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" |
Darren Tucker | 7964482 | 2003-10-08 17:37:58 +1000 | [diff] [blame] | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.126 2003/10/07 21:58:28 deraadt Exp $"); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 27 | |
Damien Miller | 9c61769 | 2003-05-14 14:31:11 +1000 | [diff] [blame] | 28 | #include "openbsd-compat/sys-queue.h" |
| 29 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 30 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 31 | #include "ssh2.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 32 | #include "xmalloc.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 33 | #include "buffer.h" |
| 34 | #include "packet.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 35 | #include "compat.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 36 | #include "bufaux.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 37 | #include "cipher.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 38 | #include "kex.h" |
| 39 | #include "myproposal.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 40 | #include "sshconnect.h" |
| 41 | #include "authfile.h" |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 42 | #include "dh.h" |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 43 | #include "authfd.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 44 | #include "log.h" |
| 45 | #include "readconf.h" |
| 46 | #include "readpass.h" |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 47 | #include "match.h" |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 48 | #include "dispatch.h" |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 49 | #include "canohost.h" |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 50 | #include "msg.h" |
| 51 | #include "pathnames.h" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 52 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 53 | #ifdef GSSAPI |
| 54 | #include "ssh-gss.h" |
| 55 | #endif |
| 56 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 57 | /* import */ |
| 58 | extern char *client_version_string; |
| 59 | extern char *server_version_string; |
| 60 | extern Options options; |
| 61 | |
| 62 | /* |
| 63 | * SSH2 key exchange |
| 64 | */ |
| 65 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 66 | u_char *session_id2 = NULL; |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 67 | u_int session_id2_len = 0; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 68 | |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 69 | char *xxx_host; |
| 70 | struct sockaddr *xxx_hostaddr; |
| 71 | |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 72 | Kex *xxx_kex = NULL; |
| 73 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 74 | static int |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 75 | verify_host_key_callback(Key *hostkey) |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 76 | { |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 77 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
Damien Miller | 59d9fb9 | 2001-10-10 15:03:11 +1000 | [diff] [blame] | 78 | fatal("Host key verification failed."); |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 79 | return 0; |
| 80 | } |
| 81 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 82 | void |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 83 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
| 84 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 85 | Kex *kex; |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 86 | |
| 87 | xxx_host = host; |
| 88 | xxx_hostaddr = hostaddr; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 89 | |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 90 | if (options.ciphers == (char *)-1) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 91 | logit("No valid ciphers for protocol version 2 given, using defaults."); |
Damien Miller | e39cacc | 2000-11-29 12:18:44 +1100 | [diff] [blame] | 92 | options.ciphers = NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 93 | } |
| 94 | if (options.ciphers != NULL) { |
| 95 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
| 96 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; |
| 97 | } |
Damien Miller | a0ff466 | 2001-03-30 10:49:35 +1000 | [diff] [blame] | 98 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
| 99 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); |
| 100 | myproposal[PROPOSAL_ENC_ALGS_STOC] = |
| 101 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 102 | if (options.compression) { |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 103 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
Ben Lindstrom | 343010a | 2002-07-04 00:16:25 +0000 | [diff] [blame] | 104 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib,none"; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 105 | } else { |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 106 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
Ben Lindstrom | 343010a | 2002-07-04 00:16:25 +0000 | [diff] [blame] | 107 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib"; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 108 | } |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 109 | if (options.macs != NULL) { |
| 110 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = |
| 111 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; |
| 112 | } |
Ben Lindstrom | 982dbbc | 2001-04-17 18:11:36 +0000 | [diff] [blame] | 113 | if (options.hostkeyalgorithms != NULL) |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 114 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
Ben Lindstrom | 982dbbc | 2001-04-17 18:11:36 +0000 | [diff] [blame] | 115 | options.hostkeyalgorithms; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 116 | |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 117 | if (options.rekey_limit) |
| 118 | packet_set_rekey_limit(options.rekey_limit); |
| 119 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 120 | /* start key exchange */ |
Ben Lindstrom | 238abf6 | 2001-04-04 17:52:53 +0000 | [diff] [blame] | 121 | kex = kex_setup(myproposal); |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 122 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
| 123 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 124 | kex->client_version_string=client_version_string; |
| 125 | kex->server_version_string=server_version_string; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 126 | kex->verify_host_key=&verify_host_key_callback; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 127 | |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 128 | xxx_kex = kex; |
| 129 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 130 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 131 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 132 | session_id2 = kex->session_id; |
| 133 | session_id2_len = kex->session_id_len; |
| 134 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 135 | #ifdef DEBUG_KEXDH |
| 136 | /* send 1st encrypted/maced/compressed message */ |
| 137 | packet_start(SSH2_MSG_IGNORE); |
| 138 | packet_put_cstring("markus"); |
| 139 | packet_send(); |
| 140 | packet_write_wait(); |
| 141 | #endif |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 142 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 143 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 144 | /* |
| 145 | * Authenticate user |
| 146 | */ |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 147 | |
| 148 | typedef struct Authctxt Authctxt; |
| 149 | typedef struct Authmethod Authmethod; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 150 | typedef struct identity Identity; |
| 151 | typedef struct idlist Idlist; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 152 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 153 | struct identity { |
| 154 | TAILQ_ENTRY(identity) next; |
| 155 | AuthenticationConnection *ac; /* set if agent supports key */ |
| 156 | Key *key; /* public/private key */ |
| 157 | char *filename; /* comment for agent-only keys */ |
| 158 | int tried; |
| 159 | int isprivate; /* key points to the private key */ |
| 160 | }; |
| 161 | TAILQ_HEAD(idlist, identity); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 162 | |
| 163 | struct Authctxt { |
| 164 | const char *server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 165 | const char *local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 166 | const char *host; |
| 167 | const char *service; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 168 | Authmethod *method; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 169 | int success; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 170 | char *authlist; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 171 | /* pubkey */ |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 172 | Idlist keys; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 173 | AuthenticationConnection *agent; |
| 174 | /* hostbased */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 175 | Sensitive *sensitive; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 176 | /* kbd-interactive */ |
