Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 23 | */ |
| 24 | |
| 25 | #include "includes.h" |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame^] | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.89 2001/12/20 22:50:24 djm Exp $"); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 27 | |
| 28 | #include <openssl/bn.h> |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 29 | #include <openssl/md5.h> |
| 30 | #include <openssl/dh.h> |
| 31 | #include <openssl/hmac.h> |
| 32 | |
| 33 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 34 | #include "ssh2.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 35 | #include "xmalloc.h" |
| 36 | #include "rsa.h" |
| 37 | #include "buffer.h" |
| 38 | #include "packet.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 39 | #include "uidswap.h" |
| 40 | #include "compat.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 41 | #include "bufaux.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 42 | #include "cipher.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 43 | #include "kex.h" |
| 44 | #include "myproposal.h" |
| 45 | #include "key.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 46 | #include "sshconnect.h" |
| 47 | #include "authfile.h" |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 48 | #include "dh.h" |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 49 | #include "authfd.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 50 | #include "log.h" |
| 51 | #include "readconf.h" |
| 52 | #include "readpass.h" |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 53 | #include "match.h" |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 54 | #include "dispatch.h" |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 55 | #include "canohost.h" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 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; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 67 | int session_id2_len = 0; |
| 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) { |
| 91 | log("No valid ciphers for protocol version 2 given, using defaults."); |
| 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] = |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 104 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib"; |
| 105 | } else { |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 106 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 107 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; |
| 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 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 117 | /* start key exchange */ |
Ben Lindstrom | 238abf6 | 2001-04-04 17:52:53 +0000 | [diff] [blame] | 118 | kex = kex_setup(myproposal); |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 119 | kex->client_version_string=client_version_string; |
| 120 | kex->server_version_string=server_version_string; |
Ben Lindstrom | d6481ea | 2001-06-25 04:37:41 +0000 | [diff] [blame] | 121 | kex->verify_host_key=&verify_host_key_callback; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 122 | |
Ben Lindstrom | f28f634 | 2001-04-04 02:03:04 +0000 | [diff] [blame] | 123 | xxx_kex = kex; |
| 124 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 125 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 126 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 127 | session_id2 = kex->session_id; |
| 128 | session_id2_len = kex->session_id_len; |
| 129 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 130 | #ifdef DEBUG_KEXDH |
| 131 | /* send 1st encrypted/maced/compressed message */ |
| 132 | packet_start(SSH2_MSG_IGNORE); |
| 133 | packet_put_cstring("markus"); |
| 134 | packet_send(); |
| 135 | packet_write_wait(); |
| 136 | #endif |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 137 | debug("done: ssh_kex2."); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 138 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 139 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 140 | /* |
| 141 | * Authenticate user |
| 142 | */ |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 143 | |
| 144 | typedef struct Authctxt Authctxt; |
| 145 | typedef struct Authmethod Authmethod; |
| 146 | |
| 147 | typedef int sign_cb_fn( |
| 148 | Authctxt *authctxt, Key *key, |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 149 | u_char **sigp, int *lenp, u_char *data, int datalen); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 150 | |
| 151 | struct Authctxt { |
| 152 | const char *server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 153 | const char *local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 154 | const char *host; |
| 155 | const char *service; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 156 | Authmethod *method; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 157 | int success; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 158 | char *authlist; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 159 | /* pubkey */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 160 | Key *last_key; |
| 161 | sign_cb_fn *last_key_sign; |
| 162 | int last_key_hint; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 163 | AuthenticationConnection *agent; |
| 164 | /* hostbased */ |
| 165 | Key **keys; |
| 166 | int nkeys; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 167 | /* kbd-interactive */ |
| 168 | int info_req_seen; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 169 | }; |
| 170 | struct Authmethod { |
| 171 | char *name; /* string to compare against server's list */ |
| 172 | int (*userauth)(Authctxt *authctxt); |
| 173 | int *enabled; /* flag in option struct that enables method */ |
| 174 | int *batch_flag; /* flag in option struct that disables method */ |
| 175 | }; |
| 176 | |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame^] | 177 | void input_userauth_success(int, int, u_int32_t, void *); |
| 178 | void input_userauth_failure(int, int, u_int32_t, void *); |
| 179 | void input_userauth_banner(int, int, u_int32_t, void *); |
| 180 | void input_userauth_error(int, int, u_int32_t, void *); |
| 181 | void input_userauth_info_req(int, int, u_int32_t, void *); |
