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 | * |
| 3 | * authfd.c |
| 4 | * |
| 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 6 | * |
| 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 8 | * All rights reserved |
| 9 | * |
| 10 | * Created: Wed Mar 29 01:30:28 1995 ylo |
| 11 | * |
| 12 | * Functions for connecting the local authentication agent. |
| 13 | * |
| 14 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 15 | |
| 16 | #include "includes.h" |
Damien Miller | 22c7726 | 2000-04-13 12:26:34 +1000 | [diff] [blame^] | 17 | RCSID("$Id: authfd.c,v 1.11 2000/04/13 02:26:35 damien Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 18 | |
| 19 | #include "ssh.h" |
| 20 | #include "rsa.h" |
| 21 | #include "authfd.h" |
| 22 | #include "buffer.h" |
| 23 | #include "bufaux.h" |
| 24 | #include "xmalloc.h" |
| 25 | #include "getput.h" |
| 26 | |
Damien Miller | 7f6ea02 | 1999-10-28 13:25:17 +1000 | [diff] [blame] | 27 | #ifdef HAVE_OPENSSL |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 28 | #include <openssl/rsa.h> |
Damien Miller | 7f6ea02 | 1999-10-28 13:25:17 +1000 | [diff] [blame] | 29 | #endif |
| 30 | #ifdef HAVE_SSL |
| 31 | #include <ssl/rsa.h> |
| 32 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 33 | |
| 34 | /* Returns the number of the authentication fd, or -1 if there is none. */ |
| 35 | |
| 36 | int |
| 37 | ssh_get_authentication_socket() |
| 38 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 39 | const char *authsocket; |
| 40 | int sock; |
| 41 | struct sockaddr_un sunaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 42 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 43 | authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME); |
| 44 | if (!authsocket) |
| 45 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 46 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 47 | sunaddr.sun_family = AF_UNIX; |
| 48 | strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path)); |
Damien Miller | 10f6f6b | 1999-11-17 17:29:08 +1100 | [diff] [blame] | 49 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 50 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 51 | if (sock < 0) |
| 52 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 53 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 54 | /* close on exec */ |
| 55 | if (fcntl(sock, F_SETFD, 1) == -1) { |
| 56 | close(sock); |
| 57 | return -1; |
| 58 | } |
| 59 | if (connect(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { |
| 60 | close(sock); |
| 61 | return -1; |
| 62 | } |
| 63 | return sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 64 | } |
| 65 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 66 | /* |
| 67 | * Closes the agent socket if it should be closed (depends on how it was |
| 68 | * obtained). The argument must have been returned by |
| 69 | * ssh_get_authentication_socket(). |
| 70 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 71 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 72 | void |
| 73 | ssh_close_authentication_socket(int sock) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 74 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 75 | if (getenv(SSH_AUTHSOCKET_ENV_NAME)) |
| 76 | close(sock); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 77 | } |
| 78 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 79 | /* |
| 80 | * Opens and connects a private socket for communication with the |
| 81 | * authentication agent. Returns the file descriptor (which must be |
| 82 | * shut down and closed by the caller when no longer needed). |
| 83 | * Returns NULL if an error occurred and the connection could not be |
| 84 | * opened. |
| 85 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 86 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 87 | AuthenticationConnection * |
| 88 | ssh_get_authentication_connection() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 89 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 90 | AuthenticationConnection *auth; |
| 91 | int sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 92 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 93 | sock = ssh_get_authentication_socket(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 94 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 95 | /* |
| 96 | * Fail if we couldn't obtain a connection. This happens if we |
| 97 | * exited due to a timeout. |
| 98 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 99 | if (sock < 0) |
| 100 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 101 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 102 | auth = xmalloc(sizeof(*auth)); |