| 177 | int info_req_seen; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 178 | /* generic */ |
| 179 | void *methoddata; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 180 | }; |
| 181 | struct Authmethod { |
| 182 | char *name; /* string to compare against server's list */ |
| 183 | int (*userauth)(Authctxt *authctxt); |
| 184 | int *enabled; /* flag in option struct that enables method */ |
| 185 | int *batch_flag; /* flag in option struct that disables method */ |
| 186 | }; |
| 187 | |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 188 | void input_userauth_success(int, u_int32_t, void *); |
| 189 | void input_userauth_failure(int, u_int32_t, void *); |
| 190 | void input_userauth_banner(int, u_int32_t, void *); |
| 191 | void input_userauth_error(int, u_int32_t, void *); |
| 192 | void input_userauth_info_req(int, u_int32_t, void *); |
| 193 | void input_userauth_pk_ok(int, u_int32_t, void *); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 194 | void input_userauth_passwd_changereq(int, u_int32_t, void *); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 195 | |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 196 | int userauth_none(Authctxt *); |
| 197 | int userauth_pubkey(Authctxt *); |
| 198 | int userauth_passwd(Authctxt *); |
| 199 | int userauth_kbdint(Authctxt *); |
| 200 | int userauth_hostbased(Authctxt *); |
Damien Miller | 3ab496b | 2003-05-14 13:47:37 +1000 | [diff] [blame] | 201 | int userauth_kerberos(Authctxt *); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 202 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 203 | #ifdef GSSAPI |
| 204 | int userauth_gssapi(Authctxt *authctxt); |
| 205 | void input_gssapi_response(int type, u_int32_t, void *); |
| 206 | void input_gssapi_token(int type, u_int32_t, void *); |
| 207 | void input_gssapi_hash(int type, u_int32_t, void *); |
| 208 | void input_gssapi_error(int, u_int32_t, void *); |
| 209 | void input_gssapi_errtok(int, u_int32_t, void *); |
| 210 | #endif |
| 211 | |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 212 | void userauth(Authctxt *, char *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 213 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 214 | static int sign_and_send_pubkey(Authctxt *, Identity *); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 215 | static void pubkey_prepare(Authctxt *); |
| 216 | static void pubkey_cleanup(Authctxt *); |
| 217 | static Key *load_identity_file(char *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 218 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 219 | static Authmethod *authmethod_get(char *authlist); |
| 220 | static Authmethod *authmethod_lookup(const char *name); |
| 221 | static char *authmethods_get(void); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 222 | |
| 223 | Authmethod authmethods[] = { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 224 | #ifdef GSSAPI |
| 225 | {"gssapi", |
| 226 | userauth_gssapi, |
| 227 | &options.gss_authentication, |
| 228 | NULL}, |
| 229 | #endif |
Ben Lindstrom | 1bfe291 | 2001-06-05 19:37:25 +0000 | [diff] [blame] | 230 | {"hostbased", |
| 231 | userauth_hostbased, |
| 232 | &options.hostbased_authentication, |
| 233 | NULL}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 234 | {"publickey", |
| 235 | userauth_pubkey, |
| 236 | &options.pubkey_authentication, |
| 237 | NULL}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 238 | {"keyboard-interactive", |
| 239 | userauth_kbdint, |
| 240 | &options.kbd_interactive_authentication, |
| 241 | &options.batch_mode}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 242 | {"password", |
| 243 | userauth_passwd, |
| 244 | &options.password_authentication, |
| 245 | &options.batch_mode}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 246 | {"none", |
| 247 | userauth_none, |
| 248 | NULL, |
| 249 | NULL}, |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 250 | {NULL, NULL, NULL, NULL} |
| 251 | }; |
| 252 | |
| 253 | void |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 254 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 255 | Sensitive *sensitive) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 256 | { |
| 257 | Authctxt authctxt; |
| 258 | int type; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 259 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 260 | if (options.challenge_response_authentication) |
Ben Lindstrom | 95fb2dd | 2001-01-23 03:12:10 +0000 | [diff] [blame] | 261 | options.kbd_interactive_authentication = 1; |
| 262 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 263 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
| 264 | packet_put_cstring("ssh-userauth"); |
| 265 | packet_send(); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 266 | debug("SSH2_MSG_SERVICE_REQUEST sent"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 267 | packet_write_wait(); |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 268 | type = packet_read(); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 269 | if (type != SSH2_MSG_SERVICE_ACCEPT) |
| 270 | fatal("Server denied authentication request: %d", type); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 271 | if (packet_remaining() > 0) { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 272 | char *reply = packet_get_string(NULL); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 273 | debug2("service_accept: %s", reply); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 274 | xfree(reply); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 275 | } else { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 276 | debug2("buggy server: service_accept w/o service"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 277 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 278 | packet_check_eom(); |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 279 | debug("SSH2_MSG_SERVICE_ACCEPT received"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 280 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 281 | if (options.preferred_authentications == NULL) |
| 282 | options.preferred_authentications = authmethods_get(); |
| 283 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 284 | /* setup authentication context */ |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 285 | memset(&authctxt, 0, sizeof(authctxt)); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 286 | pubkey_prepare(&authctxt); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 287 | authctxt.server_user = server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 288 | authctxt.local_user = local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 289 | authctxt.host = host; |
| 290 | authctxt.service = "ssh-connection"; /* service name */ |
| 291 | authctxt.success = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 292 | authctxt.method = authmethod_lookup("none"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 293 | authctxt.authlist = NULL; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 294 | authctxt.methoddata = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 295 | authctxt.sensitive = sensitive; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 296 | authctxt.info_req_seen = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 297 | if (authctxt.method == NULL) |
| 298 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 299 | |
| 300 | /* initial userauth request */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 301 | userauth_none(&authctxt); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 302 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 303 | dispatch_init(&input_userauth_error); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 304 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
| 305 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 306 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 307 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
| 308 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 309 | pubkey_cleanup(&authctxt); |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 310 | dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL); |
| 311 | |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 312 | debug("Authentication succeeded (%s).", authctxt.method->name); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 313 | } |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 314 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 315 | void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 316 | userauth(Authctxt *authctxt, char *authlist) |
| 317 | { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 318 | if (authctxt->methoddata) { |
| 319 | xfree(authctxt->methoddata); |
| 320 | authctxt->methoddata = NULL; |
| 321 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 322 | if (authlist == NULL) { |
| 323 | authlist = authctxt->authlist; |
| 324 | } else { |
| 325 | if (authctxt->authlist) |
| 326 | xfree(authctxt->authlist); |
| 327 | authctxt->authlist = authlist; |
| 328 | } |
| 329 | for (;;) { |
