Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * Functions for connecting the local authentication agent. |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 6 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 7 | * As far as I am concerned, the code I have written for this software |
| 8 | * can be used freely for any purpose. Any derived versions of this |
| 9 | * software must be clearly marked as such, and if the derived work is |
| 10 | * incompatible with the protocol description in the RFC file, it must be |
| 11 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 12 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 13 | * SSH2 implementation, |
| 14 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or without |
| 17 | * modification, are permitted provided that the following conditions |
| 18 | * are met: |
| 19 | * 1. Redistributions of source code must retain the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer. |
| 21 | * 2. Redistributions in binary form must reproduce the above copyright |
| 22 | * notice, this list of conditions and the following disclaimer in the |
| 23 | * documentation and/or other materials provided with the distribution. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 35 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 36 | |
| 37 | #include "includes.h" |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 38 | RCSID("$OpenBSD: authfd.c,v 1.27 2000/09/07 20:27:49 deraadt Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 39 | |
| 40 | #include "ssh.h" |
| 41 | #include "rsa.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 42 | #include "buffer.h" |
| 43 | #include "bufaux.h" |
| 44 | #include "xmalloc.h" |
| 45 | #include "getput.h" |
| 46 | |
| 47 | #include <openssl/rsa.h> |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 48 | #include <openssl/dsa.h> |
| 49 | #include <openssl/evp.h> |
| 50 | #include "key.h" |
| 51 | #include "authfd.h" |
| 52 | #include "kex.h" |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 53 | #include "dsa.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 54 | |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 55 | /* helper */ |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 56 | int decode_reply(int type); |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 57 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | /* Returns the number of the authentication fd, or -1 if there is none. */ |
| 59 | |
| 60 | int |
| 61 | ssh_get_authentication_socket() |
| 62 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 63 | const char *authsocket; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 64 | int sock, len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 65 | struct sockaddr_un sunaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 66 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 67 | authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME); |
| 68 | if (!authsocket) |
| 69 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 70 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 71 | sunaddr.sun_family = AF_UNIX; |
| 72 | strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path)); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 73 | #ifdef HAVE_SUN_LEN_IN_SOCKADDR_UN |
| 74 | sunaddr.sun_len = len = SUN_LEN(&sunaddr)+1; |
| 75 | #else /* HAVE_SUN_LEN_IN_SOCKADDR_UN */ |
| 76 | len = SUN_LEN(&sunaddr)+1; |
| 77 | #endif /* HAVE_SUN_LEN_IN_SOCKADDR_UN */ |
Damien Miller | 10f6f6b | 1999-11-17 17:29:08 +1100 | [diff] [blame] | 78 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 79 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 80 | if (sock < 0) |
| 81 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 82 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 83 | /* close on exec */ |
| 84 | if (fcntl(sock, F_SETFD, 1) == -1) { |
| 85 | close(sock); |
| 86 | return -1; |
| 87 | } |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 88 | if (connect(sock, (struct sockaddr *) & sunaddr, len) < 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 89 | close(sock); |
| 90 | return -1; |
| 91 | } |
| 92 | return sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 93 | } |
| 94 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 95 | int |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 96 | ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 97 | { |
| 98 | int l, len; |
| 99 | char buf[1024]; |
| 100 | |
| 101 | /* Get the length of the message, and format it in the buffer. */ |
| 102 | len = buffer_len(request); |
| 103 | PUT_32BIT(buf, len); |
| 104 | |
| 105 | /* Send the length and then the packet to the agent. */ |
| 106 | if (atomicio(write, auth->fd, buf, 4) != 4 || |
| 107 | atomicio(write, auth->fd, buffer_ptr(request), |
| 108 | buffer_len(request)) != buffer_len(request)) { |
| 109 | error("Error writing to authentication socket."); |
| 110 | return 0; |
| 111 | } |
| 112 | /* |
| 113 | * Wait for response from the agent. First read the length of the |
| 114 | * response packet. |
| 115 | */ |
| 116 | len = 4; |
| 117 | while (len > 0) { |
| 118 | l = read(auth->fd, buf + 4 - len, len); |
| 119 | if (l <= 0) { |
| 120 | error("Error reading response length from authentication socket."); |
| 121 | return 0; |
| 122 | } |
| 123 | len -= l; |