| 103 | auth->fd = sock; |
| 104 | buffer_init(&auth->packet); |
| 105 | buffer_init(&auth->identities); |
| 106 | auth->howmany = 0; |
| 107 | |
| 108 | return auth; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 109 | } |
| 110 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 111 | /* |
| 112 | * Closes the connection to the authentication agent and frees any associated |
| 113 | * memory. |
| 114 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 115 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 116 | void |
| 117 | ssh_close_authentication_connection(AuthenticationConnection *ac) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 118 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 119 | buffer_free(&ac->packet); |
| 120 | buffer_free(&ac->identities); |
| 121 | close(ac->fd); |
| 122 | xfree(ac); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 123 | } |
| 124 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 125 | /* |
| 126 | * Returns the first authentication identity held by the agent. |
| 127 | * Returns true if an identity is available, 0 otherwise. |
| 128 | * The caller must initialize the integers before the call, and free the |
| 129 | * comment after a successful call (before calling ssh_get_next_identity). |
| 130 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 131 | |
| 132 | int |
| 133 | ssh_get_first_identity(AuthenticationConnection *auth, |
Damien Miller | 7e8e820 | 1999-11-16 13:37:16 +1100 | [diff] [blame] | 134 | BIGNUM *e, BIGNUM *n, char **comment) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 135 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 136 | unsigned char msg[8192]; |
| 137 | int len, l; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 138 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 139 | /* |
| 140 | * Send a message to the agent requesting for a list of the |
| 141 | * identities it can represent. |
| 142 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 143 | msg[0] = 0; |
| 144 | msg[1] = 0; |
| 145 | msg[2] = 0; |
| 146 | msg[3] = 1; |
| 147 | msg[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES; |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 148 | if (atomicio(write, auth->fd, msg, 5) != 5) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 149 | error("write auth->fd: %.100s", strerror(errno)); |
| 150 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 151 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 152 | /* Read the length of the response. XXX implement timeouts here. */ |
| 153 | len = 4; |
| 154 | while (len > 0) { |
| 155 | l = read(auth->fd, msg + 4 - len, len); |
| 156 | if (l <= 0) { |
| 157 | error("read auth->fd: %.100s", strerror(errno)); |
| 158 | return 0; |
| 159 | } |
| 160 | len -= l; |
| 161 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 163 | /* |
| 164 | * Extract the length, and check it for sanity. (We cannot trust |
| 165 | * authentication agents). |
| 166 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 167 | len = GET_32BIT(msg); |
| 168 | if (len < 1 || len > 256 * 1024) |
| 169 | fatal("Authentication reply message too long: %d\n", len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 170 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 171 | /* Read the packet itself. */ |
| 172 | buffer_clear(&auth->identities); |
| 173 | while (len > 0) { |
| 174 | l = len; |
| 175 | if (l > sizeof(msg)) |
| 176 | l = sizeof(msg); |
| 177 | l = read(auth->fd, msg, l); |
| 178 | if (l <= 0) |
| 179 | fatal("Incomplete authentication reply."); |
| 180 | buffer_append(&auth->identities, (char *) msg, l); |
| 181 | len -= l; |
| 182 | } |
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 | /* Get message type, and verify that we got a proper answer. */ |
| 185 | buffer_get(&auth->identities, (char *) msg, 1); |
| 186 | if (msg[0] != SSH_AGENT_RSA_IDENTITIES_ANSWER) |
| 187 | fatal("Bad authentication reply message type: %d", msg[0]); |
| 188 | |
| 189 | /* Get the number of entries in the response and check it for sanity. */ |
| 190 | auth->howmany = buffer_get_int(&auth->identities); |
| 191 | if (auth->howmany > 1024) |
| 192 | fatal("Too many identities in authentication reply: %d\n", auth->howmany); |
| 193 | |
| 194 | /* Return the first entry (if any). */ |
| 195 | return ssh_get_next_identity(auth, e, n, comment); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 196 | } |
| 197 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 198 | /* |
| 199 | * Returns the next authentication identity for the agent. Other functions |
