] [blame] | 911 | status = process_gssapi_token(ssh, &recv_tok); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 912 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 913 | /* Start again with the next method in the list */ |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 914 | if (GSS_ERROR(status)) { |
djm@openbsd.org | 0a5f2ea | 2019-01-21 01:05:00 +0000 | [diff] [blame] | 915 | userauth(ssh, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 916 | /* ok */ |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 917 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 918 | r = 0; |
| 919 | out: |
| 920 | free(p); |
| 921 | return r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 922 | } |
| 923 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 924 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 925 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 926 | input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 927 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 928 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 929 | Gssctxt *gssctxt; |
| 930 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 931 | gss_buffer_desc recv_tok; |
Damien Miller | d677ad1 | 2013-04-23 15:18:51 +1000 | [diff] [blame] | 932 | OM_uint32 ms; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 933 | u_char *p = NULL; |
| 934 | size_t len; |
| 935 | int r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 936 | |
| 937 | if (authctxt == NULL) |
| 938 | fatal("input_gssapi_response: no authentication context"); |
| 939 | gssctxt = authctxt->methoddata; |
| 940 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 941 | if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 || |
| 942 | (r = sshpkt_get_end(ssh)) != 0) { |
| 943 | free(p); |
| 944 | return r; |
| 945 | } |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 946 | |
| 947 | /* Stick it into GSSAPI and see what it says */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 948 | recv_tok.value = p; |
| 949 | recv_tok.length = len; |
Damien Miller | d677ad1 | 2013-04-23 15:18:51 +1000 | [diff] [blame] | 950 | (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 951 | &recv_tok, &send_tok, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 952 | free(p); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 953 | gss_release_buffer(&ms, &send_tok); |
| 954 | |
| 955 | /* Server will be returning a failed packet after this one */ |
djm@openbsd.org | 12b5f50 | 2015-01-20 07:56:44 +0000 | [diff] [blame] | 956 | return 0; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 957 | } |
| 958 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 959 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 960 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 961 | input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 962 | { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 963 | char *msg = NULL; |
| 964 | char *lang = NULL; |
| 965 | int r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 966 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 967 | if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* maj */ |
| 968 | (r = sshpkt_get_u32(ssh, NULL)) != 0 || /* min */ |
| 969 | (r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 || |
| 970 | (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0) |
| 971 | goto out; |
| 972 | r = sshpkt_get_end(ssh); |
Damien Miller | 15d72a0 | 2005-11-05 15:07:33 +1100 | [diff] [blame] | 973 | debug("Server GSSAPI Error:\n%s", msg); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 974 | out: |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 975 | free(msg); |
| 976 | free(lang); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 977 | return r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 978 | } |
| 979 | #endif /* GSSAPI */ |
| 980 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 981 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 982 | userauth_none(struct ssh *ssh) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 983 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 984 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 985 | int r; |
| 986 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 987 | /* initial userauth request */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 988 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 989 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 990 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 991 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 992 | (r = sshpkt_send(ssh)) != 0) |
| 993 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 994 | return 1; |
| 995 | } |
| 996 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 997 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 998 | userauth_passwd(struct ssh *ssh) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 999 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1000 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
djm@openbsd.org | 91b1919 | 2018-11-28 06:00:38 +0000 | [diff] [blame] | 1001 | char *password, *prompt = NULL; |
Darren Tucker | ab79169 | 2010-01-08 18:48:02 +1100 | [diff] [blame] | 1002 | const char *host = options.host_key_alias ? options.host_key_alias : |
| 1003 | authctxt->host; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1004 | int r; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1005 | |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 1006 | if (authctxt->attempt_passwd++ >= options.number_of_password_prompts) |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1007 | return 0; |
| 1008 | |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 1009 | if (authctxt->attempt_passwd != 1) |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 1010 | error("Permission denied, please try again."); |
| 1011 | |
djm@openbsd.org | 91b1919 | 2018-11-28 06:00:38 +0000 | [diff] [blame] | 1012 | xasprintf(&prompt, "%s@%s's password: ", authctxt->server_user, host); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1013 | password = read_passphrase(prompt, 0); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1014 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1015 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1016 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1017 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1018 | (r = sshpkt_put_u8(ssh, 0)) != 0 || |
| 1019 | (r = sshpkt_put_cstring(ssh, password)) != 0 || |
| 1020 | (r = sshpkt_add_padding(ssh, 64)) != 0 || |
| 1021 | (r = sshpkt_send(ssh)) != 0) |
| 1022 | fatal("%s: %s", __func__, ssh_err(r)); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1023 | |
djm@openbsd.org | 91b1919 | 2018-11-28 06:00:38 +0000 | [diff] [blame] | 1024 | free(prompt); |
| 1025 | if (password != NULL) |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1026 | freezero(password, strlen(password)); |
| 1027 | |
| 1028 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1029 | &input_userauth_passwd_changereq); |
| 1030 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1031 | return 1; |
| 1032 | } |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 1033 | |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1034 | /* |
| 1035 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST |
| 1036 | */ |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 1037 | /* ARGSUSED */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 1038 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 1039 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, struct ssh *ssh) |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1040 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 1041 | Authctxt *authctxt = ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1042 | char *info = NULL, *lang = NULL, *password = NULL, *retype = NULL; |
dtucker@openbsd.org | a54eb27 | 2017-08-27 00:38:41 +0000 | [diff] [blame] | 1043 | char prompt[256]; |
djm@openbsd.org | 3e032a9 | 2017-01-30 00:32:03 +0000 | [diff] [blame] | 1044 | const char *host; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1045 | int r; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1046 | |
| 1047 | debug2("input_userauth_passwd_changereq"); |
| 1048 | |
| 1049 | if (authctxt == NULL) |
| 1050 | fatal("input_userauth_passwd_changereq: " |
| 1051 | "no authentication context"); |
djm@openbsd.org | 3e032a9 | 2017-01-30 00:32:03 +0000 | [diff] [blame] | 1052 | host = options.host_key_alias ? options.host_key_alias : authctxt->host; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1053 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1054 | if ((r = sshpkt_get_cstring(ssh, &info, NULL)) != 0 || |
| 1055 | (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0) |
| 1056 | goto out; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1057 | if (strlen(info) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1058 | logit("%s", info); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1059 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1060 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1061 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1062 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1063 | (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */ |
| 1064 | goto out; |
| 1065 | |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 1066 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1067 | "Enter %.30s@%.128s's old password: ", |
Darren Tucker | ab79169 | 2010-01-08 18:48:02 +1100 | [diff] [blame] | 1068 | authctxt->server_user, host); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1069 | password = read_passphrase(prompt, 0); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1070 | if ((r = sshpkt_put_cstring(ssh, password)) != 0) |
