Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 23 | */ |
| 24 | |
| 25 | #include "includes.h" |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.111 2003/02/16 17:09:57 markus Exp $"); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 27 | |
| 28 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 29 | #include "ssh2.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 30 | #include "xmalloc.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 31 | #include "buffer.h" |
| 32 | #include "packet.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 33 | #include "compat.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 34 | #include "bufaux.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 35 | #include "cipher.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 36 | #include "kex.h" |
| 37 | #include "myproposal.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 38 | #include "sshconnect.h" |
| 39 | #include "authfile.h" |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 40 | #include "dh.h" |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 41 | #include "authfd.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 42 | #include "log.h" |
| 43 | #include "readconf.h" |
| 44 | #include "readpass.h" |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 45 | #include "match.h" |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 46 | #include "dispatch.h" |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 47 | #include "canohost.h" |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 48 | #include "msg.h" |
| 49 | #include "pathnames.h" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 50 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 51 | /* import */ |
| 52 | extern char *client_version_string; |
| 53 | extern char *server_version_string; |
| 54 | extern Options options; |
| 55 | |
| 56 | /* |
| 57 | * SSH2 key exchange |
| 58 | */ |
| 59 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 60 | u_char *session_id2 = NULL; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 61 | int session_id2_len = 0; |
| 62 | |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 63 | char *xxx_host; |
| 64 | struct sockaddr *xxx_hostaddr; |
| 65 | |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 66 | Kex *xxx_kex = NULL; |
| 67 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 68 | static int |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 69 | verify_host_key_callback(Key *hostkey) |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 70 | { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 71 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
Damien Miller | 59d9fb9 | 2001-10-10 15:03:11 +1000 | [diff] [blame] | 72 | fatal("Host key verification failed."); |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 73 | return 0; |
| 74 | } |
| 75 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 76 | void |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 77 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
| 78 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 79 | Kex *kex; |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 80 | |
| 81 | xxx_host = host; |
| 82 | xxx_hostaddr = hostaddr; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 83 | |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 84 | if (options.ciphers == (char *)-1) { |
| 85 | log("No valid ciphers for protocol version 2 given, using defaults."); |
| 86 | options.ciphers = NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 87 | } |
| 88 | if (options.ciphers != NULL) { |
| 89 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
| 90 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; |
| 91 | } |
Damien Miller | a0ff466 | 2001-03-30 10:49:35 +1000 | [diff] [blame] | 92 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
| 93 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); |
| 94 | myproposal[PROPOSAL_ENC_ALGS_STOC] = |
| 95 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 96 | if (options.compression) { |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 97 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
Ben Lindstrom | 343010a | 2002-07-04 00:16:25 +0000 | [diff] [blame] | 98 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib,none"; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 99 | } else { |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 100 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
Ben Lindstrom | 343010a | 2002-07-04 00:16:25 +0000 | [diff] [blame] | 101 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib"; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 102 | } |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 103 | if (options.macs != NULL) { |
| 104 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = |
| 105 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; |
| 106 | } |
Ben Lindstrom | 982dbbc | 2001-04-17 18:11:36 +0000 | [diff] [blame] | 107 | if (options.hostkeyalgorithms != NULL) |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 108 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
Ben Lindstrom | 982dbbc | 2001-04-17 18:11:36 +0000 | [diff] [blame] | 109 | options.hostkeyalgorithms; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 110 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 111 | /* start key exchange */ |
Ben Lindstrom | 238abf6 | 2001-04-04 17:52:53 +0000 | [diff] [blame] | 112 | kex = kex_setup(myproposal); |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 113 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
| 114 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 115 | kex->client_version_string=client_version_string; |
| 116 | kex->server_version_string=server_version_string; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 117 | kex->verify_host_key=&verify_host_key_callback; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 118 | |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 119 | xxx_kex = kex; |
| 120 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 121 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 122 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 123 | session_id2 = kex->session_id; |
| 124 | session_id2_len = kex->session_id_len; |
| 125 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 126 | #ifdef DEBUG_KEXDH |
| 127 | /* send 1st encrypted/maced/compressed message */ |
| 128 | packet_start(SSH2_MSG_IGNORE); |
| 129 | packet_put_cstring("markus"); |
| 130 | packet_send(); |
| 131 | packet_write_wait(); |
| 132 | #endif |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 133 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 134 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 135 | /* |
| 136 | * Authenticate user |
| 137 | */ |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 138 | |
| 139 | typedef struct Authctxt Authctxt; |
| 140 | typedef struct Authmethod Authmethod; |
| 141 | |
| 142 | typedef int sign_cb_fn( |
| 143 | Authctxt *authctxt, Key *key, |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 144 | u_char **sigp, u_int *lenp, u_char *data, u_int datalen); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 145 | |
| 146 | struct Authctxt { |
| 147 | const char *server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 148 | const char *local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 149 | const char *host; |
| 150 | const char *service; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 151 | Authmethod *method; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 152 | int success; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 153 | char *authlist; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 154 | /* pubkey */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 155 | Key *last_key; |
