Annotation of src/usr.bin/ssh/authfd.c, Revision 1.129
1.129 ! djm 1: /* $OpenBSD: authfd.c,v 1.128 2021/12/19 22:08:48 djm Exp $ */
1.1 deraadt 2: /*
1.13 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.27 deraadt 6: * Functions for connecting the local authentication agent.
1.18 markus 7: *
1.27 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
1.18 markus 13: *
1.25 markus 14: * SSH2 implementation,
1.27 deraadt 15: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.25 markus 16: *
1.27 deraadt 17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.13 deraadt 36: */
1.1 deraadt 37:
1.67 stevesk 38:
39: #include <sys/types.h>
40: #include <sys/un.h>
1.75 stevesk 41: #include <sys/socket.h>
1.33 markus 42:
1.76 stevesk 43: #include <fcntl.h>
1.79 stevesk 44: #include <stdlib.h>
1.80 deraadt 45: #include <signal.h>
1.78 stevesk 46: #include <string.h>
1.120 deraadt 47: #include <stdarg.h>
1.77 stevesk 48: #include <unistd.h>
1.94 djm 49: #include <errno.h>
1.1 deraadt 50:
1.80 deraadt 51: #include "xmalloc.h"
1.1 deraadt 52: #include "ssh.h"
1.94 djm 53: #include "sshbuf.h"
54: #include "sshkey.h"
1.22 markus 55: #include "authfd.h"
1.33 markus 56: #include "cipher.h"
1.28 markus 57: #include "compat.h"
1.33 markus 58: #include "log.h"
59: #include "atomicio.h"
1.74 djm 60: #include "misc.h"
1.94 djm 61: #include "ssherr.h"
1.2 provos 62:
1.94 djm 63: #define MAX_AGENT_IDENTITIES 2048 /* Max keys in agent reply */
1.126 djm 64: #define MAX_AGENT_REPLY_LEN (256 * 1024) /* Max bytes in agent reply */
1.21 markus 65:
1.29 markus 66: /* macro to check for "agent failure" message */
67: #define agent_failed(x) \
1.94 djm 68: ((x == SSH_AGENT_FAILURE) || \
69: (x == SSH_COM_AGENT2_FAILURE) || \
1.55 deraadt 70: (x == SSH2_AGENT_FAILURE))
1.29 markus 71:
1.94 djm 72: /* Convert success/failure response from agent to a err.h status */
73: static int
74: decode_reply(u_char type)
1.57 stevesk 75: {
1.94 djm 76: if (agent_failed(type))
77: return SSH_ERR_AGENT_FAILURE;
78: else if (type == SSH_AGENT_SUCCESS)
1.57 stevesk 79: return 0;
1.94 djm 80: else
81: return SSH_ERR_INVALID_FORMAT;
1.57 stevesk 82: }
83:
1.121 djm 84: /*
85: * Opens an authentication socket at the provided path and stores the file
86: * descriptor in fdp. Returns 0 on success and an error on failure.
87: */
1.2 provos 88: int
1.121 djm 89: ssh_get_authentication_socket_path(const char *authsocket, int *fdp)
1.1 deraadt 90: {
1.94 djm 91: int sock, oerrno;
1.12 markus 92: struct sockaddr_un sunaddr;
93:
1.92 tedu 94: memset(&sunaddr, 0, sizeof(sunaddr));
1.12 markus 95: sunaddr.sun_family = AF_UNIX;
96: strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
97:
1.115 deraadt 98: if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.94 djm 99: return SSH_ERR_SYSTEM_ERROR;
1.12 markus 100:
101: /* close on exec */
1.94 djm 102: if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1 ||
1.115 deraadt 103: connect(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1.94 djm 104: oerrno = errno;
1.12 markus 105: close(sock);
1.94 djm 106: errno = oerrno;
107: return SSH_ERR_SYSTEM_ERROR;
1.12 markus 108: }
1.94 djm 109: if (fdp != NULL)
110: *fdp = sock;
111: else
1.12 markus 112: close(sock);
1.94 djm 113: return 0;
1.121 djm 114: }
115:
116: /*
117: * Opens the default authentication socket and stores the file descriptor in
118: * fdp. Returns 0 on success and an error on failure.