| 200 | * can be called between this and ssh_get_first_identity or two calls of this |
| 201 | * function. This returns 0 if there are no more identities. The caller |
| 202 | * must free comment after a successful return. |
| 203 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 204 | |
| 205 | int |
| 206 | ssh_get_next_identity(AuthenticationConnection *auth, |
Damien Miller | 7e8e820 | 1999-11-16 13:37:16 +1100 | [diff] [blame] | 207 | BIGNUM *e, BIGNUM *n, char **comment) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 208 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 209 | unsigned int bits; |
Damien Miller | 7e8e820 | 1999-11-16 13:37:16 +1100 | [diff] [blame] | 210 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 211 | /* Return failure if no more entries. */ |
| 212 | if (auth->howmany <= 0) |
| 213 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 214 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 215 | /* |
| 216 | * Get the next entry from the packet. These will abort with a fatal |
| 217 | * error if the packet is too short or contains corrupt data. |
| 218 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 219 | bits = buffer_get_int(&auth->identities); |
| 220 | buffer_get_bignum(&auth->identities, e); |
| 221 | buffer_get_bignum(&auth->identities, n); |
| 222 | *comment = buffer_get_string(&auth->identities, NULL); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 223 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 224 | if (bits != BN_num_bits(n)) |
Damien Miller | 5e7c10e | 1999-12-16 13:18:04 +1100 | [diff] [blame] | 225 | error("Warning: identity keysize mismatch: actual %d, announced %u", |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 226 | BN_num_bits(n), bits); |
Damien Miller | 7e8e820 | 1999-11-16 13:37:16 +1100 | [diff] [blame] | 227 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 228 | /* Decrement the number of remaining entries. */ |
| 229 | auth->howmany--; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 230 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 231 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 232 | } |
| 233 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 234 | /* |
| 235 | * Generates a random challenge, sends it to the agent, and waits for |
| 236 | * response from the agent. Returns true (non-zero) if the agent gave the |
| 237 | * correct answer, zero otherwise. Response type selects the style of |
| 238 | * response desired, with 0 corresponding to protocol version 1.0 (no longer |
| 239 | * supported) and 1 corresponding to protocol version 1.1. |
| 240 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 241 | |
| 242 | int |
| 243 | ssh_decrypt_challenge(AuthenticationConnection *auth, |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 244 | BIGNUM* e, BIGNUM *n, BIGNUM *challenge, |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 245 | unsigned char session_id[16], |
| 246 | unsigned int response_type, |
| 247 | unsigned char response[16]) |
| 248 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 249 | Buffer buffer; |
| 250 | unsigned char buf[8192]; |
| 251 | int len, l, i; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 252 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 253 | /* Response type 0 is no longer supported. */ |
| 254 | if (response_type == 0) |
| 255 | fatal("Compatibility with ssh protocol version 1.0 no longer supported."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 256 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 257 | /* Format a message to the agent. */ |
| 258 | buf[0] = SSH_AGENTC_RSA_CHALLENGE; |
| 259 | buffer_init(&buffer); |
| 260 | buffer_append(&buffer, (char *) buf, 1); |
| 261 | buffer_put_int(&buffer, BN_num_bits(n)); |
| 262 | buffer_put_bignum(&buffer, e); |
| 263 | buffer_put_bignum(&buffer, n); |
| 264 | buffer_put_bignum(&buffer, challenge); |
| 265 | buffer_append(&buffer, (char *) session_id, 16); |
| 266 | buffer_put_int(&buffer, response_type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 267 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 268 | /* Get the length of the message, and format it in the buffer. */ |
| 269 | len = buffer_len(&buffer); |
| 270 | PUT_32BIT(buf, len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 271 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 272 | /* Send the length and then the packet to the agent. */ |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 273 | if (atomicio(write, auth->fd, buf, 4) != 4 || |
| 274 | atomicio(write, auth->fd, buffer_ptr(&buffer), |