| 124 | } |
| 125 | |
| 126 | /* Extract the length, and check it for sanity. */ |
| 127 | len = GET_32BIT(buf); |
| 128 | if (len > 256 * 1024) |
| 129 | fatal("Authentication response too long: %d", len); |
| 130 | |
| 131 | /* Read the rest of the response in to the buffer. */ |
| 132 | buffer_clear(reply); |
| 133 | while (len > 0) { |
| 134 | l = len; |
| 135 | if (l > sizeof(buf)) |
| 136 | l = sizeof(buf); |
| 137 | l = read(auth->fd, buf, l); |
| 138 | if (l <= 0) { |
| 139 | error("Error reading response from authentication socket."); |
| 140 | return 0; |
| 141 | } |
| 142 | buffer_append(reply, (char *) buf, l); |
| 143 | len -= l; |
| 144 | } |
| 145 | return 1; |
| 146 | } |
| 147 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 148 | /* |
| 149 | * Closes the agent socket if it should be closed (depends on how it was |
| 150 | * obtained). The argument must have been returned by |
| 151 | * ssh_get_authentication_socket(). |
| 152 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 153 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 154 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 155 | ssh_close_authentication_socket(int sock) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 156 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 157 | if (getenv(SSH_AUTHSOCKET_ENV_NAME)) |
| 158 | close(sock); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 159 | } |
| 160 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 161 | /* |
| 162 | * Opens and connects a private socket for communication with the |
| 163 | * authentication agent. Returns the file descriptor (which must be |
| 164 | * shut down and closed by the caller when no longer needed). |
| 165 | * Returns NULL if an error occurred and the connection could not be |
| 166 | * opened. |
| 167 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 168 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 169 | AuthenticationConnection * |
| 170 | ssh_get_authentication_connection() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 171 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 172 | AuthenticationConnection *auth; |
| 173 | int sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 174 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 175 | sock = ssh_get_authentication_socket(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 176 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 177 | /* |
| 178 | * Fail if we couldn't obtain a connection. This happens if we |
| 179 | * exited due to a timeout. |
| 180 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 181 | if (sock < 0) |
| 182 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 183 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 184 | auth = xmalloc(sizeof(*auth)); |
| 185 | auth->fd = sock; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 186 | buffer_init(&auth->identities); |
| 187 | auth->howmany = 0; |
| 188 | |
| 189 | return auth; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 190 | } |
| 191 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 192 | /* |
| 193 | * Closes the connection to the authentication agent and frees any associated |
| 194 | * memory. |
| 195 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 196 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 197 | void |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 198 | ssh_close_authentication_connection(AuthenticationConnection *auth) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 199 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 200 | buffer_free(&auth->identities); |
| 201 | close(auth->fd); |
| 202 | xfree(auth); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 203 | } |
| 204 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 205 | /* |
| 206 | * Returns the first authentication identity held by the agent. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 207 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 208 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 209 | Key * |
| 210 | ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 211 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 212 | int type, code1 = 0, code2 = 0; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 213 | Buffer request; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 214 | |
| 215 | switch(version){ |
| 216 | case 1: |
| 217 | code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES; |
| 218 | code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER; |
| 219 | break; |
| 220 | case 2: |
| 221 | code1 = SSH2_AGENTC_REQUEST_IDENTITIES; |
| 222 | code2 = SSH2_AGENT_IDENTITIES_ANSWER; |
| 223 | break; |
| 224 | default: |
| 225 | return NULL; |
| 226 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 227 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 228 | /* |
| 229 | * Send a message to the agent requesting for a list of the |
| 230 | * identities it can represent. |
| 231 | */ |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 232 | buffer_init(&request); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 233 | buffer_put_char(&request, code1); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 234 | |
| 235 | buffer_clear(&auth->identities); |
| 236 | if (ssh_request_reply(auth, &request, &auth->identities) == 0) { |
