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 | be1a901 | 2003-08-26 12:04:31 +1000 | [diff] [blame] | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.122 2003/08/22 13:20:03 markus 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; |
| 361 | debug3("input_userauth_banner"); |
| 362 | msg = packet_get_string(NULL); |
| 363 | lang = packet_get_string(NULL); |
| 364 | fprintf(stderr, "%s", msg); |
| 365 | xfree(msg); |
| 366 | xfree(lang); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 367 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 368 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 369 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 370 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 371 | { |
| 372 | Authctxt *authctxt = ctxt; |
| 373 | if (authctxt == NULL) |
| 374 | fatal("input_userauth_success: no authentication context"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 375 | if (authctxt->authlist) |
| 376 | xfree(authctxt->authlist); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 377 | if (authctxt->methoddata) |
| 378 | xfree(authctxt->methoddata); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 379 | authctxt->success = 1; /* break out */ |
| 380 | } |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 381 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 382 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 383 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 384 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 385 | Authctxt *authctxt = ctxt; |
| 386 | char *authlist = NULL; |
| 387 | int partial; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 388 | |
| 389 | if (authctxt == NULL) |
| 390 | fatal("input_userauth_failure: no authentication context"); |
| 391 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 392 | authlist = packet_get_string(NULL); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 393 | partial = packet_get_char(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 394 | packet_check_eom(); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 395 | |
| 396 | if (partial != 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 397 | logit("Authenticated with partial success."); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 398 | debug("Authentications that can continue: %s", authlist); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 399 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 400 | userauth(authctxt, authlist); |
| 401 | } |
| 402 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 403 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 404 | { |
| 405 | Authctxt *authctxt = ctxt; |
| 406 | Key *key = NULL; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 407 | Identity *id = NULL; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 408 | Buffer b; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 409 | int pktype, sent = 0; |
| 410 | u_int alen, blen; |
| 411 | char *pkalg, *fp; |
| 412 | u_char *pkblob; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 413 | |
| 414 | if (authctxt == NULL) |
| 415 | fatal("input_userauth_pk_ok: no authentication context"); |
| 416 | if (datafellows & SSH_BUG_PKOK) { |
| 417 | /* this is similar to SSH_BUG_PKAUTH */ |
| 418 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); |
| 419 | pkblob = packet_get_string(&blen); |
| 420 | buffer_init(&b); |
| 421 | buffer_append(&b, pkblob, blen); |
| 422 | pkalg = buffer_get_string(&b, &alen); |
| 423 | buffer_free(&b); |
| 424 | } else { |
| 425 | pkalg = packet_get_string(&alen); |
| 426 | pkblob = packet_get_string(&blen); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 427 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 428 | packet_check_eom(); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 429 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 430 | debug("Server accepts key: pkalg %s blen %u", pkalg, blen); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 431 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 432 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
| 433 | debug("unknown pkalg %s", pkalg); |
| 434 | goto done; |
| 435 | } |
| 436 | if ((key = key_from_blob(pkblob, blen)) == NULL) { |
| 437 | debug("no key from blob. pkalg %s", pkalg); |
| 438 | goto done; |
| 439 | } |
| 440 | if (key->type != pktype) { |
| 441 | error("input_userauth_pk_ok: type mismatch " |
| 442 | "for decoded key (received %d, expected %d)", |
| 443 | key->type, pktype); |
| 444 | goto done; |
| 445 | } |
| 446 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); |
| 447 | debug2("input_userauth_pk_ok: fp %s", fp); |
| 448 | xfree(fp); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 449 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 450 | TAILQ_FOREACH(id, &authctxt->keys, next) { |
| 451 | if (key_equal(key, id->key)) { |
| 452 | sent = sign_and_send_pubkey(authctxt, id); |
| 453 | break; |
| 454 | } |
| 455 | } |
| 456 | done: |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 457 | if (key != NULL) |
| 458 | key_free(key); |
| 459 | xfree(pkalg); |
| 460 | xfree(pkblob); |
| 461 | |
Ben Lindstrom | a962c2f | 2002-07-04 00:14:17 +0000 | [diff] [blame] | 462 | /* try another method if we did not send a packet */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 463 | if (sent == 0) |
| 464 | userauth(authctxt, NULL); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 465 | } |
| 466 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 467 | #ifdef GSSAPI |
| 468 | int |
| 469 | userauth_gssapi(Authctxt *authctxt) |
| 470 | { |
| 471 | Gssctxt *gssctxt = NULL; |
| 472 | static gss_OID_set supported = NULL; |
| 473 | static int mech = 0; |
| 474 | OM_uint32 min; |
| 475 | int ok = 0; |
| 476 | |
| 477 | /* Try one GSSAPI method at a time, rather than sending them all at |
| 478 | * once. */ |
| 479 | |
| 480 | if (supported == NULL) |
| 481 | gss_indicate_mechs(&min, &supported); |
| 482 | |
| 483 | /* Check to see if the mechanism is usable before we offer it */ |
| 484 | while (mech<supported->count && !ok) { |
| 485 | if (gssctxt) |
| 486 | ssh_gssapi_delete_ctx(&gssctxt); |
| 487 | ssh_gssapi_build_ctx(&gssctxt); |
| 488 | ssh_gssapi_set_oid(gssctxt, &supported->elements[mech]); |
| 489 | |
| 490 | /* My DER encoding requires length<128 */ |
| 491 | if (supported->elements[mech].length < 128 && |
| 492 | !GSS_ERROR(ssh_gssapi_import_name(gssctxt, |
| 493 | authctxt->host))) { |
| 494 | ok = 1; /* Mechanism works */ |
| 495 | } else { |
| 496 | mech++; |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | if (!ok) return 0; |
| 501 | |