| 275 | buffer_len(&buffer)) != buffer_len(&buffer)) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 276 | error("Error writing to authentication socket."); |
| 277 | error_cleanup: |
| 278 | buffer_free(&buffer); |
| 279 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 280 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 281 | /* |
| 282 | * Wait for response from the agent. First read the length of the |
| 283 | * response packet. |
| 284 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 285 | len = 4; |
| 286 | while (len > 0) { |
| 287 | l = read(auth->fd, buf + 4 - len, len); |
| 288 | if (l <= 0) { |
| 289 | error("Error reading response length from authentication socket."); |
| 290 | goto error_cleanup; |
| 291 | } |
| 292 | len -= l; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 293 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 294 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 295 | /* Extract the length, and check it for sanity. */ |
| 296 | len = GET_32BIT(buf); |
| 297 | if (len > 256 * 1024) |
| 298 | fatal("Authentication response too long: %d", len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 299 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 300 | /* Read the rest of the response in tothe buffer. */ |
| 301 | buffer_clear(&buffer); |
| 302 | while (len > 0) { |
| 303 | l = len; |
| 304 | if (l > sizeof(buf)) |
| 305 | l = sizeof(buf); |
| 306 | l = read(auth->fd, buf, l); |
| 307 | if (l <= 0) { |
| 308 | error("Error reading response from authentication socket."); |
| 309 | goto error_cleanup; |
| 310 | } |
| 311 | buffer_append(&buffer, (char *) buf, l); |
| 312 | len -= l; |
| 313 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 314 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 315 | /* Get the type of the packet. */ |
| 316 | buffer_get(&buffer, (char *) buf, 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 317 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 318 | /* Check for agent failure message. */ |
| 319 | if (buf[0] == SSH_AGENT_FAILURE) { |
| 320 | log("Agent admitted failure to authenticate using the key."); |
| 321 | goto error_cleanup; |
| 322 | } |
| 323 | /* Now it must be an authentication response packet. */ |
| 324 | if (buf[0] != SSH_AGENT_RSA_RESPONSE) |
| 325 | fatal("Bad authentication response: %d", buf[0]); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 326 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 327 | /* |
| 328 | * Get the response from the packet. This will abort with a fatal |
| 329 | * error if the packet is corrupt. |
| 330 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 331 | for (i = 0; i < 16; i++) |
| 332 | response[i] = buffer_get_char(&buffer); |
| 333 | |
| 334 | /* The buffer containing the packet is no longer needed. */ |
| 335 | buffer_free(&buffer); |
| 336 | |
| 337 | /* Correct answer. */ |
| 338 | return 1; |
| 339 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 340 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 341 | /* |
| 342 | * Adds an identity to the authentication server. This call is not meant to |
| 343 | * be used by normal applications. |
| 344 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 345 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 346 | int |
| 347 | ssh_add_identity(AuthenticationConnection *auth, |
| 348 | RSA * key, const char *comment) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 349 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 350 | Buffer buffer; |
| 351 | unsigned char buf[8192]; |
| 352 | int len, l, type; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 353 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 354 | /* Format a message to the agent. */ |
| 355 | buffer_init(&buffer); |
| 356 | buffer_put_char(&buffer, SSH_AGENTC_ADD_RSA_IDENTITY); |
| 357 | buffer_put_int(&buffer, BN_num_bits(key->n)); |
| 358 | buffer_put_bignum(&buffer, key->n); |
| 359 | buffer_put_bignum(&buffer, key->e); |
| 360 | buffer_put_bignum(&buffer, key->d); |
| 361 | /* To keep within the protocol: p < q for ssh. in SSL p > q */ |
| 362 | buffer_put_bignum(&buffer, key->iqmp); /* ssh key->u */ |
| 363 | buffer_put_bignum(&buffer, key->q); /* ssh key->p, SSL key->q */ |
| 364 | buffer_put_bignum(&buffer, key->p); /* ssh key->q, SSL key->p */ |
| 365 | buffer_put_string(&buffer, comment, strlen(comment)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 366 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 367 | /* Get the length of the message, and format it in the buffer. */ |
| 368 | len = buffer_len(&buffer); |
