djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1 | /* $OpenBSD: sshconnect2.c,v 1.295 2019/01/19 21:40:21 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 | ded319c | 2006-09-01 15:38:36 +1000 | [diff] [blame] | 39 | #include <stdarg.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 40 | #include <stdio.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 41 | #include <string.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" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 75 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 76 | #ifdef GSSAPI |
| 77 | #include "ssh-gss.h" |
| 78 | #endif |
| 79 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 80 | /* import */ |
| 81 | extern char *client_version_string; |
| 82 | extern char *server_version_string; |
| 83 | extern Options options; |
| 84 | |
| 85 | /* |
| 86 | * SSH2 key exchange |
| 87 | */ |
| 88 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 89 | u_char *session_id2 = NULL; |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 90 | u_int session_id2_len = 0; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 91 | |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 92 | char *xxx_host; |
| 93 | struct sockaddr *xxx_hostaddr; |
| 94 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 95 | static int |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 96 | verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh) |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 97 | { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 98 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
Damien Miller | 59d9fb9 | 2001-10-10 15:03:11 +1000 | [diff] [blame] | 99 | fatal("Host key verification failed."); |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 100 | return 0; |
| 101 | } |
| 102 | |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 103 | static char * |
| 104 | order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port) |
| 105 | { |
| 106 | char *oavail, *avail, *first, *last, *alg, *hostname, *ret; |
| 107 | size_t maxlen; |
| 108 | struct hostkeys *hostkeys; |
| 109 | int ktype; |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 110 | u_int i; |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 111 | |
| 112 | /* Find all hostkeys for this hostname */ |
| 113 | get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL); |
| 114 | hostkeys = init_hostkeys(); |
Damien Miller | 295ee63 | 2011-05-29 21:42:31 +1000 | [diff] [blame] | 115 | for (i = 0; i < options.num_user_hostfiles; i++) |
| 116 | load_hostkeys(hostkeys, hostname, options.user_hostfiles[i]); |
| 117 | for (i = 0; i < options.num_system_hostfiles; i++) |
| 118 | load_hostkeys(hostkeys, hostname, options.system_hostfiles[i]); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 119 | |
| 120 | oavail = avail = xstrdup(KEX_DEFAULT_PK_ALG); |
| 121 | maxlen = strlen(avail) + 1; |
| 122 | first = xmalloc(maxlen); |
| 123 | last = xmalloc(maxlen); |
| 124 | *first = *last = '\0'; |
| 125 | |
| 126 | #define ALG_APPEND(to, from) \ |
| 127 | do { \ |
| 128 | if (*to != '\0') \ |
| 129 | strlcat(to, ",", maxlen); \ |
| 130 | strlcat(to, from, maxlen); \ |
| 131 | } while (0) |
| 132 | |
| 133 | while ((alg = strsep(&avail, ",")) && *alg != '\0') { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 134 | if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC) |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 135 | fatal("%s: unknown alg %s", __func__, alg); |
| 136 | if (lookup_key_in_hostkeys_by_type(hostkeys, |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 137 | sshkey_type_plain(ktype), NULL)) |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 138 | ALG_APPEND(first, alg); |
| 139 | else |
| 140 | ALG_APPEND(last, alg); |
| 141 | } |
| 142 | #undef ALG_APPEND |
djm@openbsd.org | 35d6022 | 2015-01-18 13:33:34 +0000 | [diff] [blame] | 143 | xasprintf(&ret, "%s%s%s", first, |
| 144 | (*first == '\0' || *last == '\0') ? "" : ",", last); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 145 | if (*first != '\0') |
| 146 | debug3("%s: prefer hostkeyalgs: %s", __func__, first); |
| 147 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 148 | free(first); |
| 149 | free(last); |
| 150 | free(hostname); |
| 151 | free(oavail); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 152 | free_hostkeys(hostkeys); |
| 153 | |
| 154 | return ret; |
| 155 | } |
| 156 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 157 | void |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 158 | 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] | 159 | { |
Damien Miller | 9235a03 | 2014-04-20 13:17:20 +1000 | [diff] [blame] | 160 | char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; |
djm@openbsd.org | 312d2f2 | 2018-07-04 13:49:31 +0000 | [diff] [blame] | 161 | char *s, *all_key; |
markus@openbsd.org | 57e783c | 2015-01-20 20:16:21 +0000 | [diff] [blame] | 162 | int r; |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 163 | |
| 164 | xxx_host = host; |
| 165 | xxx_hostaddr = hostaddr; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 166 | |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 167 | if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL) |
| 168 | fatal("%s: kex_names_cat", __func__); |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 169 | myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(s); |
Damien Miller | a0ff466 | 2001-03-30 10:49:35 +1000 | [diff] [blame] | 170 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 171 | compat_cipher_proposal(options.ciphers); |
Damien Miller | a0ff466 | 2001-03-30 10:49:35 +1000 | [diff] [blame] | 172 | myproposal[PROPOSAL_ENC_ALGS_STOC] = |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 173 | compat_cipher_proposal(options.ciphers); |
dtucker@openbsd.org | 8c02e36 | 2016-05-24 04:43:45 +0000 | [diff] [blame] | 174 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
| 175 | myproposal[PROPOSAL_COMP_ALGS_STOC] = options.compression ? |
sf@openbsd.org | 168b46f | 2018-07-09 13:37:10 +0000 | [diff] [blame] | 176 | "zlib@openssh.com,zlib,none" : "none,zlib@openssh.com,zlib"; |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 177 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = |
| 178 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; |
| 179 | if (options.hostkeyalgorithms != NULL) { |
djm@openbsd.org | 312d2f2 | 2018-07-04 13:49:31 +0000 | [diff] [blame] | 180 | all_key = sshkey_alg_list(0, 0, 1, ','); |
| 181 | if (kex_assemble_names(&options.hostkeyalgorithms, |
| 182 | KEX_DEFAULT_PK_ALG, all_key) != 0) |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 183 | fatal("%s: kex_assemble_namelist", __func__); |
djm@openbsd.org | 312d2f2 | 2018-07-04 13:49:31 +0000 | [diff] [blame] | 184 | free(all_key); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 185 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 186 | compat_pkalg_proposal(options.hostkeyalgorithms); |
djm@openbsd.org | f9eca24 | 2015-07-30 00:01:34 +0000 | [diff] [blame] | 187 | } else { |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 188 | /* Enforce default */ |
| 189 | options.hostkeyalgorithms = xstrdup(KEX_DEFAULT_PK_ALG); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 190 | /* Prefer algorithms that we already have keys for */ |
| 191 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 192 | compat_pkalg_proposal( |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 193 | order_hostkeyalgs(host, hostaddr, port)); |
Damien Miller | d925dcd | 2010-12-01 12:21:51 +1100 | [diff] [blame] | 194 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 195 | |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 196 | if (options.rekey_limit || options.rekey_interval) |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 197 | ssh_packet_set_rekey_limits(ssh, options.rekey_limit, |
dtucker@openbsd.org | c998bf0 | 2017-02-03 02:56:00 +0000 | [diff] [blame] | 198 | options.rekey_interval); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 199 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 200 | /* start key exchange */ |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 201 | if ((r = kex_setup(ssh, myproposal)) != 0) |
markus@openbsd.org | 57e783c | 2015-01-20 20:16:21 +0000 | [diff] [blame] | 202 | fatal("kex_setup: %s", ssh_err(r)); |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 203 | #ifdef WITH_OPENSSL |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 204 | ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
| 205 | ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
| 206 | ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client; |
| 207 | ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client; |
| 208 | ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client; |
| 209 | ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
| 210 | ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
Darren Tucker | f2004cd | 2015-02-23 05:04:21 +1100 | [diff] [blame] | 211 | # ifdef OPENSSL_HAS_ECC |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 212 | ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client; |
Darren Tucker | f2004cd | 2015-02-23 05:04:21 +1100 | [diff] [blame] | 213 | # endif |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 214 | #endif |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 215 | ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client; |
| 216 | ssh->kex->verify_host_key=&verify_host_key_callback; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 217 | |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 218 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &ssh->kex->done); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 219 | |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 220 | /* remove ext-info from the KEX proposals for rekeying */ |
| 221 | myproposal[PROPOSAL_KEX_ALGS] = |
djm@openbsd.org | c3903c3 | 2018-08-13 02:41:05 +0000 | [diff] [blame] | 222 | compat_kex_proposal(options.kex_algorithms); |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 223 | if ((r = kex_prop2buf(ssh->kex->my, myproposal)) != 0) |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 224 | fatal("kex_prop2buf: %s", ssh_err(r)); |
Darren Tucker | 36331b5 | 2010-01-08 16:50:41 +1100 | [diff] [blame] | 225 | |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 226 | session_id2 = ssh->kex->session_id; |
| 227 | session_id2_len = ssh->kex->session_id_len; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 228 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 229 | #ifdef DEBUG_KEXDH |
| 230 | /* send 1st encrypted/maced/compressed message */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 231 | if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE)) != 0 || |
| 232 | (r = sshpkt_put_cstring(ssh, "markus")) != 0 || |
markus@openbsd.org | 394a842 | 2018-07-11 18:55:11 +0000 | [diff] [blame] | 233 | (r = sshpkt_send(ssh)) != 0 || |
| 234 | (r = ssh_packet_write_wait(ssh)) != 0) |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 235 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 236 | #endif |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 237 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 238 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 239 | /* |
| 240 | * Authenticate user |
| 241 | */ |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 242 | |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 243 | typedef struct cauthctxt Authctxt; |
| 244 | typedef struct cauthmethod Authmethod; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 245 | typedef struct identity Identity; |
| 246 | typedef struct idlist Idlist; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 247 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 248 | struct identity { |
| 249 | TAILQ_ENTRY(identity) next; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 250 | int agent_fd; /* >=0 if agent supports key */ |
| 251 | struct sshkey *key; /* public/private key */ |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 252 | char *filename; /* comment for agent-only keys */ |
| 253 | int tried; |
| 254 | int isprivate; /* key points to the private key */ |
Damien Miller | 5ceddc3 | 2013-02-15 12:18:32 +1100 | [diff] [blame] | 255 | int userprovided; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 256 | }; |
| 257 | TAILQ_HEAD(idlist, identity); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 258 | |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 259 | struct cauthctxt { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 260 | const char *server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 261 | const char *local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 262 | const char *host; |
| 263 | const char *service; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 264 | struct cauthmethod *method; |
Damien Miller | 79442c0 | 2010-05-10 11:55:38 +1000 | [diff] [blame] | 265 | sig_atomic_t success; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 266 | char *authlist; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 267 | /* pubkey */ |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 268 | struct idlist keys; |
| 269 | int agent_fd; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 270 | /* hostbased */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 271 | Sensitive *sensitive; |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 272 | char *oktypes, *ktypes; |
| 273 | const char *active_ktype; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 274 | /* kbd-interactive */ |
| 275 | int info_req_seen; |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 276 | int attempt_kbdint; |
| 277 | /* password */ |
| 278 | int attempt_passwd; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 279 | /* generic */ |
| 280 | void *methoddata; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 281 | }; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 282 | |
| 283 | struct cauthmethod { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 284 | char *name; /* string to compare against server's list */ |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 285 | int (*userauth)(struct ssh *ssh); |
| 286 | void (*cleanup)(struct ssh *ssh); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 287 | int *enabled; /* flag in option struct that enables method */ |
| 288 | int *batch_flag; /* flag in option struct that disables method */ |
| 289 | }; |
| 290 | |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 291 | int input_userauth_service_accept(int, u_int32_t, struct ssh *); |
| 292 | int input_userauth_ext_info(int, u_int32_t, struct ssh *); |
| 293 | int input_userauth_success(int, u_int32_t, struct ssh *); |
| 294 | int input_userauth_success_unexpected(int, u_int32_t, struct ssh *); |
| 295 | int input_userauth_failure(int, u_int32_t, struct ssh *); |
| 296 | int input_userauth_banner(int, u_int32_t, struct ssh *); |
| 297 | int input_userauth_error(int, u_int32_t, struct ssh *); |
| 298 | int input_userauth_info_req(int, u_int32_t, struct ssh *); |
| 299 | int input_userauth_pk_ok(int, u_int32_t, struct ssh *); |
| 300 | int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 301 | |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 302 | int userauth_none(struct ssh *); |
| 303 | int userauth_pubkey(struct ssh *); |
