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 | d558092 | 2003-05-14 13:40:06 +1000 | [diff] [blame] | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.116 2003/04/08 20:21:29 itojun 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) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 85 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 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 | |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 111 | if (options.rekey_limit) |
| 112 | packet_set_rekey_limit(options.rekey_limit); |
| 113 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 114 | /* start key exchange */ |
Ben Lindstrom | 238abf6 | 2001-04-04 17:52:53 +0000 | [diff] [blame] | 115 | kex = kex_setup(myproposal); |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 116 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
| 117 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 118 | kex->client_version_string=client_version_string; |
| 119 | kex->server_version_string=server_version_string; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 120 | kex->verify_host_key=&verify_host_key_callback; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 121 | |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 122 | xxx_kex = kex; |
| 123 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 124 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 125 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 126 | session_id2 = kex->session_id; |
| 127 | session_id2_len = kex->session_id_len; |
| 128 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 129 | #ifdef DEBUG_KEXDH |
| 130 | /* send 1st encrypted/maced/compressed message */ |
| 131 | packet_start(SSH2_MSG_IGNORE); |
| 132 | packet_put_cstring("markus"); |
| 133 | packet_send(); |
| 134 | packet_write_wait(); |
| 135 | #endif |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 136 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 137 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 138 | /* |
| 139 | * Authenticate user |
| 140 | */ |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 141 | |
| 142 | typedef struct Authctxt Authctxt; |
| 143 | typedef struct Authmethod Authmethod; |
| 144 | |
| 145 | typedef int sign_cb_fn( |
| 146 | Authctxt *authctxt, Key *key, |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 147 | u_char **sigp, u_int *lenp, u_char *data, u_int datalen); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 148 | |
| 149 | struct Authctxt { |
| 150 | const char *server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 151 | const char *local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 152 | const char *host; |
| 153 | const char *service; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 154 | Authmethod *method; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 155 | int success; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 156 | char *authlist; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 157 | /* pubkey */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 158 | Key *last_key; |
| 159 | sign_cb_fn *last_key_sign; |
| 160 | int last_key_hint; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 161 | AuthenticationConnection *agent; |
| 162 | /* hostbased */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 163 | Sensitive *sensitive; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 164 | /* kbd-interactive */ |
| 165 | int info_req_seen; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 166 | }; |
| 167 | struct Authmethod { |
| 168 | char *name; /* string to compare against server's list */ |
| 169 | int (*userauth)(Authctxt *authctxt); |
| 170 | int *enabled; /* flag in option struct that enables method */ |
| 171 | int *batch_flag; /* flag in option struct that disables method */ |
| 172 | }; |
| 173 | |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 174 | void input_userauth_success(int, u_int32_t, void *); |
| 175 | void input_userauth_failure(int, u_int32_t, void *); |
| 176 | void input_userauth_banner(int, u_int32_t, void *); |
| 177 | void input_userauth_error(int, u_int32_t, void *); |
| 178 | void input_userauth_info_req(int, u_int32_t, void *); |
| 179 | void input_userauth_pk_ok(int, u_int32_t, void *); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 180 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 181 | |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 182 | int userauth_none(Authctxt *); |
| 183 | int userauth_pubkey(Authctxt *); |
| 184 | int userauth_passwd(Authctxt *); |
| 185 | int userauth_kbdint(Authctxt *); |
| 186 | int userauth_hostbased(Authctxt *); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 187 | |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 188 | void userauth(Authctxt *, char *); |
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 int sign_and_send_pubkey(Authctxt *, Key *, sign_cb_fn *); |
| 191 | static void clear_auth_state(Authctxt *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 192 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 193 | static Authmethod *authmethod_get(char *authlist); |
| 194 | static Authmethod *authmethod_lookup(const char *name); |
| 195 | static char *authmethods_get(void); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 196 | |
| 197 | Authmethod authmethods[] = { |
Ben Lindstrom | 1bfe291 | 2001-06-05 19:37:25 +0000 | [diff] [blame] | 198 | {"hostbased", |
| 199 | userauth_hostbased, |
| 200 | &options.hostbased_authentication, |
| 201 | NULL}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 202 | {"publickey", |
| 203 | userauth_pubkey, |
| 204 | &options.pubkey_authentication, |
| 205 | NULL}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 206 | {"keyboard-interactive", |
| 207 | userauth_kbdint, |
| 208 | &options.kbd_interactive_authentication, |
| 209 | &options.batch_mode}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 210 | {"password", |
| 211 | userauth_passwd, |
| 212 | &options.password_authentication, |
| 213 | &options.batch_mode}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 214 | {"none", |
| 215 | userauth_none, |
| 216 | NULL, |
| 217 | NULL}, |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 218 | {NULL, NULL, NULL, NULL} |
| 219 | }; |
| 220 | |
| 221 | void |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 222 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 223 | Sensitive *sensitive) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 224 | { |
| 225 | Authctxt authctxt; |
| 226 | int type; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 227 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 228 | if (options.challenge_response_authentication) |
Ben Lindstrom | 95fb2dd | 2001-01-23 03:12:10 +0000 | [diff] [blame] | 229 | options.kbd_interactive_authentication = 1; |
| 230 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 231 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
| 232 | packet_put_cstring("ssh-userauth"); |