| 369 | PUT_32BIT(buf, len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 370 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 371 | /* Send the length and then the packet to the agent. */ |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 372 | if (atomicio(write, auth->fd, buf, 4) != 4 || |
| 373 | atomicio(write, auth->fd, buffer_ptr(&buffer), |
| 374 | buffer_len(&buffer)) != buffer_len(&buffer)) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 375 | error("Error writing to authentication socket."); |
| 376 | error_cleanup: |
| 377 | buffer_free(&buffer); |
| 378 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 379 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 380 | /* Wait for response from the agent. First read the length of the |
| 381 | response packet. */ |
| 382 | len = 4; |
| 383 | while (len > 0) { |
| 384 | l = read(auth->fd, buf + 4 - len, len); |
| 385 | if (l <= 0) { |
| 386 | error("Error reading response length from authentication socket."); |
| 387 | goto error_cleanup; |
| 388 | } |
| 389 | len -= l; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 390 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 391 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 392 | /* Extract the length, and check it for sanity. */ |
| 393 | len = GET_32BIT(buf); |
| 394 | if (len > 256 * 1024) |
| 395 | fatal("Add identity response too long: %d", len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 396 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 397 | /* Read the rest of the response in tothe buffer. */ |
| 398 | buffer_clear(&buffer); |
| 399 | while (len > 0) { |
| 400 | l = len; |
| 401 | if (l > sizeof(buf)) |
| 402 | l = sizeof(buf); |
| 403 | l = read(auth->fd, buf, l); |
| 404 | if (l <= 0) { |
| 405 | error("Error reading response from authentication socket."); |
| 406 | goto error_cleanup; |
| 407 | } |
| 408 | buffer_append(&buffer, (char *) buf, l); |
| 409 | len -= l; |
| 410 | } |
| 411 | |
| 412 | /* Get the type of the packet. */ |
| 413 | type = buffer_get_char(&buffer); |
| 414 | switch (type) { |
| 415 | case SSH_AGENT_FAILURE: |
| 416 | buffer_free(&buffer); |
| 417 | return 0; |
| 418 | case SSH_AGENT_SUCCESS: |
| 419 | buffer_free(&buffer); |
| 420 | return 1; |
| 421 | default: |
| 422 | fatal("Bad response to add identity from authentication agent: %d", |
| 423 | type); |
| 424 | } |
| 425 | /* NOTREACHED */ |
| 426 | return 0; |
| 427 | } |
| 428 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 429 | /* |
| 430 | * Removes an identity from the authentication server. This call is not |
| 431 | * meant to be used by normal applications. |
| 432 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 433 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 434 | int |
| 435 | ssh_remove_identity(AuthenticationConnection *auth, RSA *key) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 436 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 437 | Buffer buffer; |
| 438 | unsigned char buf[8192]; |
| 439 | int len, l, type; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 440 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 441 | /* Format a message to the agent. */ |
| 442 | buffer_init(&buffer); |
| 443 | buffer_put_char(&buffer, SSH_AGENTC_REMOVE_RSA_IDENTITY); |
| 444 | buffer_put_int(&buffer, BN_num_bits(key->n)); |
| 445 | buffer_put_bignum(&buffer, key->e); |
| 446 | buffer_put_bignum(&buffer, key->n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 447 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 448 | /* Get the length of the message, and format it in the buffer. */ |
| 449 | len = buffer_len(&buffer); |
| 450 | PUT_32BIT(buf, len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 451 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 452 | /* Send the length and then the packet to the agent. */ |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 453 | if (atomicio(write, auth->fd, buf, 4) != 4 || |
| 454 | atomicio(write, auth->fd, buffer_ptr(&buffer), |
| 455 | buffer_len(&buffer)) != buffer_len(&buffer)) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 456 | error("Error writing to authentication socket."); |
| 457 | error_cleanup: |
| 458 | buffer_free(&buffer); |
| 459 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 460 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 461 | /* |
| 462 | * Wait for response from the agent. First read the length of the |
| 463 | * response packet. |
| 464 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 465 | len = 4; |
| 466 | while (len > 0) { |
| 467 | l = read(auth->fd, buf + 4 - len, len); |