119: */
120: int
121: ssh_get_authentication_socket(int *fdp)
122: {
123: const char *authsocket;
124:
125: if (fdp != NULL)
126: *fdp = -1;
127:
128: authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
129: if (authsocket == NULL || *authsocket == '\0')
130: return SSH_ERR_AGENT_NOT_PRESENT;
131:
132: return ssh_get_authentication_socket_path(authsocket, fdp);
1.1 deraadt 133: }
134:
1.94 djm 135: /* Communicate with agent: send request and read reply */
1.41 itojun 136: static int
1.94 djm 137: ssh_request_reply(int sock, struct sshbuf *request, struct sshbuf *reply)
1.24 markus 138: {
1.94 djm 139: int r;
140: size_t l, len;
1.24 markus 141: char buf[1024];
142:
143: /* Get the length of the message, and format it in the buffer. */
1.94 djm 144: len = sshbuf_len(request);
1.108 markus 145: POKE_U32(buf, len);
1.24 markus 146:
147: /* Send the length and then the packet to the agent. */
1.94 djm 148: if (atomicio(vwrite, sock, buf, 4) != 4 ||
1.111 markus 149: atomicio(vwrite, sock, sshbuf_mutable_ptr(request),
1.94 djm 150: sshbuf_len(request)) != sshbuf_len(request))
151: return SSH_ERR_AGENT_COMMUNICATION;
1.24 markus 152: /*
153: * Wait for response from the agent. First read the length of the
154: * response packet.
155: */
1.94 djm 156: if (atomicio(read, sock, buf, 4) != 4)
157: return SSH_ERR_AGENT_COMMUNICATION;
1.24 markus 158:
159: /* Extract the length, and check it for sanity. */
1.108 markus 160: len = PEEK_U32(buf);
1.94 djm 161: if (len > MAX_AGENT_REPLY_LEN)
162: return SSH_ERR_INVALID_FORMAT;
1.24 markus 163:
164: /* Read the rest of the response in to the buffer. */
1.94 djm 165: sshbuf_reset(reply);
1.24 markus 166: while (len > 0) {
167: l = len;
168: if (l > sizeof(buf))
169: l = sizeof(buf);
1.94 djm 170: if (atomicio(read, sock, buf, l) != l)
171: return SSH_ERR_AGENT_COMMUNICATION;
172: if ((r = sshbuf_put(reply, buf, l)) != 0)
173: return r;
1.24 markus 174: len -= l;
175: }
1.94 djm 176: return 0;
1.24 markus 177: }
178:
1.127 djm 179: /* Communicate with agent: sent request, read and decode status reply */
180: static int
181: ssh_request_reply_decode(int sock, struct sshbuf *request)
182: {
183: struct sshbuf *reply;
184: int r;
185: u_char type;
186:
187: if ((reply = sshbuf_new()) == NULL)
188: return SSH_ERR_ALLOC_FAIL;
189: if ((r = ssh_request_reply(sock, request, reply)) != 0 ||
190: (r = sshbuf_get_u8(reply, &type)) != 0 ||
191: (r = decode_reply(type)) != 0)
192: goto out;
193: /* success */
194: r = 0;
195: out:
196: sshbuf_free(reply);
197: return r;
198: }
199:
1.14 markus 200: /*
201: * Closes the agent socket if it should be closed (depends on how it was
202: * obtained). The argument must have been returned by
203: * ssh_get_authentication_socket().
204: */
1.18 markus 205: void
1.12 markus 206: ssh_close_authentication_socket(int sock)
1.1 deraadt 207: {
1.12 markus 208: if (getenv(SSH_AUTHSOCKET_ENV_NAME))
209: close(sock);
1.1 deraadt 210: }
211:
1.94 djm 212: /* Lock/unlock agent */
213: int
214: ssh_lock_agent(int sock, int lock, const char *password)
1.1 deraadt 215: {
1.94 djm 216: int r;
217: u_char type = lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK;
218: struct sshbuf *msg;
219:
220: if ((msg = sshbuf_new()) == NULL)
221: return SSH_ERR_ALLOC_FAIL;
222: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
1.127 djm 223: (r = sshbuf_put_cstring(msg, password)) != 0 ||
224: (r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 225: goto out;
1.127 djm 226: /* success */
227: r = 0;
1.94 djm 228: out:
229: sshbuf_free(msg);
230: return r;
1.1 deraadt 231: }
232:
1.50 markus 233:
1.94 djm 234: static int
235: deserialise_identity2(struct sshbuf *ids, struct sshkey **keyp, char **commentp)
1.50 markus 236: {
1.94 djm 237: int r;
238: char *comment = NULL;
239: const u_char *blob;
240: size_t blen;
241:
242: if ((r = sshbuf_get_string_direct(ids, &blob, &blen)) != 0 ||
243: (r = sshbuf_get_cstring(ids, &comment, NULL)) != 0)
244: goto out;
245: if ((r = sshkey_from_blob(blob, blen, keyp)) != 0)
246: goto out;
247: if (commentp != NULL) {
248: *commentp = comment;
249: comment = NULL;
250: }
251: r = 0;
252: out:
253: free(comment);
254: return r;
1.1 deraadt 255: }
256:
1.14 markus 257: /*
1.94 djm 258: * Fetch list of identities held by the agent.