| 502 | authctxt->methoddata=(void *)gssctxt; |
| 503 | |
| 504 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 505 | packet_put_cstring(authctxt->server_user); |
| 506 | packet_put_cstring(authctxt->service); |
| 507 | packet_put_cstring(authctxt->method->name); |
| 508 | |
| 509 | packet_put_int(1); |
| 510 | |
| 511 | /* Some servers encode the OID incorrectly (as we used to) */ |
| 512 | if (datafellows & SSH_BUG_GSSAPI_BER) { |
| 513 | packet_put_string(supported->elements[mech].elements, |
| 514 | supported->elements[mech].length); |
| 515 | } else { |
| 516 | packet_put_int((supported->elements[mech].length)+2); |
| 517 | packet_put_char(SSH_GSS_OIDTYPE); |
| 518 | packet_put_char(supported->elements[mech].length); |
| 519 | packet_put_raw(supported->elements[mech].elements, |
| 520 | supported->elements[mech].length); |
| 521 | } |
| 522 | |
| 523 | packet_send(); |
| 524 | |
| 525 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); |
| 526 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); |
| 527 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); |
| 528 | dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); |
| 529 | |
| 530 | mech++; /* Move along to next candidate */ |
| 531 | |
| 532 | return 1; |
| 533 | } |
| 534 | |
| 535 | void |
| 536 | input_gssapi_response(int type, u_int32_t plen, void *ctxt) |
| 537 | { |
| 538 | Authctxt *authctxt = ctxt; |
| 539 | Gssctxt *gssctxt; |
| 540 | OM_uint32 status, ms; |
| 541 | int oidlen; |
| 542 | char *oidv; |
| 543 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 544 | |
| 545 | if (authctxt == NULL) |
| 546 | fatal("input_gssapi_response: no authentication context"); |
| 547 | gssctxt = authctxt->methoddata; |
| 548 | |
| 549 | /* Setup our OID */ |
| 550 | oidv = packet_get_string(&oidlen); |
| 551 | |
| 552 | if (datafellows & SSH_BUG_GSSAPI_BER) { |
| 553 | if (!ssh_gssapi_check_oid(gssctxt, oidv, oidlen)) |
| 554 | fatal("Server returned different OID than expected"); |
| 555 | } else { |
| 556 | if(oidv[0] != SSH_GSS_OIDTYPE || oidv[1] != oidlen-2) { |
| 557 | debug("Badly encoded mechanism OID received"); |
| 558 | userauth(authctxt, NULL); |
| 559 | xfree(oidv); |
| 560 | return; |
| 561 | } |
| 562 | if (!ssh_gssapi_check_oid(gssctxt, oidv+2, oidlen-2)) |
| 563 | fatal("Server returned different OID than expected"); |
| 564 | } |
| 565 | |
| 566 | packet_check_eom(); |
| 567 | |
| 568 | xfree(oidv); |
| 569 | |
| 570 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
| 571 | GSS_C_NO_BUFFER, &send_tok, NULL); |
| 572 | if (GSS_ERROR(status)) { |
| 573 | if (send_tok.length > 0) { |
| 574 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); |
| 575 | packet_put_string(send_tok.value, send_tok.length); |
| 576 | packet_send(); |
| 577 | gss_release_buffer(&ms, &send_tok); |
| 578 | } |
| 579 | /* Start again with next method on list */ |
| 580 | debug("Trying to start again"); |
| 581 | userauth(authctxt, NULL); |
| 582 | return; |
| 583 | } |
| 584 | |
| 585 | /* We must have data to send */ |
| 586 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); |
| 587 | packet_put_string(send_tok.value, send_tok.length); |
| 588 | packet_send(); |
| 589 | gss_release_buffer(&ms, &send_tok); |
| 590 | } |
| 591 | |
| 592 | void |
| 593 | input_gssapi_token(int type, u_int32_t plen, void *ctxt) |
| 594 | { |
| 595 | Authctxt *authctxt = ctxt; |
| 596 | Gssctxt *gssctxt; |
| 597 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 598 | gss_buffer_desc recv_tok; |
| 599 | OM_uint32 status, ms; |
| 600 | u_int slen; |
| 601 | |
| 602 | if (authctxt == NULL) |
| 603 | fatal("input_gssapi_response: no authentication context"); |
| 604 | gssctxt = authctxt->methoddata; |
| 605 | |
| 606 | recv_tok.value = packet_get_string(&slen); |
| 607 | recv_tok.length = slen; /* safe typecast */ |
| 608 | |
| 609 | packet_check_eom(); |
| 610 | |
| 611 | status=ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
| 612 | &recv_tok, &send_tok, NULL); |
| 613 | |
| 614 | xfree(recv_tok.value); |
| 615 | |
| 616 | if (GSS_ERROR(status)) { |
| 617 | if (send_tok.length > 0) { |
| 618 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK); |
| 619 | packet_put_string(send_tok.value, send_tok.length); |
| 620 | packet_send(); |
| 621 | gss_release_buffer(&ms, &send_tok); |
| 622 | } |
| 623 | /* Start again with the next method in the list */ |
| 624 | userauth(authctxt, NULL); |
| 625 | return; |
| 626 | } |
| 627 | |
| 628 | if (send_tok.length > 0) { |
| 629 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN); |
| 630 | packet_put_string(send_tok.value, send_tok.length); |
| 631 | packet_send(); |
| 632 | gss_release_buffer(&ms, &send_tok); |
| 633 | } |
| 634 | |
| 635 | if (status == GSS_S_COMPLETE) { |
| 636 | /* If that succeeded, send a exchange complete message */ |
| 637 | packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE); |
| 638 | packet_send(); |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | void |
| 643 | input_gssapi_errtok(int type, u_int32_t plen, void *ctxt) |
| 644 | { |
| 645 | Authctxt *authctxt = ctxt; |
| 646 | Gssctxt *gssctxt; |
| 647 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 648 | gss_buffer_desc recv_tok; |
| 649 | OM_uint32 status, ms; |
| 650 | |
| 651 | if (authctxt == NULL) |
| 652 | fatal("input_gssapi_response: no authentication context"); |
| 653 | gssctxt = authctxt->methoddata; |
| 654 | |
| 655 | recv_tok.value = packet_get_string(&recv_tok.length); |
| 656 | |
| 657 | packet_check_eom(); |
| 658 | |
| 659 | /* Stick it into GSSAPI and see what it says */ |
| 660 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
| 661 | &recv_tok, &send_tok, NULL); |
| 662 | |
| 663 | xfree(recv_tok.value); |
| 664 | gss_release_buffer(&ms, &send_tok); |
| 665 | |
| 666 | /* Server will be returning a failed packet after this one */ |
| 667 | } |
| 668 | |
| 669 | void |
| 670 | input_gssapi_error(int type, u_int32_t plen, void *ctxt) |
| 671 | { |
| 672 | OM_uint32 maj, min; |
| 673 | char *msg; |
| 674 | char *lang; |
| 675 | |
| 676 | maj=packet_get_int(); |
| 677 | min=packet_get_int(); |
| 678 | msg=packet_get_string(NULL); |
| 679 | lang=packet_get_string(NULL); |
| 680 | |
| 681 | packet_check_eom(); |
| 682 | |
| 683 | debug("Server GSSAPI Error:\n%s\n", msg); |
| 684 | xfree(msg); |
| 685 | xfree(lang); |
| 686 | } |
| 687 | #endif /* GSSAPI */ |
| 688 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 689 | int |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 690 | userauth_none(Authctxt *authctxt) |
| 691 | { |
| 692 | /* initial userauth request */ |