| 1071 | goto out; |
| 1072 | |
| 1073 | freezero(password, strlen(password)); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1074 | password = NULL; |
| 1075 | while (password == NULL) { |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 1076 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1077 | "Enter %.30s@%.128s's new password: ", |
Darren Tucker | ab79169 | 2010-01-08 18:48:02 +1100 | [diff] [blame] | 1078 | authctxt->server_user, host); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1079 | password = read_passphrase(prompt, RP_ALLOW_EOF); |
| 1080 | if (password == NULL) { |
| 1081 | /* bail out */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1082 | r = 0; |
| 1083 | goto out; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1084 | } |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 1085 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1086 | "Retype %.30s@%.128s's new password: ", |
Darren Tucker | ab79169 | 2010-01-08 18:48:02 +1100 | [diff] [blame] | 1087 | authctxt->server_user, host); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1088 | retype = read_passphrase(prompt, 0); |
| 1089 | if (strcmp(password, retype) != 0) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1090 | freezero(password, strlen(password)); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1091 | logit("Mismatch; try again, EOF to quit."); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1092 | password = NULL; |
| 1093 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1094 | freezero(retype, strlen(retype)); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1095 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1096 | if ((r = sshpkt_put_cstring(ssh, password)) != 0 || |
| 1097 | (r = sshpkt_add_padding(ssh, 64)) != 0 || |
| 1098 | (r = sshpkt_send(ssh)) != 0) |
| 1099 | goto out; |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 1100 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1101 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1102 | &input_userauth_passwd_changereq); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1103 | r = 0; |
| 1104 | out: |
| 1105 | if (password) |
| 1106 | freezero(password, strlen(password)); |
| 1107 | free(info); |
| 1108 | free(lang); |
| 1109 | return r; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1110 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1111 | |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1112 | /* |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1113 | * Select an algorithm for publickey signatures. |
| 1114 | * Returns algorithm (caller must free) or NULL if no mutual algorithm found. |
| 1115 | * |
| 1116 | * Call with ssh==NULL to ignore server-sig-algs extension list and |
| 1117 | * only attempt with the key's base signature type. |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1118 | */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1119 | static char * |
| 1120 | key_sig_algorithm(struct ssh *ssh, const struct sshkey *key) |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1121 | { |
djm@openbsd.org | b4d4eda | 2018-07-03 13:20:25 +0000 | [diff] [blame] | 1122 | char *allowed, *oallowed, *cp, *tmp, *alg = NULL; |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1123 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1124 | /* |
| 1125 | * The signature algorithm will only differ from the key algorithm |
| 1126 | * for RSA keys/certs and when the server advertises support for |
| 1127 | * newer (SHA2) algorithms. |
| 1128 | */ |
| 1129 | if (ssh == NULL || ssh->kex->server_sig_algs == NULL || |
djm@openbsd.org | 1a4a9cf | 2018-10-11 03:48:04 +0000 | [diff] [blame] | 1130 | (key->type != KEY_RSA && key->type != KEY_RSA_CERT) || |
| 1131 | (key->type == KEY_RSA_CERT && (datafellows & SSH_BUG_SIGTYPE))) { |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1132 | /* Filter base key signature alg against our configuration */ |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1133 | return match_list(sshkey_ssh_name(key), |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1134 | options.pubkey_key_types, NULL); |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1135 | } |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1136 | |
| 1137 | /* |
| 1138 | * For RSA keys/certs, since these might have a different sig type: |
| 1139 | * find the first entry in PubkeyAcceptedKeyTypes of the right type |
| 1140 | * that also appears in the supported signature algorithms list from |
| 1141 | * the server. |
| 1142 | */ |
| 1143 | oallowed = allowed = xstrdup(options.pubkey_key_types); |
| 1144 | while ((cp = strsep(&allowed, ",")) != NULL) { |
| 1145 | if (sshkey_type_from_name(cp) != key->type) |
| 1146 | continue; |
djm@openbsd.org | b4d4eda | 2018-07-03 13:20:25 +0000 | [diff] [blame] | 1147 | tmp = match_list(sshkey_sigalg_by_name(cp), ssh->kex->server_sig_algs, NULL); |
| 1148 | if (tmp != NULL) |
| 1149 | alg = xstrdup(cp); |
| 1150 | free(tmp); |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1151 | if (alg != NULL) |
| 1152 | break; |
| 1153 | } |
| 1154 | free(oallowed); |
| 1155 | return alg; |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1156 | } |
| 1157 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1158 | static int |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1159 | identity_sign(struct identity *id, u_char **sigp, size_t *lenp, |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1160 | const u_char *data, size_t datalen, u_int compat, const char *alg) |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1161 | { |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1162 | struct sshkey *sign_key = NULL, *prv = NULL; |
| 1163 | int r = SSH_ERR_INTERNAL_ERROR; |
djm@openbsd.org | e44bb61 | 2019-11-12 22:36:44 +0000 | [diff] [blame] | 1164 | struct notifier_ctx *notifier = NULL; |
| 1165 | char *fp = NULL; |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1166 | |
| 1167 | *sigp = NULL; |
| 1168 | *lenp = 0; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1169 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1170 | /* The agent supports this key. */ |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1171 | if (id->key != NULL && id->agent_fd != -1) { |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1172 | return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp, |
| 1173 | data, datalen, alg, compat); |
| 1174 | } |
| 1175 | |
| 1176 | /* |
| 1177 | * We have already loaded the private key or the private key is |
| 1178 | * stored in external hardware. |
| 1179 | */ |
| 1180 | if (id->key != NULL && |
| 1181 | (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))) { |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1182 | sign_key = id->key; |
| 1183 | } else { |
| 1184 | /* Load the private key from the file. */ |
| 1185 | if ((prv = load_identity_file(id)) == NULL) |
| 1186 | return SSH_ERR_KEY_NOT_FOUND; |
| 1187 | if (id->key != NULL && !sshkey_equal_public(prv, id->key)) { |
| 1188 | error("%s: private key %s contents do not match public", |
| 1189 | __func__, id->filename); |
| 1190 | r = SSH_ERR_KEY_NOT_FOUND; |
| 1191 | goto out; |
| 1192 | } |
| 1193 | sign_key = prv; |
djm@openbsd.org | e44bb61 | 2019-11-12 22:36:44 +0000 | [diff] [blame] | 1194 | if (sshkey_is_sk(sign_key) && |
| 1195 | (sign_key->sk_flags & SSH_SK_USER_PRESENCE_REQD)) { |
| 1196 | /* XXX match batch mode should just skip these keys? */ |
| 1197 | if ((fp = sshkey_fingerprint(sign_key, |
| 1198 | options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL) |
| 1199 | fatal("%s: sshkey_fingerprint", __func__); |
| 1200 | notifier = notify_start(options.batch_mode, |
| 1201 | "Confirm user presence for key %s %s", |
| 1202 | sshkey_type(sign_key), fp); |
| 1203 | free(fp); |
| 1204 | } |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1205 | } |
djm@openbsd.org | 9a14c64 | 2019-10-31 21:23:19 +0000 | [diff] [blame] | 1206 | if ((r = sshkey_sign(sign_key, sigp, lenp, data, datalen, |
| 1207 | alg, options.sk_provider, compat)) != 0) { |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1208 | debug("%s: sshkey_sign: %s", __func__, ssh_err(r)); |
| 1209 | goto out; |
djm@openbsd.org | c4972d0 | 2017-08-11 04:47:12 +0000 | [diff] [blame] | 1210 | } |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1211 | /* |
| 1212 | * PKCS#11 tokens may not support all signature algorithms, |
| 1213 | * so check what we get back. |
| 1214 | */ |
| 1215 | if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0) { |
| 1216 | debug("%s: sshkey_check_sigtype: %s", __func__, ssh_err(r)); |
| 1217 | goto out; |
| 1218 | } |
| 1219 | /* success */ |
| 1220 | r = 0; |
| 1221 | out: |
djm@openbsd.org | 49dc9fa | 2019-11-15 02:37:24 +0000 | [diff] [blame] | 1222 | notify_complete(notifier); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1223 | sshkey_free(prv); |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1224 | return r; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1225 | } |
| 1226 | |
| 1227 | static int |
djm@openbsd.org | 1e24552 | 2017-03-11 23:40:26 +0000 | [diff] [blame] | 1228 | id_filename_matches(Identity *id, Identity *private_id) |
| 1229 | { |
| 1230 | const char *suffixes[] = { ".pub", "-cert.pub", NULL }; |
| 1231 | size_t len = strlen(id->filename), plen = strlen(private_id->filename); |
| 1232 | size_t i, slen; |
| 1233 | |
| 1234 | if (strcmp(id->filename, private_id->filename) == 0) |
| 1235 | return 1; |
| 1236 | for (i = 0; suffixes[i]; i++) { |
| 1237 | slen = strlen(suffixes[i]); |
| 1238 | if (len > slen && plen == len - slen && |
| 1239 | strcmp(id->filename + (len - slen), suffixes[i]) == 0 && |
| 1240 | memcmp(id->filename, private_id->filename, plen) == 0) |
| 1241 | return 1; |
| 1242 | } |
| 1243 | return 0; |