| 156 | sign_cb_fn *last_key_sign; |
| 157 | int last_key_hint; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 158 | AuthenticationConnection *agent; |
| 159 | /* hostbased */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 160 | Sensitive *sensitive; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 161 | /* kbd-interactive */ |
| 162 | int info_req_seen; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 163 | }; |
| 164 | struct Authmethod { |
| 165 | char *name; /* string to compare against server's list */ |
| 166 | int (*userauth)(Authctxt *authctxt); |
| 167 | int *enabled; /* flag in option struct that enables method */ |
| 168 | int *batch_flag; /* flag in option struct that disables method */ |
| 169 | }; |
| 170 | |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 171 | void input_userauth_success(int, u_int32_t, void *); |
| 172 | void input_userauth_failure(int, u_int32_t, void *); |
| 173 | void input_userauth_banner(int, u_int32_t, void *); |
| 174 | void input_userauth_error(int, u_int32_t, void *); |
| 175 | void input_userauth_info_req(int, u_int32_t, void *); |
| 176 | void input_userauth_pk_ok(int, u_int32_t, void *); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 177 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 178 | |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 179 | int userauth_none(Authctxt *); |
| 180 | int userauth_pubkey(Authctxt *); |
| 181 | int userauth_passwd(Authctxt *); |
| 182 | int userauth_kbdint(Authctxt *); |
| 183 | int userauth_hostbased(Authctxt *); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 184 | |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 185 | void userauth(Authctxt *, char *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 186 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 187 | static int sign_and_send_pubkey(Authctxt *, Key *, sign_cb_fn *); |
| 188 | static void clear_auth_state(Authctxt *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 189 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 190 | static Authmethod *authmethod_get(char *authlist); |
| 191 | static Authmethod *authmethod_lookup(const char *name); |
| 192 | static char *authmethods_get(void); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 193 | |
| 194 | Authmethod authmethods[] = { |
Ben Lindstrom | 1bfe291 | 2001-06-05 19:37:25 +0000 | [diff] [blame] | 195 | {"hostbased", |
| 196 | userauth_hostbased, |
| 197 | &options.hostbased_authentication, |
| 198 | NULL}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 199 | {"publickey", |
| 200 | userauth_pubkey, |
| 201 | &options.pubkey_authentication, |
| 202 | NULL}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 203 | {"keyboard-interactive", |
| 204 | userauth_kbdint, |
| 205 | &options.kbd_interactive_authentication, |
| 206 | &options.batch_mode}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 207 | {"password", |
| 208 | userauth_passwd, |
| 209 | &options.password_authentication, |
| 210 | &options.batch_mode}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 211 | {"none", |
| 212 | userauth_none, |
| 213 | NULL, |
| 214 | NULL}, |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 215 | {NULL, NULL, NULL, NULL} |
| 216 | }; |
| 217 | |
| 218 | void |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 219 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 220 | Sensitive *sensitive) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 221 | { |
| 222 | Authctxt authctxt; |
| 223 | int type; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 224 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 225 | if (options.challenge_response_authentication) |
Ben Lindstrom | 95fb2dd | 2001-01-23 03:12:10 +0000 | [diff] [blame] | 226 | options.kbd_interactive_authentication = 1; |
| 227 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 228 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
| 229 | packet_put_cstring("ssh-userauth"); |
| 230 | packet_send(); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 231 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 232 | packet_write_wait(); |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 233 | type = packet_read(); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 234 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
| 235 | fatal("Server denied authentication request: %d", type); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 236 | if (packet_remaining() > 0) { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 237 | char *reply = packet_get_string(NULL); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 238 | debug2("service_accept: %s", reply); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 239 | xfree(reply); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 240 | } else { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 241 | debug2("buggy server: service_accept w/o service"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 242 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 243 | packet_check_eom(); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 244 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 245 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 246 | if (options.preferred_authentications == NULL) |
| 247 | options.preferred_authentications = authmethods_get(); |
| 248 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 249 | /* setup authentication context */ |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 250 | memset(&authctxt, 0, sizeof(authctxt)); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 251 | authctxt.agent = ssh_get_authentication_connection(); |
| 252 | authctxt.server_user = server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 253 | authctxt.local_user = local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 254 | authctxt.host = host; |
| 255 | authctxt.service = "ssh-connection"; /* service name */ |
| 256 | authctxt.success = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 257 | authctxt.method = authmethod_lookup("none"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 258 | authctxt.authlist = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 259 | authctxt.sensitive = sensitive; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 260 | authctxt.info_req_seen = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 261 | if (authctxt.method == NULL) |
| 262 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 263 | |
| 264 | /* initial userauth request */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 265 | userauth_none(&authctxt); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 266 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 267 | dispatch_init(&input_userauth_error); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 268 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
| 269 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 270 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 271 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
| 272 | |
| 273 | if (authctxt.agent != NULL) |
| 274 | ssh_close_authentication_connection(authctxt.agent); |
| 275 | |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 276 | debug("Authentication succeeded (%s).", authctxt.method->name); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 277 | } |
| 278 | void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 279 | userauth(Authctxt *authctxt, char *authlist) |
| 280 | { |
| 281 | if (authlist == NULL) { |