| 304 | int userauth_passwd(struct ssh *); |
| 305 | int userauth_kbdint(struct ssh *); |
| 306 | int userauth_hostbased(struct ssh *); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 307 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 308 | #ifdef GSSAPI |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 309 | int userauth_gssapi(struct ssh *); |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 310 | int input_gssapi_response(int type, u_int32_t, struct ssh *); |
| 311 | int input_gssapi_token(int type, u_int32_t, struct ssh *); |
| 312 | int input_gssapi_hash(int type, u_int32_t, struct ssh *); |
| 313 | int input_gssapi_error(int, u_int32_t, struct ssh *); |
| 314 | int input_gssapi_errtok(int, u_int32_t, struct ssh *); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 315 | #endif |
| 316 | |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 317 | void userauth(struct ssh *, char *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 318 | |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 319 | static int sign_and_send_pubkey(struct ssh *ssh, Identity *); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 320 | static void pubkey_prepare(Authctxt *); |
| 321 | static void pubkey_cleanup(Authctxt *); |
djm@openbsd.org | b9844a4 | 2016-12-04 23:54:02 +0000 | [diff] [blame] | 322 | static void pubkey_reset(Authctxt *); |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 323 | static struct sshkey *load_identity_file(Identity *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 324 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 325 | static Authmethod *authmethod_get(char *authlist); |
| 326 | static Authmethod *authmethod_lookup(const char *name); |
| 327 | static char *authmethods_get(void); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 328 | |
| 329 | Authmethod authmethods[] = { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 330 | #ifdef GSSAPI |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 331 | {"gssapi-with-mic", |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 332 | userauth_gssapi, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 333 | NULL, |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 334 | &options.gss_authentication, |
| 335 | NULL}, |
| 336 | #endif |
Ben Lindstrom | 1bfe291 | 2001-06-05 19:37:25 +0000 | [diff] [blame] | 337 | {"hostbased", |
| 338 | userauth_hostbased, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 339 | NULL, |
Ben Lindstrom | 1bfe291 | 2001-06-05 19:37:25 +0000 | [diff] [blame] | 340 | &options.hostbased_authentication, |
| 341 | NULL}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 342 | {"publickey", |
| 343 | userauth_pubkey, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 344 | NULL, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 345 | &options.pubkey_authentication, |
| 346 | NULL}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 347 | {"keyboard-interactive", |
| 348 | userauth_kbdint, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 349 | NULL, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 350 | &options.kbd_interactive_authentication, |
| 351 | &options.batch_mode}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 352 | {"password", |
| 353 | userauth_passwd, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 354 | NULL, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 355 | &options.password_authentication, |
| 356 | &options.batch_mode}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 357 | {"none", |
| 358 | userauth_none, |
| 359 | NULL, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 360 | NULL, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 361 | NULL}, |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 362 | {NULL, NULL, NULL, NULL, NULL} |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 363 | }; |
| 364 | |
| 365 | void |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 366 | ssh_userauth2(struct ssh *ssh, const char *local_user, |
| 367 | const char *server_user, char *host, Sensitive *sensitive) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 368 | { |
| 369 | Authctxt authctxt; |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 370 | int r; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 371 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 372 | if (options.challenge_response_authentication) |
Ben Lindstrom | 95fb2dd | 2001-01-23 03:12:10 +0000 | [diff] [blame] | 373 | options.kbd_interactive_authentication = 1; |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 374 | if (options.preferred_authentications == NULL) |
| 375 | options.preferred_authentications = authmethods_get(); |
| 376 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 377 | /* setup authentication context */ |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 378 | memset(&authctxt, 0, sizeof(authctxt)); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 379 | authctxt.server_user = server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 380 | authctxt.local_user = local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 381 | authctxt.host = host; |
| 382 | authctxt.service = "ssh-connection"; /* service name */ |
| 383 | authctxt.success = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 384 | authctxt.method = authmethod_lookup("none"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 385 | authctxt.authlist = NULL; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 386 | authctxt.methoddata = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 387 | authctxt.sensitive = sensitive; |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 388 | authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 389 | authctxt.info_req_seen = 0; |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 390 | authctxt.attempt_kbdint = 0; |
| 391 | authctxt.attempt_passwd = 0; |
djm@openbsd.org | f14564c | 2015-01-15 11:04:36 +0000 | [diff] [blame] | 392 | authctxt.agent_fd = -1; |
djm@openbsd.org | aaed635 | 2018-11-16 02:46:20 +0000 | [diff] [blame] | 393 | pubkey_prepare(&authctxt); |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 394 | if (authctxt.method == NULL) { |
| 395 | fatal("%s: internal error: cannot send userauth none request", |
| 396 | __func__); |
| 397 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 398 | |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 399 | if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST)) != 0 || |
| 400 | (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 || |
| 401 | (r = sshpkt_send(ssh)) != 0) |
| 402 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 403 | |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 404 | ssh->authctxt = &authctxt; |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 405 | ssh_dispatch_init(ssh, &input_userauth_error); |
| 406 | ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_ext_info); |
| 407 | 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] | 408 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */ |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 409 | ssh->authctxt = NULL; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 410 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 411 | pubkey_cleanup(&authctxt); |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 412 | 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] | 413 | |
dtucker@openbsd.org | f31c654 | 2016-09-22 02:29:57 +0000 | [diff] [blame] | 414 | if (!authctxt.success) |
| 415 | fatal("Authentication failed."); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 416 | debug("Authentication succeeded (%s).", authctxt.method->name); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 417 | } |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 418 | |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 419 | /* ARGSUSED */ |
| 420 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 421 | 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] | 422 | { |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 423 | int r; |
| 424 | |
| 425 | if (ssh_packet_remaining(ssh) > 0) { |
| 426 | char *reply; |
| 427 | |
| 428 | if ((r = sshpkt_get_cstring(ssh, &reply, NULL)) != 0) |
| 429 | goto out; |
| 430 | debug2("service_accept: %s", reply); |
| 431 | free(reply); |
| 432 | } else { |
| 433 | debug2("buggy server: service_accept w/o service"); |
| 434 | } |
| 435 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 436 | goto out; |
| 437 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
| 438 | |
| 439 | /* initial userauth request */ |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 440 | userauth_none(ssh); |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 441 | |
| 442 | ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_error); |
| 443 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
| 444 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); |
| 445 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
| 446 | r = 0; |
| 447 | out: |
| 448 | return r; |
| 449 | } |
| 450 | |
| 451 | /* ARGSUSED */ |
| 452 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 453 | 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] | 454 | { |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 455 | return kex_input_ext_info(type, seqnr, ssh); |
markus@openbsd.org | 76c9fbb | 2015-12-04 16:41:28 +0000 | [diff] [blame] | 456 | } |
| 457 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 458 | void |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 459 | userauth(struct ssh *ssh, char *authlist) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 460 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 461 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 462 | |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 463 | if (authctxt->method != NULL && authctxt->method->cleanup != NULL) |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 464 | authctxt->method->cleanup(ssh); |
Damien Miller | 01ed227 | 2008-11-05 16:20:46 +1100 | [diff] [blame] | 465 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 466 | free(authctxt->methoddata); |
| 467 | authctxt->methoddata = NULL; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 468 | if (authlist == NULL) { |
| 469 | authlist = authctxt->authlist; |
| 470 | } else { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 471 | free(authctxt->authlist); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 472 | authctxt->authlist = authlist; |
| 473 | } |
| 474 | for (;;) { |
| 475 | Authmethod *method = authmethod_get(authlist); |
| 476 | if (method == NULL) |
dtucker@openbsd.org | 4626e39 | 2017-06-14 00:31:38 +0000 | [diff] [blame] | 477 | fatal("%s@%s: Permission denied (%s).", |
| 478 | authctxt->server_user, authctxt->host, authlist); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 479 | authctxt->method = method; |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 480 | |
| 481 | /* reset the per method handler */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 482 | ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN, |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 483 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); |
| 484 | |
| 485 | /* and try new method */ |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 486 | if (method->userauth(ssh) != 0) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 487 | debug2("we sent a %s packet, wait for reply", method->name); |
| 488 | break; |
| 489 | } else { |
| 490 | debug2("we did not send a packet, disable method"); |
| 491 | method->enabled = NULL; |
| 492 | } |
| 493 | } |
| 494 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 495 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 496 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 497 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 498 | input_userauth_error(int type, u_int32_t seq, struct ssh *ssh) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 499 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 500 | fatal("%s: bad message during authentication: type %d", __func__, type); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 501 | return 0; |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 502 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 503 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 504 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 505 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 506 | input_userauth_banner(int type, u_int32_t seq, struct ssh *ssh) |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 507 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 508 | char *msg = NULL; |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 509 | size_t len; |
| 510 | int r; |
Darren Tucker | 7964482 | 2003-10-08 17:37:58 +1000 | [diff] [blame] | 511 | |
djm@openbsd.org | 65c6c6b | 2016-07-17 04:20:16 +0000 | [diff] [blame] | 512 | debug3("%s", __func__); |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 513 | if ((r = sshpkt_get_cstring(ssh, &msg, &len)) != 0 || |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 514 | (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0) |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 515 | goto out; |
djm@openbsd.org | 65c6c6b | 2016-07-17 04:20:16 +0000 | [diff] [blame] | 516 | if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) |
| 517 | fmprintf(stderr, "%s", msg); |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 518 | r = 0; |
| 519 | out: |
djm@openbsd.org | 65c6c6b | 2016-07-17 04:20:16 +0000 | [diff] [blame] | 520 | free(msg); |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 521 | return r; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 522 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 523 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 524 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 525 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 526 | input_userauth_success(int type, u_int32_t seq, struct ssh *ssh) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 527 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 528 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 529 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 530 | if (authctxt == NULL) |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 531 | fatal("%s: no authentication context", __func__); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 532 | free(authctxt->authlist); |
| 533 | authctxt->authlist = NULL; |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 534 | if (authctxt->method != NULL && authctxt->method->cleanup != NULL) |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 535 | authctxt->method->cleanup(ssh); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 536 | free(authctxt->methoddata); |
| 537 | authctxt->methoddata = NULL; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 538 | authctxt->success = 1; /* break out */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 539 | return 0; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 540 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 541 | |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 542 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 543 | 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] | 544 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 545 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 546 | |