1.14 markus 259: */
1.30 markus 260: int
1.103 naddy 261: ssh_fetch_identitylist(int sock, struct ssh_identitylist **idlp)
1.1 deraadt 262: {
1.103 naddy 263: u_char type;
1.94 djm 264: u_int32_t num, i;
265: struct sshbuf *msg;
266: struct ssh_identitylist *idl = NULL;
267: int r;
1.25 markus 268:
1.14 markus 269: /*
270: * Send a message to the agent requesting for a list of the
271: * identities it can represent.
272: */
1.94 djm 273: if ((msg = sshbuf_new()) == NULL)
274: return SSH_ERR_ALLOC_FAIL;
1.103 naddy 275: if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_REQUEST_IDENTITIES)) != 0)
1.94 djm 276: goto out;
1.12 markus 277:
1.94 djm 278: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
279: goto out;
1.1 deraadt 280:
1.12 markus 281: /* Get message type, and verify that we got a proper answer. */
1.94 djm 282: if ((r = sshbuf_get_u8(msg, &type)) != 0)
283: goto out;
1.29 markus 284: if (agent_failed(type)) {
1.94 djm 285: r = SSH_ERR_AGENT_FAILURE;
286: goto out;
1.103 naddy 287: } else if (type != SSH2_AGENT_IDENTITIES_ANSWER) {
1.94 djm 288: r = SSH_ERR_INVALID_FORMAT;
289: goto out;
1.25 markus 290: }
1.12 markus 291:
292: /* Get the number of entries in the response and check it for sanity. */
1.94 djm 293: if ((r = sshbuf_get_u32(msg, &num)) != 0)
294: goto out;
295: if (num > MAX_AGENT_IDENTITIES) {
296: r = SSH_ERR_INVALID_FORMAT;
297: goto out;
298: }
299: if (num == 0) {
300: r = SSH_ERR_AGENT_NO_IDENTITIES;
301: goto out;
302: }
303:
304: /* Deserialise the response into a list of keys/comments */
305: if ((idl = calloc(1, sizeof(*idl))) == NULL ||
306: (idl->keys = calloc(num, sizeof(*idl->keys))) == NULL ||
307: (idl->comments = calloc(num, sizeof(*idl->comments))) == NULL) {
308: r = SSH_ERR_ALLOC_FAIL;
309: goto out;
310: }
311: for (i = 0; i < num;) {
1.103 naddy 312: if ((r = deserialise_identity2(msg, &(idl->keys[i]),
313: &(idl->comments[i]))) != 0) {
314: if (r == SSH_ERR_KEY_TYPE_UNKNOWN) {
315: /* Gracefully skip unknown key types */
316: num--;
317: continue;
318: } else
319: goto out;
1.94 djm 320: }
321: i++;
322: }
323: idl->nkeys = num;
324: *idlp = idl;
325: idl = NULL;
326: r = 0;
327: out:
328: sshbuf_free(msg);
329: if (idl != NULL)
330: ssh_free_identitylist(idl);
331: return r;
1.30 markus 332: }
333:
1.94 djm 334: void
335: ssh_free_identitylist(struct ssh_identitylist *idl)
1.30 markus 336: {
1.94 djm 337: size_t i;
1.1 deraadt 338:
1.94 djm 339: if (idl == NULL)
340: return;
341: for (i = 0; i < idl->nkeys; i++) {
342: if (idl->keys != NULL)
343: sshkey_free(idl->keys[i]);
344: if (idl->comments != NULL)
345: free(idl->comments[i]);
1.25 markus 346: }
1.116 djm 347: free(idl->keys);
348: free(idl->comments);
1.94 djm 349: free(idl);
1.117 djm 350: }
351:
352: /*
353: * Check if the ssh agent has a given key.
354: * Returns 0 if found, or a negative SSH_ERR_* error code on failure.
355: */
356: int
1.124 djm 357: ssh_agent_has_key(int sock, const struct sshkey *key)
1.117 djm 358: {
359: int r, ret = SSH_ERR_KEY_NOT_FOUND;
360: size_t i;
361: struct ssh_identitylist *idlist = NULL;
362:
1.123 markus 363: if ((r = ssh_fetch_identitylist(sock, &idlist)) != 0) {
1.117 djm 364: return r;
365: }
366:
367: for (i = 0; i < idlist->nkeys; i++) {
368: if (sshkey_equal_public(idlist->keys[i], key)) {
369: ret = 0;
370: break;
371: }
372: }
373:
374: ssh_free_identitylist(idlist);
375: return ret;
1.1 deraadt 376: }
377:
1.14 markus 378: /*
1.94 djm 379: * Sends a challenge (typically from a server via ssh(1)) to the agent,
380: * and waits for a response from the agent.