| 282 | authlist = authctxt->authlist; |
| 283 | } else { |
| 284 | if (authctxt->authlist) |
| 285 | xfree(authctxt->authlist); |
| 286 | authctxt->authlist = authlist; |
| 287 | } |
| 288 | for (;;) { |
| 289 | Authmethod *method = authmethod_get(authlist); |
| 290 | if (method == NULL) |
| 291 | fatal("Permission denied (%s).", authlist); |
| 292 | authctxt->method = method; |
| 293 | if (method->userauth(authctxt) != 0) { |
| 294 | debug2("we sent a %s packet, wait for reply", method->name); |
| 295 | break; |
| 296 | } else { |
| 297 | debug2("we did not send a packet, disable method"); |
| 298 | method->enabled = NULL; |
| 299 | } |
| 300 | } |
| 301 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 302 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 303 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 304 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 305 | { |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 306 | fatal("input_userauth_error: bad message during authentication: " |
| 307 | "type %d", type); |
| 308 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 309 | |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 310 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 311 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 312 | { |
| 313 | char *msg, *lang; |
| 314 | debug3("input_userauth_banner"); |
| 315 | msg = packet_get_string(NULL); |
| 316 | lang = packet_get_string(NULL); |
| 317 | fprintf(stderr, "%s", msg); |
| 318 | xfree(msg); |
| 319 | xfree(lang); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 320 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 321 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 322 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 323 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 324 | { |
| 325 | Authctxt *authctxt = ctxt; |
| 326 | if (authctxt == NULL) |
| 327 | fatal("input_userauth_success: no authentication context"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 328 | if (authctxt->authlist) |
| 329 | xfree(authctxt->authlist); |
| 330 | clear_auth_state(authctxt); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 331 | authctxt->success = 1; /* break out */ |
| 332 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 333 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 334 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 335 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 336 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 337 | Authctxt *authctxt = ctxt; |
| 338 | char *authlist = NULL; |
| 339 | int partial; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 340 | |
| 341 | if (authctxt == NULL) |
| 342 | fatal("input_userauth_failure: no authentication context"); |
| 343 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 344 | authlist = packet_get_string(NULL); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 345 | partial = packet_get_char(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 346 | packet_check_eom(); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 347 | |
| 348 | if (partial != 0) |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 349 | log("Authenticated with partial success."); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 350 | debug("Authentications that can continue: %s", authlist); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 351 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 352 | clear_auth_state(authctxt); |
| 353 | userauth(authctxt, authlist); |
| 354 | } |
| 355 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 356 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 357 | { |
| 358 | Authctxt *authctxt = ctxt; |
| 359 | Key *key = NULL; |
| 360 | Buffer b; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 361 | int pktype, sent = 0; |
| 362 | u_int alen, blen; |
| 363 | char *pkalg, *fp; |
| 364 | u_char *pkblob; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 365 | |
| 366 | if (authctxt == NULL) |
| 367 | fatal("input_userauth_pk_ok: no authentication context"); |
| 368 | if (datafellows & SSH_BUG_PKOK) { |
| 369 | /* this is similar to SSH_BUG_PKAUTH */ |
| 370 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); |
| 371 | pkblob = packet_get_string(&blen); |
| 372 | buffer_init(&b); |
| 373 | buffer_append(&b, pkblob, blen); |
| 374 | pkalg = buffer_get_string(&b, &alen); |
| 375 | buffer_free(&b); |
| 376 | } else { |
| 377 | pkalg = packet_get_string(&alen); |
| 378 | pkblob = packet_get_string(&blen); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 379 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 380 | packet_check_eom(); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 381 | |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 382 | debug("Server accepts key: pkalg %s blen %u lastkey %p hint %d", |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 383 | pkalg, blen, authctxt->last_key, authctxt->last_key_hint); |
| 384 | |
| 385 | do { |
| 386 | if (authctxt->last_key == NULL || |
| 387 | authctxt->last_key_sign == NULL) { |
| 388 | debug("no last key or no sign cb"); |
| 389 | break; |
| 390 | } |
Damien Miller | 68f4598 | 2002-02-05 12:23:32 +1100 | [diff] [blame] | 391 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 392 | debug("unknown pkalg %s", pkalg); |
| 393 | break; |
| 394 | } |
| 395 | if ((key = key_from_blob(pkblob, blen)) == NULL) { |
| 396 | debug("no key from blob. pkalg %s", pkalg); |
| 397 | break; |
| 398 | } |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 399 | if (key->type != pktype) { |
Damien Miller | 68f4598 | 2002-02-05 12:23:32 +1100 | [diff] [blame] | 400 | error("input_userauth_pk_ok: type mismatch " |
| 401 | "for decoded key (received %d, expected %d)", |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 402 | key->type, pktype); |
Damien Miller | 68f4598 | 2002-02-05 12:23:32 +1100 | [diff] [blame] | 403 | break; |
| 404 | } |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 405 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); |
| 406 | debug2("input_userauth_pk_ok: fp %s", fp); |
| 407 | xfree(fp); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 408 | if (!key_equal(key, authctxt->last_key)) { |
| 409 | debug("key != last_key"); |
| 410 | break; |
| 411 | } |
| 412 | sent = sign_and_send_pubkey(authctxt, key, |
| 413 | authctxt->last_key_sign); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 414 | } while (0); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 415 | |
| 416 | if (key != NULL) |
| 417 | key_free(key); |
| 418 | xfree(pkalg); |
| 419 | xfree(pkblob); |
| 420 | |
| 421 | /* unregister */ |
| 422 | clear_auth_state(authctxt); |
| 423 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, NULL); |
| 424 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 425 | /* try another method if we did not send a packet */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 426 | if (sent == 0) |
| 427 | userauth(authctxt, NULL); |
| 428 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 429 | } |
| 430 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 431 | int |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 432 | userauth_none(Authctxt *authctxt) |
| 433 | { |
| 434 | /* initial userauth request */ |
| 435 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 436 | packet_put_cstring(authctxt->server_user); |
| 437 | packet_put_cstring(authctxt->service); |
| 438 | packet_put_cstring(authctxt->method->name); |
| 439 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 440 | return 1; |
| 441 | } |
| 442 | |