| 547 | if (authctxt == NULL) |
| 548 | fatal("%s: no authentication context", __func__); |
| 549 | |
| 550 | fatal("Unexpected authentication success during %s.", |
| 551 | authctxt->method->name); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 552 | return 0; |
Darren Tucker | 2f29a8c | 2009-10-24 11:47:58 +1100 | [diff] [blame] | 553 | } |
| 554 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 555 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 556 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 557 | input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 558 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 559 | Authctxt *authctxt = ssh->authctxt; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 560 | char *authlist = NULL; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 561 | u_char partial; |
| 562 | int r; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 563 | |
| 564 | if (authctxt == NULL) |
| 565 | fatal("input_userauth_failure: no authentication context"); |
| 566 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 567 | if ((r = sshpkt_get_cstring(ssh, &authlist, NULL)) != 0 || |
| 568 | (r = sshpkt_get_u8(ssh, &partial)) != 0 || |
| 569 | (r = sshpkt_get_end(ssh)) != 0) |
| 570 | goto out; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 571 | |
Damien Miller | 62e9c4f | 2013-04-23 15:15:49 +1000 | [diff] [blame] | 572 | if (partial != 0) { |
dtucker@openbsd.org | 83cbca6 | 2016-07-22 05:46:11 +0000 | [diff] [blame] | 573 | verbose("Authenticated with partial success."); |
Damien Miller | 62e9c4f | 2013-04-23 15:15:49 +1000 | [diff] [blame] | 574 | /* reset state */ |
djm@openbsd.org | b9844a4 | 2016-12-04 23:54:02 +0000 | [diff] [blame] | 575 | pubkey_reset(authctxt); |
Damien Miller | 62e9c4f | 2013-04-23 15:15:49 +1000 | [diff] [blame] | 576 | } |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 577 | debug("Authentications that can continue: %s", authlist); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 578 | |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 579 | userauth(ssh, authlist); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 580 | authlist = NULL; |
| 581 | out: |
| 582 | free(authlist); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 583 | return 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 584 | } |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 585 | |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 586 | /* |
| 587 | * Format an identity for logging including filename, key type, fingerprint |
| 588 | * and location (agent, etc.). Caller must free. |
| 589 | */ |
| 590 | static char * |
| 591 | format_identity(Identity *id) |
| 592 | { |
| 593 | char *fp = NULL, *ret = NULL; |
| 594 | |
| 595 | if (id->key != NULL) { |
| 596 | fp = sshkey_fingerprint(id->key, options.fingerprint_hash, |
| 597 | SSH_FP_DEFAULT); |
| 598 | } |
| 599 | xasprintf(&ret, "%s %s%s%s%s%s%s", |
| 600 | id->filename, |
| 601 | id->key ? sshkey_type(id->key) : "", id->key ? " " : "", |
| 602 | fp ? fp : "", |
| 603 | id->userprovided ? " explicit" : "", |
| 604 | (id->key && (id->key->flags & SSHKEY_FLAG_EXT)) ? " token" : "", |
| 605 | id->agent_fd != -1 ? " agent" : ""); |
| 606 | free(fp); |
| 607 | return ret; |
| 608 | } |
| 609 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 610 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 611 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 612 | 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] | 613 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 614 | Authctxt *authctxt = ssh->authctxt; |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 615 | struct sshkey *key = NULL; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 616 | Identity *id = NULL; |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 617 | int pktype, found = 0, sent = 0; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 618 | size_t blen; |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 619 | char *pkalg = NULL, *fp = NULL, *ident = NULL; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 620 | u_char *pkblob = NULL; |
| 621 | int r; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 622 | |
| 623 | if (authctxt == NULL) |
| 624 | fatal("input_userauth_pk_ok: no authentication context"); |
djm@openbsd.org | 14b5c63 | 2018-01-23 05:27:21 +0000 | [diff] [blame] | 625 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 626 | if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 || |
| 627 | (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 || |
| 628 | (r = sshpkt_get_end(ssh)) != 0) |
| 629 | goto done; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 630 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 631 | if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) { |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 632 | debug("%s: server sent unknown pkalg %s", __func__, pkalg); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 633 | goto done; |
| 634 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 635 | if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) { |
| 636 | debug("no key from blob. pkalg %s: %s", pkalg, ssh_err(r)); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 637 | goto done; |
| 638 | } |
| 639 | if (key->type != pktype) { |
| 640 | error("input_userauth_pk_ok: type mismatch " |
| 641 | "for decoded key (received %d, expected %d)", |
| 642 | key->type, pktype); |
| 643 | goto done; |
| 644 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 645 | |
Darren Tucker | d05b601 | 2003-10-15 15:55:59 +1000 | [diff] [blame] | 646 | /* |
| 647 | * search keys in the reverse order, because last candidate has been |
| 648 | * moved to the end of the queue. this also avoids confusion by |
| 649 | * duplicate keys |
| 650 | */ |
Damien Miller | 0b51a52 | 2004-04-20 20:07:19 +1000 | [diff] [blame] | 651 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 652 | if (sshkey_equal(key, id->key)) { |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 653 | found = 1; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 654 | break; |
| 655 | } |
| 656 | } |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 657 | if (!found || id == NULL) { |
| 658 | fp = sshkey_fingerprint(key, options.fingerprint_hash, |
| 659 | SSH_FP_DEFAULT); |
| 660 | error("%s: server replied with unknown key: %s %s", __func__, |
| 661 | sshkey_type(key), fp == NULL ? "<ERROR>" : fp); |
| 662 | goto done; |
| 663 | } |
| 664 | ident = format_identity(id); |
| 665 | debug("Server accepts key: %s", ident); |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 666 | sent = sign_and_send_pubkey(ssh, id); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 667 | r = 0; |
| 668 | done: |
| 669 | sshkey_free(key); |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 670 | free(ident); |
| 671 | free(fp); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 672 | free(pkalg); |
| 673 | free(pkblob); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 674 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 675 | /* try another method if we did not send a packet */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 676 | if (r == 0 && sent == 0) |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 677 | userauth(ssh, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 678 | return r; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 679 | } |
| 680 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 681 | #ifdef GSSAPI |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 682 | int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 683 | userauth_gssapi(struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 684 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 685 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 686 | Gssctxt *gssctxt = NULL; |
Darren Tucker | 56afe14 | 2003-11-03 20:06:14 +1100 | [diff] [blame] | 687 | static gss_OID_set gss_supported = NULL; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 688 | static u_int mech = 0; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 689 | OM_uint32 min; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 690 | int r, ok = 0; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 691 | |
| 692 | /* Try one GSSAPI method at a time, rather than sending them all at |
| 693 | * once. */ |
| 694 | |
Darren Tucker | 56afe14 | 2003-11-03 20:06:14 +1100 | [diff] [blame] | 695 | if (gss_supported == NULL) |
| 696 | gss_indicate_mechs(&min, &gss_supported); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 697 | |
| 698 | /* Check to see if the mechanism is usable before we offer it */ |
Darren Tucker | 56afe14 | 2003-11-03 20:06:14 +1100 | [diff] [blame] | 699 | while (mech < gss_supported->count && !ok) { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 700 | /* My DER encoding requires length<128 */ |
Darren Tucker | 56afe14 | 2003-11-03 20:06:14 +1100 | [diff] [blame] | 701 | if (gss_supported->elements[mech].length < 128 && |
djm@openbsd.org | 84623e0 | 2018-06-26 02:02:36 +0000 | [diff] [blame] | 702 | ssh_gssapi_check_mechanism(&gssctxt, |
Damien Miller | a1cb9f3 | 2006-08-19 00:33:34 +1000 | [diff] [blame] | 703 | &gss_supported->elements[mech], authctxt->host)) { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 704 | ok = 1; /* Mechanism works */ |
| 705 | } else { |
| 706 | mech++; |
| 707 | } |
| 708 | } |
| 709 | |
Damien Miller | a1cb9f3 | 2006-08-19 00:33:34 +1000 | [diff] [blame] | 710 | if (!ok) |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 711 | return 0; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 712 | |
| 713 | authctxt->methoddata=(void *)gssctxt; |
| 714 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 715 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 716 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 717 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 718 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 719 | (r = sshpkt_put_u32(ssh, 1)) != 0 || |
| 720 | (r = sshpkt_put_u32(ssh, |
| 721 | (gss_supported->elements[mech].length) + 2)) != 0 || |
| 722 | (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 || |
| 723 | (r = sshpkt_put_u8(ssh, |
| 724 | gss_supported->elements[mech].length)) != 0 || |
| 725 | (r = sshpkt_put(ssh, |
| 726 | gss_supported->elements[mech].elements, |
| 727 | gss_supported->elements[mech].length)) != 0 || |
| 728 | (r = sshpkt_send(ssh)) != 0) |
| 729 | fatal("%s: %s", __func__, ssh_err(r)); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 730 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 731 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); |
| 732 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); |
| 733 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); |
| 734 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 735 | |
| 736 | mech++; /* Move along to next candidate */ |
| 737 | |
| 738 | return 1; |
| 739 | } |
| 740 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 741 | static OM_uint32 |
djm@openbsd.org | 39896b7 | 2017-05-31 05:08:46 +0000 | [diff] [blame] | 742 | process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok) |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 743 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 744 | Authctxt *authctxt = ssh->authctxt; |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 745 | Gssctxt *gssctxt = authctxt->methoddata; |
| 746 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
Damien Miller | da9984f | 2005-08-31 19:46:26 +1000 | [diff] [blame] | 747 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
| 748 | gss_buffer_desc gssbuf; |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 749 | OM_uint32 status, ms, flags; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 750 | int r; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 751 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 752 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 753 | recv_tok, &send_tok, &flags); |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 754 | |
| 755 | if (send_tok.length > 0) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 756 | u_char type = GSS_ERROR(status) ? |
| 757 | SSH2_MSG_USERAUTH_GSSAPI_ERRTOK : |
| 758 | SSH2_MSG_USERAUTH_GSSAPI_TOKEN; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 759 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 760 | if ((r = sshpkt_start(ssh, type)) != 0 || |
| 761 | (r = sshpkt_put_string(ssh, send_tok.value, |
| 762 | send_tok.length)) != 0 || |
| 763 | (r = sshpkt_send(ssh)) != 0) |
| 764 | fatal("%s: %s", __func__, ssh_err(r)); |
| 765 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 766 | gss_release_buffer(&ms, &send_tok); |
| 767 | } |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 768 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 769 | if (status == GSS_S_COMPLETE) { |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 770 | /* send either complete or MIC, depending on mechanism */ |
| 771 | if (!(flags & GSS_C_INTEG_FLAG)) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 772 | if ((r = sshpkt_start(ssh, |
| 773 | SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 || |
| 774 | (r = sshpkt_send(ssh)) != 0) |
| 775 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 776 | } else { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 777 | struct sshbuf *b; |
| 778 | |
| 779 | if ((b = sshbuf_new()) == NULL) |
| 780 | fatal("%s: sshbuf_new failed", __func__); |
| 781 | ssh_gssapi_buildmic(b, authctxt->server_user, |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 782 | authctxt->service, "gssapi-with-mic"); |
| 783 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 784 | if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL) |
| 785 | fatal("%s: sshbuf_mutable_ptr failed", __func__); |
| 786 | gssbuf.length = sshbuf_len(b); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 787 | |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 788 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 789 | |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 790 | if (!GSS_ERROR(status)) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 791 | if ((r = sshpkt_start(ssh, |
| 792 | SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 || |
| 793 | (r = sshpkt_put_string(ssh, mic.value, |
| 794 | mic.length)) != 0 || |
| 795 | (r = sshpkt_send(ssh)) != 0) |
| 796 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 797 | } |
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 | sshbuf_free(b); |
Damien Miller | 0425d40 | 2003-11-17 22:18:21 +1100 | [diff] [blame] | 800 | gss_release_buffer(&ms, &mic); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 801 | } |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 802 | } |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 803 | |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 804 | return status; |
| 805 | } |
| 806 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 807 | /* ARGSUSED */ |
djm@openbsd.org | 12b5f50 | 2015-01-20 07:56:44 +0000 | [diff] [blame] | 808 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 809 | input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 810 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 811 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 812 | Gssctxt *gssctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 813 | size_t oidlen; |