| 233 | packet_send(); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 234 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 235 | packet_write_wait(); |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 236 | type = packet_read(); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 237 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
| 238 | fatal("Server denied authentication request: %d", type); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 239 | if (packet_remaining() > 0) { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 240 | char *reply = packet_get_string(NULL); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 241 | debug2("service_accept: %s", reply); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 242 | xfree(reply); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 243 | } else { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 244 | debug2("buggy server: service_accept w/o service"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 245 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 246 | packet_check_eom(); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 247 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 248 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 249 | if (options.preferred_authentications == NULL) |
| 250 | options.preferred_authentications = authmethods_get(); |
| 251 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 252 | /* setup authentication context */ |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 253 | memset(&authctxt, 0, sizeof(authctxt)); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 254 | authctxt.agent = ssh_get_authentication_connection(); |
| 255 | authctxt.server_user = server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 256 | authctxt.local_user = local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 257 | authctxt.host = host; |
| 258 | authctxt.service = "ssh-connection"; /* service name */ |
| 259 | authctxt.success = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 260 | authctxt.method = authmethod_lookup("none"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 261 | authctxt.authlist = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 262 | authctxt.sensitive = sensitive; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 263 | authctxt.info_req_seen = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 264 | if (authctxt.method == NULL) |
| 265 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 266 | |
| 267 | /* initial userauth request */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 268 | userauth_none(&authctxt); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 269 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 270 | dispatch_init(&input_userauth_error); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 271 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
| 272 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 273 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 274 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
| 275 | |
| 276 | if (authctxt.agent != NULL) |
| 277 | ssh_close_authentication_connection(authctxt.agent); |
| 278 | |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 279 | debug("Authentication succeeded (%s).", authctxt.method->name); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 280 | } |
| 281 | void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 282 | userauth(Authctxt *authctxt, char *authlist) |
| 283 | { |
| 284 | if (authlist == NULL) { |
| 285 | authlist = authctxt->authlist; |
| 286 | } else { |
| 287 | if (authctxt->authlist) |
| 288 | xfree(authctxt->authlist); |
| 289 | authctxt->authlist = authlist; |
| 290 | } |
| 291 | for (;;) { |
| 292 | Authmethod *method = authmethod_get(authlist); |
| 293 | if (method == NULL) |
| 294 | fatal("Permission denied (%s).", authlist); |
| 295 | authctxt->method = method; |
| 296 | if (method->userauth(authctxt) != 0) { |
| 297 | debug2("we sent a %s packet, wait for reply", method->name); |
| 298 | break; |
| 299 | } else { |
| 300 | debug2("we did not send a packet, disable method"); |
| 301 | method->enabled = NULL; |
| 302 | } |
| 303 | } |
| 304 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 305 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 306 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 307 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 308 | { |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 309 | fatal("input_userauth_error: bad message during authentication: " |
| 310 | "type %d", type); |
| 311 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 312 | |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 313 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 314 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 315 | { |
| 316 | char *msg, *lang; |
| 317 | debug3("input_userauth_banner"); |
| 318 | msg = packet_get_string(NULL); |
| 319 | lang = packet_get_string(NULL); |
| 320 | fprintf(stderr, "%s", msg); |
| 321 | xfree(msg); |
| 322 | xfree(lang); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 323 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 324 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 325 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 326 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 327 | { |
| 328 | Authctxt *authctxt = ctxt; |
| 329 | if (authctxt == NULL) |
| 330 | fatal("input_userauth_success: no authentication context"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 331 | if (authctxt->authlist) |
| 332 | xfree(authctxt->authlist); |
| 333 | clear_auth_state(authctxt); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 334 | authctxt->success = 1; /* break out */ |
| 335 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 336 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 337 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 338 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 339 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 340 | Authctxt *authctxt = ctxt; |
| 341 | char *authlist = NULL; |
| 342 | int partial; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 343 | |
| 344 | if (authctxt == NULL) |
| 345 | fatal("input_userauth_failure: no authentication context"); |
| 346 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 347 | authlist = packet_get_string(NULL); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 348 | partial = packet_get_char(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 349 | packet_check_eom(); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 350 | |
| 351 | if (partial != 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 352 | logit("Authenticated with partial success."); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 353 | debug("Authentications that can continue: %s", authlist); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 354 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 355 | clear_auth_state(authctxt); |
| 356 | userauth(authctxt, authlist); |
| 357 | } |
| 358 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 359 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 360 | { |