| 182 | void input_userauth_pk_ok(int, int, u_int32_t, void *); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 183 | |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 184 | int userauth_none(Authctxt *); |
| 185 | int userauth_pubkey(Authctxt *); |
| 186 | int userauth_passwd(Authctxt *); |
| 187 | int userauth_kbdint(Authctxt *); |
| 188 | int userauth_hostbased(Authctxt *); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 189 | |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 190 | void userauth(Authctxt *, char *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 191 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 192 | static int sign_and_send_pubkey(Authctxt *, Key *, sign_cb_fn *); |
| 193 | static void clear_auth_state(Authctxt *); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 194 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 195 | static Authmethod *authmethod_get(char *authlist); |
| 196 | static Authmethod *authmethod_lookup(const char *name); |
| 197 | static char *authmethods_get(void); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 198 | |
| 199 | Authmethod authmethods[] = { |
Ben Lindstrom | 1bfe291 | 2001-06-05 19:37:25 +0000 | [diff] [blame] | 200 | {"hostbased", |
| 201 | userauth_hostbased, |
| 202 | &options.hostbased_authentication, |
| 203 | NULL}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 204 | {"publickey", |
| 205 | userauth_pubkey, |
| 206 | &options.pubkey_authentication, |
| 207 | NULL}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 208 | {"keyboard-interactive", |
| 209 | userauth_kbdint, |
| 210 | &options.kbd_interactive_authentication, |
| 211 | &options.batch_mode}, |
Ben Lindstrom | 45350e8 | 2001-08-06 20:57:11 +0000 | [diff] [blame] | 212 | {"password", |
| 213 | userauth_passwd, |
| 214 | &options.password_authentication, |
| 215 | &options.batch_mode}, |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 216 | {"none", |
| 217 | userauth_none, |
| 218 | NULL, |
| 219 | NULL}, |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 220 | {NULL, NULL, NULL, NULL} |
| 221 | }; |
| 222 | |
| 223 | void |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 224 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
| 225 | Key **keys, int nkeys) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 226 | { |
| 227 | Authctxt authctxt; |
| 228 | int type; |
| 229 | int plen; |
| 230 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 231 | if (options.challenge_response_authentication) |
Ben Lindstrom | 95fb2dd | 2001-01-23 03:12:10 +0000 | [diff] [blame] | 232 | options.kbd_interactive_authentication = 1; |
| 233 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 234 | debug("send SSH2_MSG_SERVICE_REQUEST"); |
| 235 | packet_start(SSH2_MSG_SERVICE_REQUEST); |
| 236 | packet_put_cstring("ssh-userauth"); |
| 237 | packet_send(); |
| 238 | packet_write_wait(); |
| 239 | type = packet_read(&plen); |
| 240 | if (type != SSH2_MSG_SERVICE_ACCEPT) { |
| 241 | fatal("denied SSH2_MSG_SERVICE_ACCEPT: %d", type); |
| 242 | } |
| 243 | if (packet_remaining() > 0) { |
| 244 | char *reply = packet_get_string(&plen); |
| 245 | debug("service_accept: %s", reply); |
| 246 | xfree(reply); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 247 | } else { |
| 248 | debug("buggy server: service_accept w/o service"); |
| 249 | } |
| 250 | packet_done(); |
| 251 | debug("got SSH2_MSG_SERVICE_ACCEPT"); |
| 252 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 253 | if (options.preferred_authentications == NULL) |
| 254 | options.preferred_authentications = authmethods_get(); |
| 255 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 256 | /* setup authentication context */ |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 257 | memset(&authctxt, 0, sizeof(authctxt)); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 258 | authctxt.agent = ssh_get_authentication_connection(); |
| 259 | authctxt.server_user = server_user; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 260 | authctxt.local_user = local_user; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 261 | authctxt.host = host; |
| 262 | authctxt.service = "ssh-connection"; /* service name */ |
| 263 | authctxt.success = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 264 | authctxt.method = authmethod_lookup("none"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 265 | authctxt.authlist = NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 266 | authctxt.keys = keys; |
| 267 | authctxt.nkeys = nkeys; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 268 | authctxt.info_req_seen = 0; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 269 | if (authctxt.method == NULL) |
| 270 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 271 | |
| 272 | /* initial userauth request */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 273 | userauth_none(&authctxt); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 274 | |
Ben Lindstrom | 8ac9106 | 2001-04-04 17:57:54 +0000 | [diff] [blame] | 275 | dispatch_init(&input_userauth_error); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 276 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
| 277 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 278 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 279 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
| 280 | |
| 281 | if (authctxt.agent != NULL) |
| 282 | ssh_close_authentication_connection(authctxt.agent); |
| 283 | |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 284 | debug("ssh-userauth2 successful: method %s", authctxt.method->name); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 285 | } |
| 286 | void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 287 | userauth(Authctxt *authctxt, char *authlist) |
| 288 | { |
| 289 | if (authlist == NULL) { |
| 290 | authlist = authctxt->authlist; |
| 291 | } else { |
| 292 | if (authctxt->authlist) |
| 293 | xfree(authctxt->authlist); |
| 294 | authctxt->authlist = authlist; |
| 295 | } |
| 296 | for (;;) { |
| 297 | Authmethod *method = authmethod_get(authlist); |
| 298 | if (method == NULL) |