| 814 | u_char *oidv = NULL; |
| 815 | int r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 816 | |
| 817 | if (authctxt == NULL) |
| 818 | fatal("input_gssapi_response: no authentication context"); |
| 819 | gssctxt = authctxt->methoddata; |
| 820 | |
| 821 | /* Setup our OID */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 822 | if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0) |
| 823 | goto done; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 824 | |
Darren Tucker | 655a5e0 | 2003-11-03 20:09:03 +1100 | [diff] [blame] | 825 | if (oidlen <= 2 || |
| 826 | oidv[0] != SSH_GSS_OIDTYPE || |
| 827 | oidv[1] != oidlen - 2) { |
| 828 | debug("Badly encoded mechanism OID received"); |
| 829 | userauth(authctxt, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 830 | goto ok; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 831 | } |
| 832 | |
Darren Tucker | 655a5e0 | 2003-11-03 20:09:03 +1100 | [diff] [blame] | 833 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
| 834 | fatal("Server returned different OID than expected"); |
| 835 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 836 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 837 | goto done; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 838 | |
djm@openbsd.org | 39896b7 | 2017-05-31 05:08:46 +0000 | [diff] [blame] | 839 | if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 840 | /* Start again with next method on list */ |
| 841 | debug("Trying to start again"); |
| 842 | userauth(authctxt, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 843 | goto ok; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 844 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 845 | ok: |
| 846 | r = 0; |
| 847 | done: |
| 848 | free(oidv); |
| 849 | return r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 850 | } |
| 851 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 852 | /* ARGSUSED */ |
djm@openbsd.org | 12b5f50 | 2015-01-20 07:56:44 +0000 | [diff] [blame] | 853 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 854 | input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 855 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 856 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 857 | gss_buffer_desc recv_tok; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 858 | u_char *p = NULL; |
| 859 | size_t len; |
Damien Miller | 91c6aa4 | 2003-11-17 21:20:18 +1100 | [diff] [blame] | 860 | OM_uint32 status; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 861 | int r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 862 | |
| 863 | if (authctxt == NULL) |
| 864 | fatal("input_gssapi_response: no authentication context"); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 865 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 866 | if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 || |
| 867 | (r = sshpkt_get_end(ssh)) != 0) |
| 868 | goto out; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 869 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 870 | recv_tok.value = p; |
| 871 | recv_tok.length = len; |
djm@openbsd.org | 39896b7 | 2017-05-31 05:08:46 +0000 | [diff] [blame] | 872 | status = process_gssapi_token(ssh, &recv_tok); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 873 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 874 | /* Start again with the next method in the list */ |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 875 | if (GSS_ERROR(status)) { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 876 | userauth(authctxt, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 877 | /* ok */ |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 878 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 879 | r = 0; |
| 880 | out: |
| 881 | free(p); |
| 882 | return r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 883 | } |
| 884 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 885 | /* ARGSUSED */ |
djm@openbsd.org | 12b5f50 | 2015-01-20 07:56:44 +0000 | [diff] [blame] | 886 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 887 | input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 888 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 889 | Authctxt *authctxt = ssh->authctxt; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 890 | Gssctxt *gssctxt; |
| 891 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 892 | gss_buffer_desc recv_tok; |
Damien Miller | d677ad1 | 2013-04-23 15:18:51 +1000 | [diff] [blame] | 893 | OM_uint32 ms; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 894 | u_char *p = NULL; |
| 895 | size_t len; |
| 896 | int r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 897 | |
| 898 | if (authctxt == NULL) |
| 899 | fatal("input_gssapi_response: no authentication context"); |
| 900 | gssctxt = authctxt->methoddata; |
| 901 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 902 | if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 || |
| 903 | (r = sshpkt_get_end(ssh)) != 0) { |
| 904 | free(p); |
| 905 | return r; |
| 906 | } |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 907 | |
| 908 | /* Stick it into GSSAPI and see what it says */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 909 | recv_tok.value = p; |
| 910 | recv_tok.length = len; |
Damien Miller | d677ad1 | 2013-04-23 15:18:51 +1000 | [diff] [blame] | 911 | (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 912 | &recv_tok, &send_tok, NULL); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 913 | free(p); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 914 | gss_release_buffer(&ms, &send_tok); |
| 915 | |
| 916 | /* Server will be returning a failed packet after this one */ |
djm@openbsd.org | 12b5f50 | 2015-01-20 07:56:44 +0000 | [diff] [blame] | 917 | return 0; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 918 | } |
| 919 | |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 920 | /* ARGSUSED */ |
djm@openbsd.org | 12b5f50 | 2015-01-20 07:56:44 +0000 | [diff] [blame] | 921 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 922 | input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh) |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 923 | { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 924 | char *msg = NULL; |
| 925 | char *lang = NULL; |
| 926 | int r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 927 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 928 | if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* maj */ |
| 929 | (r = sshpkt_get_u32(ssh, NULL)) != 0 || /* min */ |
| 930 | (r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 || |
| 931 | (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0) |
| 932 | goto out; |
| 933 | r = sshpkt_get_end(ssh); |
Damien Miller | 15d72a0 | 2005-11-05 15:07:33 +1100 | [diff] [blame] | 934 | debug("Server GSSAPI Error:\n%s", msg); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 935 | out: |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 936 | free(msg); |
| 937 | free(lang); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 938 | return r; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 939 | } |
| 940 | #endif /* GSSAPI */ |
| 941 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 942 | int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 943 | userauth_none(struct ssh *ssh) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 944 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 945 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 946 | int r; |
| 947 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 948 | /* initial userauth request */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 949 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 950 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 951 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 952 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 953 | (r = sshpkt_send(ssh)) != 0) |
| 954 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 955 | return 1; |
| 956 | } |
| 957 | |
| 958 | int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 959 | userauth_passwd(struct ssh *ssh) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 960 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 961 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
djm@openbsd.org | 91b1919 | 2018-11-28 06:00:38 +0000 | [diff] [blame] | 962 | char *password, *prompt = NULL; |
Darren Tucker | ab79169 | 2010-01-08 18:48:02 +1100 | [diff] [blame] | 963 | const char *host = options.host_key_alias ? options.host_key_alias : |
| 964 | authctxt->host; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 965 | int r; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 966 | |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 967 | if (authctxt->attempt_passwd++ >= options.number_of_password_prompts) |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 968 | return 0; |
| 969 | |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 970 | if (authctxt->attempt_passwd != 1) |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 971 | error("Permission denied, please try again."); |
| 972 | |
djm@openbsd.org | 91b1919 | 2018-11-28 06:00:38 +0000 | [diff] [blame] | 973 | xasprintf(&prompt, "%s@%s's password: ", authctxt->server_user, host); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 974 | password = read_passphrase(prompt, 0); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 975 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 976 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 977 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 978 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 979 | (r = sshpkt_put_u8(ssh, 0)) != 0 || |
| 980 | (r = sshpkt_put_cstring(ssh, password)) != 0 || |
| 981 | (r = sshpkt_add_padding(ssh, 64)) != 0 || |
| 982 | (r = sshpkt_send(ssh)) != 0) |
| 983 | fatal("%s: %s", __func__, ssh_err(r)); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 984 | |
djm@openbsd.org | 91b1919 | 2018-11-28 06:00:38 +0000 | [diff] [blame] | 985 | free(prompt); |
| 986 | if (password != NULL) |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 987 | freezero(password, strlen(password)); |
| 988 | |
| 989 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 990 | &input_userauth_passwd_changereq); |
| 991 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 992 | return 1; |
| 993 | } |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 994 | |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 995 | /* |
| 996 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST |
| 997 | */ |
Damien Miller | f7475d7 | 2008-11-03 19:26:18 +1100 | [diff] [blame] | 998 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 999 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 1000 | 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] | 1001 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 1002 | Authctxt *authctxt = ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1003 | char *info = NULL, *lang = NULL, *password = NULL, *retype = NULL; |
dtucker@openbsd.org | a54eb27 | 2017-08-27 00:38:41 +0000 | [diff] [blame] | 1004 | char prompt[256]; |
djm@openbsd.org | 3e032a9 | 2017-01-30 00:32:03 +0000 | [diff] [blame] | 1005 | const char *host; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1006 | int r; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1007 | |
| 1008 | debug2("input_userauth_passwd_changereq"); |
| 1009 | |
| 1010 | if (authctxt == NULL) |
| 1011 | fatal("input_userauth_passwd_changereq: " |
| 1012 | "no authentication context"); |
djm@openbsd.org | 3e032a9 | 2017-01-30 00:32:03 +0000 | [diff] [blame] | 1013 | host = options.host_key_alias ? options.host_key_alias : authctxt->host; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1014 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1015 | if ((r = sshpkt_get_cstring(ssh, &info, NULL)) != 0 || |
| 1016 | (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0) |
| 1017 | goto out; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1018 | if (strlen(info) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1019 | logit("%s", info); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1020 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1021 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1022 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1023 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1024 | (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */ |
| 1025 | goto out; |
| 1026 | |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 1027 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1028 | "Enter %.30s@%.128s's old password: ", |
Darren Tucker | ab79169 | 2010-01-08 18:48:02 +1100 | [diff] [blame] | 1029 | authctxt->server_user, host); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1030 | password = read_passphrase(prompt, 0); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1031 | if ((r = sshpkt_put_cstring(ssh, password)) != 0) |
| 1032 | goto out; |
| 1033 | |
| 1034 | freezero(password, strlen(password)); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1035 | password = NULL; |
| 1036 | while (password == NULL) { |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 1037 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1038 | "Enter %.30s@%.128s's new password: ", |
Darren Tucker | ab79169 | 2010-01-08 18:48:02 +1100 | [diff] [blame] | 1039 | authctxt->server_user, host); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1040 | password = read_passphrase(prompt, RP_ALLOW_EOF); |
| 1041 | if (password == NULL) { |
| 1042 | /* bail out */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1043 | r = 0; |
| 1044 | goto out; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1045 | } |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 1046 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1047 | "Retype %.30s@%.128s's new password: ", |
Darren Tucker | ab79169 | 2010-01-08 18:48:02 +1100 | [diff] [blame] | 1048 | authctxt->server_user, host); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1049 | retype = read_passphrase(prompt, 0); |
| 1050 | if (strcmp(password, retype) != 0) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1051 | freezero(password, strlen(password)); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1052 | logit("Mismatch; try again, EOF to quit."); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1053 | password = NULL; |
| 1054 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1055 | freezero(retype, strlen(retype)); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1056 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1057 | if ((r = sshpkt_put_cstring(ssh, password)) != 0 || |
| 1058 | (r = sshpkt_add_padding(ssh, 64)) != 0 || |
| 1059 | (r = sshpkt_send(ssh)) != 0) |
| 1060 | goto out; |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 1061 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1062 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1063 | &input_userauth_passwd_changereq); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1064 | r = 0; |
| 1065 | out: |
| 1066 | if (password) |
| 1067 | freezero(password, strlen(password)); |
| 1068 | free(info); |
| 1069 | free(lang); |