| 237 | buffer_free(&request); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 238 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 239 | } |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 240 | buffer_free(&request); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 241 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 242 | /* Get message type, and verify that we got a proper answer. */ |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 243 | type = buffer_get_char(&auth->identities); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 244 | if (type == SSH_AGENT_FAILURE) { |
| 245 | return NULL; |
| 246 | } else if (type != code2) { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 247 | fatal("Bad authentication reply message type: %d", type); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 248 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 249 | |
| 250 | /* Get the number of entries in the response and check it for sanity. */ |
| 251 | auth->howmany = buffer_get_int(&auth->identities); |
| 252 | if (auth->howmany > 1024) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 253 | fatal("Too many identities in authentication reply: %d\n", |
| 254 | auth->howmany); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 255 | |
| 256 | /* Return the first entry (if any). */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 257 | return ssh_get_next_identity(auth, comment, version); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 258 | } |
| 259 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 260 | Key * |
| 261 | ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 262 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 263 | unsigned int bits; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 264 | unsigned char *blob; |
| 265 | unsigned int blen; |
| 266 | Key *key = NULL; |
Damien Miller | 7e8e820 | 1999-11-16 13:37:16 +1100 | [diff] [blame] | 267 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 268 | /* Return failure if no more entries. */ |
| 269 | if (auth->howmany <= 0) |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 270 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 271 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 272 | /* |
| 273 | * Get the next entry from the packet. These will abort with a fatal |
| 274 | * error if the packet is too short or contains corrupt data. |
| 275 | */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 276 | switch(version){ |
| 277 | case 1: |
| 278 | key = key_new(KEY_RSA); |
| 279 | bits = buffer_get_int(&auth->identities); |
| 280 | buffer_get_bignum(&auth->identities, key->rsa->e); |
| 281 | buffer_get_bignum(&auth->identities, key->rsa->n); |
| 282 | *comment = buffer_get_string(&auth->identities, NULL); |
| 283 | if (bits != BN_num_bits(key->rsa->n)) |
| 284 | log("Warning: identity keysize mismatch: actual %d, announced %u", |
| 285 | BN_num_bits(key->rsa->n), bits); |
| 286 | break; |
| 287 | case 2: |
| 288 | blob = buffer_get_string(&auth->identities, &blen); |
| 289 | *comment = buffer_get_string(&auth->identities, NULL); |
| 290 | key = dsa_key_from_blob(blob, blen); |
| 291 | xfree(blob); |
| 292 | break; |
| 293 | default: |
| 294 | return NULL; |
| 295 | break; |
| 296 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 297 | /* Decrement the number of remaining entries. */ |
| 298 | auth->howmany--; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 299 | return key; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 300 | } |
| 301 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 302 | /* |
| 303 | * Generates a random challenge, sends it to the agent, and waits for |
| 304 | * response from the agent. Returns true (non-zero) if the agent gave the |
| 305 | * correct answer, zero otherwise. Response type selects the style of |
| 306 | * response desired, with 0 corresponding to protocol version 1.0 (no longer |
| 307 | * supported) and 1 corresponding to protocol version 1.1. |
| 308 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 309 | |
| 310 | int |
| 311 | ssh_decrypt_challenge(AuthenticationConnection *auth, |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 312 | Key* key, BIGNUM *challenge, |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 313 | unsigned char session_id[16], |
| 314 | unsigned int response_type, |
| 315 | unsigned char response[16]) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 316 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 317 | Buffer buffer; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 318 | int success = 0; |
| 319 | int i; |
| 320 | int type; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 321 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 322 | if (key->type != KEY_RSA) |
| 323 | return 0; |
| 324 | if (response_type == 0) { |
| 325 | log("Compatibility with ssh protocol version 1.0 no longer supported."); |
| 326 | return 0; |
| 327 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 328 | buffer_init(&buffer); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 329 | buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 330 | buffer_put_int(&buffer, BN_num_bits(key->rsa->n)); |
| 331 | buffer_put_bignum(&buffer, key->rsa->e); |