| 299 | fatal("Permission denied (%s).", authlist); |
| 300 | authctxt->method = method; |
| 301 | if (method->userauth(authctxt) != 0) { |
| 302 | debug2("we sent a %s packet, wait for reply", method->name); |
| 303 | break; |
| 304 | } else { |
| 305 | debug2("we did not send a packet, disable method"); |
| 306 | method->enabled = NULL; |
| 307 | } |
| 308 | } |
| 309 | } |
| 310 | void |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame^] | 311 | input_userauth_error(int type, int plen, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 312 | { |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 313 | fatal("input_userauth_error: bad message during authentication: " |
| 314 | "type %d", type); |
| 315 | } |
| 316 | void |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame^] | 317 | input_userauth_banner(int type, int plen, u_int32_t seq, void *ctxt) |
Ben Lindstrom | d26dcf3 | 2001-01-06 15:18:16 +0000 | [diff] [blame] | 318 | { |
| 319 | char *msg, *lang; |
| 320 | debug3("input_userauth_banner"); |
| 321 | msg = packet_get_string(NULL); |
| 322 | lang = packet_get_string(NULL); |
| 323 | fprintf(stderr, "%s", msg); |
| 324 | xfree(msg); |
| 325 | xfree(lang); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 326 | } |
| 327 | void |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame^] | 328 | input_userauth_success(int type, int plen, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 329 | { |
| 330 | Authctxt *authctxt = ctxt; |
| 331 | if (authctxt == NULL) |
| 332 | fatal("input_userauth_success: no authentication context"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 333 | if (authctxt->authlist) |
| 334 | xfree(authctxt->authlist); |
| 335 | clear_auth_state(authctxt); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 336 | authctxt->success = 1; /* break out */ |
| 337 | } |
| 338 | void |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame^] | 339 | input_userauth_failure(int type, int plen, u_int32_t seq, void *ctxt) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 340 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 341 | Authctxt *authctxt = ctxt; |
| 342 | char *authlist = NULL; |
| 343 | int partial; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 344 | |
| 345 | if (authctxt == NULL) |
| 346 | fatal("input_userauth_failure: no authentication context"); |
| 347 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 348 | authlist = packet_get_string(NULL); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 349 | partial = packet_get_char(); |
| 350 | packet_done(); |
| 351 | |
| 352 | if (partial != 0) |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 353 | log("Authenticated with partial success."); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 354 | debug("authentications that can continue: %s", authlist); |
| 355 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 356 | clear_auth_state(authctxt); |
| 357 | userauth(authctxt, authlist); |
| 358 | } |
| 359 | void |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame^] | 360 | input_userauth_pk_ok(int type, int plen, u_int32_t seq, void *ctxt) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 361 | { |
| 362 | Authctxt *authctxt = ctxt; |
| 363 | Key *key = NULL; |
| 364 | Buffer b; |
Ben Lindstrom | 206941f | 2001-04-15 14:27:16 +0000 | [diff] [blame] | 365 | int alen, blen, sent = 0; |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 366 | char *pkalg, *pkblob, *fp; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 367 | |
| 368 | if (authctxt == NULL) |
| 369 | fatal("input_userauth_pk_ok: no authentication context"); |
| 370 | if (datafellows & SSH_BUG_PKOK) { |
| 371 | /* this is similar to SSH_BUG_PKAUTH */ |
| 372 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); |
| 373 | pkblob = packet_get_string(&blen); |
| 374 | buffer_init(&b); |
| 375 | buffer_append(&b, pkblob, blen); |
| 376 | pkalg = buffer_get_string(&b, &alen); |
| 377 | buffer_free(&b); |
| 378 | } else { |
| 379 | pkalg = packet_get_string(&alen); |
| 380 | pkblob = packet_get_string(&blen); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 381 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 382 | packet_done(); |
| 383 | |
| 384 | debug("input_userauth_pk_ok: pkalg %s blen %d lastkey %p hint %d", |
| 385 | pkalg, blen, authctxt->last_key, authctxt->last_key_hint); |
| 386 | |
| 387 | do { |
| 388 | if (authctxt->last_key == NULL || |
| 389 | authctxt->last_key_sign == NULL) { |
| 390 | debug("no last key or no sign cb"); |
| 391 | break; |
| 392 | } |
Ben Lindstrom | 206941f | 2001-04-15 14:27:16 +0000 | [diff] [blame] | 393 | if (key_type_from_name(pkalg) == KEY_UNSPEC) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 394 | debug("unknown pkalg %s", pkalg); |
| 395 | break; |
| 396 | } |
| 397 | if ((key = key_from_blob(pkblob, blen)) == NULL) { |
| 398 | debug("no key from blob. pkalg %s", pkalg); |
| 399 | break; |
| 400 | } |
Ben Lindstrom | cfccef9 | 2001-03-13 04:57:58 +0000 | [diff] [blame] | 401 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); |
| 402 | debug2("input_userauth_pk_ok: fp %s", fp); |
| 403 | xfree(fp); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 404 | if (!key_equal(key, authctxt->last_key)) { |
| 405 | debug("key != last_key"); |
| 406 | break; |
| 407 | } |
| 408 | sent = sign_and_send_pubkey(authctxt, key, |
| 409 | authctxt->last_key_sign); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 410 | } while (0); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 411 | |
| 412 | if (key != NULL) |
| 413 | key_free(key); |
| 414 | xfree(pkalg); |
| 415 | xfree(pkblob); |
| 416 | |
| 417 | /* unregister */ |
| 418 | clear_auth_state(authctxt); |
| 419 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, NULL); |
| 420 | |
| 421 | /* try another method if we did not send a packet*/ |
| 422 | if (sent == 0) |
| 423 | userauth(authctxt, NULL); |
| 424 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 425 | } |
| 426 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 427 | int |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 428 | userauth_none(Authctxt *authctxt) |
| 429 | { |