| 1070 | return r; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 1071 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1072 | |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1073 | /* |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1074 | * Select an algorithm for publickey signatures. |
| 1075 | * Returns algorithm (caller must free) or NULL if no mutual algorithm found. |
| 1076 | * |
| 1077 | * Call with ssh==NULL to ignore server-sig-algs extension list and |
| 1078 | * only attempt with the key's base signature type. |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1079 | */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1080 | static char * |
| 1081 | key_sig_algorithm(struct ssh *ssh, const struct sshkey *key) |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1082 | { |
djm@openbsd.org | b4d4eda | 2018-07-03 13:20:25 +0000 | [diff] [blame] | 1083 | char *allowed, *oallowed, *cp, *tmp, *alg = NULL; |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1084 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1085 | /* |
| 1086 | * The signature algorithm will only differ from the key algorithm |
| 1087 | * for RSA keys/certs and when the server advertises support for |
| 1088 | * newer (SHA2) algorithms. |
| 1089 | */ |
| 1090 | if (ssh == NULL || ssh->kex->server_sig_algs == NULL || |
djm@openbsd.org | 1a4a9cf | 2018-10-11 03:48:04 +0000 | [diff] [blame] | 1091 | (key->type != KEY_RSA && key->type != KEY_RSA_CERT) || |
| 1092 | (key->type == KEY_RSA_CERT && (datafellows & SSH_BUG_SIGTYPE))) { |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1093 | /* Filter base key signature alg against our configuration */ |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1094 | return match_list(sshkey_ssh_name(key), |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1095 | options.pubkey_key_types, NULL); |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1096 | } |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1097 | |
| 1098 | /* |
| 1099 | * For RSA keys/certs, since these might have a different sig type: |
| 1100 | * find the first entry in PubkeyAcceptedKeyTypes of the right type |
| 1101 | * that also appears in the supported signature algorithms list from |
| 1102 | * the server. |
| 1103 | */ |
| 1104 | oallowed = allowed = xstrdup(options.pubkey_key_types); |
| 1105 | while ((cp = strsep(&allowed, ",")) != NULL) { |
| 1106 | if (sshkey_type_from_name(cp) != key->type) |
| 1107 | continue; |
djm@openbsd.org | b4d4eda | 2018-07-03 13:20:25 +0000 | [diff] [blame] | 1108 | tmp = match_list(sshkey_sigalg_by_name(cp), ssh->kex->server_sig_algs, NULL); |
| 1109 | if (tmp != NULL) |
| 1110 | alg = xstrdup(cp); |
| 1111 | free(tmp); |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1112 | if (alg != NULL) |
| 1113 | break; |
| 1114 | } |
| 1115 | free(oallowed); |
| 1116 | return alg; |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1117 | } |
| 1118 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1119 | static int |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1120 | identity_sign(struct identity *id, u_char **sigp, size_t *lenp, |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1121 | 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] | 1122 | { |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1123 | struct sshkey *prv; |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1124 | int r; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1125 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1126 | /* The agent supports this key. */ |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1127 | if (id->key != NULL && id->agent_fd != -1) { |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1128 | return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp, |
| 1129 | data, datalen, alg, compat); |
| 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * We have already loaded the private key or the private key is |
| 1134 | * stored in external hardware. |
| 1135 | */ |
| 1136 | if (id->key != NULL && |
| 1137 | (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))) { |
| 1138 | if ((r = sshkey_sign(id->key, sigp, lenp, data, datalen, |
| 1139 | alg, compat)) != 0) |
| 1140 | return r; |
| 1141 | /* |
| 1142 | * PKCS#11 tokens may not support all signature algorithms, |
| 1143 | * so check what we get back. |
| 1144 | */ |
| 1145 | if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0) |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1146 | return r; |
| 1147 | return 0; |
| 1148 | } |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1149 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1150 | /* Load the private key from the file. */ |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1151 | if ((prv = load_identity_file(id)) == NULL) |
djm@openbsd.org | 0d1451a | 2016-02-23 01:34:14 +0000 | [diff] [blame] | 1152 | return SSH_ERR_KEY_NOT_FOUND; |
djm@openbsd.org | c4972d0 | 2017-08-11 04:47:12 +0000 | [diff] [blame] | 1153 | if (id->key != NULL && !sshkey_equal_public(prv, id->key)) { |
| 1154 | error("%s: private key %s contents do not match public", |
| 1155 | __func__, id->filename); |
| 1156 | return SSH_ERR_KEY_NOT_FOUND; |
| 1157 | } |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1158 | r = sshkey_sign(prv, sigp, lenp, data, datalen, alg, compat); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1159 | sshkey_free(prv); |
djm@openbsd.org | 2607438 | 2018-03-03 03:01:50 +0000 | [diff] [blame] | 1160 | return r; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1161 | } |
| 1162 | |
| 1163 | static int |
djm@openbsd.org | 1e24552 | 2017-03-11 23:40:26 +0000 | [diff] [blame] | 1164 | id_filename_matches(Identity *id, Identity *private_id) |
| 1165 | { |
| 1166 | const char *suffixes[] = { ".pub", "-cert.pub", NULL }; |
| 1167 | size_t len = strlen(id->filename), plen = strlen(private_id->filename); |
| 1168 | size_t i, slen; |
| 1169 | |
| 1170 | if (strcmp(id->filename, private_id->filename) == 0) |
| 1171 | return 1; |
| 1172 | for (i = 0; suffixes[i]; i++) { |
| 1173 | slen = strlen(suffixes[i]); |
| 1174 | if (len > slen && plen == len - slen && |
| 1175 | strcmp(id->filename + (len - slen), suffixes[i]) == 0 && |
| 1176 | memcmp(id->filename, private_id->filename, plen) == 0) |
| 1177 | return 1; |
| 1178 | } |
| 1179 | return 0; |
| 1180 | } |
| 1181 | |
| 1182 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1183 | sign_and_send_pubkey(struct ssh *ssh, Identity *id) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1184 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1185 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1186 | struct sshbuf *b = NULL; |
| 1187 | Identity *private_id, *sign_id = NULL; |
| 1188 | u_char *signature = NULL; |
| 1189 | size_t slen = 0, skip = 0; |
| 1190 | int r, fallback_sigtype, sent = 0; |
| 1191 | char *alg = NULL, *fp = NULL; |
| 1192 | const char *loc = ""; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1193 | |
djm@openbsd.org | 9ce86c9 | 2015-01-28 22:36:00 +0000 | [diff] [blame] | 1194 | if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash, |
| 1195 | SSH_FP_DEFAULT)) == NULL) |
| 1196 | return 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1197 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1198 | debug3("%s: %s %s", __func__, sshkey_type(id->key), fp); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1199 | |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1200 | /* |
| 1201 | * If the key is an certificate, try to find a matching private key |
| 1202 | * and use it to complete the signature. |
djm@openbsd.org | 9ee692f | 2016-04-28 14:30:21 +0000 | [diff] [blame] | 1203 | * If no such private key exists, fall back to trying the certificate |
| 1204 | * key itself in case it has a private half already loaded. |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1205 | * This will try to set sign_id to the private key that will perform |
| 1206 | * the signature. |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1207 | */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1208 | if (sshkey_is_cert(id->key)) { |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1209 | TAILQ_FOREACH(private_id, &authctxt->keys, next) { |
| 1210 | if (sshkey_equal_public(id->key, private_id->key) && |
| 1211 | id->key->type != private_id->key->type) { |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1212 | sign_id = private_id; |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1213 | break; |
| 1214 | } |
| 1215 | } |
djm@openbsd.org | 1e24552 | 2017-03-11 23:40:26 +0000 | [diff] [blame] | 1216 | /* |
| 1217 | * Exact key matches are preferred, but also allow |
| 1218 | * filename matches for non-PKCS#11/agent keys that |
| 1219 | * didn't load public keys. This supports the case |
| 1220 | * of keeping just a private key file and public |
| 1221 | * certificate on disk. |
| 1222 | */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1223 | if (sign_id == NULL && |
| 1224 | !id->isprivate && id->agent_fd == -1 && |
djm@openbsd.org | 1e24552 | 2017-03-11 23:40:26 +0000 | [diff] [blame] | 1225 | (id->key->flags & SSHKEY_FLAG_EXT) == 0) { |
| 1226 | TAILQ_FOREACH(private_id, &authctxt->keys, next) { |
| 1227 | if (private_id->key == NULL && |
| 1228 | id_filename_matches(id, private_id)) { |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1229 | sign_id = private_id; |
djm@openbsd.org | 1e24552 | 2017-03-11 23:40:26 +0000 | [diff] [blame] | 1230 | break; |
| 1231 | } |
| 1232 | } |
| 1233 | } |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1234 | if (sign_id != NULL) { |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1235 | debug2("%s: using private key \"%s\"%s for " |
| 1236 | "certificate", __func__, id->filename, |
| 1237 | id->agent_fd != -1 ? " from agent" : ""); |
| 1238 | } else { |
djm@openbsd.org | c38905b | 2016-03-14 16:20:54 +0000 | [diff] [blame] | 1239 | debug("%s: no separate private key for certificate " |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1240 | "\"%s\"", __func__, id->filename); |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1241 | } |
| 1242 | } |
| 1243 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1244 | /* |
| 1245 | * If the above didn't select another identity to do the signing |
| 1246 | * then default to the one we started with. |
| 1247 | */ |
| 1248 | if (sign_id == NULL) |
| 1249 | sign_id = id; |
| 1250 | |
| 1251 | /* assemble and sign data */ |
| 1252 | for (fallback_sigtype = 0; fallback_sigtype <= 1; fallback_sigtype++) { |
| 1253 | free(alg); |
| 1254 | slen = 0; |
| 1255 | signature = NULL; |
| 1256 | if ((alg = key_sig_algorithm(fallback_sigtype ? NULL : ssh, |
| 1257 | id->key)) == NULL) { |
| 1258 | error("%s: no mutual signature supported", __func__); |
| 1259 | goto out; |
| 1260 | } |
| 1261 | debug3("%s: signing using %s", __func__, alg); |
| 1262 | |
| 1263 | sshbuf_free(b); |
| 1264 | if ((b = sshbuf_new()) == NULL) |
| 1265 | fatal("%s: sshbuf_new failed", __func__); |
| 1266 | if (datafellows & SSH_OLD_SESSIONID) { |
| 1267 | if ((r = sshbuf_put(b, session_id2, |
| 1268 | session_id2_len)) != 0) { |
| 1269 | fatal("%s: sshbuf_put: %s", |
| 1270 | __func__, ssh_err(r)); |
| 1271 | } |
| 1272 | } else { |
| 1273 | if ((r = sshbuf_put_string(b, session_id2, |
| 1274 | session_id2_len)) != 0) { |
| 1275 | fatal("%s: sshbuf_put_string: %s", |
| 1276 | __func__, ssh_err(r)); |
| 1277 | } |
| 1278 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1279 | skip = sshbuf_len(b); |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1280 | if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1281 | (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 || |
| 1282 | (r = sshbuf_put_cstring(b, authctxt->service)) != 0 || |
| 1283 | (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 || |
| 1284 | (r = sshbuf_put_u8(b, 1)) != 0 || |
| 1285 | (r = sshbuf_put_cstring(b, alg)) != 0 || |
| 1286 | (r = sshkey_puts(id->key, b)) != 0) { |
| 1287 | fatal("%s: assemble signed data: %s", |
| 1288 | __func__, ssh_err(r)); |
| 1289 | } |
| 1290 | |
| 1291 | /* generate signature */ |
| 1292 | r = identity_sign(sign_id, &signature, &slen, |
| 1293 | sshbuf_ptr(b), sshbuf_len(b), datafellows, alg); |
| 1294 | if (r == 0) |
| 1295 | break; |
| 1296 | else if (r == SSH_ERR_KEY_NOT_FOUND) |
| 1297 | goto out; /* soft failure */ |
| 1298 | else if (r == SSH_ERR_SIGN_ALG_UNSUPPORTED && |
| 1299 | !fallback_sigtype) { |
| 1300 | if (sign_id->agent_fd != -1) |
| 1301 | loc = "agent "; |
| 1302 | else if ((sign_id->key->flags & SSHKEY_FLAG_EXT) != 0) |
| 1303 | loc = "token "; |
| 1304 | logit("%skey %s %s returned incorrect signature type", |
| 1305 | loc, sshkey_type(id->key), fp); |
| 1306 | continue; |
| 1307 | } |
| 1308 | error("%s: signing failed: %s", __func__, ssh_err(r)); |
| 1309 | goto out; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1310 | } |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1311 | if (slen == 0 || signature == NULL) /* shouldn't happen */ |
| 1312 | fatal("%s: no signature", __func__); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1313 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1314 | /* append signature */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1315 | if ((r = sshbuf_put_string(b, signature, slen)) != 0) |
| 1316 | fatal("%s: append signature: %s", __func__, ssh_err(r)); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1317 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1318 | #ifdef DEBUG_PK |
| 1319 | sshbuf_dump(b, stderr); |
| 1320 | #endif |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1321 | /* skip session id and packet type */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1322 | if ((r = sshbuf_consume(b, skip + 1)) != 0) |
| 1323 | fatal("%s: consume: %s", __func__, ssh_err(r)); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1324 | |
| 1325 | /* put remaining data from buffer into packet */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1326 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1327 | (r = sshpkt_putb(ssh, b)) != 0 || |
| 1328 | (r = sshpkt_send(ssh)) != 0) |
| 1329 | fatal("%s: enqueue request: %s", __func__, ssh_err(r)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1330 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1331 | /* success */ |
| 1332 | sent = 1; |
| 1333 | |
| 1334 | out: |
| 1335 | free(fp); |
| 1336 | free(alg); |
| 1337 | sshbuf_free(b); |
| 1338 | freezero(signature, slen); |
| 1339 | return sent; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1340 | } |
| 1341 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1342 | static int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1343 | send_pubkey_test(struct ssh *ssh, Identity *id) |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1344 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1345 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1346 | u_char *blob = NULL; |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1347 | char *alg = NULL; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1348 | size_t bloblen; |
| 1349 | u_int have_sig = 0; |
| 1350 | int sent = 0, r; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1351 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1352 | if ((alg = key_sig_algorithm(ssh, id->key)) == NULL) { |
| 1353 | debug("%s: no mutual signature algorithm", __func__); |