| 361 | Authctxt *authctxt = ctxt; |
| 362 | Key *key = NULL; |
| 363 | Buffer b; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 364 | int pktype, sent = 0; |
| 365 | u_int alen, blen; |
| 366 | char *pkalg, *fp; |
| 367 | u_char *pkblob; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 368 | |
| 369 | if (authctxt == NULL) |
| 370 | fatal("input_userauth_pk_ok: no authentication context"); |
| 371 | if (datafellows & SSH_BUG_PKOK) { |
| 372 | /* this is similar to SSH_BUG_PKAUTH */ |
| 373 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); |
| 374 | pkblob = packet_get_string(&blen); |
| 375 | buffer_init(&b); |
| 376 | buffer_append(&b, pkblob, blen); |
| 377 | pkalg = buffer_get_string(&b, &alen); |
| 378 | buffer_free(&b); |
| 379 | } else { |
| 380 | pkalg = packet_get_string(&alen); |
| 381 | pkblob = packet_get_string(&blen); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 382 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 383 | packet_check_eom(); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 384 | |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 385 | debug("Server accepts key: pkalg %s blen %u lastkey %p hint %d", |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 386 | pkalg, blen, authctxt->last_key, authctxt->last_key_hint); |
| 387 | |
| 388 | do { |
| 389 | if (authctxt->last_key == NULL || |
| 390 | authctxt->last_key_sign == NULL) { |
| 391 | debug("no last key or no sign cb"); |
| 392 | break; |
| 393 | } |
Damien Miller | 68f4598 | 2002-02-05 12:23:32 +1100 | [diff] [blame] | 394 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 395 | debug("unknown pkalg %s", pkalg); |
| 396 | break; |
| 397 | } |
| 398 | if ((key = key_from_blob(pkblob, blen)) == NULL) { |
| 399 | debug("no key from blob. pkalg %s", pkalg); |
| 400 | break; |
| 401 | } |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 402 | if (key->type != pktype) { |
Damien Miller | 68f4598 | 2002-02-05 12:23:32 +1100 | [diff] [blame] | 403 | error("input_userauth_pk_ok: type mismatch " |
| 404 | "for decoded key (received %d, expected %d)", |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 405 | key->type, pktype); |
Damien Miller | 68f4598 | 2002-02-05 12:23:32 +1100 | [diff] [blame] | 406 | break; |
| 407 | } |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 408 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); |
| 409 | debug2("input_userauth_pk_ok: fp %s", fp); |
| 410 | xfree(fp); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 411 | if (!key_equal(key, authctxt->last_key)) { |
| 412 | debug("key != last_key"); |
| 413 | break; |
| 414 | } |
| 415 | sent = sign_and_send_pubkey(authctxt, key, |
| 416 | authctxt->last_key_sign); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 417 | } while (0); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 418 | |
| 419 | if (key != NULL) |
| 420 | key_free(key); |
| 421 | xfree(pkalg); |
| 422 | xfree(pkblob); |
| 423 | |
| 424 | /* unregister */ |
| 425 | clear_auth_state(authctxt); |
| 426 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, NULL); |
| 427 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 428 | /* try another method if we did not send a packet */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 429 | if (sent == 0) |
| 430 | userauth(authctxt, NULL); |
| 431 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 432 | } |
| 433 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 434 | int |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 435 | userauth_none(Authctxt *authctxt) |
| 436 | { |
| 437 | /* initial userauth request */ |
| 438 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 439 | packet_put_cstring(authctxt->server_user); |
| 440 | packet_put_cstring(authctxt->service); |
| 441 | packet_put_cstring(authctxt->method->name); |
| 442 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 443 | return 1; |
| 444 | } |
| 445 | |
| 446 | int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 447 | userauth_passwd(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 448 | { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 449 | static int attempt = 0; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 450 | char prompt[150]; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 451 | char *password; |
| 452 | |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 453 | if (attempt++ >= options.number_of_password_prompts) |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 454 | return 0; |
| 455 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 456 | if (attempt != 1) |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 457 | error("Permission denied, please try again."); |
| 458 | |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 459 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 460 | authctxt->server_user, authctxt->host); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 461 | password = read_passphrase(prompt, 0); |
| 462 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 463 | packet_put_cstring(authctxt->server_user); |
| 464 | packet_put_cstring(authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 465 | packet_put_cstring(authctxt->method->name); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 466 | packet_put_char(0); |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 467 | packet_put_cstring(password); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 468 | memset(password, 0, strlen(password)); |
| 469 | xfree(password); |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 470 | packet_add_padding(64); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 471 | packet_send(); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 472 | |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 473 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 474 | &input_userauth_passwd_changereq); |
| 475 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 476 | return 1; |
| 477 | } |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 478 | /* |
| 479 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST |
| 480 | */ |
| 481 | void |
Tim Rice | c854962 | 2002-03-31 12:49:38 -0800 | [diff] [blame] | 482 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 483 | { |
| 484 | Authctxt *authctxt = ctxt; |
| 485 | char *info, *lang, *password = NULL, *retype = NULL; |
| 486 | char prompt[150]; |
| 487 | |
| 488 | debug2("input_userauth_passwd_changereq"); |
| 489 | |
| 490 | if (authctxt == NULL) |
| 491 | fatal("input_userauth_passwd_changereq: " |
| 492 | "no authentication context"); |
| 493 | |
| 494 | info = packet_get_string(NULL); |
| 495 | lang = packet_get_string(NULL); |
| 496 | if (strlen(info) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 497 | logit("%s", info); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 498 | xfree(info); |
| 499 | xfree(lang); |
| 500 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 501 | packet_put_cstring(authctxt->server_user); |
| 502 | packet_put_cstring(authctxt->service); |
| 503 | packet_put_cstring(authctxt->method->name); |