| 443 | int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 444 | userauth_passwd(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 445 | { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 446 | static int attempt = 0; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 447 | char prompt[150]; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 448 | char *password; |
| 449 | |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 450 | if (attempt++ >= options.number_of_password_prompts) |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 451 | return 0; |
| 452 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 453 | if (attempt != 1) |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 454 | error("Permission denied, please try again."); |
| 455 | |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 456 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 457 | authctxt->server_user, authctxt->host); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 458 | password = read_passphrase(prompt, 0); |
| 459 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 460 | packet_put_cstring(authctxt->server_user); |
| 461 | packet_put_cstring(authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 462 | packet_put_cstring(authctxt->method->name); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 463 | packet_put_char(0); |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 464 | packet_put_cstring(password); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 465 | memset(password, 0, strlen(password)); |
| 466 | xfree(password); |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 467 | packet_add_padding(64); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 468 | packet_send(); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 469 | |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 470 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 471 | &input_userauth_passwd_changereq); |
| 472 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 473 | return 1; |
| 474 | } |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 475 | /* |
| 476 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST |
| 477 | */ |
| 478 | void |
Tim Rice | c854962 | 2002-03-31 12:49:38 -0800 | [diff] [blame] | 479 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 480 | { |
| 481 | Authctxt *authctxt = ctxt; |
| 482 | char *info, *lang, *password = NULL, *retype = NULL; |
| 483 | char prompt[150]; |
| 484 | |
| 485 | debug2("input_userauth_passwd_changereq"); |
| 486 | |
| 487 | if (authctxt == NULL) |
| 488 | fatal("input_userauth_passwd_changereq: " |
| 489 | "no authentication context"); |
| 490 | |
| 491 | info = packet_get_string(NULL); |
| 492 | lang = packet_get_string(NULL); |
| 493 | if (strlen(info) > 0) |
| 494 | log("%s", info); |
| 495 | xfree(info); |
| 496 | xfree(lang); |
| 497 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 498 | packet_put_cstring(authctxt->server_user); |
| 499 | packet_put_cstring(authctxt->service); |
| 500 | packet_put_cstring(authctxt->method->name); |
| 501 | packet_put_char(1); /* additional info */ |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 502 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 503 | "Enter %.30s@%.128s's old password: ", |
| 504 | authctxt->server_user, authctxt->host); |
| 505 | password = read_passphrase(prompt, 0); |
| 506 | packet_put_cstring(password); |
| 507 | memset(password, 0, strlen(password)); |
| 508 | xfree(password); |
| 509 | password = NULL; |
| 510 | while (password == NULL) { |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 511 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 512 | "Enter %.30s@%.128s's new password: ", |
| 513 | authctxt->server_user, authctxt->host); |
| 514 | password = read_passphrase(prompt, RP_ALLOW_EOF); |
| 515 | if (password == NULL) { |
| 516 | /* bail out */ |
| 517 | return; |
| 518 | } |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 519 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 520 | "Retype %.30s@%.128s's new password: ", |
| 521 | authctxt->server_user, authctxt->host); |
| 522 | retype = read_passphrase(prompt, 0); |
| 523 | if (strcmp(password, retype) != 0) { |
| 524 | memset(password, 0, strlen(password)); |
| 525 | xfree(password); |
| 526 | log("Mismatch; try again, EOF to quit."); |
| 527 | password = NULL; |
| 528 | } |
| 529 | memset(retype, 0, strlen(retype)); |
| 530 | xfree(retype); |
| 531 | } |
| 532 | packet_put_cstring(password); |
| 533 | memset(password, 0, strlen(password)); |
| 534 | xfree(password); |
| 535 | packet_add_padding(64); |
| 536 | packet_send(); |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 537 | |
| 538 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 539 | &input_userauth_passwd_changereq); |
| 540 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 541 | |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 542 | static void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 543 | clear_auth_state(Authctxt *authctxt) |
| 544 | { |
| 545 | /* XXX clear authentication state */ |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 546 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, NULL); |
| 547 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 548 | if (authctxt->last_key != NULL && authctxt->last_key_hint == -1) { |
| 549 | debug3("clear_auth_state: key_free %p", authctxt->last_key); |
| 550 | key_free(authctxt->last_key); |
| 551 | } |
| 552 | authctxt->last_key = NULL; |
| 553 | authctxt->last_key_hint = -2; |
| 554 | authctxt->last_key_sign = NULL; |
| 555 | } |
| 556 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 557 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 558 | sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 559 | { |
| 560 | Buffer b; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 561 | u_char *blob, *signature; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 562 | u_int bloblen, slen; |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 563 | int skip = 0; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 564 | int ret = -1; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 565 | int have_sig = 1; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 566 | |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 567 | debug3("sign_and_send_pubkey"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 568 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 569 | if (key_to_blob(k, &blob, &bloblen) == 0) { |
| 570 | /* we cannot handle this key */ |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 571 | debug3("sign_and_send_pubkey: cannot handle key"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 572 | return 0; |
| 573 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 574 | /* data to be signed */ |
| 575 | buffer_init(&b); |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 576 | if (datafellows & SSH_OLD_SESSIONID) { |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 577 | buffer_append(&b, session_id2, session_id2_len); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 578 | skip = session_id2_len; |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 579 | } else { |
| 580 | buffer_put_string(&b, session_id2, session_id2_len); |
| 581 | skip = buffer_len(&b); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 582 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 583 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 584 | buffer_put_cstring(&b, authctxt->server_user); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 585 | buffer_put_cstring(&b, |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 586 | datafellows & SSH_BUG_PKSERVICE ? |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 587 | "ssh-userauth" : |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 588 | authctxt->service); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 589 | if (datafellows & SSH_BUG_PKAUTH) { |