| 430 | /* initial userauth request */ |
| 431 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 432 | packet_put_cstring(authctxt->server_user); |
| 433 | packet_put_cstring(authctxt->service); |
| 434 | packet_put_cstring(authctxt->method->name); |
| 435 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 436 | return 1; |
| 437 | } |
| 438 | |
| 439 | int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 440 | userauth_passwd(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 441 | { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 442 | static int attempt = 0; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 443 | char prompt[80]; |
| 444 | char *password; |
| 445 | |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 446 | if (attempt++ >= options.number_of_password_prompts) |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 447 | return 0; |
| 448 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 449 | if (attempt != 1) |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 450 | error("Permission denied, please try again."); |
| 451 | |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 452 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 453 | authctxt->server_user, authctxt->host); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 454 | password = read_passphrase(prompt, 0); |
| 455 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 456 | packet_put_cstring(authctxt->server_user); |
| 457 | packet_put_cstring(authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 458 | packet_put_cstring(authctxt->method->name); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 459 | packet_put_char(0); |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 460 | packet_put_cstring(password); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 461 | memset(password, 0, strlen(password)); |
| 462 | xfree(password); |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 463 | packet_add_padding(64); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 464 | packet_send(); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 465 | return 1; |
| 466 | } |
| 467 | |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 468 | static void |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 469 | clear_auth_state(Authctxt *authctxt) |
| 470 | { |
| 471 | /* XXX clear authentication state */ |
| 472 | if (authctxt->last_key != NULL && authctxt->last_key_hint == -1) { |
| 473 | debug3("clear_auth_state: key_free %p", authctxt->last_key); |
| 474 | key_free(authctxt->last_key); |
| 475 | } |
| 476 | authctxt->last_key = NULL; |
| 477 | authctxt->last_key_hint = -2; |
| 478 | authctxt->last_key_sign = NULL; |
| 479 | } |
| 480 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 481 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 482 | sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 483 | { |
| 484 | Buffer b; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 485 | u_char *blob, *signature; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 486 | int bloblen, slen; |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 487 | int skip = 0; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 488 | int ret = -1; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 489 | int have_sig = 1; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 490 | |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 491 | debug3("sign_and_send_pubkey"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 492 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 493 | if (key_to_blob(k, &blob, &bloblen) == 0) { |
| 494 | /* we cannot handle this key */ |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 495 | debug3("sign_and_send_pubkey: cannot handle key"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 496 | return 0; |
| 497 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 498 | /* data to be signed */ |
| 499 | buffer_init(&b); |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 500 | if (datafellows & SSH_OLD_SESSIONID) { |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 501 | buffer_append(&b, session_id2, session_id2_len); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 502 | skip = session_id2_len; |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 503 | } else { |
| 504 | buffer_put_string(&b, session_id2, session_id2_len); |
| 505 | skip = buffer_len(&b); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 506 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 507 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 508 | buffer_put_cstring(&b, authctxt->server_user); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 509 | buffer_put_cstring(&b, |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 510 | datafellows & SSH_BUG_PKSERVICE ? |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 511 | "ssh-userauth" : |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 512 | authctxt->service); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 513 | if (datafellows & SSH_BUG_PKAUTH) { |
| 514 | buffer_put_char(&b, have_sig); |
| 515 | } else { |
| 516 | buffer_put_cstring(&b, authctxt->method->name); |
| 517 | buffer_put_char(&b, have_sig); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 518 | buffer_put_cstring(&b, key_ssh_name(k)); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 519 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 520 | buffer_put_string(&b, blob, bloblen); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 521 | |
| 522 | /* generate signature */ |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 523 | ret = (*sign_callback)(authctxt, k, &signature, &slen, |
| 524 | buffer_ptr(&b), buffer_len(&b)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 525 | if (ret == -1) { |
| 526 | xfree(blob); |
| 527 | buffer_free(&b); |
| 528 | return 0; |
| 529 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 530 | #ifdef DEBUG_PK |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 531 | buffer_dump(&b); |
| 532 | #endif |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 533 | if (datafellows & SSH_BUG_PKSERVICE) { |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 534 | buffer_clear(&b); |