| 332 | buffer_put_bignum(&buffer, key->rsa->n); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 333 | buffer_put_bignum(&buffer, challenge); |
| 334 | buffer_append(&buffer, (char *) session_id, 16); |
| 335 | buffer_put_int(&buffer, response_type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 336 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 337 | if (ssh_request_reply(auth, &buffer, &buffer) == 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 338 | buffer_free(&buffer); |
| 339 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 340 | } |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 341 | type = buffer_get_char(&buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 342 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 343 | if (type == SSH_AGENT_FAILURE) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 344 | log("Agent admitted failure to authenticate using the key."); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 345 | } else if (type != SSH_AGENT_RSA_RESPONSE) { |
| 346 | fatal("Bad authentication response: %d", type); |
| 347 | } else { |
| 348 | success = 1; |
| 349 | /* |
| 350 | * Get the response from the packet. This will abort with a |
| 351 | * fatal error if the packet is corrupt. |
| 352 | */ |
| 353 | for (i = 0; i < 16; i++) |
| 354 | response[i] = buffer_get_char(&buffer); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 355 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 356 | buffer_free(&buffer); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 357 | return success; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 358 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 359 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 360 | /* ask agent to sign data, returns -1 on error, 0 on success */ |
| 361 | int |
| 362 | ssh_agent_sign(AuthenticationConnection *auth, |
| 363 | Key *key, |
| 364 | unsigned char **sigp, int *lenp, |
| 365 | unsigned char *data, int datalen) |
| 366 | { |
| 367 | Buffer msg; |
| 368 | unsigned char *blob; |
| 369 | unsigned int blen; |
| 370 | int type; |
| 371 | int ret = -1; |
| 372 | |
| 373 | if (dsa_make_key_blob(key, &blob, &blen) == 0) |
| 374 | return -1; |
| 375 | |
| 376 | buffer_init(&msg); |
| 377 | buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST); |
| 378 | buffer_put_string(&msg, blob, blen); |
| 379 | buffer_put_string(&msg, data, datalen); |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 380 | buffer_put_int(&msg, 0); /* flags, unused */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 381 | xfree(blob); |
| 382 | |
| 383 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 384 | buffer_free(&msg); |
| 385 | return -1; |
| 386 | } |
| 387 | type = buffer_get_char(&msg); |
| 388 | if (type == SSH_AGENT_FAILURE) { |
| 389 | log("Agent admitted failure to sign using the key."); |
| 390 | } else if (type != SSH2_AGENT_SIGN_RESPONSE) { |
| 391 | fatal("Bad authentication response: %d", type); |
| 392 | } else { |
| 393 | ret = 0; |
| 394 | *sigp = buffer_get_string(&msg, lenp); |
| 395 | } |
| 396 | buffer_free(&msg); |
| 397 | return ret; |
| 398 | } |
| 399 | |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 400 | /* Encode key for a message to the agent. */ |
| 401 | |
| 402 | void |
| 403 | ssh_encode_identity_rsa(Buffer *b, RSA *key, const char *comment) |
| 404 | { |
| 405 | buffer_clear(b); |
| 406 | buffer_put_char(b, SSH_AGENTC_ADD_RSA_IDENTITY); |
| 407 | buffer_put_int(b, BN_num_bits(key->n)); |
| 408 | buffer_put_bignum(b, key->n); |
| 409 | buffer_put_bignum(b, key->e); |
| 410 | buffer_put_bignum(b, key->d); |
| 411 | /* To keep within the protocol: p < q for ssh. in SSL p > q */ |
| 412 | buffer_put_bignum(b, key->iqmp); /* ssh key->u */ |
| 413 | buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */ |
| 414 | buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */ |
| 415 | buffer_put_string(b, comment, strlen(comment)); |
| 416 | } |
| 417 | |
| 418 | void |
| 419 | ssh_encode_identity_dsa(Buffer *b, DSA *key, const char *comment) |
| 420 | { |
| 421 | buffer_clear(b); |
| 422 | buffer_put_char(b, SSH2_AGENTC_ADD_IDENTITY); |
| 423 | buffer_put_cstring(b, KEX_DSS); |
| 424 | buffer_put_bignum2(b, key->p); |
| 425 | buffer_put_bignum2(b, key->q); |
| 426 | buffer_put_bignum2(b, key->g); |
| 427 | buffer_put_bignum2(b, key->pub_key); |
| 428 | buffer_put_bignum2(b, key->priv_key); |
| 429 | buffer_put_string(b, comment, strlen(comment)); |
| 430 | } |
| 431 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 432 | /* |
| 433 | * Adds an identity to the authentication server. This call is not meant to |
| 434 | * be used by normal applications. |
| 435 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 436 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 437 | int |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 438 | ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 439 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 440 | Buffer msg; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 441 | int type; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 442 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 443 | buffer_init(&msg); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 444 | |
| 445 | switch (key->type) { |