| 330 | Authmethod *method = authmethod_get(authlist); |
| 331 | if (method == NULL) |
| 332 | fatal("Permission denied (%s).", authlist); |
| 333 | authctxt->method = method; |
Damien Miller | f842fcb | 2003-05-15 12:01:28 +1000 | [diff] [blame] | 334 | |
| 335 | /* reset the per method handler */ |
| 336 | dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN, |
| 337 | SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL); |
| 338 | |
| 339 | /* and try new method */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 340 | if (method->userauth(authctxt) != 0) { |
| 341 | debug2("we sent a %s packet, wait for reply", method->name); |
| 342 | break; |
| 343 | } else { |
| 344 | debug2("we did not send a packet, disable method"); |
| 345 | method->enabled = NULL; |
| 346 | } |
| 347 | } |
| 348 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 349 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 350 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 351 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 352 | { |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 353 | fatal("input_userauth_error: bad message during authentication: " |
| 354 | "type %d", type); |
| 355 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 356 | |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 357 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 358 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 359 | { |
| 360 | char *msg, *lang; |
Darren Tucker | 7964482 | 2003-10-08 17:37:58 +1000 | [diff] [blame] | 361 | |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 362 | debug3("input_userauth_banner"); |
| 363 | msg = packet_get_string(NULL); |
| 364 | lang = packet_get_string(NULL); |
Darren Tucker | 046dff2 | 2003-10-08 17:32:02 +1000 | [diff] [blame] | 365 | if (options.log_level > SYSLOG_LEVEL_QUIET) |
| 366 | fprintf(stderr, "%s", msg); |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 367 | xfree(msg); |
| 368 | xfree(lang); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 369 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 370 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 371 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 372 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 373 | { |
| 374 | Authctxt *authctxt = ctxt; |
| 375 | if (authctxt == NULL) |
| 376 | fatal("input_userauth_success: no authentication context"); |
Darren Tucker | 7964482 | 2003-10-08 17:37:58 +1000 | [diff] [blame] | 377 | if (authctxt->authlist) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 378 | xfree(authctxt->authlist); |
Darren Tucker | 7964482 | 2003-10-08 17:37:58 +1000 | [diff] [blame] | 379 | authctxt->authlist = NULL; |
| 380 | } |
| 381 | if (authctxt->methoddata) { |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 382 | xfree(authctxt->methoddata); |
Darren Tucker | 7964482 | 2003-10-08 17:37:58 +1000 | [diff] [blame] | 383 | authctxt->methoddata = NULL; |
| 384 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 385 | authctxt->success = 1; /* break out */ |
| 386 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 387 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 388 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 389 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 390 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 391 | Authctxt *authctxt = ctxt; |
| 392 | char *authlist = NULL; |
| 393 | int partial; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 394 | |
| 395 | if (authctxt == NULL) |
| 396 | fatal("input_userauth_failure: no authentication context"); |
| 397 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 398 | authlist = packet_get_string(NULL); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 399 | partial = packet_get_char(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 400 | packet_check_eom(); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 401 | |
| 402 | if (partial != 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 403 | logit("Authenticated with partial success."); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 404 | debug("Authentications that can continue: %s", authlist); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 405 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 406 | userauth(authctxt, authlist); |
| 407 | } |
| 408 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 409 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 410 | { |
| 411 | Authctxt *authctxt = ctxt; |
| 412 | Key *key = NULL; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 413 | Identity *id = NULL; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 414 | Buffer b; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 415 | int pktype, sent = 0; |
| 416 | u_int alen, blen; |
| 417 | char *pkalg, *fp; |
| 418 | u_char *pkblob; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 419 | |
| 420 | if (authctxt == NULL) |
| 421 | fatal("input_userauth_pk_ok: no authentication context"); |
| 422 | if (datafellows & SSH_BUG_PKOK) { |
| 423 | /* this is similar to SSH_BUG_PKAUTH */ |
| 424 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); |
| 425 | pkblob = packet_get_string(&blen); |
| 426 | buffer_init(&b); |
| 427 | buffer_append(&b, pkblob, blen); |
| 428 | pkalg = buffer_get_string(&b, &alen); |
| 429 | buffer_free(&b); |
| 430 | } else { |
| 431 | pkalg = packet_get_string(&alen); |
| 432 | pkblob = packet_get_string(&blen); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 433 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 434 | packet_check_eom(); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 435 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 436 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 437 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 438 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
| 439 | debug("unknown pkalg %s", pkalg); |
| 440 | goto done; |
| 441 | } |
| 442 | if ((key = key_from_blob(pkblob, blen)) == NULL) { |
| 443 | debug("no key from blob. pkalg %s", pkalg); |
| 444 | goto done; |
| 445 | } |
| 446 | if (key->type != pktype) { |
| 447 | error("input_userauth_pk_ok: type mismatch " |
| 448 | "for decoded key (received %d, expected %d)", |
| 449 | key->type, pktype); |
| 450 | goto done; |
| 451 | } |
| 452 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); |
| 453 | debug2("input_userauth_pk_ok: fp %s", fp); |
| 454 | xfree(fp); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 455 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 456 | TAILQ_FOREACH(id, &authctxt->keys, next) { |
| 457 | if (key_equal(key, id->key)) { |
| 458 | sent = sign_and_send_pubkey(authctxt, id); |
| 459 | break; |
| 460 | } |
| 461 | } |
| 462 | done: |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 463 | if (key != NULL) |
| 464 | key_free(key); |
| 465 | xfree(pkalg); |
| 466 | xfree(pkblob); |
| 467 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 468 | /* try another method if we did not send a packet */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 469 | if (sent == 0) |
| 470 | userauth(authctxt, NULL); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 471 | } |
| 472 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 473 | #ifdef GSSAPI |
| 474 | int |
| 475 | userauth_gssapi(Authctxt *authctxt) |
| 476 | { |
| 477 | Gssctxt *gssctxt = NULL; |
| 478 | static gss_OID_set supported = NULL; |
| 479 | static int mech = 0; |
| 480 | OM_uint32 min; |
| 481 | int ok = 0; |
| 482 | |
| 483 | /* Try one GSSAPI method at a time, rather than sending them all at |
| 484 | * once. */ |
| 485 | |
| 486 | if (supported == NULL) |
| 487 | gss_indicate_mechs(&min, &supported); |
| 488 | |
| 489 | /* Check to see if the mechanism is usable before we offer it */ |
| 490 | while (mech<supported->count && !ok) { |
| 491 | if (gssctxt) |
| 492 | ssh_gssapi_delete_ctx(&gssctxt); |
| 493 | ssh_gssapi_build_ctx(&gssctxt); |
| 494 | ssh_gssapi_set_oid(gssctxt, &supported->elements[mech]); |
| 495 | |
| 496 | /* My DER encoding requires length<128 */ |
| 497 | if (supported->elements[mech].length < 128 && |
| 498 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, |
| 499 | authctxt->host))) { |
| 500 | ok = 1; /* Mechanism works */ |
| 501 | } else { |
| 502 | mech++; |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | if (!ok) return 0; |
| 507 | |
| 508 | authctxt->methoddata=(void *)gssctxt; |
| 509 | |
| 510 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 511 | packet_put_cstring(authctxt->server_user); |
| 512 | packet_put_cstring(authctxt->service); |
| 513 | packet_put_cstring(authctxt->method->name); |
| 514 | |
| 515 | packet_put_int(1); |
| 516 | |
| 517 | /* Some servers encode the OID incorrectly (as we used to) */ |
| 518 | if (datafellows & SSH_BUG_GSSAPI_BER) { |
| 519 | packet_put_string(supported->elements[mech].elements, |
| 520 | supported->elements[mech].length); |
| 521 | } else { |
| 522 | packet_put_int((supported->elements[mech].length)+2); |
| 523 | packet_put_char(SSH_GSS_OIDTYPE); |
| 524 | packet_put_char(supported->elements[mech].length); |