| 590 | buffer_put_char(&b, have_sig); |
| 591 | } else { |
| 592 | buffer_put_cstring(&b, authctxt->method->name); |
| 593 | buffer_put_char(&b, have_sig); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 594 | buffer_put_cstring(&b, key_ssh_name(k)); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 595 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 596 | buffer_put_string(&b, blob, bloblen); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 597 | |
| 598 | /* generate signature */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 599 | ret = (*sign_callback)(authctxt, k, &signature, &slen, |
| 600 | buffer_ptr(&b), buffer_len(&b)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 601 | if (ret == -1) { |
| 602 | xfree(blob); |
| 603 | buffer_free(&b); |
| 604 | return 0; |
| 605 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 606 | #ifdef DEBUG_PK |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 607 | buffer_dump(&b); |
| 608 | #endif |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 609 | if (datafellows & SSH_BUG_PKSERVICE) { |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 610 | buffer_clear(&b); |
| 611 | buffer_append(&b, session_id2, session_id2_len); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 612 | skip = session_id2_len; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 613 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 614 | buffer_put_cstring(&b, authctxt->server_user); |
| 615 | buffer_put_cstring(&b, authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 616 | buffer_put_cstring(&b, authctxt->method->name); |
| 617 | buffer_put_char(&b, have_sig); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 618 | if (!(datafellows & SSH_BUG_PKAUTH)) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 619 | buffer_put_cstring(&b, key_ssh_name(k)); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 620 | buffer_put_string(&b, blob, bloblen); |
| 621 | } |
| 622 | xfree(blob); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 623 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 624 | /* append signature */ |
| 625 | buffer_put_string(&b, signature, slen); |
| 626 | xfree(signature); |
| 627 | |
| 628 | /* skip session id and packet type */ |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 629 | if (buffer_len(&b) < skip + 1) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 630 | fatal("userauth_pubkey: internal error"); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 631 | buffer_consume(&b, skip + 1); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 632 | |
| 633 | /* put remaining data from buffer into packet */ |
| 634 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 635 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); |
| 636 | buffer_free(&b); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 637 | packet_send(); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 638 | |
| 639 | return 1; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 640 | } |
| 641 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 642 | static int |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 643 | send_pubkey_test(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback, |
| 644 | int hint) |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 645 | { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 646 | u_char *blob; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 647 | u_int bloblen, have_sig = 0; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 648 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 649 | debug3("send_pubkey_test"); |
| 650 | |
| 651 | if (key_to_blob(k, &blob, &bloblen) == 0) { |
| 652 | /* we cannot handle this key */ |
| 653 | debug3("send_pubkey_test: cannot handle key"); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 654 | return 0; |
| 655 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 656 | /* register callback for USERAUTH_PK_OK message */ |
| 657 | authctxt->last_key_sign = sign_callback; |
| 658 | authctxt->last_key_hint = hint; |
| 659 | authctxt->last_key = k; |
| 660 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 661 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 662 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 663 | packet_put_cstring(authctxt->server_user); |
| 664 | packet_put_cstring(authctxt->service); |
| 665 | packet_put_cstring(authctxt->method->name); |
| 666 | packet_put_char(have_sig); |
| 667 | if (!(datafellows & SSH_BUG_PKAUTH)) |
| 668 | packet_put_cstring(key_ssh_name(k)); |
| 669 | packet_put_string(blob, bloblen); |
| 670 | xfree(blob); |
| 671 | packet_send(); |
| 672 | return 1; |
| 673 | } |
| 674 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 675 | static Key * |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 676 | load_identity_file(char *filename) |
| 677 | { |
| 678 | Key *private; |
| 679 | char prompt[300], *passphrase; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 680 | int quit, i; |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 681 | struct stat st; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 682 | |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 683 | if (stat(filename, &st) < 0) { |
| 684 | debug3("no such identity: %s", filename); |
| 685 | return NULL; |
| 686 | } |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 687 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL); |
| 688 | if (private == NULL) { |
| 689 | if (options.batch_mode) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 690 | return NULL; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 691 | snprintf(prompt, sizeof prompt, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 692 | "Enter passphrase for key '%.100s': ", filename); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 693 | for (i = 0; i < options.number_of_password_prompts; i++) { |
| 694 | passphrase = read_passphrase(prompt, 0); |
| 695 | if (strcmp(passphrase, "") != 0) { |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 696 | private = key_load_private_type(KEY_UNSPEC, filename, |
| 697 | passphrase, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 698 | quit = 0; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 699 | } else { |
| 700 | debug2("no passphrase given, try next key"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 701 | quit = 1; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 702 | } |
| 703 | memset(passphrase, 0, strlen(passphrase)); |
| 704 | xfree(passphrase); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 705 | if (private != NULL || quit) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 706 | break; |
| 707 | debug2("bad passphrase given, try again..."); |
| 708 | } |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 709 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 710 | return private; |
| 711 | } |
| 712 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 713 | static int |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 714 | identity_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
| 715 | u_char *data, u_int datalen) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 716 | { |
| 717 | Key *private; |
| 718 | int idx, ret; |
| 719 | |
| 720 | idx = authctxt->last_key_hint; |
| 721 | if (idx < 0) |
| 722 | return -1; |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 723 | |