| 693 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 694 | packet_put_cstring(authctxt->server_user); |
| 695 | packet_put_cstring(authctxt->service); |
| 696 | packet_put_cstring(authctxt->method->name); |
| 697 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 698 | return 1; |
| 699 | } |
| 700 | |
| 701 | int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 702 | userauth_passwd(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 703 | { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 704 | static int attempt = 0; |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 705 | char prompt[150]; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 706 | char *password; |
| 707 | |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 708 | if (attempt++ >= options.number_of_password_prompts) |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 709 | return 0; |
| 710 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 711 | if (attempt != 1) |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 712 | error("Permission denied, please try again."); |
| 713 | |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 714 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 715 | authctxt->server_user, authctxt->host); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 716 | password = read_passphrase(prompt, 0); |
| 717 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 718 | packet_put_cstring(authctxt->server_user); |
| 719 | packet_put_cstring(authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 720 | packet_put_cstring(authctxt->method->name); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 721 | packet_put_char(0); |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 722 | packet_put_cstring(password); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 723 | memset(password, 0, strlen(password)); |
| 724 | xfree(password); |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 725 | packet_add_padding(64); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 726 | packet_send(); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 727 | |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 728 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 729 | &input_userauth_passwd_changereq); |
| 730 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 731 | return 1; |
| 732 | } |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 733 | /* |
| 734 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST |
| 735 | */ |
| 736 | void |
Tim Rice | c854962 | 2002-03-31 12:49:38 -0800 | [diff] [blame] | 737 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt) |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 738 | { |
| 739 | Authctxt *authctxt = ctxt; |
| 740 | char *info, *lang, *password = NULL, *retype = NULL; |
| 741 | char prompt[150]; |
| 742 | |
| 743 | debug2("input_userauth_passwd_changereq"); |
| 744 | |
| 745 | if (authctxt == NULL) |
| 746 | fatal("input_userauth_passwd_changereq: " |
| 747 | "no authentication context"); |
| 748 | |
| 749 | info = packet_get_string(NULL); |
| 750 | lang = packet_get_string(NULL); |
| 751 | if (strlen(info) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 752 | logit("%s", info); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 753 | xfree(info); |
| 754 | xfree(lang); |
| 755 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 756 | packet_put_cstring(authctxt->server_user); |
| 757 | packet_put_cstring(authctxt->service); |
| 758 | packet_put_cstring(authctxt->method->name); |
| 759 | packet_put_char(1); /* additional info */ |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 760 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 761 | "Enter %.30s@%.128s's old password: ", |
| 762 | authctxt->server_user, authctxt->host); |
| 763 | password = read_passphrase(prompt, 0); |
| 764 | packet_put_cstring(password); |
| 765 | memset(password, 0, strlen(password)); |
| 766 | xfree(password); |
| 767 | password = NULL; |
| 768 | while (password == NULL) { |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 769 | snprintf(prompt, sizeof(prompt), |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 770 | "Enter %.30s@%.128s's new password: ", |
| 771 | authctxt->server_user, authctxt->host); |
| 772 | password = read_passphrase(prompt, RP_ALLOW_EOF); |
| 773 | if (password == NULL) { |
| 774 | /* bail out */ |
| 775 | return; |
| 776 | } |
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 | "Retype %.30s@%.128s's new password: ", |
| 779 | authctxt->server_user, authctxt->host); |
| 780 | retype = read_passphrase(prompt, 0); |
| 781 | if (strcmp(password, retype) != 0) { |
| 782 | memset(password, 0, strlen(password)); |
| 783 | xfree(password); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 784 | logit("Mismatch; try again, EOF to quit."); |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 785 | password = NULL; |
| 786 | } |
| 787 | memset(retype, 0, strlen(retype)); |
| 788 | xfree(retype); |
| 789 | } |
| 790 | packet_put_cstring(password); |
| 791 | memset(password, 0, strlen(password)); |
| 792 | xfree(password); |
| 793 | packet_add_padding(64); |
| 794 | packet_send(); |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 795 | |
| 796 | dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, |
Ben Lindstrom | 38a69e6 | 2002-03-27 17:28:46 +0000 | [diff] [blame] | 797 | &input_userauth_passwd_changereq); |
| 798 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 799 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 800 | static int |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 801 | identity_sign(Identity *id, u_char **sigp, u_int *lenp, |
| 802 | u_char *data, u_int datalen) |
| 803 | { |
| 804 | Key *prv; |
| 805 | int ret; |
| 806 | |
| 807 | /* the agent supports this key */ |
| 808 | if (id->ac) |
| 809 | return (ssh_agent_sign(id->ac, id->key, sigp, lenp, |
| 810 | data, datalen)); |
| 811 | /* |
| 812 | * we have already loaded the private key or |
| 813 | * the private key is stored in external hardware |
| 814 | */ |
| 815 | if (id->isprivate || (id->key->flags & KEY_FLAG_EXT)) |
| 816 | return (key_sign(id->key, sigp, lenp, data, datalen)); |
| 817 | /* load the private key from the file */ |
| 818 | if ((prv = load_identity_file(id->filename)) == NULL) |
| 819 | return (-1); |
| 820 | ret = key_sign(prv, sigp, lenp, data, datalen); |
| 821 | key_free(prv); |
| 822 | return (ret); |
| 823 | } |
| 824 | |
| 825 | static int |
| 826 | sign_and_send_pubkey(Authctxt *authctxt, Identity *id) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 827 | { |