| 1244 | } |
| 1245 | |
| 1246 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1247 | sign_and_send_pubkey(struct ssh *ssh, Identity *id) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1248 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1249 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1250 | struct sshbuf *b = NULL; |
| 1251 | Identity *private_id, *sign_id = NULL; |
| 1252 | u_char *signature = NULL; |
| 1253 | size_t slen = 0, skip = 0; |
| 1254 | int r, fallback_sigtype, sent = 0; |
| 1255 | char *alg = NULL, *fp = NULL; |
| 1256 | const char *loc = ""; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1257 | |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 1258 | if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash, |
| 1259 | SSH_FP_DEFAULT)) == NULL) |
| 1260 | return 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1261 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1262 | debug3("%s: %s %s", __func__, sshkey_type(id->key), fp); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1263 | |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1264 | /* |
| 1265 | * If the key is an certificate, try to find a matching private key |
| 1266 | * and use it to complete the signature. |
djm@openbsd.org | 9ee692f | 2016-04-28 14:30:21 +0000 | [diff] [blame] | 1267 | * If no such private key exists, fall back to trying the certificate |
| 1268 | * key itself in case it has a private half already loaded. |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1269 | * This will try to set sign_id to the private key that will perform |
| 1270 | * the signature. |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1271 | */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1272 | if (sshkey_is_cert(id->key)) { |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1273 | TAILQ_FOREACH(private_id, &authctxt->keys, next) { |
| 1274 | if (sshkey_equal_public(id->key, private_id->key) && |
| 1275 | id->key->type != private_id->key->type) { |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1276 | sign_id = private_id; |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1277 | break; |
| 1278 | } |
| 1279 | } |
djm@openbsd.org | 1e24552 | 2017-03-11 23:40:26 +0000 | [diff] [blame] | 1280 | /* |
| 1281 | * Exact key matches are preferred, but also allow |
| 1282 | * filename matches for non-PKCS#11/agent keys that |
| 1283 | * didn't load public keys. This supports the case |
| 1284 | * of keeping just a private key file and public |
| 1285 | * certificate on disk. |
| 1286 | */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1287 | if (sign_id == NULL && |
| 1288 | !id->isprivate && id->agent_fd == -1 && |
djm@openbsd.org | 1e24552 | 2017-03-11 23:40:26 +0000 | [diff] [blame] | 1289 | (id->key->flags & SSHKEY_FLAG_EXT) == 0) { |
| 1290 | TAILQ_FOREACH(private_id, &authctxt->keys, next) { |
| 1291 | if (private_id->key == NULL && |
| 1292 | id_filename_matches(id, private_id)) { |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1293 | sign_id = private_id; |
djm@openbsd.org | 1e24552 | 2017-03-11 23:40:26 +0000 | [diff] [blame] | 1294 | break; |
| 1295 | } |
| 1296 | } |
| 1297 | } |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1298 | if (sign_id != NULL) { |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1299 | debug2("%s: using private key \"%s\"%s for " |
| 1300 | "certificate", __func__, id->filename, |
| 1301 | id->agent_fd != -1 ? " from agent" : ""); |
| 1302 | } else { |
djm@openbsd.org | c38905b | 2016-03-14 16:20:54 +0000 | [diff] [blame] | 1303 | debug("%s: no separate private key for certificate " |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1304 | "\"%s\"", __func__, id->filename); |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1305 | } |
| 1306 | } |
| 1307 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1308 | /* |
| 1309 | * If the above didn't select another identity to do the signing |
| 1310 | * then default to the one we started with. |
| 1311 | */ |
| 1312 | if (sign_id == NULL) |
| 1313 | sign_id = id; |
| 1314 | |
| 1315 | /* assemble and sign data */ |
| 1316 | for (fallback_sigtype = 0; fallback_sigtype <= 1; fallback_sigtype++) { |
| 1317 | free(alg); |
| 1318 | slen = 0; |
| 1319 | signature = NULL; |
| 1320 | if ((alg = key_sig_algorithm(fallback_sigtype ? NULL : ssh, |
| 1321 | id->key)) == NULL) { |
| 1322 | error("%s: no mutual signature supported", __func__); |
| 1323 | goto out; |
| 1324 | } |
djm@openbsd.org | 881aded | 2020-01-21 05:56:27 +0000 | [diff] [blame] | 1325 | debug3("%s: signing using %s %s", __func__, alg, fp); |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1326 | |
| 1327 | sshbuf_free(b); |
| 1328 | if ((b = sshbuf_new()) == NULL) |
| 1329 | fatal("%s: sshbuf_new failed", __func__); |
| 1330 | if (datafellows & SSH_OLD_SESSIONID) { |
| 1331 | if ((r = sshbuf_put(b, session_id2, |
| 1332 | session_id2_len)) != 0) { |
| 1333 | fatal("%s: sshbuf_put: %s", |
| 1334 | __func__, ssh_err(r)); |
| 1335 | } |
| 1336 | } else { |
| 1337 | if ((r = sshbuf_put_string(b, session_id2, |
| 1338 | session_id2_len)) != 0) { |
| 1339 | fatal("%s: sshbuf_put_string: %s", |
| 1340 | __func__, ssh_err(r)); |
| 1341 | } |
| 1342 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1343 | skip = sshbuf_len(b); |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1344 | if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1345 | (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 || |
| 1346 | (r = sshbuf_put_cstring(b, authctxt->service)) != 0 || |
| 1347 | (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 || |
| 1348 | (r = sshbuf_put_u8(b, 1)) != 0 || |
| 1349 | (r = sshbuf_put_cstring(b, alg)) != 0 || |
| 1350 | (r = sshkey_puts(id->key, b)) != 0) { |
| 1351 | fatal("%s: assemble signed data: %s", |
| 1352 | __func__, ssh_err(r)); |
| 1353 | } |
| 1354 | |
| 1355 | /* generate signature */ |
| 1356 | r = identity_sign(sign_id, &signature, &slen, |
| 1357 | sshbuf_ptr(b), sshbuf_len(b), datafellows, alg); |
| 1358 | if (r == 0) |
| 1359 | break; |
| 1360 | else if (r == SSH_ERR_KEY_NOT_FOUND) |
| 1361 | goto out; /* soft failure */ |
| 1362 | else if (r == SSH_ERR_SIGN_ALG_UNSUPPORTED && |
| 1363 | !fallback_sigtype) { |
| 1364 | if (sign_id->agent_fd != -1) |
| 1365 | loc = "agent "; |
| 1366 | else if ((sign_id->key->flags & SSHKEY_FLAG_EXT) != 0) |
| 1367 | loc = "token "; |
| 1368 | logit("%skey %s %s returned incorrect signature type", |
| 1369 | loc, sshkey_type(id->key), fp); |
| 1370 | continue; |
| 1371 | } |
djm@openbsd.org | 881aded | 2020-01-21 05:56:27 +0000 | [diff] [blame] | 1372 | error("%s: signing failed for %s \"%s\"%s: %s", __func__, |
| 1373 | sshkey_type(sign_id->key), sign_id->filename, |
| 1374 | id->agent_fd != -1 ? " from agent" : "", ssh_err(r)); |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1375 | goto out; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1376 | } |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1377 | if (slen == 0 || signature == NULL) /* shouldn't happen */ |
| 1378 | fatal("%s: no signature", __func__); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1379 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1380 | /* append signature */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1381 | if ((r = sshbuf_put_string(b, signature, slen)) != 0) |
| 1382 | fatal("%s: append signature: %s", __func__, ssh_err(r)); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1383 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1384 | #ifdef DEBUG_PK |
| 1385 | sshbuf_dump(b, stderr); |
| 1386 | #endif |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1387 | /* skip session id and packet type */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1388 | if ((r = sshbuf_consume(b, skip + 1)) != 0) |
| 1389 | fatal("%s: consume: %s", __func__, ssh_err(r)); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1390 | |
| 1391 | /* put remaining data from buffer into packet */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1392 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1393 | (r = sshpkt_putb(ssh, b)) != 0 || |
| 1394 | (r = sshpkt_send(ssh)) != 0) |
| 1395 | fatal("%s: enqueue request: %s", __func__, ssh_err(r)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1396 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1397 | /* success */ |
| 1398 | sent = 1; |
| 1399 | |
| 1400 | out: |
| 1401 | free(fp); |
| 1402 | free(alg); |
| 1403 | sshbuf_free(b); |
| 1404 | freezero(signature, slen); |
| 1405 | return sent; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1406 | } |
| 1407 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1408 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1409 | send_pubkey_test(struct ssh *ssh, Identity *id) |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1410 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1411 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1412 | u_char *blob = NULL; |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1413 | char *alg = NULL; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1414 | size_t bloblen; |
| 1415 | u_int have_sig = 0; |
| 1416 | int sent = 0, r; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1417 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1418 | if ((alg = key_sig_algorithm(ssh, id->key)) == NULL) { |
| 1419 | debug("%s: no mutual signature algorithm", __func__); |
| 1420 | goto out; |
| 1421 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1422 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1423 | if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1424 | /* we cannot handle this key */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1425 | debug3("%s: cannot handle key", __func__); |