| 525 | packet_put_raw(supported->elements[mech].elements, |
| 526 | supported->elements[mech].length); |
| 527 | } |
| 528 | |
| 529 | packet_send(); |
| 530 | |
| 531 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); |
| 532 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); |
| 533 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); |
| 534 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); |
| 535 | |
| 536 | mech++; /* Move along to next candidate */ |
| 537 | |
| 538 | return 1; |
| 539 | } |
| 540 | |
| 541 | void |
| 542 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) |
| 543 | { |
| 544 | Authctxt *authctxt = ctxt; |
| 545 | Gssctxt *gssctxt; |
| 546 | OM_uint32 status, ms; |
| 547 | int oidlen; |
| 548 | char *oidv; |
| 549 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 550 | |
| 551 | if (authctxt == NULL) |
| 552 | fatal("input_gssapi_response: no authentication context"); |
| 553 | gssctxt = authctxt->methoddata; |
| 554 | |
| 555 | /* Setup our OID */ |
| 556 | oidv = packet_get_string(&oidlen); |
| 557 | |
| 558 | if (datafellows & SSH_BUG_GSSAPI_BER) { |
| 559 | if (!ssh_gssapi_check_oid(gssctxt, oidv, oidlen)) |
| 560 | fatal("Server returned different OID than expected"); |
| 561 | } else { |
| 562 | if(oidv[0] != SSH_GSS_OIDTYPE || oidv[1] != oidlen-2) { |
| 563 | debug("Badly encoded mechanism OID received"); |
| 564 | userauth(authctxt, NULL); |
| 565 | xfree(oidv); |
| 566 | return; |
| 567 | } |
| 568 | if (!ssh_gssapi_check_oid(gssctxt, oidv+2, oidlen-2)) |
| 569 | fatal("Server returned different OID than expected"); |
| 570 | } |
| 571 | |
| 572 | packet_check_eom(); |
| 573 | |
| 574 | xfree(oidv); |
| 575 | |
| 576 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
| 577 | GSS_C_NO_BUFFER, &send_tok, NULL); |
| 578 | if (GSS_ERROR(status)) { |
| 579 | if (send_tok.length > 0) { |
| 580 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); |
| 581 | packet_put_string(send_tok.value, send_tok.length); |
| 582 | packet_send(); |
| 583 | gss_release_buffer(&ms, &send_tok); |
| 584 | } |
| 585 | /* Start again with next method on list */ |
| 586 | debug("Trying to start again"); |
| 587 | userauth(authctxt, NULL); |
| 588 | return; |
| 589 | } |
| 590 | |
| 591 | /* We must have data to send */ |
| 592 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); |
| 593 | packet_put_string(send_tok.value, send_tok.length); |
| 594 | packet_send(); |
| 595 | gss_release_buffer(&ms, &send_tok); |
| 596 | } |
| 597 | |
| 598 | void |
| 599 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) |
| 600 | { |
| 601 | Authctxt *authctxt = ctxt; |
| 602 | Gssctxt *gssctxt; |
| 603 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 604 | gss_buffer_desc recv_tok; |
| 605 | OM_uint32 status, ms; |
| 606 | u_int slen; |
| 607 | |
| 608 | if (authctxt == NULL) |
| 609 | fatal("input_gssapi_response: no authentication context"); |
| 610 | gssctxt = authctxt->methoddata; |
| 611 | |
| 612 | recv_tok.value = packet_get_string(&slen); |
| 613 | recv_tok.length = slen; /* safe typecast */ |
| 614 | |
| 615 | packet_check_eom(); |
| 616 | |
Darren Tucker | 7964482 | 2003-10-08 17:37:58 +1000 | [diff] [blame] | 617 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 618 | &recv_tok, &send_tok, NULL); |
| 619 | |
| 620 | xfree(recv_tok.value); |
| 621 | |
| 622 | if (GSS_ERROR(status)) { |
| 623 | if (send_tok.length > 0) { |
| 624 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); |
| 625 | packet_put_string(send_tok.value, send_tok.length); |
| 626 | packet_send(); |
| 627 | gss_release_buffer(&ms, &send_tok); |
| 628 | } |
| 629 | /* Start again with the next method in the list */ |
| 630 | userauth(authctxt, NULL); |
| 631 | return; |
| 632 | } |
| 633 | |
| 634 | if (send_tok.length > 0) { |
| 635 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); |
| 636 | packet_put_string(send_tok.value, send_tok.length); |
| 637 | packet_send(); |
| 638 | gss_release_buffer(&ms, &send_tok); |
| 639 | } |
| 640 | |
| 641 | if (status == GSS_S_COMPLETE) { |
| 642 | /* If that succeeded, send a exchange complete message */ |
| 643 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); |
| 644 | packet_send(); |
| 645 | } |
| 646 | } |
| 647 | |
| 648 | void |
| 649 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) |
| 650 | { |
| 651 | Authctxt *authctxt = ctxt; |
| 652 | Gssctxt *gssctxt; |
| 653 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 654 | gss_buffer_desc recv_tok; |
| 655 | OM_uint32 status, ms; |
Darren Tucker | 600ad8d | 2003-08-26 12:10:48 +1000 | [diff] [blame] | 656 | u_int len; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 657 | |
| 658 | if (authctxt == NULL) |
| 659 | fatal("input_gssapi_response: no authentication context"); |
| 660 | gssctxt = authctxt->methoddata; |
| 661 | |
Darren Tucker | 600ad8d | 2003-08-26 12:10:48 +1000 | [diff] [blame] | 662 | recv_tok.value = packet_get_string(&len); |
| 663 | recv_tok.length = len; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 664 | |
| 665 | packet_check_eom(); |
| 666 | |
| 667 | /* Stick it into GSSAPI and see what it says */ |
| 668 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
| 669 | &recv_tok, &send_tok, NULL); |
| 670 | |
| 671 | xfree(recv_tok.value); |
| 672 | gss_release_buffer(&ms, &send_tok); |
| 673 | |
| 674 | /* Server will be returning a failed packet after this one */ |
| 675 | } |
| 676 | |
| 677 | void |
| 678 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) |
| 679 | { |
| 680 | OM_uint32 maj, min; |
| 681 | char *msg; |
| 682 | char *lang; |
| 683 | |
| 684 | maj=packet_get_int(); |
| 685 | min=packet_get_int(); |
| 686 | msg=packet_get_string(NULL); |
| 687 | lang=packet_get_string(NULL); |
| 688 | |
| 689 | packet_check_eom(); |
| 690 | |
| 691 | debug("Server GSSAPI Error:\n%s\n", msg); |
| 692 | xfree(msg); |
| 693 | xfree(lang); |
| 694 | } |
| 695 | #endif /* GSSAPI */ |
| 696 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 697 | int |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 698 | userauth_none(Authctxt *authctxt) |
| 699 | { |
| 700 | /* initial userauth request */ |
| 701 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 702 | packet_put_cstring(authctxt->server_user); |
| 703 | packet_put_cstring(authctxt->service); |
| 704 | packet_put_cstring(authctxt->method->name); |
| 705 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 706 | return 1; |
| 707 | } |
| 708 | |
| 709 | int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 710 | userauth_passwd(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 711 | { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 712 | static int attempt = 0; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 713 | char prompt[150]; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 714 | char *password; |
| 715 | |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 716 | if (attempt++ >= options.number_of_password_prompts) |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 717 | return 0; |
| 718 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 719 | if (attempt != 1) |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 720 | error("Permission denied, please try again."); |
| 721 | |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 722 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 723 | authctxt->server_user, authctxt->host); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 724 | password = read_passphrase(prompt, 0); |
| 725 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 726 | packet_put_cstring(authctxt->server_user); |
| 727 | packet_put_cstring(authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 728 | packet_put_cstring(authctxt->method->name); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 729 | packet_put_char(0); |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 730 | packet_put_cstring(password); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 731 | memset(password, 0, strlen(password)); |
| 732 | xfree(password); |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 733 | packet_add_padding(64); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 734 | packet_send(); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 735 | |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 736 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 737 | &input_userauth_passwd_changereq); |
| 738 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 739 | return 1; |
| 740 | } |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 741 | /* |
| 742 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST |
| 743 | */ |
| 744 | void |
Tim Rice | c854962 | 2002-03-31 12:49:38 -0800 | [diff] [blame] | 745 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 746 | { |
| 747 | Authctxt *authctxt = ctxt; |
| 748 | char *info, *lang, *password = NULL, *retype = NULL; |
| 749 | char prompt[150]; |
| 750 | |
| 751 | debug2("input_userauth_passwd_changereq"); |
| 752 | |
| 753 | if (authctxt == NULL) |
| 754 | fatal("input_userauth_passwd_changereq: " |