| 828 | Buffer b; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 829 | u_char *blob, *signature; |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 830 | u_int bloblen, slen; |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 831 | u_int skip = 0; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 832 | int ret = -1; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 833 | int have_sig = 1; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 834 | |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 835 | debug3("sign_and_send_pubkey"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 836 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 837 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 838 | /* we cannot handle this key */ |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 839 | debug3("sign_and_send_pubkey: cannot handle key"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 840 | return 0; |
| 841 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 842 | /* data to be signed */ |
| 843 | buffer_init(&b); |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 844 | if (datafellows & SSH_OLD_SESSIONID) { |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 845 | buffer_append(&b, session_id2, session_id2_len); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 846 | skip = session_id2_len; |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 847 | } else { |
| 848 | buffer_put_string(&b, session_id2, session_id2_len); |
| 849 | skip = buffer_len(&b); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 850 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 851 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 852 | buffer_put_cstring(&b, authctxt->server_user); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 853 | buffer_put_cstring(&b, |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 854 | datafellows & SSH_BUG_PKSERVICE ? |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 855 | "ssh-userauth" : |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 856 | authctxt->service); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 857 | if (datafellows & SSH_BUG_PKAUTH) { |
| 858 | buffer_put_char(&b, have_sig); |
| 859 | } else { |
| 860 | buffer_put_cstring(&b, authctxt->method->name); |
| 861 | buffer_put_char(&b, have_sig); |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 862 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 863 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 864 | buffer_put_string(&b, blob, bloblen); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 865 | |
| 866 | /* generate signature */ |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 867 | ret = identity_sign(id, &signature, &slen, |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 868 | buffer_ptr(&b), buffer_len(&b)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 869 | if (ret == -1) { |
| 870 | xfree(blob); |
| 871 | buffer_free(&b); |
| 872 | return 0; |
| 873 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 874 | #ifdef DEBUG_PK |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 875 | buffer_dump(&b); |
| 876 | #endif |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 877 | if (datafellows & SSH_BUG_PKSERVICE) { |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 878 | buffer_clear(&b); |
| 879 | buffer_append(&b, session_id2, session_id2_len); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 880 | skip = session_id2_len; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 881 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 882 | buffer_put_cstring(&b, authctxt->server_user); |
| 883 | buffer_put_cstring(&b, authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 884 | buffer_put_cstring(&b, authctxt->method->name); |
| 885 | buffer_put_char(&b, have_sig); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 886 | if (!(datafellows & SSH_BUG_PKAUTH)) |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 887 | buffer_put_cstring(&b, key_ssh_name(id->key)); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 888 | buffer_put_string(&b, blob, bloblen); |
| 889 | } |
| 890 | xfree(blob); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 891 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 892 | /* append signature */ |
| 893 | buffer_put_string(&b, signature, slen); |
| 894 | xfree(signature); |
| 895 | |
| 896 | /* skip session id and packet type */ |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 897 | if (buffer_len(&b) < skip + 1) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 898 | fatal("userauth_pubkey: internal error"); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 899 | buffer_consume(&b, skip + 1); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 900 | |
| 901 | /* put remaining data from buffer into packet */ |
| 902 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 903 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); |
| 904 | buffer_free(&b); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 905 | packet_send(); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 906 | |
| 907 | return 1; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 908 | } |
| 909 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 910 | static int |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 911 | send_pubkey_test(Authctxt *authctxt, Identity *id) |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 912 | { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 913 | u_char *blob; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 914 | u_int bloblen, have_sig = 0; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 915 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 916 | debug3("send_pubkey_test"); |
| 917 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 918 | if (key_to_blob(id->key, &blob, &bloblen) == 0) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 919 | /* we cannot handle this key */ |
| 920 | debug3("send_pubkey_test: cannot handle key"); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 921 | return 0; |
| 922 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 923 | /* register callback for USERAUTH_PK_OK message */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 924 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 925 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 926 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 927 | packet_put_cstring(authctxt->server_user); |
| 928 | packet_put_cstring(authctxt->service); |
| 929 | packet_put_cstring(authctxt->method->name); |
| 930 | packet_put_char(have_sig); |