| 535 | buffer_append(&b, session_id2, session_id2_len); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 536 | skip = session_id2_len; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 537 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 538 | buffer_put_cstring(&b, authctxt->server_user); |
| 539 | buffer_put_cstring(&b, authctxt->service); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 540 | buffer_put_cstring(&b, authctxt->method->name); |
| 541 | buffer_put_char(&b, have_sig); |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 542 | if (!(datafellows & SSH_BUG_PKAUTH)) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 543 | buffer_put_cstring(&b, key_ssh_name(k)); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 544 | buffer_put_string(&b, blob, bloblen); |
| 545 | } |
| 546 | xfree(blob); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 547 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 548 | /* append signature */ |
| 549 | buffer_put_string(&b, signature, slen); |
| 550 | xfree(signature); |
| 551 | |
| 552 | /* skip session id and packet type */ |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 553 | if (buffer_len(&b) < skip + 1) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 554 | fatal("userauth_pubkey: internal error"); |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 555 | buffer_consume(&b, skip + 1); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 556 | |
| 557 | /* put remaining data from buffer into packet */ |
| 558 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 559 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); |
| 560 | buffer_free(&b); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 561 | packet_send(); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 562 | |
| 563 | return 1; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 564 | } |
| 565 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 566 | static int |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 567 | send_pubkey_test(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback, |
| 568 | int hint) |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 569 | { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 570 | u_char *blob; |
| 571 | int bloblen, have_sig = 0; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 572 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 573 | debug3("send_pubkey_test"); |
| 574 | |
| 575 | if (key_to_blob(k, &blob, &bloblen) == 0) { |
| 576 | /* we cannot handle this key */ |
| 577 | debug3("send_pubkey_test: cannot handle key"); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 578 | return 0; |
| 579 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 580 | /* register callback for USERAUTH_PK_OK message */ |
| 581 | authctxt->last_key_sign = sign_callback; |
| 582 | authctxt->last_key_hint = hint; |
| 583 | authctxt->last_key = k; |
| 584 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 585 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 586 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 587 | packet_put_cstring(authctxt->server_user); |
| 588 | packet_put_cstring(authctxt->service); |
| 589 | packet_put_cstring(authctxt->method->name); |
| 590 | packet_put_char(have_sig); |
| 591 | if (!(datafellows & SSH_BUG_PKAUTH)) |
| 592 | packet_put_cstring(key_ssh_name(k)); |
| 593 | packet_put_string(blob, bloblen); |
| 594 | xfree(blob); |
| 595 | packet_send(); |
| 596 | return 1; |
| 597 | } |
| 598 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 599 | static Key * |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 600 | load_identity_file(char *filename) |
| 601 | { |
| 602 | Key *private; |
| 603 | char prompt[300], *passphrase; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 604 | int quit, i; |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 605 | struct stat st; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 606 | |
Ben Lindstrom | 329782e | 2001-03-10 17:08:59 +0000 | [diff] [blame] | 607 | if (stat(filename, &st) < 0) { |
| 608 | debug3("no such identity: %s", filename); |
| 609 | return NULL; |
| 610 | } |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 611 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL); |
| 612 | if (private == NULL) { |
| 613 | if (options.batch_mode) |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 614 | return NULL; |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 615 | snprintf(prompt, sizeof prompt, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 616 | "Enter passphrase for key '%.100s': ", filename); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 617 | for (i = 0; i < options.number_of_password_prompts; i++) { |
| 618 | passphrase = read_passphrase(prompt, 0); |
| 619 | if (strcmp(passphrase, "") != 0) { |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 620 | private = key_load_private_type(KEY_UNSPEC, filename, |
| 621 | passphrase, NULL); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 622 | quit = 0; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 623 | } else { |
| 624 | debug2("no passphrase given, try next key"); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 625 | quit = 1; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 626 | } |
| 627 | memset(passphrase, 0, strlen(passphrase)); |
| 628 | xfree(passphrase); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 629 | if (private != NULL || quit) |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 630 | break; |
| 631 | debug2("bad passphrase given, try again..."); |
| 632 | } |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 633 | } |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 634 | return private; |
| 635 | } |
| 636 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 637 | static int |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 638 | identity_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
| 639 | u_char *data, int datalen) |
| 640 | { |
| 641 | Key *private; |
| 642 | int idx, ret; |
| 643 | |
| 644 | idx = authctxt->last_key_hint; |
| 645 | if (idx < 0) |