| 504 | packet_put_char(1); /* additional info */ |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 505 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 506 | "Enter %.30s@%.128s's old password: ", |
| 507 | authctxt->server_user, authctxt->host); |
| 508 | password = read_passphrase(prompt, 0); |
| 509 | packet_put_cstring(password); |
| 510 | memset(password, 0, strlen(password)); |
| 511 | xfree(password); |
| 512 | password = NULL; |
| 513 | while (password == NULL) { |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 514 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 515 | "Enter %.30s@%.128s's new password: ", |
| 516 | authctxt->server_user, authctxt->host); |
| 517 | password = read_passphrase(prompt, RP_ALLOW_EOF); |
| 518 | if (password == NULL) { |
| 519 | /* bail out */ |
| 520 | return; |
| 521 | } |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 522 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 523 | "Retype %.30s@%.128s's new password: ", |
| 524 | authctxt->server_user, authctxt->host); |
| 525 | retype = read_passphrase(prompt, 0); |
| 526 | if (strcmp(password, retype) != 0) { |
| 527 | memset(password, 0, strlen(password)); |
| 528 | xfree(password); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 529 | logit("Mismatch; try again, EOF to quit."); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 530 | password = NULL; |
| 531 | } |
| 532 | memset(retype, 0, strlen(retype)); |
| 533 | xfree(retype); |
| 534 | } |
| 535 | packet_put_cstring(password); |
| 536 | memset(password, 0, strlen(password)); |
| 537 | xfree(password); |
| 538 | packet_add_padding(64); |
| 539 | packet_send(); |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 540 | |
| 541 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 542 | &input_userauth_passwd_changereq); |
| 543 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 544 | |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 545 | static void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 546 | clear_auth_state(Authctxt *authctxt) |
| 547 | { |
| 548 | /* XXX clear authentication state */ |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 549 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, NULL); |
| 550 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 551 | if (authctxt->last_key != NULL && authctxt->last_key_hint == -1) { |
| 552 | debug3("clear_auth_state: key_free %p", authctxt->last_key); |
| 553 | key_free(authctxt->last_key); |
| 554 | } |
| 555 | authctxt->last_key = NULL; |
| 556 | authctxt->last_key_hint = -2; |
| 557 | authctxt->last_key_sign = NULL; |
| 558 | } |
| 559 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 560 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 561 | 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] | 562 | { |
| 563 | Buffer b; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 564 | u_char *blob, *signature; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 565 | u_int bloblen, slen; |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 566 | int skip = 0; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 567 | int ret = -1; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 568 | int have_sig = 1; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 569 | |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 570 | debug3("sign_and_send_pubkey"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 571 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 572 | if (key_to_blob(k, &blob, &bloblen) == 0) { |
| 573 | /* we cannot handle this key */ |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 574 | debug3("sign_and_send_pubkey: cannot handle key"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 575 | return 0; |
| 576 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 577 | /* data to be signed */ |
| 578 | buffer_init(&b); |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 579 | if (datafellows & SSH_OLD_SESSIONID) { |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 580 | buffer_append(&b, session_id2, session_id2_len); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 581 | skip = session_id2_len; |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 582 | } else { |
| 583 | buffer_put_string(&b, session_id2, session_id2_len); |
| 584 | skip = buffer_len(&b); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 585 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 586 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 587 | buffer_put_cstring(&b, authctxt->server_user); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 588 | buffer_put_cstring(&b, |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 589 | datafellows & SSH_BUG_PKSERVICE ? |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 590 | "ssh-userauth" : |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 591 | authctxt->service); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 592 | if (datafellows & SSH_BUG_PKAUTH) { |
| 593 | buffer_put_char(&b, have_sig); |
| 594 | } else { |
| 595 | buffer_put_cstring(&b, authctxt->method->name); |
| 596 | buffer_put_char(&b, have_sig); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 597 | buffer_put_cstring(&b, key_ssh_name(k)); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 598 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 599 | buffer_put_string(&b, blob, bloblen); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 600 | |
| 601 | /* generate signature */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 602 | ret = (*sign_callback)(authctxt, k, &signature, &slen, |
| 603 | buffer_ptr(&b), buffer_len(&b)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 604 | if (ret == -1) { |
| 605 | xfree(blob); |
| 606 | buffer_free(&b); |
| 607 | return 0; |
| 608 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 609 | #ifdef DEBUG_PK |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 610 | buffer_dump(&b); |
| 611 | #endif |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 612 | if (datafellows & SSH_BUG_PKSERVICE) { |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 613 | buffer_clear(&b); |
| 614 | buffer_append(&b, session_id2, session_id2_len); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 615 | skip = session_id2_len; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 616 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 617 | buffer_put_cstring(&b, authctxt->server_user); |
| 618 | buffer_put_cstring(&b, authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 619 | buffer_put_cstring(&b, authctxt->method->name); |
| 620 | buffer_put_char(&b, have_sig); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 621 | if (!(datafellows & SSH_BUG_PKAUTH)) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 622 | buffer_put_cstring(&b, key_ssh_name(k)); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 623 | buffer_put_string(&b, blob, bloblen); |
| 624 | } |
| 625 | xfree(blob); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 626 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 627 | /* append signature */ |