| 1354 | goto out; |
| 1355 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1356 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1357 | if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1358 | /* we cannot handle this key */ |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1359 | debug3("%s: cannot handle key", __func__); |
| 1360 | goto out; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1361 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1362 | /* register callback for USERAUTH_PK_OK message */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1363 | 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] | 1364 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1365 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1366 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1367 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1368 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1369 | (r = sshpkt_put_u8(ssh, have_sig)) != 0 || |
| 1370 | (r = sshpkt_put_cstring(ssh, alg)) != 0 || |
| 1371 | (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 || |
| 1372 | (r = sshpkt_send(ssh)) != 0) |
| 1373 | fatal("%s: %s", __func__, ssh_err(r)); |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1374 | sent = 1; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1375 | |
| 1376 | out: |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1377 | free(alg); |
| 1378 | free(blob); |
| 1379 | return sent; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1380 | } |
| 1381 | |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1382 | static struct sshkey * |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1383 | load_identity_file(Identity *id) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1384 | { |
markus@openbsd.org | 54d90ac | 2017-05-30 08:52:19 +0000 | [diff] [blame] | 1385 | struct sshkey *private = NULL; |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1386 | char prompt[300], *passphrase, *comment; |
djm@openbsd.org | f14564c | 2015-01-15 11:04:36 +0000 | [diff] [blame] | 1387 | int r, perm_ok = 0, quit = 0, i; |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 1388 | struct stat st; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1389 | |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1390 | if (stat(id->filename, &st) < 0) { |
| 1391 | (id->userprovided ? logit : debug3)("no such identity: %s: %s", |
| 1392 | id->filename, strerror(errno)); |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 1393 | return NULL; |
| 1394 | } |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1395 | snprintf(prompt, sizeof prompt, |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1396 | "Enter passphrase for key '%.100s': ", id->filename); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1397 | for (i = 0; i <= options.number_of_password_prompts; i++) { |
| 1398 | if (i == 0) |
| 1399 | passphrase = ""; |
| 1400 | else { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1401 | passphrase = read_passphrase(prompt, 0); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1402 | if (*passphrase == '\0') { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1403 | debug2("no passphrase given, try next key"); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1404 | free(passphrase); |
| 1405 | break; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1406 | } |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1407 | } |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1408 | switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename, |
| 1409 | passphrase, &private, &comment, &perm_ok))) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1410 | case 0: |
| 1411 | break; |
| 1412 | case SSH_ERR_KEY_WRONG_PASSPHRASE: |
| 1413 | if (options.batch_mode) { |
| 1414 | quit = 1; |
| 1415 | break; |
| 1416 | } |
djm@openbsd.org | f14564c | 2015-01-15 11:04:36 +0000 | [diff] [blame] | 1417 | if (i != 0) |
| 1418 | debug2("bad passphrase given, try again..."); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1419 | break; |
| 1420 | case SSH_ERR_SYSTEM_ERROR: |
| 1421 | if (errno == ENOENT) { |
| 1422 | debug2("Load key \"%s\": %s", |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1423 | id->filename, ssh_err(r)); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1424 | quit = 1; |
| 1425 | break; |
| 1426 | } |
| 1427 | /* FALLTHROUGH */ |
| 1428 | default: |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1429 | error("Load key \"%s\": %s", id->filename, ssh_err(r)); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1430 | quit = 1; |
| 1431 | break; |
| 1432 | } |
djm@openbsd.org | 6064a8b | 2015-12-04 00:24:55 +0000 | [diff] [blame] | 1433 | if (!quit && private != NULL && id->agent_fd == -1 && |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1434 | !(id->key && id->isprivate)) |
| 1435 | maybe_add_key_to_agent(id->filename, private, comment, |
| 1436 | passphrase); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1437 | if (i > 0) |
| 1438 | freezero(passphrase, strlen(passphrase)); |
mmcc@openbsd.org | d59ce08 | 2015-12-10 17:08:40 +0000 | [diff] [blame] | 1439 | free(comment); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1440 | if (private != NULL || quit) |
| 1441 | break; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 1442 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1443 | return private; |
| 1444 | } |
| 1445 | |
djm@openbsd.org | 4ba0d54 | 2018-07-03 11:39:54 +0000 | [diff] [blame] | 1446 | static int |
| 1447 | key_type_allowed_by_config(struct sshkey *key) |
| 1448 | { |
| 1449 | if (match_pattern_list(sshkey_ssh_name(key), |
| 1450 | options.pubkey_key_types, 0) == 1) |
| 1451 | return 1; |
| 1452 | |
| 1453 | /* RSA keys/certs might be allowed by alternate signature types */ |
| 1454 | switch (key->type) { |
| 1455 | case KEY_RSA: |
| 1456 | if (match_pattern_list("rsa-sha2-512", |
| 1457 | options.pubkey_key_types, 0) == 1) |
| 1458 | return 1; |
| 1459 | if (match_pattern_list("rsa-sha2-256", |
| 1460 | options.pubkey_key_types, 0) == 1) |
| 1461 | return 1; |
| 1462 | break; |
| 1463 | case KEY_RSA_CERT: |
| 1464 | if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com", |
| 1465 | options.pubkey_key_types, 0) == 1) |
| 1466 | return 1; |
| 1467 | if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com", |
| 1468 | options.pubkey_key_types, 0) == 1) |
| 1469 | return 1; |
| 1470 | break; |
| 1471 | } |
| 1472 | return 0; |
| 1473 | } |
| 1474 | |
| 1475 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1476 | /* |
| 1477 | * try keys in the following order: |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1478 | * 1. certificates listed in the config file |
| 1479 | * 2. other input certificates |
| 1480 | * 3. agent keys that are found in the config file |
| 1481 | * 4. other agent keys |
| 1482 | * 5. keys that are only listed in the config file |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1483 | */ |
| 1484 | static void |
| 1485 | pubkey_prepare(Authctxt *authctxt) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1486 | { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1487 | struct identity *id, *id2, *tmp; |
| 1488 | struct idlist agent, files, *preferred; |
| 1489 | struct sshkey *key; |
djm@openbsd.org | 6064a8b | 2015-12-04 00:24:55 +0000 | [diff] [blame] | 1490 | int agent_fd = -1, i, r, found; |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1491 | size_t j; |
| 1492 | struct ssh_identitylist *idlist; |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 1493 | char *ident; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1494 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1495 | TAILQ_INIT(&agent); /* keys from the agent */ |
| 1496 | TAILQ_INIT(&files); /* keys from the config file */ |
| 1497 | preferred = &authctxt->keys; |
| 1498 | TAILQ_INIT(preferred); /* preferred order of keys */ |
| 1499 | |
Damien Miller | cb6b68b | 2012-12-03 09:49:52 +1100 | [diff] [blame] | 1500 | /* list of keys stored in the filesystem and PKCS#11 */ |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1501 | for (i = 0; i < options.num_identity_files; i++) { |
| 1502 | key = options.identity_keys[i]; |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 1503 | if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER) |
| 1504 | continue; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1505 | options.identity_keys[i] = NULL; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1506 | id = xcalloc(1, sizeof(*id)); |
djm@openbsd.org | 6064a8b | 2015-12-04 00:24:55 +0000 | [diff] [blame] | 1507 | id->agent_fd = -1; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1508 | id->key = key; |
| 1509 | id->filename = xstrdup(options.identity_files[i]); |
Darren Tucker | 1910478 | 2013-04-05 11:13:08 +1100 | [diff] [blame] | 1510 | id->userprovided = options.identity_file_userprovided[i]; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1511 | TAILQ_INSERT_TAIL(&files, id, next); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1512 | } |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1513 | /* list of certificates specified by user */ |
| 1514 | for (i = 0; i < options.num_certificate_files; i++) { |
| 1515 | key = options.certificates[i]; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1516 | if (!sshkey_is_cert(key) || key->cert == NULL || |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1517 | key->cert->type != SSH2_CERT_TYPE_USER) |
| 1518 | continue; |
| 1519 | id = xcalloc(1, sizeof(*id)); |
djm@openbsd.org | 6064a8b | 2015-12-04 00:24:55 +0000 | [diff] [blame] | 1520 | id->agent_fd = -1; |
djm@openbsd.org | 4e44a79 | 2015-09-24 06:15:11 +0000 | [diff] [blame] | 1521 | id->key = key; |
| 1522 | id->filename = xstrdup(options.certificate_files[i]); |
| 1523 | id->userprovided = options.certificate_file_userprovided[i]; |
| 1524 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1525 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1526 | /* list of keys supported by the agent */ |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1527 | if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) { |
| 1528 | if (r != SSH_ERR_AGENT_NOT_PRESENT) |
| 1529 | debug("%s: ssh_get_authentication_socket: %s", |
| 1530 | __func__, ssh_err(r)); |
naddy@openbsd.org | 3e371bd | 2017-05-05 10:42:49 +0000 | [diff] [blame] | 1531 | } else if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1532 | if (r != SSH_ERR_AGENT_NO_IDENTITIES) |
| 1533 | debug("%s: ssh_fetch_identitylist: %s", |
| 1534 | __func__, ssh_err(r)); |
markus@openbsd.org | fc77ccd | 2016-01-14 22:56:56 +0000 | [diff] [blame] | 1535 | close(agent_fd); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1536 | } else { |
| 1537 | for (j = 0; j < idlist->nkeys; j++) { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1538 | found = 0; |
| 1539 | TAILQ_FOREACH(id, &files, next) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1540 | /* |
| 1541 | * agent keys from the config file are |
| 1542 | * preferred |
| 1543 | */ |
| 1544 | if (sshkey_equal(idlist->keys[j], id->key)) { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1545 | TAILQ_REMOVE(&files, id, next); |
| 1546 | TAILQ_INSERT_TAIL(preferred, id, next); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1547 | id->agent_fd = agent_fd; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1548 | found = 1; |
| 1549 | break; |
| 1550 | } |
| 1551 | } |
Damien Miller | bd394c3 | 2004-03-08 23:12:36 +1100 | [diff] [blame] | 1552 | if (!found && !options.identities_only) { |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 1553 | id = xcalloc(1, sizeof(*id)); |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1554 | /* XXX "steals" key/comment from idlist */ |
| 1555 | id->key = idlist->keys[j]; |
| 1556 | id->filename = idlist->comments[j]; |
| 1557 | idlist->keys[j] = NULL; |
| 1558 | idlist->comments[j] = NULL; |
| 1559 | id->agent_fd = agent_fd; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1560 | TAILQ_INSERT_TAIL(&agent, id, next); |
| 1561 | } |
| 1562 | } |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1563 | ssh_free_identitylist(idlist); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1564 | /* append remaining agent keys */ |
| 1565 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { |
| 1566 | TAILQ_REMOVE(&agent, id, next); |
| 1567 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1568 | } |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1569 | authctxt->agent_fd = agent_fd; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1570 | } |
djm@openbsd.org | 82f24c3 | 2016-05-23 23:30:50 +0000 | [diff] [blame] | 1571 | /* Prefer PKCS11 keys that are explicitly listed */ |
| 1572 | TAILQ_FOREACH_SAFE(id, &files, next, tmp) { |
| 1573 | if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0) |
| 1574 | continue; |
| 1575 | found = 0; |
| 1576 | TAILQ_FOREACH(id2, &files, next) { |
| 1577 | if (id2->key == NULL || |
| 1578 | (id2->key->flags & SSHKEY_FLAG_EXT) == 0) |
| 1579 | continue; |
| 1580 | if (sshkey_equal(id->key, id2->key)) { |
| 1581 | TAILQ_REMOVE(&files, id, next); |
| 1582 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1583 | found = 1; |
| 1584 | break; |
| 1585 | } |
| 1586 | } |
| 1587 | /* If IdentitiesOnly set and key not found then don't use it */ |
| 1588 | if (!found && options.identities_only) { |
| 1589 | TAILQ_REMOVE(&files, id, next); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1590 | freezero(id, sizeof(*id)); |
djm@openbsd.org | 82f24c3 | 2016-05-23 23:30:50 +0000 | [diff] [blame] | 1591 | } |
| 1592 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1593 | /* append remaining keys from the config file */ |
| 1594 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { |
| 1595 | TAILQ_REMOVE(&files, id, next); |
| 1596 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1597 | } |
djm@openbsd.org | e679c09 | 2015-10-13 16:15:21 +0000 | [diff] [blame] | 1598 | /* finally, filter by PubkeyAcceptedKeyTypes */ |
| 1599 | TAILQ_FOREACH_SAFE(id, preferred, next, id2) { |
djm@openbsd.org | d78b75d | 2018-07-03 13:07:58 +0000 | [diff] [blame] | 1600 | if (id->key != NULL && !key_type_allowed_by_config(id->key)) { |
djm@openbsd.org | e679c09 | 2015-10-13 16:15:21 +0000 | [diff] [blame] | 1601 | debug("Skipping %s key %s - " |
| 1602 | "not in PubkeyAcceptedKeyTypes", |
| 1603 | sshkey_ssh_name(id->key), id->filename); |
| 1604 | TAILQ_REMOVE(preferred, id, next); |
| 1605 | sshkey_free(id->key); |
| 1606 | free(id->filename); |
| 1607 | memset(id, 0, sizeof(*id)); |
| 1608 | continue; |
| 1609 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1610 | } |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 1611 | /* List the keys we plan on using */ |
| 1612 | TAILQ_FOREACH_SAFE(id, preferred, next, id2) { |
| 1613 | ident = format_identity(id); |
| 1614 | debug("Will attempt key: %s", ident); |
| 1615 | free(ident); |
| 1616 | } |
| 1617 | debug2("%s: done", __func__); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1618 | } |
| 1619 | |
| 1620 | static void |
| 1621 | pubkey_cleanup(Authctxt *authctxt) |
| 1622 | { |
| 1623 | Identity *id; |
| 1624 | |
djm@openbsd.org | aaed635 | 2018-11-16 02:46:20 +0000 | [diff] [blame] | 1625 | if (authctxt->agent_fd != -1) { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1626 | ssh_close_authentication_socket(authctxt->agent_fd); |