| 646 | return -1; |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 647 | |
| 648 | /* private key is stored in external hardware */ |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 649 | if (options.identity_keys[idx]->flags & KEY_FLAG_EXT) |
Ben Lindstrom | c5b6800 | 2001-07-04 04:52:03 +0000 | [diff] [blame] | 650 | return key_sign(options.identity_keys[idx], sigp, lenp, data, datalen); |
| 651 | |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 652 | private = load_identity_file(options.identity_files[idx]); |
| 653 | if (private == NULL) |
| 654 | return -1; |
| 655 | ret = key_sign(private, sigp, lenp, data, datalen); |
| 656 | key_free(private); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 657 | return ret; |
| 658 | } |
| 659 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 660 | static int |
| 661 | agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 662 | u_char *data, int datalen) |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 663 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 664 | return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 665 | } |
| 666 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 667 | static int |
| 668 | key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 669 | u_char *data, int datalen) |
| 670 | { |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 671 | return key_sign(key, sigp, lenp, data, datalen); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 672 | } |
| 673 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 674 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 675 | userauth_pubkey_agent(Authctxt *authctxt) |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 676 | { |
| 677 | static int called = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 678 | int ret = 0; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 679 | char *comment; |
| 680 | Key *k; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 681 | |
| 682 | if (called == 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 683 | if (ssh_get_num_identities(authctxt->agent, 2) == 0) |
| 684 | debug2("userauth_pubkey_agent: no keys at all"); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 685 | called = 1; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 686 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 687 | k = ssh_get_next_identity(authctxt->agent, &comment, 2); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 688 | if (k == NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 689 | debug2("userauth_pubkey_agent: no more keys"); |
| 690 | } else { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 691 | debug("userauth_pubkey_agent: testing agent key %s", comment); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 692 | xfree(comment); |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 693 | ret = send_pubkey_test(authctxt, k, agent_sign_cb, -1); |
| 694 | if (ret == 0) |
| 695 | key_free(k); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 696 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 697 | if (ret == 0) |
| 698 | debug2("userauth_pubkey_agent: no message sent"); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 699 | return ret; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 700 | } |
| 701 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 702 | int |
| 703 | userauth_pubkey(Authctxt *authctxt) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 704 | { |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 705 | static int idx = 0; |
| 706 | int sent = 0; |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 707 | Key *key; |
| 708 | char *filename; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 709 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 710 | if (authctxt->agent != NULL) { |
| 711 | do { |
| 712 | sent = userauth_pubkey_agent(authctxt); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 713 | } while (!sent && authctxt->agent->howmany > 0); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 714 | } |
| 715 | while (!sent && idx < options.num_identity_files) { |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 716 | key = options.identity_keys[idx]; |
| 717 | filename = options.identity_files[idx]; |
| 718 | if (key == NULL) { |
| 719 | debug("try privkey: %s", filename); |
| 720 | key = load_identity_file(filename); |
| 721 | if (key != NULL) { |
| 722 | sent = sign_and_send_pubkey(authctxt, key, |
| 723 | key_sign_cb); |
| 724 | key_free(key); |
| 725 | } |
| 726 | } else if (key->type != KEY_RSA1) { |
| 727 | debug("try pubkey: %s", filename); |
| 728 | sent = send_pubkey_test(authctxt, key, |
| 729 | identity_sign_cb, idx); |
| 730 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 731 | idx++; |
| 732 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 733 | return sent; |
| 734 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 735 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 736 | /* |
| 737 | * Send userauth request message specifying keyboard-interactive method. |
| 738 | */ |
| 739 | int |
| 740 | userauth_kbdint(Authctxt *authctxt) |
| 741 | { |
| 742 | static int attempt = 0; |
| 743 | |
| 744 | if (attempt++ >= options.number_of_password_prompts) |
| 745 | return 0; |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 746 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
| 747 | if (attempt > 1 && !authctxt->info_req_seen) { |
| 748 | debug3("userauth_kbdint: disable: no info_req_seen"); |
| 749 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); |
| 750 | return 0; |
| 751 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 752 | |
| 753 | debug2("userauth_kbdint"); |
| 754 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 755 | packet_put_cstring(authctxt->server_user); |
| 756 | packet_put_cstring(authctxt->service); |
| 757 | packet_put_cstring(authctxt->method->name); |
| 758 | packet_put_cstring(""); /* lang */ |
| 759 | packet_put_cstring(options.kbd_interactive_devices ? |
| 760 | options.kbd_interactive_devices : ""); |
| 761 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 762 | |
| 763 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); |