| 724 | /* private key is stored in external hardware */ |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 725 | if (options.identity_keys[idx]->flags & KEY_FLAG_EXT) |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 726 | return key_sign(options.identity_keys[idx], sigp, lenp, data, datalen); |
| 727 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 728 | private = load_identity_file(options.identity_files[idx]); |
| 729 | if (private == NULL) |
| 730 | return -1; |
| 731 | ret = key_sign(private, sigp, lenp, data, datalen); |
| 732 | key_free(private); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 733 | return ret; |
| 734 | } |
| 735 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 736 | static int |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 737 | agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
| 738 | u_char *data, u_int datalen) |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 739 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 740 | return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 741 | } |
| 742 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 743 | static int |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 744 | key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
| 745 | u_char *data, u_int datalen) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 746 | { |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 747 | return key_sign(key, sigp, lenp, data, datalen); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 748 | } |
| 749 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 750 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 751 | userauth_pubkey_agent(Authctxt *authctxt) |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 752 | { |
| 753 | static int called = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 754 | int ret = 0; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 755 | char *comment; |
| 756 | Key *k; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 757 | |
| 758 | if (called == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 759 | if (ssh_get_num_identities(authctxt->agent, 2) == 0) |
| 760 | debug2("userauth_pubkey_agent: no keys at all"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 761 | called = 1; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 762 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 763 | k = ssh_get_next_identity(authctxt->agent, &comment, 2); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 764 | if (k == NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 765 | debug2("userauth_pubkey_agent: no more keys"); |
| 766 | } else { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 767 | debug("Offering agent key: %s", comment); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 768 | xfree(comment); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 769 | ret = send_pubkey_test(authctxt, k, agent_sign_cb, -1); |
| 770 | if (ret == 0) |
| 771 | key_free(k); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 772 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 773 | if (ret == 0) |
| 774 | debug2("userauth_pubkey_agent: no message sent"); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 775 | return ret; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 776 | } |
| 777 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 778 | int |
| 779 | userauth_pubkey(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 780 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 781 | static int idx = 0; |
| 782 | int sent = 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 783 | Key *key; |
| 784 | char *filename; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 785 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 786 | if (authctxt->agent != NULL) { |
| 787 | do { |
| 788 | sent = userauth_pubkey_agent(authctxt); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 789 | } while (!sent && authctxt->agent->howmany > 0); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 790 | } |
| 791 | while (!sent && idx < options.num_identity_files) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 792 | key = options.identity_keys[idx]; |
| 793 | filename = options.identity_files[idx]; |
| 794 | if (key == NULL) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 795 | debug("Trying private key: %s", filename); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 796 | key = load_identity_file(filename); |
| 797 | if (key != NULL) { |
| 798 | sent = sign_and_send_pubkey(authctxt, key, |
| 799 | key_sign_cb); |
| 800 | key_free(key); |
| 801 | } |
| 802 | } else if (key->type != KEY_RSA1) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 803 | debug("Offering public key: %s", filename); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 804 | sent = send_pubkey_test(authctxt, key, |
| 805 | identity_sign_cb, idx); |
| 806 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 807 | idx++; |
| 808 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 809 | return sent; |
| 810 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 811 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 812 | /* |
| 813 | * Send userauth request message specifying keyboard-interactive method. |
| 814 | */ |
| 815 | int |
| 816 | userauth_kbdint(Authctxt *authctxt) |
| 817 | { |
| 818 | static int attempt = 0; |
| 819 | |
| 820 | if (attempt++ >= options.number_of_password_prompts) |
| 821 | return 0; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 822 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
| 823 | if (attempt > 1 && !authctxt->info_req_seen) { |
| 824 | debug3("userauth_kbdint: disable: no info_req_seen"); |
| 825 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); |
| 826 | return 0; |
| 827 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 828 | |
| 829 | debug2("userauth_kbdint"); |
| 830 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 831 | packet_put_cstring(authctxt->server_user); |
| 832 | packet_put_cstring(authctxt->service); |
| 833 | packet_put_cstring(authctxt->method->name); |
| 834 | packet_put_cstring(""); /* lang */ |
| 835 | packet_put_cstring(options.kbd_interactive_devices ? |
| 836 | options.kbd_interactive_devices : ""); |
| 837 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 838 | |
| 839 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); |
| 840 | return 1; |
| 841 | } |
| 842 | |
| 843 | /* |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 844 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 845 | */ |
| 846 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 847 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 848 | { |
| 849 | Authctxt *authctxt = ctxt; |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 850 | char *name, *inst, *lang, *prompt, *response; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 851 | u_int num_prompts, i; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 852 | int echo = 0; |
| 853 | |
| 854 | debug2("input_userauth_info_req"); |
| 855 | |
| 856 | if (authctxt == NULL) |
| 857 | fatal("input_userauth_info_req: no authentication context"); |
| 858 | |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 859 | authctxt->info_req_seen = 1; |
| 860 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 861 | name = packet_get_string(NULL); |
| 862 | inst = packet_get_string(NULL); |
| 863 | lang = packet_get_string(NULL); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 864 | if (strlen(name) > 0) |
Ben Lindstrom | 126c56a | 2001-06-25 05:22:53 +0000 | [diff] [blame] | 865 | log("%s", name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 866 | if (strlen(inst) > 0) |