| 931 | if (!(datafellows & SSH_BUG_PKAUTH)) |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 932 | packet_put_cstring(key_ssh_name(id->key)); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 933 | packet_put_string(blob, bloblen); |
| 934 | xfree(blob); |
| 935 | packet_send(); |
| 936 | return 1; |
| 937 | } |
| 938 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 939 | static Key * |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 940 | load_identity_file(char *filename) |
| 941 | { |
| 942 | Key *private; |
| 943 | char prompt[300], *passphrase; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 944 | int quit, i; |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 945 | struct stat st; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 946 | |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 947 | if (stat(filename, &st) < 0) { |
| 948 | debug3("no such identity: %s", filename); |
| 949 | return NULL; |
| 950 | } |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 951 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL); |
| 952 | if (private == NULL) { |
| 953 | if (options.batch_mode) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 954 | return NULL; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 955 | snprintf(prompt, sizeof prompt, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 956 | "Enter passphrase for key '%.100s': ", filename); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 957 | for (i = 0; i < options.number_of_password_prompts; i++) { |
| 958 | passphrase = read_passphrase(prompt, 0); |
| 959 | if (strcmp(passphrase, "") != 0) { |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 960 | private = key_load_private_type(KEY_UNSPEC, filename, |
| 961 | passphrase, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 962 | quit = 0; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 963 | } else { |
| 964 | debug2("no passphrase given, try next key"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 965 | quit = 1; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 966 | } |
| 967 | memset(passphrase, 0, strlen(passphrase)); |
| 968 | xfree(passphrase); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 969 | if (private != NULL || quit) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 970 | break; |
| 971 | debug2("bad passphrase given, try again..."); |
| 972 | } |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 973 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 974 | return private; |
| 975 | } |
| 976 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 977 | /* |
| 978 | * try keys in the following order: |
| 979 | * 1. agent keys that are found in the config file |
| 980 | * 2. other agent keys |
| 981 | * 3. keys that are only listed in the config file |
| 982 | */ |
| 983 | static void |
| 984 | pubkey_prepare(Authctxt *authctxt) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 985 | { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 986 | Identity *id; |
| 987 | Idlist agent, files, *preferred; |
| 988 | Key *key; |
| 989 | AuthenticationConnection *ac; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 990 | char *comment; |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 991 | int i, found; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 992 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 993 | TAILQ_INIT(&agent); /* keys from the agent */ |
| 994 | TAILQ_INIT(&files); /* keys from the config file */ |
| 995 | preferred = &authctxt->keys; |
| 996 | TAILQ_INIT(preferred); /* preferred order of keys */ |
| 997 | |
| 998 | /* list of keys stored in the filesystem */ |
| 999 | for (i = 0; i < options.num_identity_files; i++) { |
| 1000 | key = options.identity_keys[i]; |
| 1001 | if (key && key->type == KEY_RSA1) |
| 1002 | continue; |
| 1003 | options.identity_keys[i] = NULL; |
| 1004 | id = xmalloc(sizeof(*id)); |
| 1005 | memset(id, 0, sizeof(*id)); |
| 1006 | id->key = key; |
| 1007 | id->filename = xstrdup(options.identity_files[i]); |
| 1008 | TAILQ_INSERT_TAIL(&files, id, next); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1009 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1010 | /* list of keys supported by the agent */ |
| 1011 | if ((ac = ssh_get_authentication_connection())) { |
| 1012 | for (key = ssh_get_first_identity(ac, &comment, 2); |
| 1013 | key != NULL; |
| 1014 | key = ssh_get_next_identity(ac, &comment, 2)) { |
| 1015 | found = 0; |
| 1016 | TAILQ_FOREACH(id, &files, next) { |
| 1017 | /* agent keys from the config file are preferred */ |
| 1018 | if (key_equal(key, id->key)) { |
| 1019 | key_free(key); |
| 1020 | xfree(comment); |
| 1021 | TAILQ_REMOVE(&files, id, next); |
| 1022 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1023 | id->ac = ac; |
| 1024 | found = 1; |
| 1025 | break; |
| 1026 | } |
| 1027 | } |
| 1028 | if (!found) { |
| 1029 | id = xmalloc(sizeof(*id)); |
| 1030 | memset(id, 0, sizeof(*id)); |
| 1031 | id->key = key; |
| 1032 | id->filename = comment; |
| 1033 | id->ac = ac; |
| 1034 | TAILQ_INSERT_TAIL(&agent, id, next); |
| 1035 | } |
| 1036 | } |
| 1037 | /* append remaining agent keys */ |
| 1038 | for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) { |
| 1039 | TAILQ_REMOVE(&agent, id, next); |
| 1040 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1041 | } |
| 1042 | authctxt->agent = ac; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1043 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1044 | /* append remaining keys from the config file */ |
| 1045 | for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) { |
| 1046 | TAILQ_REMOVE(&files, id, next); |
| 1047 | TAILQ_INSERT_TAIL(preferred, id, next); |
| 1048 | } |
| 1049 | TAILQ_FOREACH(id, preferred, next) { |
| 1050 | debug2("key: %s (%p)", id->filename, id->key); |
| 1051 | } |
| 1052 | } |
| 1053 | |
| 1054 | static void |
| 1055 | pubkey_cleanup(Authctxt *authctxt) |
| 1056 | { |
| 1057 | Identity *id; |
| 1058 | |
| 1059 | if (authctxt->agent != NULL) |
| 1060 | ssh_close_authentication_connection(authctxt->agent); |
| 1061 | for (id = TAILQ_FIRST(&authctxt->keys); id; |
| 1062 | id = TAILQ_FIRST(&authctxt->keys)) { |
| 1063 | TAILQ_REMOVE(&authctxt->keys, id, next); |
| 1064 | if (id->key) |
| 1065 | key_free(id->key); |
| 1066 | if (id->filename) |
| 1067 | xfree(id->filename); |
| 1068 | xfree(id); |
| 1069 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1070 | } |
| 1071 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1072 | int |
| 1073 | userauth_pubkey(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1074 | { |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1075 | Identity *id; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1076 | int sent = 0; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1077 | |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1078 | while ((id = TAILQ_FIRST(&authctxt->keys))) { |