| 755 | "no authentication context"); |
| 756 | |
| 757 | info = packet_get_string(NULL); |
| 758 | lang = packet_get_string(NULL); |
| 759 | if (strlen(info) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 760 | logit("%s", info); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 761 | xfree(info); |
| 762 | xfree(lang); |
| 763 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 764 | packet_put_cstring(authctxt->server_user); |
| 765 | packet_put_cstring(authctxt->service); |
| 766 | packet_put_cstring(authctxt->method->name); |
| 767 | packet_put_char(1); /* additional info */ |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 768 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 769 | "Enter %.30s@%.128s's old password: ", |
| 770 | authctxt->server_user, authctxt->host); |
| 771 | password = read_passphrase(prompt, 0); |
| 772 | packet_put_cstring(password); |
| 773 | memset(password, 0, strlen(password)); |
| 774 | xfree(password); |
| 775 | password = NULL; |
| 776 | while (password == NULL) { |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 777 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 778 | "Enter %.30s@%.128s's new password: ", |
| 779 | authctxt->server_user, authctxt->host); |
| 780 | password = read_passphrase(prompt, RP_ALLOW_EOF); |
| 781 | if (password == NULL) { |
| 782 | /* bail out */ |
| 783 | return; |
| 784 | } |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 785 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 786 | "Retype %.30s@%.128s's new password: ", |
| 787 | authctxt->server_user, authctxt->host); |
| 788 | retype = read_passphrase(prompt, 0); |
| 789 | if (strcmp(password, retype) != 0) { |
| 790 | memset(password, 0, strlen(password)); |
| 791 | xfree(password); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 792 | logit("Mismatch; try again, EOF to quit."); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 793 | password = NULL; |
| 794 | } |
| 795 | memset(retype, 0, strlen(retype)); |
| 796 | xfree(retype); |
| 797 | } |
| 798 | packet_put_cstring(password); |
| 799 | memset(password, 0, strlen(password)); |
| 800 | xfree(password); |
| 801 | packet_add_padding(64); |
| 802 | packet_send(); |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 803 | |
| 804 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 805 | &input_userauth_passwd_changereq); |
| 806 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 807 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 808 | static int |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 809 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, |
| 810 | u_char *data, u_int datalen) |
| 811 | { |
| 812 | Key *prv; |
| 813 | int ret; |
| 814 | |
| 815 | /* the agent supports this key */ |
| 816 | if (id->ac) |
| 817 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, |
| 818 | data, datalen)); |
| 819 | /* |
| 820 | * we have already loaded the private key or |
| 821 | * the private key is stored in external hardware |
| 822 | */ |
| 823 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) |
| 824 | return (key_sign(id->key, sigp, lenp, data, datalen)); |
| 825 | /* load the private key from the file */ |
| 826 | if ((prv = load_identity_file(id->filename)) == NULL) |
| 827 | return (-1); |
| 828 | ret = key_sign(prv, sigp, lenp, data, datalen); |
| 829 | key_free(prv); |
| 830 | return (ret); |
| 831 | } |
| 832 | |
| 833 | static int |
| 834 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 835 | { |
| 836 | Buffer b; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 837 | u_char *blob, *signature; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 838 | u_int bloblen, slen; |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 839 | u_int skip = 0; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 840 | int ret = -1; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 841 | int have_sig = 1; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 842 | |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 843 | debug3("sign_and_send_pubkey"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 844 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 845 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 846 | /* we cannot handle this key */ |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 847 | debug3("sign_and_send_pubkey: cannot handle key"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 848 | return 0; |
| 849 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 850 | /* data to be signed */ |
| 851 | buffer_init(&b); |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 852 | if (datafellows & SSH_OLD_SESSIONID) { |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 853 | buffer_append(&b, session_id2, session_id2_len); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 854 | skip = session_id2_len; |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 855 | } else { |
| 856 | buffer_put_string(&b, session_id2, session_id2_len); |
| 857 | skip = buffer_len(&b); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 858 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 859 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 860 | buffer_put_cstring(&b, authctxt->server_user); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 861 | buffer_put_cstring(&b, |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 862 | datafellows & SSH_BUG_PKSERVICE ? |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 863 | "ssh-userauth" : |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 864 | authctxt->service); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 865 | if (datafellows & SSH_BUG_PKAUTH) { |
| 866 | buffer_put_char(&b, have_sig); |
| 867 | } else { |
| 868 | buffer_put_cstring(&b, authctxt->method->name); |
| 869 | buffer_put_char(&b, have_sig); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 870 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 871 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 872 | buffer_put_string(&b, blob, bloblen); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 873 | |
| 874 | /* generate signature */ |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 875 | ret = identity_sign(id, &signature, &slen, |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 876 | buffer_ptr(&b), buffer_len(&b)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 877 | if (ret == -1) { |
| 878 | xfree(blob); |
| 879 | buffer_free(&b); |
| 880 | return 0; |
| 881 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 882 | #ifdef DEBUG_PK |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 883 | buffer_dump(&b); |
| 884 | #endif |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 885 | if (datafellows & SSH_BUG_PKSERVICE) { |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 886 | buffer_clear(&b); |
| 887 | buffer_append(&b, session_id2, session_id2_len); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 888 | skip = session_id2_len; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 889 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 890 | buffer_put_cstring(&b, authctxt->server_user); |
| 891 | buffer_put_cstring(&b, authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 892 | buffer_put_cstring(&b, authctxt->method->name); |
| 893 | buffer_put_char(&b, have_sig); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 894 | if (!(datafellows & SSH_BUG_PKAUTH)) |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 895 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 896 | buffer_put_string(&b, blob, bloblen); |
| 897 | } |
| 898 | xfree(blob); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 899 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 900 | /* append signature */ |
| 901 | buffer_put_string(&b, signature, slen); |
| 902 | xfree(signature); |
| 903 | |
| 904 | /* skip session id and packet type */ |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 905 | if (buffer_len(&b) < skip + 1) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 906 | fatal("userauth_pubkey: internal error"); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 907 | buffer_consume(&b, skip + 1); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 908 | |
| 909 | /* put remaining data from buffer into packet */ |
| 910 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 911 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); |
| 912 | buffer_free(&b); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 913 | packet_send(); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 914 | |
| 915 | return 1; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 916 | } |
| 917 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 918 | static int |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 919 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 920 | { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 921 | u_char *blob; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 922 | u_int bloblen, have_sig = 0; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 923 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 924 | debug3("send_pubkey_test"); |