| 1426 | goto out; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1427 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1428 | /* register callback for USERAUTH_PK_OK message */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1429 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1430 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1431 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1432 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1433 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1434 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1435 | (r = sshpkt_put_u8(ssh, have_sig)) != 0 || |
| 1436 | (r = sshpkt_put_cstring(ssh, alg)) != 0 || |
| 1437 | (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 || |
| 1438 | (r = sshpkt_send(ssh)) != 0) |
| 1439 | fatal("%s: %s", __func__, ssh_err(r)); |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1440 | sent = 1; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1441 | |
| 1442 | out: |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1443 | free(alg); |
| 1444 | free(blob); |
| 1445 | return sent; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1446 | } |
| 1447 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1448 | static struct sshkey * |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1449 | load_identity_file(Identity *id) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1450 | { |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1451 | struct sshkey *private = NULL; |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1452 | char prompt[300], *passphrase, *comment; |
dtucker@openbsd.org | 6b39a7b | 2019-08-05 11:50:33 +0000 | [diff] [blame] | 1453 | int r, quit = 0, i; |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 1454 | struct stat st; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1455 | |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1456 | if (stat(id->filename, &st) == -1) { |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1457 | (id->userprovided ? logit : debug3)("no such identity: %s: %s", |
| 1458 | id->filename, strerror(errno)); |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 1459 | return NULL; |
| 1460 | } |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1461 | snprintf(prompt, sizeof prompt, |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1462 | "Enter passphrase for key '%.100s': ", id->filename); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1463 | for (i = 0; i <= options.number_of_password_prompts; i++) { |
| 1464 | if (i == 0) |
| 1465 | passphrase = ""; |
| 1466 | else { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1467 | passphrase = read_passphrase(prompt, 0); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1468 | if (*passphrase == '\0') { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1469 | debug2("no passphrase given, try next key"); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1470 | free(passphrase); |
| 1471 | break; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1472 | } |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1473 | } |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1474 | switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename, |
dtucker@openbsd.org | 6b39a7b | 2019-08-05 11:50:33 +0000 | [diff] [blame] | 1475 | passphrase, &private, &comment))) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1476 | case 0: |
| 1477 | break; |
| 1478 | case SSH_ERR_KEY_WRONG_PASSPHRASE: |
| 1479 | if (options.batch_mode) { |
| 1480 | quit = 1; |
| 1481 | break; |
| 1482 | } |
djm@openbsd.org | f14564c | 2015-01-15 11:04:36 +0000 | [diff] [blame] | 1483 | if (i != 0) |
| 1484 | debug2("bad passphrase given, try again..."); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1485 | break; |
| 1486 | case SSH_ERR_SYSTEM_ERROR: |
| 1487 | if (errno == ENOENT) { |
| 1488 | debug2("Load key \"%s\": %s", |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1489 | id->filename, ssh_err(r)); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1490 | quit = 1; |
| 1491 | break; |
| 1492 | } |
| 1493 | /* FALLTHROUGH */ |
| 1494 | default: |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1495 | error("Load key \"%s\": %s", id->filename, ssh_err(r)); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1496 | quit = 1; |
| 1497 | break; |
| 1498 | } |
markus@openbsd.org | 2c55744 | 2019-11-12 19:33:08 +0000 | [diff] [blame] | 1499 | if (private != NULL && sshkey_is_sk(private) && |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1500 | options.sk_provider == NULL) { |
naddy@openbsd.org | a47f6a6 | 2020-02-06 22:30:54 +0000 | [diff] [blame] | 1501 | debug("key \"%s\" is an authenticator-hosted key, " |
| 1502 | "but no provider specified", id->filename); |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1503 | sshkey_free(private); |
| 1504 | private = NULL; |
| 1505 | quit = 1; |
| 1506 | } |
djm@openbsd.org | 6064a8b | 2015-12-04 00:24:55 +0000 | [diff] [blame] | 1507 | if (!quit && private != NULL && id->agent_fd == -1 && |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1508 | !(id->key && id->isprivate)) |
| 1509 | maybe_add_key_to_agent(id->filename, private, comment, |
| 1510 | passphrase); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1511 | if (i > 0) |
| 1512 | freezero(passphrase, strlen(passphrase)); |
mmcc@openbsd.org | d59ce08 | 2015-12-10 17:08:40 +0000 | [diff] [blame] | 1513 | free(comment); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1514 | if (private != NULL || quit) |
| 1515 | break; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1516 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1517 | return private; |
| 1518 | } |
| 1519 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1520 | static int |
| 1521 | key_type_allowed_by_config(struct sshkey *key) |
| 1522 | { |
| 1523 | if (match_pattern_list(sshkey_ssh_name(key), |
| 1524 | options.pubkey_key_types, 0) == 1) |
| 1525 | return 1; |
| 1526 | |
| 1527 | /* RSA keys/certs might be allowed by alternate signature types */ |
| 1528 | switch (key->type) { |
| 1529 | case KEY_RSA: |
| 1530 | if (match_pattern_list("rsa-sha2-512", |
| 1531 | options.pubkey_key_types, 0) == 1) |
| 1532 | return 1; |
| 1533 | if (match_pattern_list("rsa-sha2-256", |
| 1534 | options.pubkey_key_types, 0) == 1) |
| 1535 | return 1; |
| 1536 | break; |
| 1537 | case KEY_RSA_CERT: |
| 1538 | if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com", |
| 1539 | options.pubkey_key_types, 0) == 1) |
| 1540 | return 1; |
| 1541 | if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com", |
| 1542 | options.pubkey_key_types, 0) == 1) |
| 1543 | return 1; |
| 1544 | break; |
| 1545 | } |
| 1546 | return 0; |
| 1547 | } |
| 1548 | |
| 1549 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1550 | /* |
| 1551 | * try keys in the following order: |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1552 | * 1. certificates listed in the config file |
| 1553 | * 2. other input certificates |
| 1554 | * 3. agent keys that are found in the config file |
| 1555 | * 4. other agent keys |
| 1556 | * 5. keys that are only listed in the config file |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1557 | */ |
| 1558 | static void |
| 1559 | pubkey_prepare(Authctxt *authctxt) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1560 | { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1561 | struct identity *id, *id2, *tmp; |
| 1562 | struct idlist agent, files, *preferred; |
| 1563 | struct sshkey *key; |
djm@openbsd.org | 6064a8b | 2015-12-04 00:24:55 +0000 | [diff] [blame] | 1564 | int agent_fd = -1, i, r, found; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1565 | size_t j; |
| 1566 | struct ssh_identitylist *idlist; |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 1567 | char *ident; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1568 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1569 | TAILQ_INIT(&agent); /* keys from the agent */ |
| 1570 | TAILQ_INIT(&files); /* keys from the config file */ |
| 1571 | preferred = &authctxt->keys; |
| 1572 | TAILQ_INIT(preferred); /* preferred order of keys */ |
| 1573 | |
Damien Miller | cb6b68b | 2012-12-03 09:49:52 +1100 | [diff] [blame] | 1574 | /* list of keys stored in the filesystem and PKCS#11 */ |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1575 | for (i = 0; i < options.num_identity_files; i++) { |
| 1576 | key = options.identity_keys[i]; |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1577 | if (key && key->cert && |
| 1578 | key->cert->type != SSH2_CERT_TYPE_USER) { |
| 1579 | debug("%s: ignoring certificate %s: not a user " |
| 1580 | "certificate", __func__, |
| 1581 | options.identity_files[i]); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1582 | continue; |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1583 | } |
markus@openbsd.org | 2c55744 | 2019-11-12 19:33:08 +0000 | [diff] [blame] | 1584 | if (key && sshkey_is_sk(key) && options.sk_provider == NULL) { |
naddy@openbsd.org | a47f6a6 | 2020-02-06 22:30:54 +0000 | [diff] [blame] | 1585 | debug("%s: ignoring authenticator-hosted key %s as no " |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1586 | "SecurityKeyProvider has been specified", |
| 1587 | __func__, options.identity_files[i]); |
| 1588 | continue; |
| 1589 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1590 | options.identity_keys[i] = NULL; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1591 | id = xcalloc(1, sizeof(*id)); |
djm@openbsd.org | 6064a8b | 2015-12-04 00:24:55 +0000 | [diff] [blame] | 1592 | id->agent_fd = -1; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1593 | id->key = key; |
| 1594 | id->filename = xstrdup(options.identity_files[i]); |