djm@openbsd.org | aaed635 | 2018-11-16 02:46:20 +0000 | [diff] [blame] | 1627 | authctxt->agent_fd = -1; |
| 1628 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1629 | for (id = TAILQ_FIRST(&authctxt->keys); id; |
| 1630 | id = TAILQ_FIRST(&authctxt->keys)) { |
| 1631 | TAILQ_REMOVE(&authctxt->keys, id, next); |
mmcc@openbsd.org | 89540b6 | 2015-12-11 02:31:47 +0000 | [diff] [blame] | 1632 | sshkey_free(id->key); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1633 | free(id->filename); |
| 1634 | free(id); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1635 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1636 | } |
| 1637 | |
djm@openbsd.org | b9844a4 | 2016-12-04 23:54:02 +0000 | [diff] [blame] | 1638 | static void |
| 1639 | pubkey_reset(Authctxt *authctxt) |
| 1640 | { |
| 1641 | Identity *id; |
| 1642 | |
| 1643 | TAILQ_FOREACH(id, &authctxt->keys, next) |
| 1644 | id->tried = 0; |
| 1645 | } |
| 1646 | |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1647 | static int |
| 1648 | try_identity(Identity *id) |
| 1649 | { |
| 1650 | if (!id->key) |
| 1651 | return (0); |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1652 | if (sshkey_type_plain(id->key->type) == KEY_RSA && |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1653 | (datafellows & SSH_BUG_RSASIGMD5) != 0) { |
| 1654 | debug("Skipped %s key %s for RSA/MD5 server", |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 1655 | sshkey_type(id->key), id->filename); |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1656 | return (0); |
| 1657 | } |
djm@openbsd.org | 873d3e7 | 2017-04-30 23:18:44 +0000 | [diff] [blame] | 1658 | return 1; |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1659 | } |
| 1660 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1661 | int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1662 | userauth_pubkey(struct ssh *ssh) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1663 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1664 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1665 | Identity *id; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1666 | int sent = 0; |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 1667 | char *ident; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1668 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1669 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
| 1670 | if (id->tried++) |
| 1671 | return (0); |
Darren Tucker | d05b601 | 2003-10-15 15:55:59 +1000 | [diff] [blame] | 1672 | /* move key to the end of the queue */ |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1673 | TAILQ_REMOVE(&authctxt->keys, id, next); |
| 1674 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); |
| 1675 | /* |
| 1676 | * send a test message if we have the public key. for |
| 1677 | * encrypted keys we cannot do this and have to load the |
| 1678 | * private key instead |
| 1679 | */ |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 1680 | if (id->key != NULL) { |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1681 | if (try_identity(id)) { |
djm@openbsd.org | beb9e52 | 2018-09-14 05:26:27 +0000 | [diff] [blame] | 1682 | ident = format_identity(id); |
| 1683 | debug("Offering public key: %s", ident); |
| 1684 | free(ident); |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1685 | sent = send_pubkey_test(ssh, id); |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 1686 | } |
| 1687 | } else { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1688 | debug("Trying private key: %s", id->filename); |
jcs@openbsd.org | f361df4 | 2015-11-15 22:26:49 +0000 | [diff] [blame] | 1689 | id->key = load_identity_file(id); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1690 | if (id->key != NULL) { |
markus@openbsd.org | 3a1638d | 2015-07-10 06:21:53 +0000 | [diff] [blame] | 1691 | if (try_identity(id)) { |
| 1692 | id->isprivate = 1; |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1693 | sent = sign_and_send_pubkey(ssh, id); |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 1694 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1695 | sshkey_free(id->key); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1696 | id->key = NULL; |
djm@openbsd.org | b9844a4 | 2016-12-04 23:54:02 +0000 | [diff] [blame] | 1697 | id->isprivate = 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1698 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1699 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1700 | if (sent) |
| 1701 | return (sent); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1702 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1703 | return (0); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1704 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1705 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1706 | /* |
| 1707 | * Send userauth request message specifying keyboard-interactive method. |
| 1708 | */ |
| 1709 | int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1710 | userauth_kbdint(struct ssh *ssh) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1711 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1712 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1713 | int r; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1714 | |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 1715 | if (authctxt->attempt_kbdint++ >= options.number_of_password_prompts) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1716 | return 0; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1717 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
djm@openbsd.org | 4a52694 | 2019-01-04 03:27:50 +0000 | [diff] [blame] | 1718 | if (authctxt->attempt_kbdint > 1 && !authctxt->info_req_seen) { |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1719 | debug3("userauth_kbdint: disable: no info_req_seen"); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1720 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1721 | return 0; |
| 1722 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1723 | |
| 1724 | debug2("userauth_kbdint"); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1725 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 1726 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1727 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1728 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1729 | (r = sshpkt_put_cstring(ssh, "")) != 0 || /* lang */ |
| 1730 | (r = sshpkt_put_cstring(ssh, options.kbd_interactive_devices ? |
| 1731 | options.kbd_interactive_devices : "")) != 0 || |
| 1732 | (r = sshpkt_send(ssh)) != 0) |
| 1733 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1734 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1735 | 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] | 1736 | return 1; |
| 1737 | } |
| 1738 | |
| 1739 | /* |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1740 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1741 | */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 1742 | int |
markus@openbsd.org | 2ae666a | 2017-05-30 14:23:52 +0000 | [diff] [blame] | 1743 | 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] | 1744 | { |
markus@openbsd.org | 94583be | 2017-05-30 14:19:15 +0000 | [diff] [blame] | 1745 | Authctxt *authctxt = ssh->authctxt; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1746 | char *name = NULL, *inst = NULL, *lang = NULL, *prompt = NULL; |
| 1747 | char *response = NULL; |
| 1748 | u_char echo = 0; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1749 | u_int num_prompts, i; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1750 | int r; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1751 | |
| 1752 | debug2("input_userauth_info_req"); |
| 1753 | |
| 1754 | if (authctxt == NULL) |
| 1755 | fatal("input_userauth_info_req: no authentication context"); |
| 1756 | |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1757 | authctxt->info_req_seen = 1; |
| 1758 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1759 | if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 || |
| 1760 | (r = sshpkt_get_cstring(ssh, &inst, NULL)) != 0 || |
| 1761 | (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0) |
| 1762 | goto out; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1763 | if (strlen(name) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1764 | logit("%s", name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1765 | if (strlen(inst) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1766 | logit("%s", inst); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1767 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1768 | if ((r = sshpkt_get_u32(ssh, &num_prompts)) != 0) |
| 1769 | goto out; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1770 | /* |
| 1771 | * Begin to build info response packet based on prompts requested. |
| 1772 | * We commit to providing the correct number of responses, so if |
| 1773 | * further on we run into a problem that prevents this, we have to |
| 1774 | * be sure and clean this up and send a correct error response. |
| 1775 | */ |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1776 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_INFO_RESPONSE)) != 0 || |
| 1777 | (r = sshpkt_put_u32(ssh, num_prompts)) != 0) |
| 1778 | goto out; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1779 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 1780 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1781 | for (i = 0; i < num_prompts; i++) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1782 | if ((r = sshpkt_get_cstring(ssh, &prompt, NULL)) != 0 || |
| 1783 | (r = sshpkt_get_u8(ssh, &echo)) != 0) |
| 1784 | goto out; |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 1785 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1786 | if ((r = sshpkt_put_cstring(ssh, response)) != 0) |
| 1787 | goto out; |
| 1788 | freezero(response, strlen(response)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1789 | free(prompt); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1790 | response = prompt = NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1791 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 1792 | /* done with parsing incoming message. */ |
| 1793 | if ((r = sshpkt_get_end(ssh)) != 0 || |
| 1794 | (r = sshpkt_add_padding(ssh, 64)) != 0) |
| 1795 | goto out; |
| 1796 | r = sshpkt_send(ssh); |
| 1797 | out: |
| 1798 | if (response) |
| 1799 | freezero(response, strlen(response)); |
| 1800 | free(prompt); |
| 1801 | free(name); |
| 1802 | free(inst); |
| 1803 | free(lang); |
| 1804 | return r; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1805 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1806 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1807 | static int |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 1808 | 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] | 1809 | const u_char *data, size_t datalen) |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1810 | { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1811 | struct sshbuf *b; |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1812 | struct stat st; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1813 | pid_t pid; |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1814 | int i, r, to[2], from[2], status; |
| 1815 | int sock = ssh_packet_get_connection_in(ssh); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1816 | u_char rversion = 0, version = 2; |
| 1817 | void (*osigchld)(int); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1818 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1819 | *sigp = NULL; |
| 1820 | *lenp = 0; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1821 | |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1822 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1823 | error("%s: not installed: %s", __func__, strerror(errno)); |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1824 | return -1; |
| 1825 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1826 | if (fflush(stdout) != 0) { |
| 1827 | error("%s: fflush: %s", __func__, strerror(errno)); |
| 1828 | return -1; |
| 1829 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1830 | if (pipe(to) < 0) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1831 | error("%s: pipe: %s", __func__, strerror(errno)); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1832 | return -1; |
| 1833 | } |
| 1834 | if (pipe(from) < 0) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1835 | error("%s: pipe: %s", __func__, strerror(errno)); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1836 | return -1; |
| 1837 | } |
| 1838 | if ((pid = fork()) < 0) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1839 | error("%s: fork: %s", __func__, strerror(errno)); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1840 | return -1; |
| 1841 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1842 | osigchld = signal(SIGCHLD, SIG_DFL); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1843 | if (pid == 0) { |
Darren Tucker | 6e7fe1c | 2010-01-08 17:07:22 +1100 | [diff] [blame] | 1844 | /* keep the socket on exec */ |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1845 | fcntl(sock, F_SETFD, 0); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1846 | close(from[0]); |
| 1847 | if (dup2(from[1], STDOUT_FILENO) < 0) |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1848 | fatal("%s: dup2: %s", __func__, strerror(errno)); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1849 | close(to[1]); |
| 1850 | if (dup2(to[0], STDIN_FILENO) < 0) |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1851 | fatal("%s: dup2: %s", __func__, strerror(errno)); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1852 | close(from[1]); |
| 1853 | close(to[0]); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1854 | /* Close everything but stdio and the socket */ |
| 1855 | for (i = STDERR_FILENO + 1; i < sock; i++) |
| 1856 | close(i); |
| 1857 | closefrom(sock + 1); |
| 1858 | debug3("%s: [child] pid=%ld, exec %s", |
| 1859 | __func__, (long)getpid(), _PATH_SSH_KEY_SIGN); |
mmcc@openbsd.org | 94141b7 | 2015-12-11 00:20:04 +0000 | [diff] [blame] | 1860 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *)NULL); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1861 | fatal("%s: exec(%s): %s", __func__, _PATH_SSH_KEY_SIGN, |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1862 | strerror(errno)); |
| 1863 | } |
| 1864 | close(from[1]); |
| 1865 | close(to[0]); |
| 1866 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1867 | if ((b = sshbuf_new()) == NULL) |
| 1868 | fatal("%s: sshbuf_new failed", __func__); |
| 1869 | /* send # of sock, data to be signed */ |
djm@openbsd.org | 326e2fa | 2017-01-30 00:32:28 +0000 | [diff] [blame] | 1870 | if ((r = sshbuf_put_u32(b, sock)) != 0 || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1871 | (r = sshbuf_put_string(b, data, datalen)) != 0) |
| 1872 | fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 1873 | if (ssh_msg_send(to[1], version, b) == -1) |
| 1874 | fatal("%s: couldn't send request", __func__); |
| 1875 | sshbuf_reset(b); |
| 1876 | r = ssh_msg_recv(from[0], b); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1877 | close(from[0]); |
| 1878 | close(to[1]); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1879 | if (r < 0) { |