| 628 | buffer_put_string(&b, signature, slen); |
| 629 | xfree(signature); |
| 630 | |
| 631 | /* skip session id and packet type */ |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 632 | if (buffer_len(&b) < skip + 1) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 633 | fatal("userauth_pubkey: internal error"); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 634 | buffer_consume(&b, skip + 1); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 635 | |
| 636 | /* put remaining data from buffer into packet */ |
| 637 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 638 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); |
| 639 | buffer_free(&b); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 640 | packet_send(); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 641 | |
| 642 | return 1; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 643 | } |
| 644 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 645 | static int |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 646 | send_pubkey_test(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback, |
| 647 | int hint) |
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 | u_char *blob; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 650 | u_int bloblen, have_sig = 0; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 651 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 652 | debug3("send_pubkey_test"); |
| 653 | |
| 654 | if (key_to_blob(k, &blob, &bloblen) == 0) { |
| 655 | /* we cannot handle this key */ |
| 656 | debug3("send_pubkey_test: cannot handle key"); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 657 | return 0; |
| 658 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 659 | /* register callback for USERAUTH_PK_OK message */ |
| 660 | authctxt->last_key_sign = sign_callback; |
| 661 | authctxt->last_key_hint = hint; |
| 662 | authctxt->last_key = k; |
| 663 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 664 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 665 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 666 | packet_put_cstring(authctxt->server_user); |
| 667 | packet_put_cstring(authctxt->service); |
| 668 | packet_put_cstring(authctxt->method->name); |
| 669 | packet_put_char(have_sig); |
| 670 | if (!(datafellows & SSH_BUG_PKAUTH)) |
| 671 | packet_put_cstring(key_ssh_name(k)); |
| 672 | packet_put_string(blob, bloblen); |
| 673 | xfree(blob); |
| 674 | packet_send(); |
| 675 | return 1; |
| 676 | } |
| 677 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 678 | static Key * |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 679 | load_identity_file(char *filename) |
| 680 | { |
| 681 | Key *private; |
| 682 | char prompt[300], *passphrase; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 683 | int quit, i; |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 684 | struct stat st; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 685 | |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 686 | if (stat(filename, &st) < 0) { |
| 687 | debug3("no such identity: %s", filename); |
| 688 | return NULL; |
| 689 | } |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 690 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL); |
| 691 | if (private == NULL) { |
| 692 | if (options.batch_mode) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 693 | return NULL; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 694 | snprintf(prompt, sizeof prompt, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 695 | "Enter passphrase for key '%.100s': ", filename); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 696 | for (i = 0; i < options.number_of_password_prompts; i++) { |
| 697 | passphrase = read_passphrase(prompt, 0); |
| 698 | if (strcmp(passphrase, "") != 0) { |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 699 | private = key_load_private_type(KEY_UNSPEC, filename, |
| 700 | passphrase, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 701 | quit = 0; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 702 | } else { |
| 703 | debug2("no passphrase given, try next key"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 704 | quit = 1; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 705 | } |
| 706 | memset(passphrase, 0, strlen(passphrase)); |
| 707 | xfree(passphrase); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 708 | if (private != NULL || quit) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 709 | break; |
| 710 | debug2("bad passphrase given, try again..."); |
| 711 | } |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 712 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 713 | return private; |
| 714 | } |
| 715 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 716 | static int |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 717 | identity_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
| 718 | u_char *data, u_int datalen) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 719 | { |
| 720 | Key *private; |
| 721 | int idx, ret; |
| 722 | |
| 723 | idx = authctxt->last_key_hint; |
| 724 | if (idx < 0) |
| 725 | return -1; |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 726 | |
| 727 | /* private key is stored in external hardware */ |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 728 | if (options.identity_keys[idx]->flags & KEY_FLAG_EXT) |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 729 | return key_sign(options.identity_keys[idx], sigp, lenp, data, datalen); |
| 730 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 731 | private = load_identity_file(options.identity_files[idx]); |
| 732 | if (private == NULL) |
| 733 | return -1; |
| 734 | ret = key_sign(private, sigp, lenp, data, datalen); |
| 735 | key_free(private); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 736 | return ret; |
| 737 | } |
| 738 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 739 | static int |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 740 | agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
| 741 | u_char *data, u_int datalen) |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 742 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 743 | return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 744 | } |
| 745 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 746 | static int |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 747 | key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
| 748 | u_char *data, u_int datalen) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 749 | { |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 750 | return key_sign(key, sigp, lenp, data, datalen); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 751 | } |
| 752 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 753 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 754 | userauth_pubkey_agent(Authctxt *authctxt) |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 755 | { |
| 756 | static int called = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 757 | int ret = 0; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 758 | char *comment; |