| 925 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 926 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 927 | /* we cannot handle this key */ |
| 928 | debug3("send_pubkey_test: cannot handle key"); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 929 | return 0; |
| 930 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 931 | /* register callback for USERAUTH_PK_OK message */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 932 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 933 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 934 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 935 | packet_put_cstring(authctxt->server_user); |
| 936 | packet_put_cstring(authctxt->service); |
| 937 | packet_put_cstring(authctxt->method->name); |
| 938 | packet_put_char(have_sig); |
| 939 | if (!(datafellows & SSH_BUG_PKAUTH)) |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 940 | packet_put_cstring(key_ssh_name(id->key)); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 941 | packet_put_string(blob, bloblen); |
| 942 | xfree(blob); |
| 943 | packet_send(); |
| 944 | return 1; |
| 945 | } |
| 946 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 947 | static Key * |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 948 | load_identity_file(char *filename) |
| 949 | { |
| 950 | Key *private; |
| 951 | char prompt[300], *passphrase; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 952 | int quit, i; |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 953 | struct stat st; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 954 | |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 955 | if (stat(filename, &st) < 0) { |
| 956 | debug3("no such identity: %s", filename); |
| 957 | return NULL; |
| 958 | } |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 959 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL); |
| 960 | if (private == NULL) { |
| 961 | if (options.batch_mode) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 962 | return NULL; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 963 | snprintf(prompt, sizeof prompt, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 964 | "Enter passphrase for key '%.100s': ", filename); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 965 | for (i = 0; i < options.number_of_password_prompts; i++) { |
| 966 | passphrase = read_passphrase(prompt, 0); |
| 967 | if (strcmp(passphrase, "") != 0) { |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 968 | private = key_load_private_type(KEY_UNSPEC, filename, |
| 969 | passphrase, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 970 | quit = 0; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 971 | } else { |
| 972 | debug2("no passphrase given, try next key"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 973 | quit = 1; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 974 | } |
| 975 | memset(passphrase, 0, strlen(passphrase)); |
| 976 | xfree(passphrase); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 977 | if (private != NULL || quit) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 978 | break; |
| 979 | debug2("bad passphrase given, try again..."); |
| 980 | } |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 981 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 982 | return private; |
| 983 | } |
| 984 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 985 | /* |
| 986 | * try keys in the following order: |
| 987 | * 1. agent keys that are found in the config file |
| 988 | * 2. other agent keys |
| 989 | * 3. keys that are only listed in the config file |
| 990 | */ |
| 991 | static void |
| 992 | pubkey_prepare(Authctxt *authctxt) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 993 | { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 994 | Identity *id; |
| 995 | Idlist agent, files, *preferred; |
| 996 | Key *key; |
| 997 | AuthenticationConnection *ac; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 998 | char *comment; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 999 | int i, found; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1000 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1001 | TAILQ_INIT(&agent); /* keys from the agent */ |
| 1002 | TAILQ_INIT(&files); /* keys from the config file */ |
| 1003 | preferred = &authctxt->keys; |
| 1004 | TAILQ_INIT(preferred); /* preferred order of keys */ |
| 1005 | |
| 1006 | /* list of keys stored in the filesystem */ |
| 1007 | for (i = 0; i < options.num_identity_files; i++) { |
| 1008 | key = options.identity_keys[i]; |
| 1009 | if (key && key->type == KEY_RSA1) |
| 1010 | continue; |
| 1011 | options.identity_keys[i] = NULL; |
| 1012 | id = xmalloc(sizeof(*id)); |
| 1013 | memset(id, 0, sizeof(*id)); |
| 1014 | id->key = key; |
| 1015 | id->filename = xstrdup(options.identity_files[i]); |
| 1016 | TAILQ_INSERT_TAIL(&files, id, next); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1017 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1018 | /* list of keys supported by the agent */ |
| 1019 | if ((ac = ssh_get_authentication_connection())) { |
| 1020 | for (key = ssh_get_first_identity(ac, &comment, 2); |
| 1021 | key != NULL; |
| 1022 | key = ssh_get_next_identity(ac, &comment, 2)) { |
| 1023 | found = 0; |
| 1024 | TAILQ_FOREACH(id, &files, next) { |
| 1025 | /* agent keys from the config file are preferred */ |
| 1026 | if (key_equal(key, id->key)) { |
| 1027 | key_free(key); |
| 1028 | xfree(comment); |
| 1029 | TAILQ_REMOVE(&files, id, next); |
| 1030 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1031 | id->ac = ac; |
| 1032 | found = 1; |
| 1033 | break; |
| 1034 | } |
| 1035 | } |
| 1036 | if (!found) { |
| 1037 | id = xmalloc(sizeof(*id)); |
| 1038 | memset(id, 0, sizeof(*id)); |
| 1039 | id->key = key; |
| 1040 | id->filename = comment; |
| 1041 | id->ac = ac; |
| 1042 | TAILQ_INSERT_TAIL(&agent, id, next); |
| 1043 | } |
| 1044 | } |
| 1045 | /* append remaining agent keys */ |
| 1046 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { |
| 1047 | TAILQ_REMOVE(&agent, id, next); |
| 1048 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1049 | } |
| 1050 | authctxt->agent = ac; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1051 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1052 | /* append remaining keys from the config file */ |
| 1053 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { |
| 1054 | TAILQ_REMOVE(&files, id, next); |
| 1055 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1056 | } |
| 1057 | TAILQ_FOREACH(id, preferred, next) { |
| 1058 | debug2("key: %s (%p)", id->filename, id->key); |
| 1059 | } |
| 1060 | } |
| 1061 | |
| 1062 | static void |
| 1063 | pubkey_cleanup(Authctxt *authctxt) |
| 1064 | { |
| 1065 | Identity *id; |
| 1066 | |
| 1067 | if (authctxt->agent != NULL) |
| 1068 | ssh_close_authentication_connection(authctxt->agent); |
| 1069 | for (id = TAILQ_FIRST(&authctxt->keys); id; |
| 1070 | id = TAILQ_FIRST(&authctxt->keys)) { |
| 1071 | TAILQ_REMOVE(&authctxt->keys, id, next); |
| 1072 | if (id->key) |
| 1073 | key_free(id->key); |
| 1074 | if (id->filename) |
| 1075 | xfree(id->filename); |
| 1076 | xfree(id); |
| 1077 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1078 | } |
| 1079 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1080 | int |
| 1081 | userauth_pubkey(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1082 | { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1083 | Identity *id; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1084 | int sent = 0; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1085 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1086 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
| 1087 | if (id->tried++) |
| 1088 | return (0); |
| 1089 | TAILQ_REMOVE(&authctxt->keys, id, next); |
| 1090 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); |
| 1091 | /* |
| 1092 | * send a test message if we have the public key. for |
| 1093 | * encrypted keys we cannot do this and have to load the |
| 1094 | * private key instead |
| 1095 | */ |
| 1096 | if (id->key && id->key->type != KEY_RSA1) { |
| 1097 | debug("Offering public key: %s", id->filename); |
| 1098 | sent = send_pubkey_test(authctxt, id); |
| 1099 | } else if (id->key == NULL) { |
| 1100 | debug("Trying private key: %s", id->filename); |
| 1101 | id->key = load_identity_file(id->filename); |
| 1102 | if (id->key != NULL) { |
| 1103 | id->isprivate = 1; |
| 1104 | sent = sign_and_send_pubkey(authctxt, id); |
| 1105 | key_free(id->key); |
| 1106 | id->key = NULL; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1107 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1108 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1109 | if (sent) |
| 1110 | return (sent); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1111 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1112 | return (0); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1113 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1114 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1115 | /* |