| 446 | case KEY_RSA: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 447 | ssh_encode_identity_rsa(&msg, key->rsa, comment); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 448 | break; |
| 449 | case KEY_DSA: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 450 | ssh_encode_identity_dsa(&msg, key->dsa, comment); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 451 | break; |
| 452 | default: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 453 | buffer_free(&msg); |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 454 | return 0; |
| 455 | break; |
| 456 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 457 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 458 | buffer_free(&msg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 459 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 460 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 461 | type = buffer_get_char(&msg); |
| 462 | buffer_free(&msg); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 463 | return decode_reply(type); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 464 | } |
| 465 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 466 | /* |
| 467 | * Removes an identity from the authentication server. This call is not |
| 468 | * meant to be used by normal applications. |
| 469 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 470 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 471 | int |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 472 | ssh_remove_identity(AuthenticationConnection *auth, Key *key) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 473 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 474 | Buffer msg; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 475 | int type; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 476 | unsigned char *blob; |
| 477 | unsigned int blen; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 478 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 479 | buffer_init(&msg); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 480 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 481 | if (key->type == KEY_RSA) { |
| 482 | buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY); |
| 483 | buffer_put_int(&msg, BN_num_bits(key->rsa->n)); |
| 484 | buffer_put_bignum(&msg, key->rsa->e); |
| 485 | buffer_put_bignum(&msg, key->rsa->n); |
| 486 | } else if (key->type == KEY_DSA) { |
| 487 | dsa_make_key_blob(key, &blob, &blen); |
| 488 | buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY); |
| 489 | buffer_put_string(&msg, blob, blen); |
| 490 | xfree(blob); |
| 491 | } else { |
| 492 | buffer_free(&msg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 493 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 494 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 495 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 496 | buffer_free(&msg); |
| 497 | return 0; |
| 498 | } |
| 499 | type = buffer_get_char(&msg); |
| 500 | buffer_free(&msg); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 501 | return decode_reply(type); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 502 | } |
| 503 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 504 | /* |
| 505 | * Removes all identities from the agent. This call is not meant to be used |
| 506 | * by normal applications. |
| 507 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 508 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 509 | int |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 510 | ssh_remove_all_identities(AuthenticationConnection *auth, int version) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 511 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 512 | Buffer msg; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 513 | int type; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 514 | int code = (version==1) ? |
| 515 | SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES : |
| 516 | SSH2_AGENTC_REMOVE_ALL_IDENTITIES; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 517 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 518 | buffer_init(&msg); |
| 519 | buffer_put_char(&msg, code); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 520 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 521 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 522 | buffer_free(&msg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 523 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 524 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 525 | type = buffer_get_char(&msg); |
| 526 | buffer_free(&msg); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 527 | return decode_reply(type); |
| 528 | } |
| 529 | |
| 530 | int |
| 531 | decode_reply(int type) |
| 532 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 533 | switch (type) { |
| 534 | case SSH_AGENT_FAILURE: |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 535 | log("SSH_AGENT_FAILURE"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 536 | return 0; |
| 537 | case SSH_AGENT_SUCCESS: |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 538 | return 1; |
| 539 | default: |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 540 | fatal("Bad response from authentication agent: %d", type); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 541 | } |
| 542 | /* NOTREACHED */ |
| 543 | return 0; |
| 544 | } |