Darren Tucker | 1910478 | 2013-04-05 11:13:08 +1100 | [diff] [blame] | 1595 | id->userprovided = options.identity_file_userprovided[i]; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1596 | TAILQ_INSERT_TAIL(&files, id, next); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1597 | } |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1598 | /* list of certificates specified by user */ |
| 1599 | for (i = 0; i < options.num_certificate_files; i++) { |
| 1600 | key = options.certificates[i]; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1601 | if (!sshkey_is_cert(key) || key->cert == NULL || |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1602 | key->cert->type != SSH2_CERT_TYPE_USER) { |
| 1603 | debug("%s: ignoring certificate %s: not a user " |
| 1604 | "certificate", __func__, |
| 1605 | options.identity_files[i]); |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1606 | continue; |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1607 | } |
markus@openbsd.org | 2c55744 | 2019-11-12 19:33:08 +0000 | [diff] [blame] | 1608 | if (key && sshkey_is_sk(key) && options.sk_provider == NULL) { |
naddy@openbsd.org | a47f6a6 | 2020-02-06 22:30:54 +0000 | [diff] [blame] | 1609 | debug("%s: ignoring authenticator-hosted key " |
| 1610 | "certificate %s as no " |
djm@openbsd.org | 884416b | 2019-10-31 21:18:28 +0000 | [diff] [blame] | 1611 | "SecurityKeyProvider has been specified", |
| 1612 | __func__, options.identity_files[i]); |
| 1613 | continue; |
| 1614 | } |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1615 | id = xcalloc(1, sizeof(*id)); |
djm@openbsd.org | 6064a8b | 2015-12-04 00:24:55 +0000 | [diff] [blame] | 1616 | id->agent_fd = -1; |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1617 | id->key = key; |
| 1618 | id->filename = xstrdup(options.certificate_files[i]); |
| 1619 | id->userprovided = options.certificate_file_userprovided[i]; |
| 1620 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1621 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1622 | /* list of keys supported by the agent */ |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1623 | if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) { |
| 1624 | if (r != SSH_ERR_AGENT_NOT_PRESENT) |
| 1625 | debug("%s: ssh_get_authentication_socket: %s", |
| 1626 | __func__, ssh_err(r)); |
naddy@openbsd.org | 3e371bd | 2017-05-05 10:42:49 +0000 | [diff] [blame] | 1627 | } else if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1628 | if (r != SSH_ERR_AGENT_NO_IDENTITIES) |
| 1629 | debug("%s: ssh_fetch_identitylist: %s", |
| 1630 | __func__, ssh_err(r)); |
markus@openbsd.org | fc77ccd | 2016-01-14 22:56:56 +0000 | [diff] [blame] | 1631 | close(agent_fd); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1632 | } else { |
| 1633 | for (j = 0; j < idlist->nkeys; j++) { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1634 | found = 0; |
| 1635 | TAILQ_FOREACH(id, &files, next) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1636 | /* |
| 1637 | * agent keys from the config file are |
| 1638 | * preferred |
| 1639 | */ |
| 1640 | if (sshkey_equal(idlist->keys[j], id->key)) { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1641 | TAILQ_REMOVE(&files, id, next); |
| 1642 | TAILQ_INSERT_TAIL(preferred, id, next); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1643 | id->agent_fd = agent_fd; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1644 | found = 1; |
| 1645 | break; |
| 1646 | } |
| 1647 | } |
Damien Miller | bd394c3 | 2004-03-08 23:12:36 +1100 | [diff] [blame] | 1648 | if (!found && !options.identities_only) { |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1649 | id = xcalloc(1, sizeof(*id)); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1650 | /* XXX "steals" key/comment from idlist */ |
| 1651 | id->key = idlist->keys[j]; |
| 1652 | id->filename = idlist->comments[j]; |
| 1653 | idlist->keys[j] = NULL; |
| 1654 | idlist->comments[j] = NULL; |
| 1655 | id->agent_fd = agent_fd; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1656 | TAILQ_INSERT_TAIL(&agent, id, next); |
| 1657 | } |
| 1658 | } |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1659 | ssh_free_identitylist(idlist); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1660 | /* append remaining agent keys */ |
| 1661 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { |
| 1662 | TAILQ_REMOVE(&agent, id, next); |
| 1663 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1664 | } |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1665 | authctxt->agent_fd = agent_fd; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1666 | } |
djm@openbsd.org | 82f24c3 | 2016-05-23 23:30:50 +0000 | [diff] [blame] | 1667 | /* Prefer PKCS11 keys that are explicitly listed */ |
| 1668 | TAILQ_FOREACH_SAFE(id, &files, next, tmp) { |
| 1669 | if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0) |
| 1670 | continue; |
| 1671 | found = 0; |
| 1672 | TAILQ_FOREACH(id2, &files, next) { |
| 1673 | if (id2->key == NULL || |
| 1674 | (id2->key->flags & SSHKEY_FLAG_EXT) == 0) |
| 1675 | continue; |
| 1676 | if (sshkey_equal(id->key, id2->key)) { |
| 1677 | TAILQ_REMOVE(&files, id, next); |
| 1678 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1679 | found = 1; |
| 1680 | break; |
| 1681 | } |
| 1682 | } |
| 1683 | /* If IdentitiesOnly set and key not found then don't use it */ |
| 1684 | if (!found && options.identities_only) { |
| 1685 | TAILQ_REMOVE(&files, id, next); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1686 | freezero(id, sizeof(*id)); |
djm@openbsd.org | 82f24c3 | 2016-05-23 23:30:50 +0000 | [diff] [blame] | 1687 | } |
| 1688 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1689 | /* append remaining keys from the config file */ |
| 1690 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { |
| 1691 | TAILQ_REMOVE(&files, id, next); |
| 1692 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1693 | } |
djm@openbsd.org | e679c09 | 2015-10-13 16:15:21 +0000 | [diff] [blame] | 1694 | /* finally, filter by PubkeyAcceptedKeyTypes */ |
| 1695 | TAILQ_FOREACH_SAFE(id, preferred, next, id2) { |
djm@openbsd.org | d78b75d | 2018-07-03 13:07:58 +0000 | [diff] [blame] | 1696 | if (id->key != NULL && !key_type_allowed_by_config(id->key)) { |
djm@openbsd.org | e679c09 | 2015-10-13 16:15:21 +0000 | [diff] [blame] | 1697 | debug("Skipping %s key %s - " |
| 1698 | "not in PubkeyAcceptedKeyTypes", |
| 1699 | sshkey_ssh_name(id->key), id->filename); |
| 1700 | TAILQ_REMOVE(preferred, id, next); |
| 1701 | sshkey_free(id->key); |
| 1702 | free(id->filename); |
| 1703 | memset(id, 0, sizeof(*id)); |
| 1704 | continue; |
| 1705 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1706 | } |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 1707 | /* List the keys we plan on using */ |
| 1708 | TAILQ_FOREACH_SAFE(id, preferred, next, id2) { |
| 1709 | ident = format_identity(id); |
| 1710 | debug("Will attempt key: %s", ident); |
| 1711 | free(ident); |
| 1712 | } |
| 1713 | debug2("%s: done", __func__); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1714 | } |
| 1715 | |
| 1716 | static void |
djm@openbsd.org | 38e83e4 | 2019-02-12 23:53:10 +0000 | [diff] [blame] | 1717 | pubkey_cleanup(struct ssh *ssh) |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1718 | { |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 1719 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1720 | Identity *id; |
| 1721 | |
djm@openbsd.org | aaed635 | 2018-11-16 02:46:20 +0000 | [diff] [blame] | 1722 | if (authctxt->agent_fd != -1) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1723 | ssh_close_authentication_socket(authctxt->agent_fd); |
djm@openbsd.org | aaed635 | 2018-11-16 02:46:20 +0000 | [diff] [blame] | 1724 | authctxt->agent_fd = -1; |
| 1725 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1726 | for (id = TAILQ_FIRST(&authctxt->keys); id; |
| 1727 | id = TAILQ_FIRST(&authctxt->keys)) { |
| 1728 | TAILQ_REMOVE(&authctxt->keys, id, next); |
mmcc@openbsd.org | 89540b6 | 2015-12-11 02:31:47 +0000 | [diff] [blame] | 1729 | sshkey_free(id->key); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1730 | free(id->filename); |
| 1731 | free(id); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1732 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1733 | } |
| 1734 | |
djm@openbsd.org | b9844a4 | 2016-12-04 23:54:02 +0000 | [diff] [blame] | 1735 | static void |
| 1736 | pubkey_reset(Authctxt *authctxt) |
| 1737 | { |
| 1738 | Identity *id; |
| 1739 | |
| 1740 | TAILQ_FOREACH(id, &authctxt->keys, next) |
| 1741 | id->tried = 0; |
| 1742 | } |
| 1743 | |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1744 | static int |
| 1745 | try_identity(Identity *id) |
| 1746 | { |
| 1747 | if (!id->key) |
| 1748 | return (0); |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1749 | if (sshkey_type_plain(id->key->type) == KEY_RSA && |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1750 | (datafellows & SSH_BUG_RSASIGMD5) != 0) { |
| 1751 | debug("Skipped %s key %s for RSA/MD5 server", |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1752 | sshkey_type(id->key), id->filename); |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1753 | return (0); |
| 1754 | } |
djm@openbsd.org | 873d3e7 | 2017-04-30 23:18:44 +0000 | [diff] [blame] | 1755 | return 1; |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1756 | } |
| 1757 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 1758 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1759 | userauth_pubkey(struct ssh *ssh) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1760 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1761 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1762 | Identity *id; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1763 | int sent = 0; |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 1764 | char *ident; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1765 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1766 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