| 1880 | error("%s: no reply", __func__); |
| 1881 | goto fail; |
| 1882 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1883 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1884 | errno = 0; |
| 1885 | while (waitpid(pid, &status, 0) < 0) { |
| 1886 | if (errno != EINTR) { |
| 1887 | error("%s: waitpid %ld: %s", |
| 1888 | __func__, (long)pid, strerror(errno)); |
| 1889 | goto fail; |
| 1890 | } |
| 1891 | } |
| 1892 | if (!WIFEXITED(status)) { |
| 1893 | error("%s: exited abnormally", __func__); |
| 1894 | goto fail; |
| 1895 | } |
| 1896 | if (WEXITSTATUS(status) != 0) { |
| 1897 | error("%s: exited with status %d", |
| 1898 | __func__, WEXITSTATUS(status)); |
| 1899 | goto fail; |
| 1900 | } |
| 1901 | if ((r = sshbuf_get_u8(b, &rversion)) != 0) { |
| 1902 | error("%s: buffer error: %s", __func__, ssh_err(r)); |
| 1903 | goto fail; |
| 1904 | } |
| 1905 | if (rversion != version) { |
| 1906 | error("%s: bad version", __func__); |
| 1907 | goto fail; |
| 1908 | } |
| 1909 | if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) { |
| 1910 | error("%s: buffer error: %s", __func__, ssh_err(r)); |
| 1911 | fail: |
| 1912 | signal(SIGCHLD, osigchld); |
| 1913 | sshbuf_free(b); |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1914 | return -1; |
| 1915 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1916 | signal(SIGCHLD, osigchld); |
| 1917 | sshbuf_free(b); |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1918 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1919 | return 0; |
| 1920 | } |
| 1921 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1922 | int |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1923 | userauth_hostbased(struct ssh *ssh) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1924 | { |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1925 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1926 | struct sshkey *private = NULL; |
| 1927 | struct sshbuf *b = NULL; |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1928 | u_char *sig = NULL, *keyblob = NULL; |
| 1929 | char *fp = NULL, *chost = NULL, *lname = NULL; |
| 1930 | size_t siglen = 0, keylen = 0; |
| 1931 | int i, r, success = 0; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1932 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1933 | if (authctxt->ktypes == NULL) { |
| 1934 | authctxt->oktypes = xstrdup(options.hostbased_key_types); |
| 1935 | authctxt->ktypes = authctxt->oktypes; |
| 1936 | } |
djm@openbsd.org | 1195f4c | 2015-01-08 10:14:08 +0000 | [diff] [blame] | 1937 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1938 | /* |
| 1939 | * Work through each listed type pattern in HostbasedKeyTypes, |
| 1940 | * trying each hostkey that matches the type in turn. |
| 1941 | */ |
| 1942 | for (;;) { |
| 1943 | if (authctxt->active_ktype == NULL) |
| 1944 | authctxt->active_ktype = strsep(&authctxt->ktypes, ","); |
| 1945 | if (authctxt->active_ktype == NULL || |
| 1946 | *authctxt->active_ktype == '\0') |
| 1947 | break; |
| 1948 | debug3("%s: trying key type %s", __func__, |
| 1949 | authctxt->active_ktype); |
| 1950 | |
| 1951 | /* check for a useful key */ |
| 1952 | private = NULL; |
| 1953 | for (i = 0; i < authctxt->sensitive->nkeys; i++) { |
| 1954 | if (authctxt->sensitive->keys[i] == NULL || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1955 | authctxt->sensitive->keys[i]->type == KEY_UNSPEC) |
| 1956 | continue; |
| 1957 | if (match_pattern_list( |
| 1958 | sshkey_ssh_name(authctxt->sensitive->keys[i]), |
djm@openbsd.org | e661a86 | 2015-05-04 06:10:48 +0000 | [diff] [blame] | 1959 | authctxt->active_ktype, 0) != 1) |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1960 | continue; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1961 | /* we take and free the key */ |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1962 | private = authctxt->sensitive->keys[i]; |
| 1963 | authctxt->sensitive->keys[i] = NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1964 | break; |
| 1965 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1966 | /* Found one */ |
| 1967 | if (private != NULL) |
| 1968 | break; |
| 1969 | /* No more keys of this type; advance */ |
| 1970 | authctxt->active_ktype = NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1971 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1972 | if (private == NULL) { |
| 1973 | free(authctxt->oktypes); |
| 1974 | authctxt->oktypes = authctxt->ktypes = NULL; |
| 1975 | authctxt->active_ktype = NULL; |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1976 | debug("No more client hostkeys for hostbased authentication."); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1977 | goto out; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1978 | } |
djm@openbsd.org | 17bf3d8 | 2014-12-11 05:13:28 +0000 | [diff] [blame] | 1979 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1980 | if ((fp = sshkey_fingerprint(private, options.fingerprint_hash, |
| 1981 | SSH_FP_DEFAULT)) == NULL) { |
| 1982 | error("%s: sshkey_fingerprint failed", __func__); |
| 1983 | goto out; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1984 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1985 | debug("%s: trying hostkey %s %s", |
| 1986 | __func__, sshkey_ssh_name(private), fp); |
djm@openbsd.org | 17bf3d8 | 2014-12-11 05:13:28 +0000 | [diff] [blame] | 1987 | |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1988 | /* figure out a name for the client host */ |
djm@openbsd.org | 64c9598 | 2019-01-19 21:40:21 +0000 | [diff] [blame] | 1989 | lname = get_local_name(ssh_packet_get_connection_in(ssh)); |
| 1990 | if (lname == NULL) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1991 | error("%s: cannot get local ipaddr/name", __func__); |
| 1992 | goto out; |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1993 | } |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1994 | |
| 1995 | /* XXX sshbuf_put_stringf? */ |
| 1996 | xasprintf(&chost, "%s.", lname); |
| 1997 | debug2("%s: chost %s", __func__, chost); |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1998 | |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 1999 | /* construct data */ |
| 2000 | if ((b = sshbuf_new()) == NULL) { |
| 2001 | error("%s: sshbuf_new failed", __func__); |
| 2002 | goto out; |
| 2003 | } |
| 2004 | if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) { |
| 2005 | error("%s: sshkey_to_blob: %s", __func__, ssh_err(r)); |
| 2006 | goto out; |
| 2007 | } |
| 2008 | if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 || |
| 2009 | (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 2010 | (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 || |
djm@openbsd.org | 14b5c63 | 2018-01-23 05:27:21 +0000 | [diff] [blame] | 2011 | (r = sshbuf_put_cstring(b, authctxt->service)) != 0 || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2012 | (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 || |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 2013 | (r = sshbuf_put_cstring(b, sshkey_ssh_name(private))) != 0 || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2014 | (r = sshbuf_put_string(b, keyblob, keylen)) != 0 || |
| 2015 | (r = sshbuf_put_cstring(b, chost)) != 0 || |
| 2016 | (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) { |
| 2017 | error("%s: buffer error: %s", __func__, ssh_err(r)); |
| 2018 | goto out; |
| 2019 | } |
| 2020 | |
| 2021 | #ifdef DEBUG_PK |
| 2022 | sshbuf_dump(b, stderr); |
| 2023 | #endif |
djm@openbsd.org | ed1df72 | 2019-01-19 21:34:45 +0000 | [diff] [blame] | 2024 | if ((r = ssh_keysign(ssh, private, &sig, &siglen, |
| 2025 | sshbuf_ptr(b), sshbuf_len(b))) != 0) { |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2026 | error("sign using hostkey %s %s failed", |
| 2027 | sshkey_ssh_name(private), fp); |
| 2028 | goto out; |
| 2029 | } |
| 2030 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 || |
| 2031 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 2032 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 2033 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
markus@openbsd.org | 5467fbc | 2018-07-11 18:53:29 +0000 | [diff] [blame] | 2034 | (r = sshpkt_put_cstring(ssh, sshkey_ssh_name(private))) != 0 || |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2035 | (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 || |
| 2036 | (r = sshpkt_put_cstring(ssh, chost)) != 0 || |
| 2037 | (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 || |
| 2038 | (r = sshpkt_put_string(ssh, sig, siglen)) != 0 || |
| 2039 | (r = sshpkt_send(ssh)) != 0) { |
| 2040 | error("%s: packet error: %s", __func__, ssh_err(r)); |
| 2041 | goto out; |
| 2042 | } |
| 2043 | success = 1; |
| 2044 | |
| 2045 | out: |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2046 | if (sig != NULL) |
| 2047 | freezero(sig, siglen); |
djm@openbsd.org | 46347ed | 2015-01-30 11:43:14 +0000 | [diff] [blame] | 2048 | free(keyblob); |
| 2049 | free(lname); |
| 2050 | free(fp); |
| 2051 | free(chost); |
| 2052 | sshkey_free(private); |
| 2053 | sshbuf_free(b); |
| 2054 | |
| 2055 | return success; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 2056 | } |
| 2057 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2058 | /* find auth method */ |
| 2059 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2060 | /* |
| 2061 | * given auth method name, if configurable options permit this method fill |
| 2062 | * in auth_ident field and return true, otherwise return false. |
| 2063 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2064 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2065 | authmethod_is_enabled(Authmethod *method) |
| 2066 | { |
| 2067 | if (method == NULL) |
| 2068 | return 0; |
| 2069 | /* return false if options indicate this method is disabled */ |
| 2070 | if (method->enabled == NULL || *method->enabled == 0) |
| 2071 | return 0; |
| 2072 | /* return false if batch mode is enabled but method needs interactive mode */ |
| 2073 | if (method->batch_flag != NULL && *method->batch_flag != 0) |
| 2074 | return 0; |
| 2075 | return 1; |
| 2076 | } |
| 2077 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2078 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2079 | authmethod_lookup(const char *name) |
| 2080 | { |
| 2081 | Authmethod *method = NULL; |
| 2082 | if (name != NULL) |
| 2083 | for (method = authmethods; method->name != NULL; method++) |
| 2084 | if (strcmp(name, method->name) == 0) |
| 2085 | return method; |
| 2086 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); |
| 2087 | return NULL; |
| 2088 | } |
| 2089 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2090 | /* XXX internal state */ |
| 2091 | static Authmethod *current = NULL; |
| 2092 | static char *supported = NULL; |
| 2093 | static char *preferred = NULL; |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 2094 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2095 | /* |
| 2096 | * Given the authentication method list sent by the server, return the |
| 2097 | * 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] | 2098 | * use a built-in default list. |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2099 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2100 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2101 | authmethod_get(char *authlist) |
| 2102 | { |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2103 | char *name = NULL; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 2104 | u_int next; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2105 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2106 | /* Use a suitable default if we're passed a nil list. */ |
| 2107 | if (authlist == NULL || strlen(authlist) == 0) |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2108 | authlist = options.preferred_authentications; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2109 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2110 | if (supported == NULL || strcmp(authlist, supported) != 0) { |
| 2111 | debug3("start over, passed a different list %s", authlist); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2112 | free(supported); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2113 | supported = xstrdup(authlist); |
| 2114 | preferred = options.preferred_authentications; |
| 2115 | debug3("preferred %s", preferred); |
| 2116 | current = NULL; |
| 2117 | } else if (current != NULL && authmethod_is_enabled(current)) |
| 2118 | return current; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 2119 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2120 | for (;;) { |
| 2121 | if ((name = match_list(preferred, supported, &next)) == NULL) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 2122 | debug("No more authentication methods to try."); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2123 | current = NULL; |
| 2124 | return NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 2125 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2126 | preferred += next; |
| 2127 | debug3("authmethod_lookup %s", name); |
| 2128 | debug3("remaining preferred: %s", preferred); |
| 2129 | if ((current = authmethod_lookup(name)) != NULL && |
| 2130 | authmethod_is_enabled(current)) { |
| 2131 | debug3("authmethod_is_enabled %s", name); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 2132 | debug("Next authentication method: %s", name); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2133 | free(name); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2134 | return current; |
| 2135 | } |
Darren Tucker | e52a260 | 2013-06-06 08:22:05 +1000 | [diff] [blame] | 2136 | free(name); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 2137 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2138 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2139 | |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 2140 | static char * |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2141 | authmethods_get(void) |
| 2142 | { |
| 2143 | Authmethod *method = NULL; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2144 | struct sshbuf *b; |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 2145 | char *list; |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2146 | int r; |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2147 | |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2148 | if ((b = sshbuf_new()) == NULL) |
| 2149 | fatal("%s: sshbuf_new failed", __func__); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2150 | for (method = authmethods; method->name != NULL; method++) { |
| 2151 | if (authmethod_is_enabled(method)) { |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2152 | if ((r = sshbuf_putf(b, "%s%s", |
| 2153 | sshbuf_len(b) ? "," : "", method->name)) != 0) |
| 2154 | fatal("%s: buffer error: %s", |
| 2155 | __func__, ssh_err(r)); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 2156 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2157 | } |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2158 | if ((list = sshbuf_dup_string(b)) == NULL) |
djm@openbsd.org | 1a31d02 | 2016-05-02 08:49:03 +0000 | [diff] [blame] | 2159 | fatal("%s: sshbuf_dup_string failed", __func__); |
markus@openbsd.org | cecee2d | 2018-07-09 21:03:30 +0000 | [diff] [blame] | 2160 | sshbuf_free(b); |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 2161 | return list; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 2162 | } |