| 1079 | if (id->tried++) |
| 1080 | return (0); |
| 1081 | TAILQ_REMOVE(&authctxt->keys, id, next); |
| 1082 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next); |
| 1083 | /* |
| 1084 | * send a test message if we have the public key. for |
| 1085 | * encrypted keys we cannot do this and have to load the |
| 1086 | * private key instead |
| 1087 | */ |
| 1088 | if (id->key && id->key->type != KEY_RSA1) { |
| 1089 | debug("Offering public key: %s", id->filename); |
| 1090 | sent = send_pubkey_test(authctxt, id); |
| 1091 | } else if (id->key == NULL) { |
| 1092 | debug("Trying private key: %s", id->filename); |
| 1093 | id->key = load_identity_file(id->filename); |
| 1094 | if (id->key != NULL) { |
| 1095 | id->isprivate = 1; |
| 1096 | sent = sign_and_send_pubkey(authctxt, id); |
| 1097 | key_free(id->key); |
| 1098 | id->key = NULL; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1099 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 1100 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1101 | if (sent) |
| 1102 | return (sent); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1103 | } |
Damien Miller | 280ecfb | 2003-05-14 13:46:00 +1000 | [diff] [blame] | 1104 | return (0); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1105 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1106 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1107 | /* |
| 1108 | * Send userauth request message specifying keyboard-interactive method. |
| 1109 | */ |
| 1110 | int |
| 1111 | userauth_kbdint(Authctxt *authctxt) |
| 1112 | { |
| 1113 | static int attempt = 0; |
| 1114 | |
| 1115 | if (attempt++ >= options.number_of_password_prompts) |
| 1116 | return 0; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1117 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
| 1118 | if (attempt > 1 && !authctxt->info_req_seen) { |
| 1119 | debug3("userauth_kbdint: disable: no info_req_seen"); |
| 1120 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); |
| 1121 | return 0; |
| 1122 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1123 | |
| 1124 | debug2("userauth_kbdint"); |
| 1125 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 1126 | packet_put_cstring(authctxt->server_user); |
| 1127 | packet_put_cstring(authctxt->service); |
| 1128 | packet_put_cstring(authctxt->method->name); |
| 1129 | packet_put_cstring(""); /* lang */ |
| 1130 | packet_put_cstring(options.kbd_interactive_devices ? |
| 1131 | options.kbd_interactive_devices : ""); |
| 1132 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1133 | |
| 1134 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); |
| 1135 | return 1; |
| 1136 | } |
| 1137 | |
| 1138 | /* |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1139 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1140 | */ |
| 1141 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1142 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1143 | { |
| 1144 | Authctxt *authctxt = ctxt; |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1145 | char *name, *inst, *lang, *prompt, *response; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1146 | u_int num_prompts, i; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1147 | int echo = 0; |
| 1148 | |
| 1149 | debug2("input_userauth_info_req"); |
| 1150 | |
| 1151 | if (authctxt == NULL) |
| 1152 | fatal("input_userauth_info_req: no authentication context"); |
| 1153 | |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 1154 | authctxt->info_req_seen = 1; |
| 1155 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1156 | name = packet_get_string(NULL); |
| 1157 | inst = packet_get_string(NULL); |
| 1158 | lang = packet_get_string(NULL); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1159 | if (strlen(name) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1160 | logit("%s", name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1161 | if (strlen(inst) > 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1162 | logit("%s", inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1163 | xfree(name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1164 | xfree(inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 1165 | xfree(lang); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1166 | |
| 1167 | num_prompts = packet_get_int(); |
| 1168 | /* |
| 1169 | * Begin to build info response packet based on prompts requested. |
| 1170 | * We commit to providing the correct number of responses, so if |
| 1171 | * further on we run into a problem that prevents this, we have to |
| 1172 | * be sure and clean this up and send a correct error response. |
| 1173 | */ |
| 1174 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); |
| 1175 | packet_put_int(num_prompts); |
| 1176 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 1177 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1178 | for (i = 0; i < num_prompts; i++) { |
| 1179 | prompt = packet_get_string(NULL); |
| 1180 | echo = packet_get_char(); |
| 1181 | |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 1182 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1183 | |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 1184 | packet_put_cstring(response); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1185 | memset(response, 0, strlen(response)); |
| 1186 | xfree(response); |
| 1187 | xfree(prompt); |
| 1188 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1189 | packet_check_eom(); /* done with parsing incoming message. */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1190 | |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 1191 | packet_add_padding(64); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1192 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1193 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1194 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1195 | static int |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 1196 | ssh_keysign(Key *key, u_char **sigp, u_int *lenp, |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1197 | u_char *data, u_int datalen) |
| 1198 | { |
| 1199 | Buffer b; |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1200 | struct stat st; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1201 | pid_t pid; |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1202 | int to[2], from[2], status, version = 2; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1203 | |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1204 | debug2("ssh_keysign called"); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1205 | |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1206 | if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) { |