| 1767 | if (id->tried++) |
| 1768 | return (0); |
Darren Tucker | d05b601 | 2003-10-15 15:55:59 +1000 | [diff] [blame] | 1769 | /* move key to the end of the queue */ |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1770 | TAILQ_REMOVE(&authctxt->keys, id, next); |
| 1771 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); |
| 1772 | /* |
| 1773 | * send a test message if we have the public key. for |
| 1774 | * encrypted keys we cannot do this and have to load the |
| 1775 | * private key instead |
| 1776 | */ |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 1777 | if (id->key != NULL) { |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1778 | if (try_identity(id)) { |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 1779 | ident = format_identity(id); |
| 1780 | debug("Offering public key: %s", ident); |
| 1781 | free(ident); |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1782 | sent = send_pubkey_test(ssh, id); |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 1783 | } |
| 1784 | } else { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1785 | debug("Trying private key: %s", id->filename); |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1786 | id->key = load_identity_file(id); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1787 | if (id->key != NULL) { |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1788 | if (try_identity(id)) { |
| 1789 | id->isprivate = 1; |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1790 | sent = sign_and_send_pubkey(ssh, id); |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 1791 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1792 | sshkey_free(id->key); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1793 | id->key = NULL; |
djm@openbsd.org | b9844a4 | 2016-12-04 23:54:02 +0000 | [diff] [blame] | 1794 | id->isprivate = 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1795 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1796 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1797 | if (sent) |
| 1798 | return (sent); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1799 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1800 | return (0); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1801 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1802 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1803 | /* |
| 1804 | * Send userauth request message specifying keyboard-interactive method. |
| 1805 | */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 1806 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1807 | userauth_kbdint(struct ssh *ssh) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1808 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1809 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1810 | int r; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1811 | |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 1812 | if (authctxt->attempt_kbdint++ >= options.number_of_password_prompts) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1813 | return 0; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1814 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 1815 | if (authctxt->attempt_kbdint > 1 && !authctxt->info_req_seen) { |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1816 | debug3("userauth_kbdint: disable: no info_req_seen"); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1817 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1818 | return 0; |
| 1819 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1820 | |
| 1821 | debug2("userauth_kbdint"); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1822 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1823 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1824 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1825 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1826 | (r = sshpkt_put_cstring(ssh, "")) != 0 || /* lang */ |
| 1827 | (r = sshpkt_put_cstring(ssh, options.kbd_interactive_devices ? |
| 1828 | options.kbd_interactive_devices : "")) != 0 || |
| 1829 | (r = sshpkt_send(ssh)) != 0) |
| 1830 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1831 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1832 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1833 | return 1; |
| 1834 | } |
| 1835 | |
| 1836 | /* |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1837 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1838 | */ |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 1839 | static int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 1840 | input_userauth_info_req(int type, u_int32_t seq, struct ssh *ssh) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1841 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 1842 | Authctxt *authctxt = ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1843 | char *name = NULL, *inst = NULL, *lang = NULL, *prompt = NULL; |
| 1844 | char *response = NULL; |
| 1845 | u_char echo = 0; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1846 | u_int num_prompts, i; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1847 | int r; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1848 | |
| 1849 | debug2("input_userauth_info_req"); |
| 1850 | |
| 1851 | if (authctxt == NULL) |
| 1852 | fatal("input_userauth_info_req: no authentication context"); |
| 1853 | |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1854 | authctxt->info_req_seen = 1; |
| 1855 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1856 | if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 || |
| 1857 | (r = sshpkt_get_cstring(ssh, &inst, NULL)) != 0 || |
| 1858 | (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0) |
| 1859 | goto out; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1860 | if (strlen(name) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1861 | logit("%s", name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1862 | if (strlen(inst) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1863 | logit("%s", inst); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1864 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1865 | if ((r = sshpkt_get_u32(ssh, &num_prompts)) != 0) |
| 1866 | goto out; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1867 | /* |
| 1868 | * Begin to build info response packet based on prompts requested. |
| 1869 | * We commit to providing the correct number of responses, so if |
| 1870 | * further on we run into a problem that prevents this, we have to |
| 1871 | * be sure and clean this up and send a correct error response. |
| 1872 | */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1873 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_INFO_RESPONSE)) != 0 || |
| 1874 | (r = sshpkt_put_u32(ssh, num_prompts)) != 0) |
| 1875 | goto out; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1876 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 1877 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1878 | for (i = 0; i < num_prompts; i++) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1879 | if ((r = sshpkt_get_cstring(ssh, &prompt, NULL)) != 0 || |
| 1880 | (r = sshpkt_get_u8(ssh, &echo)) != 0) |
| 1881 | goto out; |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 1882 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1883 | if ((r = sshpkt_put_cstring(ssh, response)) != 0) |
| 1884 | goto out; |
| 1885 | freezero(response, strlen(response)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1886 | free(prompt); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1887 | response = prompt = NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1888 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1889 | /* done with parsing incoming message. */ |
| 1890 | if ((r = sshpkt_get_end(ssh)) != 0 || |
| 1891 | (r = sshpkt_add_padding(ssh, 64)) != 0) |
| 1892 | goto out; |
| 1893 | r = sshpkt_send(ssh); |
| 1894 | out: |
| 1895 | if (response) |
| 1896 | freezero(response, strlen(response)); |
| 1897 | free(prompt); |
| 1898 | free(name); |
| 1899 | free(inst); |
| 1900 | free(lang); |
| 1901 | return r; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1902 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1903 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1904 | static int |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 1905 | ssh_keysign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp, |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1906 | const u_char *data, size_t datalen) |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1907 | { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1908 | struct sshbuf *b; |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1909 | struct stat st; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1910 | pid_t pid; |
deraadt@openbsd.org | a1d29cc | 2019-05-15 04:43:31 +0000 | [diff] [blame] | 1911 | int r, to[2], from[2], status; |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1912 | int sock = ssh_packet_get_connection_in(ssh); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1913 | u_char rversion = 0, version = 2; |
| 1914 | void (*osigchld)(int); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1915 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1916 | *sigp = NULL; |
| 1917 | *lenp = 0; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1918 | |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1919 | if (stat(_PATH_SSH_KEY_SIGN, &st) == -1) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1920 | error("%s: not installed: %s", __func__, strerror(errno)); |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1921 | return -1; |