| 1116 | * Send userauth request message specifying keyboard-interactive method. |
| 1117 | */ |
| 1118 | int |
| 1119 | userauth_kbdint(Authctxt *authctxt) |
| 1120 | { |
| 1121 | static int attempt = 0; |
| 1122 | |
| 1123 | if (attempt++ >= options.number_of_password_prompts) |
| 1124 | return 0; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1125 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
| 1126 | if (attempt > 1 && !authctxt->info_req_seen) { |
| 1127 | debug3("userauth_kbdint: disable: no info_req_seen"); |
| 1128 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); |
| 1129 | return 0; |
| 1130 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1131 | |
| 1132 | debug2("userauth_kbdint"); |
| 1133 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 1134 | packet_put_cstring(authctxt->server_user); |
| 1135 | packet_put_cstring(authctxt->service); |
| 1136 | packet_put_cstring(authctxt->method->name); |
| 1137 | packet_put_cstring(""); /* lang */ |
| 1138 | packet_put_cstring(options.kbd_interactive_devices ? |
| 1139 | options.kbd_interactive_devices : ""); |
| 1140 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1141 | |
| 1142 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); |
| 1143 | return 1; |
| 1144 | } |
| 1145 | |
| 1146 | /* |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1147 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1148 | */ |
| 1149 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1150 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1151 | { |
| 1152 | Authctxt *authctxt = ctxt; |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1153 | char *name, *inst, *lang, *prompt, *response; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1154 | u_int num_prompts, i; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1155 | int echo = 0; |
| 1156 | |
| 1157 | debug2("input_userauth_info_req"); |
| 1158 | |
| 1159 | if (authctxt == NULL) |
| 1160 | fatal("input_userauth_info_req: no authentication context"); |
| 1161 | |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1162 | authctxt->info_req_seen = 1; |
| 1163 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1164 | name = packet_get_string(NULL); |
| 1165 | inst = packet_get_string(NULL); |
| 1166 | lang = packet_get_string(NULL); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1167 | if (strlen(name) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1168 | logit("%s", name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1169 | if (strlen(inst) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1170 | logit("%s", inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1171 | xfree(name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1172 | xfree(inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1173 | xfree(lang); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1174 | |
| 1175 | num_prompts = packet_get_int(); |
| 1176 | /* |
| 1177 | * Begin to build info response packet based on prompts requested. |
| 1178 | * We commit to providing the correct number of responses, so if |
| 1179 | * further on we run into a problem that prevents this, we have to |
| 1180 | * be sure and clean this up and send a correct error response. |
| 1181 | */ |
| 1182 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); |
| 1183 | packet_put_int(num_prompts); |
| 1184 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 1185 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1186 | for (i = 0; i < num_prompts; i++) { |
| 1187 | prompt = packet_get_string(NULL); |
| 1188 | echo = packet_get_char(); |
| 1189 | |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 1190 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1191 | |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 1192 | packet_put_cstring(response); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1193 | memset(response, 0, strlen(response)); |
| 1194 | xfree(response); |
| 1195 | xfree(prompt); |
| 1196 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1197 | packet_check_eom(); /* done with parsing incoming message. */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1198 | |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 1199 | packet_add_padding(64); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1200 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1201 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1202 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1203 | static int |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 1204 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1205 | u_char *data, u_int datalen) |
| 1206 | { |
| 1207 | Buffer b; |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1208 | struct stat st; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1209 | pid_t pid; |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1210 | int to[2], from[2], status, version = 2; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1211 | |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1212 | debug2("ssh_keysign called"); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1213 | |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1214 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
| 1215 | error("ssh_keysign: no installed: %s", strerror(errno)); |
| 1216 | return -1; |
| 1217 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1218 | if (fflush(stdout) != 0) |
| 1219 | error("ssh_keysign: fflush: %s", strerror(errno)); |
| 1220 | if (pipe(to) < 0) { |
| 1221 | error("ssh_keysign: pipe: %s", strerror(errno)); |
| 1222 | return -1; |
| 1223 | } |
| 1224 | if (pipe(from) < 0) { |
| 1225 | error("ssh_keysign: pipe: %s", strerror(errno)); |
| 1226 | return -1; |
| 1227 | } |
| 1228 | if ((pid = fork()) < 0) { |
| 1229 | error("ssh_keysign: fork: %s", strerror(errno)); |
| 1230 | return -1; |
| 1231 | } |
| 1232 | if (pid == 0) { |
| 1233 | seteuid(getuid()); |
| 1234 | setuid(getuid()); |
| 1235 | close(from[0]); |
| 1236 | if (dup2(from[1], STDOUT_FILENO) < 0) |
| 1237 | fatal("ssh_keysign: dup2: %s", strerror(errno)); |
| 1238 | close(to[1]); |
| 1239 | if (dup2(to[0], STDIN_FILENO) < 0) |
| 1240 | fatal("ssh_keysign: dup2: %s", strerror(errno)); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1241 | close(from[1]); |
| 1242 | close(to[0]); |
Ben Lindstrom | 4887da2 | 2002-06-06 20:05:57 +0000 | [diff] [blame] | 1243 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1244 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
| 1245 | strerror(errno)); |
| 1246 | } |
| 1247 | close(from[1]); |
| 1248 | close(to[0]); |
| 1249 | |
| 1250 | buffer_init(&b); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1251 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1252 | buffer_put_string(&b, data, datalen); |
Damien Miller | 901119b | 2002-10-04 11:10:04 +1000 | [diff] [blame] | 1253 | ssh_msg_send(to[1], version, &b); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1254 | |
Damien Miller | 901119b | 2002-10-04 11:10:04 +1000 | [diff] [blame] | 1255 | if (ssh_msg_recv(from[0], &b) < 0) { |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1256 | error("ssh_keysign: no reply"); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1257 | buffer_clear(&b); |
| 1258 | return -1; |
| 1259 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1260 | close(from[0]); |
| 1261 | close(to[1]); |
| 1262 | |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1263 | while (waitpid(pid, &status, 0) < 0) |
| 1264 | if (errno != EINTR) |
| 1265 | break; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1266 | |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1267 | if (buffer_get_char(&b) != version) { |
| 1268 | error("ssh_keysign: bad version"); |
| 1269 | buffer_clear(&b); |
| 1270 | return -1; |
| 1271 | } |
| 1272 | *sigp = buffer_get_string(&b, lenp); |
| 1273 | buffer_clear(&b); |
| 1274 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1275 | return 0; |
| 1276 | } |
| 1277 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1278 | int |
| 1279 | userauth_hostbased(Authctxt *authctxt) |
| 1280 | { |
| 1281 | Key *private = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1282 | Sensitive *sensitive = authctxt->sensitive; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1283 | Buffer b; |
| 1284 | u_char *signature, *blob; |
| 1285 | char *chost, *pkalg, *p; |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1286 | const char *service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1287 | u_int blen, slen; |
Ben Lindstrom | 2bffd6f | 2001-04-19 20:35:40 +0000 | [diff] [blame] | 1288 | int ok, i, len, found = 0; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1289 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1290 | /* check for a useful key */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1291 | for (i = 0; i < sensitive->nkeys; i++) { |
| 1292 | private = sensitive->keys[i]; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1293 | if (private && private->type != KEY_RSA1) { |
| 1294 | found = 1; |