| 1207 | error("ssh_keysign: no installed: %s", strerror(errno)); |
| 1208 | return -1; |
| 1209 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1210 | if (fflush(stdout) != 0) |
| 1211 | error("ssh_keysign: fflush: %s", strerror(errno)); |
| 1212 | if (pipe(to) < 0) { |
| 1213 | error("ssh_keysign: pipe: %s", strerror(errno)); |
| 1214 | return -1; |
| 1215 | } |
| 1216 | if (pipe(from) < 0) { |
| 1217 | error("ssh_keysign: pipe: %s", strerror(errno)); |
| 1218 | return -1; |
| 1219 | } |
| 1220 | if ((pid = fork()) < 0) { |
| 1221 | error("ssh_keysign: fork: %s", strerror(errno)); |
| 1222 | return -1; |
| 1223 | } |
| 1224 | if (pid == 0) { |
| 1225 | seteuid(getuid()); |
| 1226 | setuid(getuid()); |
| 1227 | close(from[0]); |
| 1228 | if (dup2(from[1], STDOUT_FILENO) < 0) |
| 1229 | fatal("ssh_keysign: dup2: %s", strerror(errno)); |
| 1230 | close(to[1]); |
| 1231 | if (dup2(to[0], STDIN_FILENO) < 0) |
| 1232 | fatal("ssh_keysign: dup2: %s", strerror(errno)); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1233 | close(from[1]); |
| 1234 | close(to[0]); |
Ben Lindstrom | 4887da2 | 2002-06-06 20:05:57 +0000 | [diff] [blame] | 1235 | execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1236 | fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN, |
| 1237 | strerror(errno)); |
| 1238 | } |
| 1239 | close(from[1]); |
| 1240 | close(to[0]); |
| 1241 | |
| 1242 | buffer_init(&b); |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1243 | buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1244 | buffer_put_string(&b, data, datalen); |
Damien Miller | 901119b | 2002-10-04 11:10:04 +1000 | [diff] [blame] | 1245 | ssh_msg_send(to[1], version, &b); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1246 | |
Damien Miller | 901119b | 2002-10-04 11:10:04 +1000 | [diff] [blame] | 1247 | if (ssh_msg_recv(from[0], &b) < 0) { |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1248 | error("ssh_keysign: no reply"); |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1249 | buffer_clear(&b); |
| 1250 | return -1; |
| 1251 | } |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1252 | close(from[0]); |
| 1253 | close(to[1]); |
| 1254 | |
Ben Lindstrom | cec2ea8 | 2002-06-06 20:51:04 +0000 | [diff] [blame] | 1255 | while (waitpid(pid, &status, 0) < 0) |
| 1256 | if (errno != EINTR) |
| 1257 | break; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1258 | |
Ben Lindstrom | 5206b95 | 2002-06-06 19:59:29 +0000 | [diff] [blame] | 1259 | if (buffer_get_char(&b) != version) { |
| 1260 | error("ssh_keysign: bad version"); |
| 1261 | buffer_clear(&b); |
| 1262 | return -1; |
| 1263 | } |
| 1264 | *sigp = buffer_get_string(&b, lenp); |
| 1265 | buffer_clear(&b); |
| 1266 | |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1267 | return 0; |
| 1268 | } |
| 1269 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1270 | int |
| 1271 | userauth_hostbased(Authctxt *authctxt) |
| 1272 | { |
| 1273 | Key *private = NULL; |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1274 | Sensitive *sensitive = authctxt->sensitive; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1275 | Buffer b; |
| 1276 | u_char *signature, *blob; |
| 1277 | char *chost, *pkalg, *p; |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1278 | const char *service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1279 | u_int blen, slen; |
Ben Lindstrom | 2bffd6f | 2001-04-19 20:35:40 +0000 | [diff] [blame] | 1280 | int ok, i, len, found = 0; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1281 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1282 | /* check for a useful key */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1283 | for (i = 0; i < sensitive->nkeys; i++) { |
| 1284 | private = sensitive->keys[i]; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1285 | if (private && private->type != KEY_RSA1) { |
| 1286 | found = 1; |
| 1287 | /* we take and free the key */ |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1288 | sensitive->keys[i] = NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1289 | break; |
| 1290 | } |
| 1291 | } |
| 1292 | if (!found) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1293 | debug("No more client hostkeys for hostbased authentication."); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1294 | return 0; |
| 1295 | } |
| 1296 | if (key_to_blob(private, &blob, &blen) == 0) { |
| 1297 | key_free(private); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1298 | return 0; |
| 1299 | } |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1300 | /* figure out a name for the client host */ |
| 1301 | p = get_local_name(packet_get_connection_in()); |
| 1302 | if (p == NULL) { |
| 1303 | error("userauth_hostbased: cannot get local ipaddr/name"); |
| 1304 | key_free(private); |
| 1305 | return 0; |
| 1306 | } |
| 1307 | len = strlen(p) + 2; |
| 1308 | chost = xmalloc(len); |
| 1309 | strlcpy(chost, p, len); |
| 1310 | strlcat(chost, ".", len); |
| 1311 | debug2("userauth_hostbased: chost %s", chost); |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1312 | xfree(p); |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 1313 | |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1314 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
| 1315 | authctxt->service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1316 | pkalg = xstrdup(key_ssh_name(private)); |
| 1317 | buffer_init(&b); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1318 | /* construct data */ |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1319 | buffer_put_string(&b, session_id2, session_id2_len); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1320 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
| 1321 | buffer_put_cstring(&b, authctxt->server_user); |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 1322 | buffer_put_cstring(&b, service); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1323 | buffer_put_cstring(&b, authctxt->method->name); |
| 1324 | buffer_put_cstring(&b, pkalg); |
| 1325 | buffer_put_string(&b, blob, blen); |
| 1326 | buffer_put_cstring(&b, chost); |
| 1327 | buffer_put_cstring(&b, authctxt->local_user); |
| 1328 | #ifdef DEBUG_PK |
| 1329 | buffer_dump(&b); |
| 1330 | #endif |
Ben Lindstrom | 1bad256 | 2002-06-06 19:57:33 +0000 | [diff] [blame] | 1331 | if (sensitive->external_keysign) |
| 1332 | ok = ssh_keysign(private, &signature, &slen, |