| 764 | return 1; |
| 765 | } |
| 766 | |
| 767 | /* |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 768 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 769 | */ |
| 770 | void |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame^] | 771 | input_userauth_info_req(int type, int plen, u_int32_t seq, void *ctxt) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 772 | { |
| 773 | Authctxt *authctxt = ctxt; |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 774 | char *name, *inst, *lang, *prompt, *response; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 775 | u_int num_prompts, i; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 776 | int echo = 0; |
| 777 | |
| 778 | debug2("input_userauth_info_req"); |
| 779 | |
| 780 | if (authctxt == NULL) |
| 781 | fatal("input_userauth_info_req: no authentication context"); |
| 782 | |
Ben Lindstrom | 7d19996 | 2001-09-12 18:29:00 +0000 | [diff] [blame] | 783 | authctxt->info_req_seen = 1; |
| 784 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 785 | name = packet_get_string(NULL); |
| 786 | inst = packet_get_string(NULL); |
| 787 | lang = packet_get_string(NULL); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 788 | if (strlen(name) > 0) |
Ben Lindstrom | 126c56a | 2001-06-25 05:22:53 +0000 | [diff] [blame] | 789 | log("%s", name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 790 | if (strlen(inst) > 0) |
Ben Lindstrom | 126c56a | 2001-06-25 05:22:53 +0000 | [diff] [blame] | 791 | log("%s", inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 792 | xfree(name); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 793 | xfree(inst); |
Ben Lindstrom | 03df5bd | 2001-02-10 22:16:41 +0000 | [diff] [blame] | 794 | xfree(lang); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 795 | |
| 796 | num_prompts = packet_get_int(); |
| 797 | /* |
| 798 | * Begin to build info response packet based on prompts requested. |
| 799 | * We commit to providing the correct number of responses, so if |
| 800 | * further on we run into a problem that prevents this, we have to |
| 801 | * be sure and clean this up and send a correct error response. |
| 802 | */ |
| 803 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); |
| 804 | packet_put_int(num_prompts); |
| 805 | |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 806 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 807 | for (i = 0; i < num_prompts; i++) { |
| 808 | prompt = packet_get_string(NULL); |
| 809 | echo = packet_get_char(); |
| 810 | |
Ben Lindstrom | 949974b | 2001-06-25 05:20:31 +0000 | [diff] [blame] | 811 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 812 | |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 813 | packet_put_cstring(response); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 814 | memset(response, 0, strlen(response)); |
| 815 | xfree(response); |
| 816 | xfree(prompt); |
| 817 | } |
| 818 | packet_done(); /* done with parsing incoming message. */ |
| 819 | |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 820 | packet_add_padding(64); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 821 | packet_send(); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 822 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 823 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 824 | /* |
| 825 | * this will be move to an external program (ssh-keysign) ASAP. ssh-keysign |
| 826 | * will be setuid-root and the sbit can be removed from /usr/bin/ssh. |
| 827 | */ |
| 828 | int |
| 829 | userauth_hostbased(Authctxt *authctxt) |
| 830 | { |
| 831 | Key *private = NULL; |
| 832 | Buffer b; |
| 833 | u_char *signature, *blob; |
| 834 | char *chost, *pkalg, *p; |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 835 | const char *service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 836 | u_int blen, slen; |
Ben Lindstrom | 2bffd6f | 2001-04-19 20:35:40 +0000 | [diff] [blame] | 837 | int ok, i, len, found = 0; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 838 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 839 | /* check for a useful key */ |
| 840 | for (i = 0; i < authctxt->nkeys; i++) { |
| 841 | private = authctxt->keys[i]; |
| 842 | if (private && private->type != KEY_RSA1) { |
| 843 | found = 1; |
| 844 | /* we take and free the key */ |
| 845 | authctxt->keys[i] = NULL; |
| 846 | break; |
| 847 | } |
| 848 | } |
| 849 | if (!found) { |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 850 | debug("userauth_hostbased: no more client hostkeys"); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 851 | return 0; |
| 852 | } |
| 853 | if (key_to_blob(private, &blob, &blen) == 0) { |
| 854 | key_free(private); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 855 | return 0; |
| 856 | } |
Damien Miller | 91c1847 | 2001-11-12 11:02:03 +1100 | [diff] [blame] | 857 | /* figure out a name for the client host */ |
| 858 | p = get_local_name(packet_get_connection_in()); |
| 859 | if (p == NULL) { |
| 860 | error("userauth_hostbased: cannot get local ipaddr/name"); |
| 861 | key_free(private); |
| 862 | return 0; |
| 863 | } |
| 864 | len = strlen(p) + 2; |
| 865 | chost = xmalloc(len); |
| 866 | strlcpy(chost, p, len); |
| 867 | strlcat(chost, ".", len); |
| 868 | debug2("userauth_hostbased: chost %s", chost); |
| 869 | |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 870 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
| 871 | authctxt->service; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 872 | pkalg = xstrdup(key_ssh_name(private)); |
| 873 | buffer_init(&b); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 874 | /* construct data */ |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 875 | buffer_put_string(&b, session_id2, session_id2_len); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 876 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
| 877 | buffer_put_cstring(&b, authctxt->server_user); |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 878 | buffer_put_cstring(&b, service); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 879 | buffer_put_cstring(&b, authctxt->method->name); |