| 759 | Key *k; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 760 | |
| 761 | if (called == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 762 | if (ssh_get_num_identities(authctxt->agent, 2) == 0) |
| 763 | debug2("userauth_pubkey_agent: no keys at all"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 764 | called = 1; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 765 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 766 | k = ssh_get_next_identity(authctxt->agent, &comment, 2); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 767 | if (k == NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 768 | debug2("userauth_pubkey_agent: no more keys"); |
| 769 | } else { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 770 | debug("Offering agent key: %s", comment); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 771 | xfree(comment); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 772 | ret = send_pubkey_test(authctxt, k, agent_sign_cb, -1); |
| 773 | if (ret == 0) |
| 774 | key_free(k); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 775 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 776 | if (ret == 0) |
| 777 | debug2("userauth_pubkey_agent: no message sent"); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 778 | return ret; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 779 | } |
| 780 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 781 | int |
| 782 | userauth_pubkey(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 783 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 784 | static int idx = 0; |
| 785 | int sent = 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 786 | Key *key; |
| 787 | char *filename; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 788 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 789 | if (authctxt->agent != NULL) { |
| 790 | do { |
| 791 | sent = userauth_pubkey_agent(authctxt); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 792 | } while (!sent && authctxt->agent->howmany > 0); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 793 | } |
| 794 | while (!sent && idx < options.num_identity_files) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 795 | key = options.identity_keys[idx]; |
| 796 | filename = options.identity_files[idx]; |
| 797 | if (key == NULL) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 798 | debug("Trying private key: %s", filename); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 799 | key = load_identity_file(filename); |
| 800 | if (key != NULL) { |
| 801 | sent = sign_and_send_pubkey(authctxt, key, |
| 802 | key_sign_cb); |
| 803 | key_free(key); |
| 804 | } |
| 805 | } else if (key->type != KEY_RSA1) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 806 | debug("Offering public key: %s", filename); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 807 | sent = send_pubkey_test(authctxt, key, |
| 808 | identity_sign_cb, idx); |
| 809 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 810 | idx++; |
| 811 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 812 | return sent; |
| 813 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 814 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 815 | /* |
| 816 | * Send userauth request message specifying keyboard-interactive method. |
| 817 | */ |
| 818 | int |
| 819 | userauth_kbdint(Authctxt *authctxt) |
| 820 | { |
| 821 | static int attempt = 0; |
| 822 | |
| 823 | if (attempt++ >= options.number_of_password_prompts) |
| 824 | return 0; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 825 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
| 826 | if (attempt > 1 && !authctxt->info_req_seen) { |
| 827 | debug3("userauth_kbdint: disable: no info_req_seen"); |
| 828 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); |
| 829 | return 0; |
| 830 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 831 | |
| 832 | debug2("userauth_kbdint"); |
| 833 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 834 | packet_put_cstring(authctxt->server_user); |
| 835 | packet_put_cstring(authctxt->service); |
| 836 | packet_put_cstring(authctxt->method->name); |
| 837 | packet_put_cstring(""); /* lang */ |
| 838 | packet_put_cstring(options.kbd_interactive_devices ? |
| 839 | options.kbd_interactive_devices : ""); |
| 840 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 841 | |
| 842 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); |
| 843 | return 1; |
| 844 | } |
| 845 | |
| 846 | /* |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 847 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 848 | */ |
| 849 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 850 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 851 | { |
| 852 | Authctxt *authctxt = ctxt; |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 853 | char *name, *inst, *lang, *prompt, *response; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 854 | u_int num_prompts, i; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 855 | int echo = 0; |
| 856 | |
| 857 | debug2("input_userauth_info_req"); |
| 858 | |
| 859 | if (authctxt == NULL) |
| 860 | fatal("input_userauth_info_req: no authentication context"); |
| 861 | |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 862 | authctxt->info_req_seen = 1; |
| 863 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 864 | name = packet_get_string(NULL); |
| 865 | inst = packet_get_string(NULL); |
| 866 | lang = packet_get_string(NULL); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 867 | if (strlen(name) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 868 | logit("%s", name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 869 | if (strlen(inst) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 870 | logit("%s", inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 871 | xfree(name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 872 | xfree(inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 873 | xfree(lang); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 874 | |
| 875 | num_prompts = packet_get_int(); |
| 876 | /* |
| 877 | * Begin to build info response packet based on prompts requested. |
| 878 | * We commit to providing the correct number of responses, so if |
| 879 | * further on we run into a problem that prevents this, we have to |
| 880 | * be sure and clean this up and send a correct error response. |
| 881 | */ |
| 882 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); |
| 883 | packet_put_int(num_prompts); |
| 884 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 885 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 886 | for (i = 0; i < num_prompts; i++) { |
| 887 | prompt = packet_get_string(NULL); |
| 888 | echo = packet_get_char(); |
| 889 | |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 890 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 891 | |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 892 | packet_put_cstring(response); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 893 | memset(response, 0, strlen(response)); |