| 1333 | buffer_ptr(&b), buffer_len(&b)); |
| 1334 | else |
| 1335 | ok = key_sign(private, &signature, &slen, |
| 1336 | buffer_ptr(&b), buffer_len(&b)); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 1337 | key_free(private); |
| 1338 | buffer_free(&b); |
| 1339 | if (ok != 0) { |
| 1340 | error("key_sign failed"); |
| 1341 | xfree(chost); |
| 1342 | xfree(pkalg); |
| 1343 | return 0; |
| 1344 | } |
| 1345 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 1346 | packet_put_cstring(authctxt->server_user); |
| 1347 | packet_put_cstring(authctxt->service); |
| 1348 | packet_put_cstring(authctxt->method->name); |
| 1349 | packet_put_cstring(pkalg); |
| 1350 | packet_put_string(blob, blen); |
| 1351 | packet_put_cstring(chost); |
| 1352 | packet_put_cstring(authctxt->local_user); |
| 1353 | packet_put_string(signature, slen); |
| 1354 | memset(signature, 's', slen); |
| 1355 | xfree(signature); |
| 1356 | xfree(chost); |
| 1357 | xfree(pkalg); |
| 1358 | |
| 1359 | packet_send(); |
| 1360 | return 1; |
| 1361 | } |
| 1362 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1363 | /* find auth method */ |
| 1364 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1365 | /* |
| 1366 | * given auth method name, if configurable options permit this method fill |
| 1367 | * in auth_ident field and return true, otherwise return false. |
| 1368 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1369 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1370 | authmethod_is_enabled(Authmethod *method) |
| 1371 | { |
| 1372 | if (method == NULL) |
| 1373 | return 0; |
| 1374 | /* return false if options indicate this method is disabled */ |
| 1375 | if (method->enabled == NULL || *method->enabled == 0) |
| 1376 | return 0; |
| 1377 | /* return false if batch mode is enabled but method needs interactive mode */ |
| 1378 | if (method->batch_flag != NULL && *method->batch_flag != 0) |
| 1379 | return 0; |
| 1380 | return 1; |
| 1381 | } |
| 1382 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1383 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1384 | authmethod_lookup(const char *name) |
| 1385 | { |
| 1386 | Authmethod *method = NULL; |
| 1387 | if (name != NULL) |
| 1388 | for (method = authmethods; method->name != NULL; method++) |
| 1389 | if (strcmp(name, method->name) == 0) |
| 1390 | return method; |
| 1391 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); |
| 1392 | return NULL; |
| 1393 | } |
| 1394 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1395 | /* XXX internal state */ |
| 1396 | static Authmethod *current = NULL; |
| 1397 | static char *supported = NULL; |
| 1398 | static char *preferred = NULL; |
Ben Lindstrom | 5c38552 | 2002-06-23 21:23:20 +0000 | [diff] [blame] | 1399 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1400 | /* |
| 1401 | * Given the authentication method list sent by the server, return the |
| 1402 | * 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] | 1403 | * use a built-in default list. |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1404 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1405 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1406 | authmethod_get(char *authlist) |
| 1407 | { |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1408 | char *name = NULL; |
Ben Lindstrom | c58ab02 | 2002-02-26 18:15:09 +0000 | [diff] [blame] | 1409 | u_int next; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1410 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1411 | /* Use a suitable default if we're passed a nil list. */ |
| 1412 | if (authlist == NULL || strlen(authlist) == 0) |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1413 | authlist = options.preferred_authentications; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1414 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1415 | if (supported == NULL || strcmp(authlist, supported) != 0) { |
| 1416 | debug3("start over, passed a different list %s", authlist); |
| 1417 | if (supported != NULL) |
| 1418 | xfree(supported); |
| 1419 | supported = xstrdup(authlist); |
| 1420 | preferred = options.preferred_authentications; |
| 1421 | debug3("preferred %s", preferred); |
| 1422 | current = NULL; |
| 1423 | } else if (current != NULL && authmethod_is_enabled(current)) |
| 1424 | return current; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1425 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1426 | for (;;) { |
| 1427 | if ((name = match_list(preferred, supported, &next)) == NULL) { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1428 | debug("No more authentication methods to try."); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1429 | current = NULL; |
| 1430 | return NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 1431 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1432 | preferred += next; |
| 1433 | debug3("authmethod_lookup %s", name); |
| 1434 | debug3("remaining preferred: %s", preferred); |
| 1435 | if ((current = authmethod_lookup(name)) != NULL && |
| 1436 | authmethod_is_enabled(current)) { |
| 1437 | debug3("authmethod_is_enabled %s", name); |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 1438 | debug("Next authentication method: %s", name); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1439 | return current; |
| 1440 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1441 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1442 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1443 | |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 1444 | static char * |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1445 | authmethods_get(void) |
| 1446 | { |
| 1447 | Authmethod *method = NULL; |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1448 | Buffer b; |
| 1449 | char *list; |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1450 | |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1451 | buffer_init(&b); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1452 | for (method = authmethods; method->name != NULL; method++) { |
| 1453 | if (authmethod_is_enabled(method)) { |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1454 | if (buffer_len(&b) > 0) |
| 1455 | buffer_append(&b, ",", 1); |
| 1456 | buffer_append(&b, method->name, strlen(method->name)); |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1457 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1458 | } |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 1459 | buffer_append(&b, "\0", 1); |
| 1460 | list = xstrdup(buffer_ptr(&b)); |
| 1461 | buffer_free(&b); |
| 1462 | return list; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1463 | } |