| 880 | buffer_put_cstring(&b, pkalg); |
| 881 | buffer_put_string(&b, blob, blen); |
| 882 | buffer_put_cstring(&b, chost); |
| 883 | buffer_put_cstring(&b, authctxt->local_user); |
| 884 | #ifdef DEBUG_PK |
| 885 | buffer_dump(&b); |
| 886 | #endif |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 887 | ok = key_sign(private, &signature, &slen, buffer_ptr(&b), buffer_len(&b)); |
| 888 | key_free(private); |
| 889 | buffer_free(&b); |
| 890 | if (ok != 0) { |
| 891 | error("key_sign failed"); |
| 892 | xfree(chost); |
| 893 | xfree(pkalg); |
| 894 | return 0; |
| 895 | } |
| 896 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
| 897 | packet_put_cstring(authctxt->server_user); |
| 898 | packet_put_cstring(authctxt->service); |
| 899 | packet_put_cstring(authctxt->method->name); |
| 900 | packet_put_cstring(pkalg); |
| 901 | packet_put_string(blob, blen); |
| 902 | packet_put_cstring(chost); |
| 903 | packet_put_cstring(authctxt->local_user); |
| 904 | packet_put_string(signature, slen); |
| 905 | memset(signature, 's', slen); |
| 906 | xfree(signature); |
| 907 | xfree(chost); |
| 908 | xfree(pkalg); |
| 909 | |
| 910 | packet_send(); |
| 911 | return 1; |
| 912 | } |
| 913 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 914 | /* find auth method */ |
| 915 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 916 | /* |
| 917 | * given auth method name, if configurable options permit this method fill |
| 918 | * in auth_ident field and return true, otherwise return false. |
| 919 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 920 | static int |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 921 | authmethod_is_enabled(Authmethod *method) |
| 922 | { |
| 923 | if (method == NULL) |
| 924 | return 0; |
| 925 | /* return false if options indicate this method is disabled */ |
| 926 | if (method->enabled == NULL || *method->enabled == 0) |
| 927 | return 0; |
| 928 | /* return false if batch mode is enabled but method needs interactive mode */ |
| 929 | if (method->batch_flag != NULL && *method->batch_flag != 0) |
| 930 | return 0; |
| 931 | return 1; |
| 932 | } |
| 933 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 934 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 935 | authmethod_lookup(const char *name) |
| 936 | { |
| 937 | Authmethod *method = NULL; |
| 938 | if (name != NULL) |
| 939 | for (method = authmethods; method->name != NULL; method++) |
| 940 | if (strcmp(name, method->name) == 0) |
| 941 | return method; |
| 942 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); |
| 943 | return NULL; |
| 944 | } |
| 945 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 946 | /* XXX internal state */ |
| 947 | static Authmethod *current = NULL; |
| 948 | static char *supported = NULL; |
| 949 | static char *preferred = NULL; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 950 | /* |
| 951 | * Given the authentication method list sent by the server, return the |
| 952 | * 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] | 953 | * use a built-in default list. |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 954 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 955 | static Authmethod * |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 956 | authmethod_get(char *authlist) |
| 957 | { |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 958 | |
| 959 | char *name = NULL; |
| 960 | int next; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 961 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 962 | /* Use a suitable default if we're passed a nil list. */ |
| 963 | if (authlist == NULL || strlen(authlist) == 0) |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 964 | authlist = options.preferred_authentications; |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 965 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 966 | if (supported == NULL || strcmp(authlist, supported) != 0) { |
| 967 | debug3("start over, passed a different list %s", authlist); |
| 968 | if (supported != NULL) |
| 969 | xfree(supported); |
| 970 | supported = xstrdup(authlist); |
| 971 | preferred = options.preferred_authentications; |
| 972 | debug3("preferred %s", preferred); |
| 973 | current = NULL; |
| 974 | } else if (current != NULL && authmethod_is_enabled(current)) |
| 975 | return current; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 976 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 977 | for (;;) { |
| 978 | if ((name = match_list(preferred, supported, &next)) == NULL) { |
| 979 | debug("no more auth methods to try"); |
| 980 | current = NULL; |
| 981 | return NULL; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 982 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 983 | preferred += next; |
| 984 | debug3("authmethod_lookup %s", name); |
| 985 | debug3("remaining preferred: %s", preferred); |
| 986 | if ((current = authmethod_lookup(name)) != NULL && |
| 987 | authmethod_is_enabled(current)) { |
| 988 | debug3("authmethod_is_enabled %s", name); |
| 989 | debug("next auth method to try is %s", name); |
| 990 | return current; |
| 991 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 992 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 993 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 994 | |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 995 | |
| 996 | #define DELIM "," |
Ben Lindstrom | 7907382 | 2001-07-04 03:42:30 +0000 | [diff] [blame] | 997 | |
| 998 | static char * |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 999 | authmethods_get(void) |
| 1000 | { |
| 1001 | Authmethod *method = NULL; |
| 1002 | char buf[1024]; |
| 1003 | |
| 1004 | buf[0] = '\0'; |
| 1005 | for (method = authmethods; method->name != NULL; method++) { |
| 1006 | if (authmethod_is_enabled(method)) { |
| 1007 | if (buf[0] != '\0') |
| 1008 | strlcat(buf, DELIM, sizeof buf); |
| 1009 | strlcat(buf, method->name, sizeof buf); |
| 1010 | } |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1011 | } |
Ben Lindstrom | b9be60a | 2001-03-11 01:49:19 +0000 | [diff] [blame] | 1012 | return xstrdup(buf); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 1013 | } |