Ben Lindstrom | 126c56a | 2001-06-25 05:22:53 +0000 | [diff] [blame] | 867 | log("%s", inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 868 | xfree(name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 869 | xfree(inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 870 | xfree(lang); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 871 | |
| 872 | num_prompts = packet_get_int(); |
| 873 | /* |
| 874 | * Begin to build info response packet based on prompts requested. |
| 875 | * We commit to providing the correct number of responses, so if |
| 876 | * further on we run into a problem that prevents this, we have to |
| 877 | * be sure and clean this up and send a correct error response. |
| 878 | */ |
| 879 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); |
| 880 | packet_put_int(num_prompts); |
| 881 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 882 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 883 | for (i = 0; i < num_prompts; i++) { |
| 884 | prompt = packet_get_string(NULL); |
| 885 | echo = packet_get_char(); |
| 886 | |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 887 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 888 | |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 889 | packet_put_cstring(response); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 890 | memset(response, 0, strlen(response)); |
| 891 | xfree(response); |
| 892 | xfree(prompt); |
| 893 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 894 | packet_check_eom(); /* done with parsing incoming message. */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 895 | |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 896 | packet_add_padding(64); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 897 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 898 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 899 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 900 | static int |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 901 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 902 | u_char *data, u_int datalen) |
| 903 | { |
| 904 | Buffer b; |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 905 | struct stat st; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 906 | pid_t pid; |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 907 | int to[2], from[2], status, version = 2; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 908 | |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 909 | debug2("ssh_keysign called"); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 910 | |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 911 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
| 912 | error("ssh_keysign: no installed: %s", strerror(errno)); |
| 913 | return -1; |
| 914 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 915 | if (fflush(stdout) != 0) |
| 916 | error("ssh_keysign: fflush: %s", strerror(errno)); |
| 917 | if (pipe(to) < 0) { |
| 918 | error("ssh_keysign: pipe: %s", strerror(errno)); |
| 919 | return -1; |
| 920 | } |
| 921 | if (pipe(from) < 0) { |
| 922 | error("ssh_keysign: pipe: %s", strerror(errno)); |
| 923 | return -1; |
| 924 | } |
| 925 | if ((pid = fork()) < 0) { |
| 926 | error("ssh_keysign: fork: %s", strerror(errno)); |
| 927 | return -1; |
| 928 | } |
| 929 | if (pid == 0) { |
| 930 | seteuid(getuid()); |
| 931 | setuid(getuid()); |
| 932 | close(from[0]); |
| 933 | if (dup2(from[1], STDOUT_FILENO) < 0) |
| 934 | fatal("ssh_keysign: dup2: %s", strerror(errno)); |
| 935 | close(to[1]); |
| 936 | if (dup2(to[0], STDIN_FILENO) < 0) |
| 937 | fatal("ssh_keysign: dup2: %s", strerror(errno)); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 938 | close(from[1]); |
| 939 | close(to[0]); |
Ben Lindstrom | 4887da2 | 2002-06-06 20:05:57 +0000 | [diff] [blame] | 940 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 941 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
| 942 | strerror(errno)); |
| 943 | } |
| 944 | close(from[1]); |
| 945 | close(to[0]); |
| 946 | |
| 947 | buffer_init(&b); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 948 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 949 | buffer_put_string(&b, data, datalen); |
Damien Miller | 901119b | 2002-10-04 11:10:04 +1000 | [diff] [blame] | 950 | ssh_msg_send(to[1], version, &b); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 951 | |
Damien Miller | 901119b | 2002-10-04 11:10:04 +1000 | [diff] [blame] | 952 | if (ssh_msg_recv(from[0], &b) < 0) { |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 953 | error("ssh_keysign: no reply"); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 954 | buffer_clear(&b); |
| 955 | return -1; |
| 956 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 957 | close(from[0]); |
| 958 | close(to[1]); |
| 959 | |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 960 | while (waitpid(pid, &status, 0) < 0) |
| 961 | if (errno != EINTR) |
| 962 | break; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 963 | |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 964 | if (buffer_get_char(&b) != version) { |
| 965 | error("ssh_keysign: bad version"); |
| 966 | buffer_clear(&b); |
| 967 | return -1; |
| 968 | } |
| 969 | *sigp = buffer_get_string(&b, lenp); |
| 970 | buffer_clear(&b); |
| 971 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 972 | return 0; |
| 973 | } |
| 974 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 975 | int |
| 976 | userauth_hostbased(Authctxt *authctxt) |
| 977 | { |
| 978 | Key *private = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 979 | Sensitive *sensitive = authctxt->sensitive; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 980 | Buffer b; |
| 981 | u_char *signature, *blob; |
| 982 | char *chost, *pkalg, *p; |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 983 | const char *service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 984 | u_int blen, slen; |
Ben Lindstrom | 2bffd6f | 2001-04-19 20:35:40 +0000 | [diff] [blame] | 985 | int ok, i, len, found = 0; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 986 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 987 | /* check for a useful key */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 988 | for (i = 0; i < sensitive->nkeys; i++) { |
| 989 | private = sensitive->keys[i]; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 990 | if (private && private->type != KEY_RSA1) { |
| 991 | found = 1; |
| 992 | /* we take and free the key */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 993 | sensitive->keys[i] = NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 994 | break; |
| 995 | } |
| 996 | } |
| 997 | if (!found) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 998 | debug("No more client hostkeys for hostbased authentication."); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 999 | return 0; |
| 1000 | } |
| 1001 | if (key_to_blob(private, &blob, &blen) == 0) { |
| 1002 | key_free(private); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1003 | return 0; |
| 1004 | } |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1005 | /* figure out a name for the client host */ |
| 1006 | p = get_local_name(packet_get_connection_in()); |
| 1007 | if (p == NULL) { |
| 1008 | error("userauth_hostbased: cannot get local ipaddr/name"); |
| 1009 | key_free(private); |
| 1010 | return 0; |
| 1011 | } |
| 1012 | len = strlen(p) + 2; |
| 1013 | chost = xmalloc(len); |
| 1014 | strlcpy(chost, p, len); |
| 1015 | strlcat(chost, ".", len); |
| 1016 | debug2("userauth_hostbased: chost %s", chost); |
| 1017 | |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1018 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