| 1922 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1923 | if (fflush(stdout) != 0) { |
| 1924 | error("%s: fflush: %s", __func__, strerror(errno)); |
| 1925 | return -1; |
| 1926 | } |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1927 | if (pipe(to) == -1) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1928 | error("%s: pipe: %s", __func__, strerror(errno)); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1929 | return -1; |
| 1930 | } |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1931 | if (pipe(from) == -1) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1932 | error("%s: pipe: %s", __func__, strerror(errno)); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1933 | return -1; |
| 1934 | } |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1935 | if ((pid = fork()) == -1) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1936 | error("%s: fork: %s", __func__, strerror(errno)); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1937 | return -1; |
| 1938 | } |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 1939 | osigchld = ssh_signal(SIGCHLD, SIG_DFL); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1940 | if (pid == 0) { |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1941 | close(from[0]); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1942 | if (dup2(from[1], STDOUT_FILENO) == -1) |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1943 | fatal("%s: dup2: %s", __func__, strerror(errno)); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1944 | close(to[1]); |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1945 | if (dup2(to[0], STDIN_FILENO) == -1) |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1946 | fatal("%s: dup2: %s", __func__, strerror(errno)); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1947 | close(from[1]); |
| 1948 | close(to[0]); |
deraadt@openbsd.org | a1d29cc | 2019-05-15 04:43:31 +0000 | [diff] [blame] | 1949 | |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1950 | if (dup2(sock, STDERR_FILENO + 1) == -1) |
deraadt@openbsd.org | a1d29cc | 2019-05-15 04:43:31 +0000 | [diff] [blame] | 1951 | fatal("%s: dup2: %s", __func__, strerror(errno)); |
| 1952 | sock = STDERR_FILENO + 1; |
| 1953 | fcntl(sock, F_SETFD, 0); /* keep the socket on exec */ |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1954 | closefrom(sock + 1); |
deraadt@openbsd.org | a1d29cc | 2019-05-15 04:43:31 +0000 | [diff] [blame] | 1955 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1956 | debug3("%s: [child] pid=%ld, exec %s", |
| 1957 | __func__, (long)getpid(), _PATH_SSH_KEY_SIGN); |
mmcc@openbsd.org | 94141b7 | 2015-12-11 00:20:04 +0000 | [diff] [blame] | 1958 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *)NULL); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1959 | fatal("%s: exec(%s): %s", __func__, _PATH_SSH_KEY_SIGN, |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1960 | strerror(errno)); |
| 1961 | } |
| 1962 | close(from[1]); |
| 1963 | close(to[0]); |
djm@openbsd.org | c586d2d | 2019-05-31 03:20:07 +0000 | [diff] [blame] | 1964 | sock = STDERR_FILENO + 1; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1965 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1966 | if ((b = sshbuf_new()) == NULL) |
| 1967 | fatal("%s: sshbuf_new failed", __func__); |
| 1968 | /* send # of sock, data to be signed */ |
djm@openbsd.org | 326e2fa | 2017-01-30 00:32:28 +0000 | [diff] [blame] | 1969 | if ((r = sshbuf_put_u32(b, sock)) != 0 || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1970 | (r = sshbuf_put_string(b, data, datalen)) != 0) |
| 1971 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 1972 | if (ssh_msg_send(to[1], version, b) == -1) |
| 1973 | fatal("%s: couldn't send request", __func__); |
| 1974 | sshbuf_reset(b); |
| 1975 | r = ssh_msg_recv(from[0], b); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1976 | close(from[0]); |
| 1977 | close(to[1]); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1978 | if (r < 0) { |
| 1979 | error("%s: no reply", __func__); |
| 1980 | goto fail; |
| 1981 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1982 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1983 | errno = 0; |
deraadt@openbsd.org | 4d28fa7 | 2019-06-28 13:35:04 +0000 | [diff] [blame] | 1984 | while (waitpid(pid, &status, 0) == -1) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1985 | if (errno != EINTR) { |
| 1986 | error("%s: waitpid %ld: %s", |
| 1987 | __func__, (long)pid, strerror(errno)); |
| 1988 | goto fail; |
| 1989 | } |
| 1990 | } |
| 1991 | if (!WIFEXITED(status)) { |
| 1992 | error("%s: exited abnormally", __func__); |
| 1993 | goto fail; |
| 1994 | } |
| 1995 | if (WEXITSTATUS(status) != 0) { |
| 1996 | error("%s: exited with status %d", |
| 1997 | __func__, WEXITSTATUS(status)); |
| 1998 | goto fail; |
| 1999 | } |
| 2000 | if ((r = sshbuf_get_u8(b, &rversion)) != 0) { |
| 2001 | error("%s: buffer error: %s", __func__, ssh_err(r)); |
| 2002 | goto fail; |
| 2003 | } |
| 2004 | if (rversion != version) { |
| 2005 | error("%s: bad version", __func__); |
| 2006 | goto fail; |
| 2007 | } |
| 2008 | if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) { |
| 2009 | error("%s: buffer error: %s", __func__, ssh_err(r)); |
| 2010 | fail: |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 2011 | ssh_signal(SIGCHLD, osigchld); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2012 | sshbuf_free(b); |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 2013 | return -1; |
| 2014 | } |
dtucker@openbsd.org | 3bf2a6a | 2020-01-23 07:10:22 +0000 | [diff] [blame] | 2015 | ssh_signal(SIGCHLD, osigchld); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2016 | sshbuf_free(b); |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 2017 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 2018 | return 0; |
| 2019 | } |
| 2020 | |
djm@openbsd.org | 5c68ea8 | 2019-02-11 09:44:42 +0000 | [diff] [blame] | 2021 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 2022 | userauth_hostbased(struct ssh *ssh) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 2023 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 2024 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2025 | struct sshkey *private = NULL; |
| 2026 | struct sshbuf *b = NULL; |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2027 | u_char *sig = NULL, *keyblob = NULL; |
| 2028 | char *fp = NULL, *chost = NULL, *lname = NULL; |
| 2029 | size_t siglen = 0, keylen = 0; |
| 2030 | int i, r, success = 0; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 2031 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2032 | if (authctxt->ktypes == NULL) { |
| 2033 | authctxt->oktypes = xstrdup(options.hostbased_key_types); |
| 2034 | authctxt->ktypes = authctxt->oktypes; |
| 2035 | } |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 2036 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2037 | /* |
| 2038 | * Work through each listed type pattern in HostbasedKeyTypes, |
| 2039 | * trying each hostkey that matches the type in turn. |
| 2040 | */ |
| 2041 | for (;;) { |
| 2042 | if (authctxt->active_ktype == NULL) |
| 2043 | authctxt->active_ktype = strsep(&authctxt->ktypes, ","); |
| 2044 | if (authctxt->active_ktype == NULL || |
| 2045 | *authctxt->active_ktype == '\0') |
| 2046 | break; |
| 2047 | debug3("%s: trying key type %s", __func__, |
| 2048 | authctxt->active_ktype); |
| 2049 | |
| 2050 | /* check for a useful key */ |
| 2051 | private = NULL; |
| 2052 | for (i = 0; i < authctxt->sensitive->nkeys; i++) { |
| 2053 | if (authctxt->sensitive->keys[i] == NULL || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2054 | authctxt->sensitive->keys[i]->type == KEY_UNSPEC) |
| 2055 | continue; |
| 2056 | if (match_pattern_list( |
| 2057 | sshkey_ssh_name(authctxt->sensitive->keys[i]), |
djm@openbsd.org | e661a86 | 2015-05-04 06:10:48 +0000 | [diff] [blame] | 2058 | authctxt->active_ktype, 0) != 1) |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2059 | continue; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 2060 | /* we take and free the key */ |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2061 | private = authctxt->sensitive->keys[i]; |
| 2062 | authctxt->sensitive->keys[i] = NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 2063 | break; |
| 2064 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2065 | /* Found one */ |
| 2066 | if (private != NULL) |
| 2067 | break; |
| 2068 | /* No more keys of this type; advance */ |
| 2069 | authctxt->active_ktype = NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 2070 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2071 | if (private == NULL) { |
| 2072 | free(authctxt->oktypes); |
| 2073 | authctxt->oktypes = authctxt->ktypes = NULL; |
| 2074 | authctxt->active_ktype = NULL; |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 2075 | debug("No more client hostkeys for hostbased authentication."); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2076 | goto out; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 2077 | } |
djm@openbsd.org | 17bf3d8 | 2014-12-11 05:13:28 +0000 | [diff] [blame] | 2078 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2079 | if ((fp = sshkey_fingerprint(private, options.fingerprint_hash, |
| 2080 | SSH_FP_DEFAULT)) == NULL) { |
| 2081 | error("%s: sshkey_fingerprint failed", __func__); |
| 2082 | goto out; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 2083 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2084 | debug("%s: trying hostkey %s %s", |
| 2085 | __func__, sshkey_ssh_name(private), fp); |
djm@openbsd.org | 17bf3d8 | 2014-12-11 05:13:28 +0000 | [diff] [blame] | 2086 | |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 2087 | /* figure out a name for the client host */ |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 2088 | lname = get_local_name(ssh_packet_get_connection_in(ssh)); |