| 1295 | /* we take and free the key */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1296 | sensitive->keys[i] = NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1297 | break; |
| 1298 | } |
| 1299 | } |
| 1300 | if (!found) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1301 | debug("No more client hostkeys for hostbased authentication."); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1302 | return 0; |
| 1303 | } |
| 1304 | if (key_to_blob(private, &blob, &blen) == 0) { |
| 1305 | key_free(private); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1306 | return 0; |
| 1307 | } |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1308 | /* figure out a name for the client host */ |
| 1309 | p = get_local_name(packet_get_connection_in()); |
| 1310 | if (p == NULL) { |
| 1311 | error("userauth_hostbased: cannot get local ipaddr/name"); |
| 1312 | key_free(private); |
| 1313 | return 0; |
| 1314 | } |
| 1315 | len = strlen(p) + 2; |
| 1316 | chost = xmalloc(len); |
| 1317 | strlcpy(chost, p, len); |
| 1318 | strlcat(chost, ".", len); |
| 1319 | debug2("userauth_hostbased: chost %s", chost); |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1320 | xfree(p); |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1321 | |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1322 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
| 1323 | authctxt->service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1324 | pkalg = xstrdup(key_ssh_name(private)); |
| 1325 | buffer_init(&b); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1326 | /* construct data */ |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1327 | buffer_put_string(&b, session_id2, session_id2_len); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1328 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
| 1329 | buffer_put_cstring(&b, authctxt->server_user); |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1330 | buffer_put_cstring(&b, service); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1331 | buffer_put_cstring(&b, authctxt->method->name); |
| 1332 | buffer_put_cstring(&b, pkalg); |
| 1333 | buffer_put_string(&b, blob, blen); |
| 1334 | buffer_put_cstring(&b, chost); |
| 1335 | buffer_put_cstring(&b, authctxt->local_user); |
| 1336 | #ifdef DEBUG_PK |
| 1337 | buffer_dump(&b); |
| 1338 | #endif |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1339 | if (sensitive->external_keysign) |
| 1340 | ok = ssh_keysign(private, &signature, &slen, |
| 1341 | buffer_ptr(&b), buffer_len(&b)); |
| 1342 | else |
| 1343 | ok = key_sign(private, &signature, &slen, |
| 1344 | buffer_ptr(&b), buffer_len(&b)); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1345 | key_free(private); |
| 1346 | buffer_free(&b); |
| 1347 | if (ok != 0) { |
| 1348 | error("key_sign failed"); |
| 1349 | xfree(chost); |
| 1350 | xfree(pkalg); |
| 1351 | return 0; |
| 1352 | } |
| 1353 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 1354 | packet_put_cstring(authctxt->server_user); |
| 1355 | packet_put_cstring(authctxt->service); |
| 1356 | packet_put_cstring(authctxt->method->name); |
| 1357 | packet_put_cstring(pkalg); |
| 1358 | packet_put_string(blob, blen); |
| 1359 | packet_put_cstring(chost); |
| 1360 | packet_put_cstring(authctxt->local_user); |
| 1361 | packet_put_string(signature, slen); |
| 1362 | memset(signature, 's', slen); |
| 1363 | xfree(signature); |
| 1364 | xfree(chost); |
| 1365 | xfree(pkalg); |
| 1366 | |
| 1367 | packet_send(); |
| 1368 | return 1; |
| 1369 | } |
| 1370 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1371 | /* find auth method */ |
| 1372 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1373 | /* |
| 1374 | * given auth method name, if configurable options permit this method fill |
| 1375 | * in auth_ident field and return true, otherwise return false. |
| 1376 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1377 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1378 | authmethod_is_enabled(Authmethod *method) |
| 1379 | { |
| 1380 | if (method == NULL) |
| 1381 | return 0; |
| 1382 | /* return false if options indicate this method is disabled */ |
| 1383 | if (method->enabled == NULL || *method->enabled == 0) |
| 1384 | return 0; |
| 1385 | /* return false if batch mode is enabled but method needs interactive mode */ |
| 1386 | if (method->batch_flag != NULL && *method->batch_flag != 0) |
| 1387 | return 0; |
| 1388 | return 1; |
| 1389 | } |
| 1390 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1391 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1392 | authmethod_lookup(const char *name) |
| 1393 | { |
| 1394 | Authmethod *method = NULL; |
| 1395 | if (name != NULL) |
| 1396 | for (method = authmethods; method->name != NULL; method++) |
| 1397 | if (strcmp(name, method->name) == 0) |
| 1398 | return method; |
| 1399 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); |
| 1400 | return NULL; |
| 1401 | } |
| 1402 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1403 | /* XXX internal state */ |
| 1404 | static Authmethod *current = NULL; |
| 1405 | static char *supported = NULL; |
| 1406 | static char *preferred = NULL; |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 1407 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1408 | /* |
| 1409 | * Given the authentication method list sent by the server, return the |
| 1410 | * 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] | 1411 | * use a built-in default list. |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1412 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1413 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1414 | authmethod_get(char *authlist) |
| 1415 | { |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1416 | char *name = NULL; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 1417 | u_int next; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1418 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1419 | /* Use a suitable default if we're passed a nil list. */ |
| 1420 | if (authlist == NULL || strlen(authlist) == 0) |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1421 | authlist = options.preferred_authentications; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1422 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1423 | if (supported == NULL || strcmp(authlist, supported) != 0) { |
| 1424 | debug3("start over, passed a different list %s", authlist); |
| 1425 | if (supported != NULL) |
| 1426 | xfree(supported); |
| 1427 | supported = xstrdup(authlist); |
| 1428 | preferred = options.preferred_authentications; |
| 1429 | debug3("preferred %s", preferred); |
| 1430 | current = NULL; |
| 1431 | } else if (current != NULL && authmethod_is_enabled(current)) |
| 1432 | return current; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1433 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1434 | for (;;) { |
| 1435 | if ((name = match_list(preferred, supported, &next)) == NULL) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1436 | debug("No more authentication methods to try."); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1437 | current = NULL; |
| 1438 | return NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1439 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1440 | preferred += next; |
| 1441 | debug3("authmethod_lookup %s", name); |
| 1442 | debug3("remaining preferred: %s", preferred); |
| 1443 | if ((current = authmethod_lookup(name)) != NULL && |
| 1444 | authmethod_is_enabled(current)) { |
| 1445 | debug3("authmethod_is_enabled %s", name); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1446 | debug("Next authentication method: %s", name); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1447 | return current; |
| 1448 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1449 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1450 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1451 | |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 1452 | static char * |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1453 | authmethods_get(void) |
| 1454 | { |
| 1455 | Authmethod *method = NULL; |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1456 | Buffer b; |
| 1457 | char *list; |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1458 | |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1459 | buffer_init(&b); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1460 | for (method = authmethods; method->name != NULL; method++) { |
| 1461 | if (authmethod_is_enabled(method)) { |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1462 | if (buffer_len(&b) > 0) |
| 1463 | buffer_append(&b, ",", 1); |
| 1464 | buffer_append(&b, method->name, strlen(method->name)); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1465 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1466 | } |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1467 | buffer_append(&b, "\0", 1); |
| 1468 | list = xstrdup(buffer_ptr(&b)); |
| 1469 | buffer_free(&b); |
| 1470 | return list; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1471 | } |