| 468 | if (l <= 0) { |
| 469 | error("Error reading response length from authentication socket."); |
| 470 | goto error_cleanup; |
| 471 | } |
| 472 | len -= l; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 473 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 474 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 475 | /* Extract the length, and check it for sanity. */ |
| 476 | len = GET_32BIT(buf); |
| 477 | if (len > 256 * 1024) |
| 478 | fatal("Remove identity response too long: %d", len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 479 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 480 | /* Read the rest of the response in tothe buffer. */ |
| 481 | buffer_clear(&buffer); |
| 482 | while (len > 0) { |
| 483 | l = len; |
| 484 | if (l > sizeof(buf)) |
| 485 | l = sizeof(buf); |
| 486 | l = read(auth->fd, buf, l); |
| 487 | if (l <= 0) { |
| 488 | error("Error reading response from authentication socket."); |
| 489 | goto error_cleanup; |
| 490 | } |
| 491 | buffer_append(&buffer, (char *) buf, l); |
| 492 | len -= l; |
| 493 | } |
| 494 | |
| 495 | /* Get the type of the packet. */ |
| 496 | type = buffer_get_char(&buffer); |
| 497 | switch (type) { |
| 498 | case SSH_AGENT_FAILURE: |
| 499 | buffer_free(&buffer); |
| 500 | return 0; |
| 501 | case SSH_AGENT_SUCCESS: |
| 502 | buffer_free(&buffer); |
| 503 | return 1; |
| 504 | default: |
| 505 | fatal("Bad response to remove identity from authentication agent: %d", |
| 506 | type); |
| 507 | } |
| 508 | /* NOTREACHED */ |
| 509 | return 0; |
| 510 | } |
| 511 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 512 | /* |
| 513 | * Removes all identities from the agent. This call is not meant to be used |
| 514 | * by normal applications. |
| 515 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 516 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 517 | int |
| 518 | ssh_remove_all_identities(AuthenticationConnection *auth) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 519 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 520 | Buffer buffer; |
| 521 | unsigned char buf[8192]; |
| 522 | int len, l, type; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 523 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 524 | /* Get the length of the message, and format it in the buffer. */ |
| 525 | PUT_32BIT(buf, 1); |
| 526 | buf[4] = SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 527 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 528 | /* Send the length and then the packet to the agent. */ |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 529 | if (atomicio(write, auth->fd, buf, 5) != 5) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 530 | error("Error writing to authentication socket."); |
| 531 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 532 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 533 | /* |
| 534 | * Wait for response from the agent. First read the length of the |
| 535 | * response packet. |
| 536 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 537 | len = 4; |
| 538 | while (len > 0) { |
| 539 | l = read(auth->fd, buf + 4 - len, len); |
| 540 | if (l <= 0) { |
| 541 | error("Error reading response length from authentication socket."); |
| 542 | return 0; |
| 543 | } |
| 544 | len -= l; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 545 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 546 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 547 | /* Extract the length, and check it for sanity. */ |
| 548 | len = GET_32BIT(buf); |
| 549 | if (len > 256 * 1024) |
| 550 | fatal("Remove identity response too long: %d", len); |
| 551 | |
| 552 | /* Read the rest of the response into the buffer. */ |
| 553 | buffer_init(&buffer); |
| 554 | while (len > 0) { |
| 555 | l = len; |
| 556 | if (l > sizeof(buf)) |
| 557 | l = sizeof(buf); |
| 558 | l = read(auth->fd, buf, l); |
| 559 | if (l <= 0) { |
| 560 | error("Error reading response from authentication socket."); |
| 561 | buffer_free(&buffer); |
| 562 | return 0; |
| 563 | } |
| 564 | buffer_append(&buffer, (char *) buf, l); |
| 565 | len -= l; |
| 566 | } |
| 567 | |
| 568 | /* Get the type of the packet. */ |
| 569 | type = buffer_get_char(&buffer); |
| 570 | switch (type) { |
| 571 | case SSH_AGENT_FAILURE: |
| 572 | buffer_free(&buffer); |
| 573 | return 0; |
| 574 | case SSH_AGENT_SUCCESS: |
| 575 | buffer_free(&buffer); |
| 576 | return 1; |
| 577 | default: |
| 578 | fatal("Bad response to remove identity from authentication agent: %d", |
| 579 | type); |
| 580 | } |
| 581 | /* NOTREACHED */ |
| 582 | return 0; |
| 583 | } |