| 894 | xfree(response); |
| 895 | xfree(prompt); |
| 896 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 897 | packet_check_eom(); /* done with parsing incoming message. */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 898 | |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 899 | packet_add_padding(64); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 900 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 901 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 902 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 903 | static int |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 904 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 905 | u_char *data, u_int datalen) |
| 906 | { |
| 907 | Buffer b; |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 908 | struct stat st; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 909 | pid_t pid; |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 910 | int to[2], from[2], status, version = 2; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 911 | |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 912 | debug2("ssh_keysign called"); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 913 | |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 914 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
| 915 | error("ssh_keysign: no installed: %s", strerror(errno)); |
| 916 | return -1; |
| 917 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 918 | if (fflush(stdout) != 0) |
| 919 | error("ssh_keysign: fflush: %s", strerror(errno)); |
| 920 | if (pipe(to) < 0) { |
| 921 | error("ssh_keysign: pipe: %s", strerror(errno)); |
| 922 | return -1; |
| 923 | } |
| 924 | if (pipe(from) < 0) { |
| 925 | error("ssh_keysign: pipe: %s", strerror(errno)); |
| 926 | return -1; |
| 927 | } |
| 928 | if ((pid = fork()) < 0) { |
| 929 | error("ssh_keysign: fork: %s", strerror(errno)); |
| 930 | return -1; |
| 931 | } |
| 932 | if (pid == 0) { |
| 933 | seteuid(getuid()); |
| 934 | setuid(getuid()); |
| 935 | close(from[0]); |
| 936 | if (dup2(from[1], STDOUT_FILENO) < 0) |
| 937 | fatal("ssh_keysign: dup2: %s", strerror(errno)); |
| 938 | close(to[1]); |
| 939 | if (dup2(to[0], STDIN_FILENO) < 0) |
| 940 | fatal("ssh_keysign: dup2: %s", strerror(errno)); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 941 | close(from[1]); |
| 942 | close(to[0]); |
Ben Lindstrom | 4887da2 | 2002-06-06 20:05:57 +0000 | [diff] [blame] | 943 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 944 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
| 945 | strerror(errno)); |
| 946 | } |
| 947 | close(from[1]); |
| 948 | close(to[0]); |
| 949 | |
| 950 | buffer_init(&b); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 951 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 952 | buffer_put_string(&b, data, datalen); |
Damien Miller | 901119b | 2002-10-04 11:10:04 +1000 | [diff] [blame] | 953 | ssh_msg_send(to[1], version, &b); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 954 | |
Damien Miller | 901119b | 2002-10-04 11:10:04 +1000 | [diff] [blame] | 955 | if (ssh_msg_recv(from[0], &b) < 0) { |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 956 | error("ssh_keysign: no reply"); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 957 | buffer_clear(&b); |
| 958 | return -1; |
| 959 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 960 | close(from[0]); |
| 961 | close(to[1]); |
| 962 | |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 963 | while (waitpid(pid, &status, 0) < 0) |
| 964 | if (errno != EINTR) |
| 965 | break; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 966 | |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 967 | if (buffer_get_char(&b) != version) { |
| 968 | error("ssh_keysign: bad version"); |
| 969 | buffer_clear(&b); |
| 970 | return -1; |
| 971 | } |
| 972 | *sigp = buffer_get_string(&b, lenp); |
| 973 | buffer_clear(&b); |
| 974 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 975 | return 0; |
| 976 | } |
| 977 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 978 | int |
| 979 | userauth_hostbased(Authctxt *authctxt) |
| 980 | { |
| 981 | Key *private = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 982 | Sensitive *sensitive = authctxt->sensitive; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 983 | Buffer b; |
| 984 | u_char *signature, *blob; |
| 985 | char *chost, *pkalg, *p; |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 986 | const char *service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 987 | u_int blen, slen; |
Ben Lindstrom | 2bffd6f | 2001-04-19 20:35:40 +0000 | [diff] [blame] | 988 | int ok, i, len, found = 0; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 989 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 990 | /* check for a useful key */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 991 | for (i = 0; i < sensitive->nkeys; i++) { |
| 992 | private = sensitive->keys[i]; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 993 | if (private && private->type != KEY_RSA1) { |
| 994 | found = 1; |
| 995 | /* we take and free the key */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 996 | sensitive->keys[i] = NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 997 | break; |
| 998 | } |
| 999 | } |
| 1000 | if (!found) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1001 | debug("No more client hostkeys for hostbased authentication."); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1002 | return 0; |
| 1003 | } |
| 1004 | if (key_to_blob(private, &blob, &blen) == 0) { |
| 1005 | key_free(private); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1006 | return 0; |
| 1007 | } |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1008 | /* figure out a name for the client host */ |
| 1009 | p = get_local_name(packet_get_connection_in()); |
| 1010 | if (p == NULL) { |
| 1011 | error("userauth_hostbased: cannot get local ipaddr/name"); |
| 1012 | key_free(private); |
| 1013 | return 0; |
| 1014 | } |
| 1015 | len = strlen(p) + 2; |
| 1016 | chost = xmalloc(len); |
| 1017 | strlcpy(chost, p, len); |
| 1018 | strlcat(chost, ".", len); |
| 1019 | debug2("userauth_hostbased: chost %s", chost); |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1020 | xfree(p); |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1021 | |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1022 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
| 1023 | authctxt->service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1024 | pkalg = xstrdup(key_ssh_name(private)); |
| 1025 | buffer_init(&b); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1026 | /* construct data */ |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1027 | buffer_put_string(&b, session_id2, session_id2_len); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1028 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
| 1029 | buffer_put_cstring(&b, authctxt->server_user); |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1030 | buffer_put_cstring(&b, service); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1031 | buffer_put_cstring(&b, authctxt->method->name); |