| 1019 | authctxt->service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1020 | pkalg = xstrdup(key_ssh_name(private)); |
| 1021 | buffer_init(&b); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1022 | /* construct data */ |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1023 | buffer_put_string(&b, session_id2, session_id2_len); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1024 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
| 1025 | buffer_put_cstring(&b, authctxt->server_user); |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1026 | buffer_put_cstring(&b, service); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1027 | buffer_put_cstring(&b, authctxt->method->name); |
| 1028 | buffer_put_cstring(&b, pkalg); |
| 1029 | buffer_put_string(&b, blob, blen); |
| 1030 | buffer_put_cstring(&b, chost); |
| 1031 | buffer_put_cstring(&b, authctxt->local_user); |
| 1032 | #ifdef DEBUG_PK |
| 1033 | buffer_dump(&b); |
| 1034 | #endif |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1035 | if (sensitive->external_keysign) |
| 1036 | ok = ssh_keysign(private, &signature, &slen, |
| 1037 | buffer_ptr(&b), buffer_len(&b)); |
| 1038 | else |
| 1039 | ok = key_sign(private, &signature, &slen, |
| 1040 | buffer_ptr(&b), buffer_len(&b)); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1041 | key_free(private); |
| 1042 | buffer_free(&b); |
| 1043 | if (ok != 0) { |
| 1044 | error("key_sign failed"); |
| 1045 | xfree(chost); |
| 1046 | xfree(pkalg); |
| 1047 | return 0; |
| 1048 | } |
| 1049 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 1050 | packet_put_cstring(authctxt->server_user); |
| 1051 | packet_put_cstring(authctxt->service); |
| 1052 | packet_put_cstring(authctxt->method->name); |
| 1053 | packet_put_cstring(pkalg); |
| 1054 | packet_put_string(blob, blen); |
| 1055 | packet_put_cstring(chost); |
| 1056 | packet_put_cstring(authctxt->local_user); |
| 1057 | packet_put_string(signature, slen); |
| 1058 | memset(signature, 's', slen); |
| 1059 | xfree(signature); |
| 1060 | xfree(chost); |
| 1061 | xfree(pkalg); |
| 1062 | |
| 1063 | packet_send(); |
| 1064 | return 1; |
| 1065 | } |
| 1066 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1067 | /* find auth method */ |
| 1068 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1069 | /* |
| 1070 | * given auth method name, if configurable options permit this method fill |
| 1071 | * in auth_ident field and return true, otherwise return false. |
| 1072 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1073 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1074 | authmethod_is_enabled(Authmethod *method) |
| 1075 | { |
| 1076 | if (method == NULL) |
| 1077 | return 0; |
| 1078 | /* return false if options indicate this method is disabled */ |
| 1079 | if (method->enabled == NULL || *method->enabled == 0) |
| 1080 | return 0; |
| 1081 | /* return false if batch mode is enabled but method needs interactive mode */ |
| 1082 | if (method->batch_flag != NULL && *method->batch_flag != 0) |
| 1083 | return 0; |
| 1084 | return 1; |
| 1085 | } |
| 1086 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1087 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1088 | authmethod_lookup(const char *name) |
| 1089 | { |
| 1090 | Authmethod *method = NULL; |
| 1091 | if (name != NULL) |
| 1092 | for (method = authmethods; method->name != NULL; method++) |
| 1093 | if (strcmp(name, method->name) == 0) |
| 1094 | return method; |
| 1095 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); |
| 1096 | return NULL; |
| 1097 | } |
| 1098 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1099 | /* XXX internal state */ |
| 1100 | static Authmethod *current = NULL; |
| 1101 | static char *supported = NULL; |
| 1102 | static char *preferred = NULL; |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 1103 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1104 | /* |
| 1105 | * Given the authentication method list sent by the server, return the |
| 1106 | * 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] | 1107 | * use a built-in default list. |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1108 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1109 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1110 | authmethod_get(char *authlist) |
| 1111 | { |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1112 | char *name = NULL; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 1113 | u_int next; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1114 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1115 | /* Use a suitable default if we're passed a nil list. */ |
| 1116 | if (authlist == NULL || strlen(authlist) == 0) |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1117 | authlist = options.preferred_authentications; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1118 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1119 | if (supported == NULL || strcmp(authlist, supported) != 0) { |
| 1120 | debug3("start over, passed a different list %s", authlist); |
| 1121 | if (supported != NULL) |
| 1122 | xfree(supported); |
| 1123 | supported = xstrdup(authlist); |
| 1124 | preferred = options.preferred_authentications; |
| 1125 | debug3("preferred %s", preferred); |
| 1126 | current = NULL; |
| 1127 | } else if (current != NULL && authmethod_is_enabled(current)) |
| 1128 | return current; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1129 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1130 | for (;;) { |
| 1131 | if ((name = match_list(preferred, supported, &next)) == NULL) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1132 | debug("No more authentication methods to try."); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1133 | current = NULL; |
| 1134 | return NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1135 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1136 | preferred += next; |
| 1137 | debug3("authmethod_lookup %s", name); |
| 1138 | debug3("remaining preferred: %s", preferred); |
| 1139 | if ((current = authmethod_lookup(name)) != NULL && |
| 1140 | authmethod_is_enabled(current)) { |
| 1141 | debug3("authmethod_is_enabled %s", name); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1142 | debug("Next authentication method: %s", name); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1143 | return current; |
| 1144 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1145 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1146 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1147 | |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 1148 | static char * |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1149 | authmethods_get(void) |
| 1150 | { |
| 1151 | Authmethod *method = NULL; |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1152 | Buffer b; |
| 1153 | char *list; |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1154 | |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1155 | buffer_init(&b); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1156 | for (method = authmethods; method->name != NULL; method++) { |
| 1157 | if (authmethod_is_enabled(method)) { |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1158 | if (buffer_len(&b) > 0) |
| 1159 | buffer_append(&b, ",", 1); |
| 1160 | buffer_append(&b, method->name, strlen(method->name)); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1161 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1162 | } |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1163 | buffer_append(&b, "\0", 1); |
| 1164 | list = xstrdup(buffer_ptr(&b)); |
| 1165 | buffer_free(&b); |
| 1166 | return list; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1167 | } |