| 2089 | if (lname == NULL) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2090 | error("%s: cannot get local ipaddr/name", __func__); |
| 2091 | goto out; |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 2092 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2093 | |
| 2094 | /* XXX sshbuf_put_stringf? */ |
| 2095 | xasprintf(&chost, "%s.", lname); |
| 2096 | debug2("%s: chost %s", __func__, chost); |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 2097 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2098 | /* construct data */ |
| 2099 | if ((b = sshbuf_new()) == NULL) { |
| 2100 | error("%s: sshbuf_new failed", __func__); |
| 2101 | goto out; |
| 2102 | } |
| 2103 | if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) { |
| 2104 | error("%s: sshkey_to_blob: %s", __func__, ssh_err(r)); |
| 2105 | goto out; |
| 2106 | } |
| 2107 | if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 || |
| 2108 | (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 2109 | (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 || |
djm@openbsd.org | 14b5c63 | 2018-01-23 05:27:21 +0000 | [diff] [blame] | 2110 | (r = sshbuf_put_cstring(b, authctxt->service)) != 0 || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2111 | (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 || |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 2112 | (r = sshbuf_put_cstring(b, sshkey_ssh_name(private))) != 0 || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2113 | (r = sshbuf_put_string(b, keyblob, keylen)) != 0 || |
| 2114 | (r = sshbuf_put_cstring(b, chost)) != 0 || |
| 2115 | (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) { |
| 2116 | error("%s: buffer error: %s", __func__, ssh_err(r)); |
| 2117 | goto out; |
| 2118 | } |
| 2119 | |
| 2120 | #ifdef DEBUG_PK |
| 2121 | sshbuf_dump(b, stderr); |
| 2122 | #endif |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 2123 | if ((r = ssh_keysign(ssh, private, &sig, &siglen, |
| 2124 | sshbuf_ptr(b), sshbuf_len(b))) != 0) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2125 | error("sign using hostkey %s %s failed", |
| 2126 | sshkey_ssh_name(private), fp); |
| 2127 | goto out; |
| 2128 | } |
| 2129 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 2130 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 2131 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 2132 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 2133 | (r = sshpkt_put_cstring(ssh, sshkey_ssh_name(private))) != 0 || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2134 | (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 || |
| 2135 | (r = sshpkt_put_cstring(ssh, chost)) != 0 || |
| 2136 | (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 || |
| 2137 | (r = sshpkt_put_string(ssh, sig, siglen)) != 0 || |
| 2138 | (r = sshpkt_send(ssh)) != 0) { |
| 2139 | error("%s: packet error: %s", __func__, ssh_err(r)); |
| 2140 | goto out; |
| 2141 | } |
| 2142 | success = 1; |
| 2143 | |
| 2144 | out: |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2145 | if (sig != NULL) |
| 2146 | freezero(sig, siglen); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2147 | free(keyblob); |
| 2148 | free(lname); |
| 2149 | free(fp); |
| 2150 | free(chost); |
| 2151 | sshkey_free(private); |
| 2152 | sshbuf_free(b); |
| 2153 | |
| 2154 | return success; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 2155 | } |
| 2156 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2157 | /* find auth method */ |
| 2158 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2159 | /* |
| 2160 | * given auth method name, if configurable options permit this method fill |
| 2161 | * in auth_ident field and return true, otherwise return false. |
| 2162 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2163 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2164 | authmethod_is_enabled(Authmethod *method) |
| 2165 | { |
| 2166 | if (method == NULL) |
| 2167 | return 0; |
| 2168 | /* return false if options indicate this method is disabled */ |
| 2169 | if (method->enabled == NULL || *method->enabled == 0) |
| 2170 | return 0; |
| 2171 | /* return false if batch mode is enabled but method needs interactive mode */ |
| 2172 | if (method->batch_flag != NULL && *method->batch_flag != 0) |
| 2173 | return 0; |
| 2174 | return 1; |
| 2175 | } |
| 2176 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2177 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2178 | authmethod_lookup(const char *name) |
| 2179 | { |
| 2180 | Authmethod *method = NULL; |
| 2181 | if (name != NULL) |
| 2182 | for (method = authmethods; method->name != NULL; method++) |
| 2183 | if (strcmp(name, method->name) == 0) |
| 2184 | return method; |
| 2185 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); |
| 2186 | return NULL; |
| 2187 | } |
| 2188 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2189 | /* XXX internal state */ |
| 2190 | static Authmethod *current = NULL; |
| 2191 | static char *supported = NULL; |
| 2192 | static char *preferred = NULL; |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 2193 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2194 | /* |
| 2195 | * Given the authentication method list sent by the server, return the |
| 2196 | * next method we should try. If the server initially sends a nil list, |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2197 | * use a built-in default list. |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2198 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2199 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2200 | authmethod_get(char *authlist) |
| 2201 | { |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2202 | char *name = NULL; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 2203 | u_int next; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2204 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2205 | /* Use a suitable default if we're passed a nil list. */ |
| 2206 | if (authlist == NULL || strlen(authlist) == 0) |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2207 | authlist = options.preferred_authentications; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2208 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2209 | if (supported == NULL || strcmp(authlist, supported) != 0) { |
| 2210 | debug3("start over, passed a different list %s", authlist); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2211 | free(supported); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2212 | supported = xstrdup(authlist); |
| 2213 | preferred = options.preferred_authentications; |
| 2214 | debug3("preferred %s", preferred); |
| 2215 | current = NULL; |
| 2216 | } else if (current != NULL && authmethod_is_enabled(current)) |
| 2217 | return current; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 2218 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2219 | for (;;) { |
| 2220 | if ((name = match_list(preferred, supported, &next)) == NULL) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 2221 | debug("No more authentication methods to try."); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2222 | current = NULL; |
| 2223 | return NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 2224 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2225 | preferred += next; |
| 2226 | debug3("authmethod_lookup %s", name); |
| 2227 | debug3("remaining preferred: %s", preferred); |
| 2228 | if ((current = authmethod_lookup(name)) != NULL && |
| 2229 | authmethod_is_enabled(current)) { |
| 2230 | debug3("authmethod_is_enabled %s", name); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 2231 | debug("Next authentication method: %s", name); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2232 | free(name); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2233 | return current; |
| 2234 | } |
Darren Tucker | e52a260 | 2013-06-06 08:22:05 +1000 | [diff] [blame] | 2235 | free(name); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 2236 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2237 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2238 | |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 2239 | static char * |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2240 | authmethods_get(void) |
| 2241 | { |
| 2242 | Authmethod *method = NULL; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2243 | struct sshbuf *b; |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 2244 | char *list; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2245 | int r; |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2246 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2247 | if ((b = sshbuf_new()) == NULL) |
| 2248 | fatal("%s: sshbuf_new failed", __func__); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2249 | for (method = authmethods; method->name != NULL; method++) { |
| 2250 | if (authmethod_is_enabled(method)) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2251 | if ((r = sshbuf_putf(b, "%s%s", |
| 2252 | sshbuf_len(b) ? "," : "", method->name)) != 0) |
| 2253 | fatal("%s: buffer error: %s", |
| 2254 | __func__, ssh_err(r)); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2255 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2256 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2257 | if ((list = sshbuf_dup_string(b)) == NULL) |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 2258 | fatal("%s: sshbuf_dup_string failed", __func__); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2259 | sshbuf_free(b); |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 2260 | return list; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 2261 | } |