| 1032 | buffer_put_cstring(&b, pkalg); |
| 1033 | buffer_put_string(&b, blob, blen); |
| 1034 | buffer_put_cstring(&b, chost); |
| 1035 | buffer_put_cstring(&b, authctxt->local_user); |
| 1036 | #ifdef DEBUG_PK |
| 1037 | buffer_dump(&b); |
| 1038 | #endif |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1039 | if (sensitive->external_keysign) |
| 1040 | ok = ssh_keysign(private, &signature, &slen, |
| 1041 | buffer_ptr(&b), buffer_len(&b)); |
| 1042 | else |
| 1043 | ok = key_sign(private, &signature, &slen, |
| 1044 | buffer_ptr(&b), buffer_len(&b)); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1045 | key_free(private); |
| 1046 | buffer_free(&b); |
| 1047 | if (ok != 0) { |
| 1048 | error("key_sign failed"); |
| 1049 | xfree(chost); |
| 1050 | xfree(pkalg); |
| 1051 | return 0; |
| 1052 | } |
| 1053 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 1054 | packet_put_cstring(authctxt->server_user); |
| 1055 | packet_put_cstring(authctxt->service); |
| 1056 | packet_put_cstring(authctxt->method->name); |
| 1057 | packet_put_cstring(pkalg); |
| 1058 | packet_put_string(blob, blen); |
| 1059 | packet_put_cstring(chost); |
| 1060 | packet_put_cstring(authctxt->local_user); |
| 1061 | packet_put_string(signature, slen); |
| 1062 | memset(signature, 's', slen); |
| 1063 | xfree(signature); |
| 1064 | xfree(chost); |
| 1065 | xfree(pkalg); |
| 1066 | |
| 1067 | packet_send(); |
| 1068 | return 1; |
| 1069 | } |
| 1070 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1071 | /* find auth method */ |
| 1072 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1073 | /* |
| 1074 | * given auth method name, if configurable options permit this method fill |
| 1075 | * in auth_ident field and return true, otherwise return false. |
| 1076 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1077 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1078 | authmethod_is_enabled(Authmethod *method) |
| 1079 | { |
| 1080 | if (method == NULL) |
| 1081 | return 0; |
| 1082 | /* return false if options indicate this method is disabled */ |
| 1083 | if (method->enabled == NULL || *method->enabled == 0) |
| 1084 | return 0; |
| 1085 | /* return false if batch mode is enabled but method needs interactive mode */ |
| 1086 | if (method->batch_flag != NULL && *method->batch_flag != 0) |
| 1087 | return 0; |
| 1088 | return 1; |
| 1089 | } |
| 1090 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1091 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1092 | authmethod_lookup(const char *name) |
| 1093 | { |
| 1094 | Authmethod *method = NULL; |
| 1095 | if (name != NULL) |
| 1096 | for (method = authmethods; method->name != NULL; method++) |
| 1097 | if (strcmp(name, method->name) == 0) |
| 1098 | return method; |
| 1099 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); |
| 1100 | return NULL; |
| 1101 | } |
| 1102 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1103 | /* XXX internal state */ |
| 1104 | static Authmethod *current = NULL; |
| 1105 | static char *supported = NULL; |
| 1106 | static char *preferred = NULL; |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 1107 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1108 | /* |
| 1109 | * Given the authentication method list sent by the server, return the |
| 1110 | * 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] | 1111 | * use a built-in default list. |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1112 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1113 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1114 | authmethod_get(char *authlist) |
| 1115 | { |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1116 | char *name = NULL; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 1117 | u_int next; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1118 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1119 | /* Use a suitable default if we're passed a nil list. */ |
| 1120 | if (authlist == NULL || strlen(authlist) == 0) |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1121 | authlist = options.preferred_authentications; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1122 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1123 | if (supported == NULL || strcmp(authlist, supported) != 0) { |
| 1124 | debug3("start over, passed a different list %s", authlist); |
| 1125 | if (supported != NULL) |
| 1126 | xfree(supported); |
| 1127 | supported = xstrdup(authlist); |
| 1128 | preferred = options.preferred_authentications; |
| 1129 | debug3("preferred %s", preferred); |
| 1130 | current = NULL; |
| 1131 | } else if (current != NULL && authmethod_is_enabled(current)) |
| 1132 | return current; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1133 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1134 | for (;;) { |
| 1135 | if ((name = match_list(preferred, supported, &next)) == NULL) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1136 | debug("No more authentication methods to try."); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1137 | current = NULL; |
| 1138 | return NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1139 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1140 | preferred += next; |
| 1141 | debug3("authmethod_lookup %s", name); |
| 1142 | debug3("remaining preferred: %s", preferred); |
| 1143 | if ((current = authmethod_lookup(name)) != NULL && |
| 1144 | authmethod_is_enabled(current)) { |
| 1145 | debug3("authmethod_is_enabled %s", name); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1146 | debug("Next authentication method: %s", name); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1147 | return current; |
| 1148 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1149 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1150 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1151 | |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 1152 | static char * |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1153 | authmethods_get(void) |
| 1154 | { |
| 1155 | Authmethod *method = NULL; |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1156 | Buffer b; |
| 1157 | char *list; |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1158 | |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1159 | buffer_init(&b); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1160 | for (method = authmethods; method->name != NULL; method++) { |
| 1161 | if (authmethod_is_enabled(method)) { |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1162 | if (buffer_len(&b) > 0) |
| 1163 | buffer_append(&b, ",", 1); |
| 1164 | buffer_append(&b, method->name, strlen(method->name)); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1165 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1166 | } |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1167 | buffer_append(&b, "\0", 1); |
| 1168 | list = xstrdup(buffer_ptr(&b)); |
| 1169 | buffer_free(&b); |
| 1170 | return list; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1171 | } |