381: * Returns true (non-zero) if the agent gave the correct answer, zero
382: * otherwise.
1.14 markus 383: */
1.1 deraadt 384:
385:
1.109 djm 386: /* encode signature algorithm in flag bits, so we can keep the msg format */
1.100 markus 387: static u_int
1.104 djm 388: agent_encode_alg(const struct sshkey *key, const char *alg)
1.100 markus 389: {
1.113 djm 390: if (alg != NULL && sshkey_type_plain(key->type) == KEY_RSA) {
391: if (strcmp(alg, "rsa-sha2-256") == 0 ||
392: strcmp(alg, "rsa-sha2-256-cert-v01@openssh.com") == 0)
1.100 markus 393: return SSH_AGENT_RSA_SHA2_256;
1.113 djm 394: if (strcmp(alg, "rsa-sha2-512") == 0 ||
395: strcmp(alg, "rsa-sha2-512-cert-v01@openssh.com") == 0)
1.100 markus 396: return SSH_AGENT_RSA_SHA2_512;
397: }
398: return 0;
399: }
400:
1.94 djm 401: /* ask agent to sign data, returns err.h code on error, 0 on success */
1.25 markus 402: int
1.104 djm 403: ssh_agent_sign(int sock, const struct sshkey *key,
1.94 djm 404: u_char **sigp, size_t *lenp,
1.100 markus 405: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.94 djm 406: {
407: struct sshbuf *msg;
1.110 djm 408: u_char *sig = NULL, type = 0;
409: size_t len = 0;
1.94 djm 410: u_int flags = 0;
411: int r = SSH_ERR_INTERNAL_ERROR;
412:
1.97 markus 413: *sigp = NULL;
414: *lenp = 0;
1.94 djm 415:
416: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
417: return SSH_ERR_INVALID_ARGUMENT;
418: if ((msg = sshbuf_new()) == NULL)
419: return SSH_ERR_ALLOC_FAIL;
1.100 markus 420: flags |= agent_encode_alg(key, alg);
1.94 djm 421: if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 ||
1.110 djm 422: (r = sshkey_puts(key, msg)) != 0 ||
1.94 djm 423: (r = sshbuf_put_string(msg, data, datalen)) != 0 ||
424: (r = sshbuf_put_u32(msg, flags)) != 0)
425: goto out;
1.99 jsg 426: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
1.94 djm 427: goto out;
428: if ((r = sshbuf_get_u8(msg, &type)) != 0)
429: goto out;
1.29 markus 430: if (agent_failed(type)) {
1.94 djm 431: r = SSH_ERR_AGENT_FAILURE;
432: goto out;
1.25 markus 433: } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
1.94 djm 434: r = SSH_ERR_INVALID_FORMAT;
435: goto out;
436: }
1.110 djm 437: if ((r = sshbuf_get_string(msg, &sig, &len)) != 0)
438: goto out;
439: /* Check what we actually got back from the agent. */
440: if ((r = sshkey_check_sigtype(sig, len, alg)) != 0)
1.94 djm 441: goto out;
1.110 djm 442: /* success */
443: *sigp = sig;
1.97 markus 444: *lenp = len;
1.110 djm 445: sig = NULL;
446: len = 0;
1.94 djm 447: r = 0;
448: out:
1.110 djm 449: freezero(sig, len);
1.94 djm 450: sshbuf_free(msg);
451: return r;
1.25 markus 452: }
453:
1.22 markus 454: /* Encode key for a message to the agent. */
455:
1.129 ! djm 456: static int
! 457: encode_dest_constraint_hop(struct sshbuf *m,
! 458: const struct dest_constraint_hop *dch)
! 459: {
! 460: struct sshbuf *b;
! 461: u_int i;
! 462: int r;
! 463:
! 464: if ((b = sshbuf_new()) == NULL)
! 465: return SSH_ERR_ALLOC_FAIL;
! 466: if ((r = sshbuf_put_cstring(b, dch->user)) != 0 ||
! 467: (r = sshbuf_put_cstring(b, dch->hostname)) != 0 ||
! 468: (r = sshbuf_put_string(b, NULL, 0)) != 0) /* reserved */
! 469: goto out;
! 470: for (i = 0; i < dch->nkeys; i++) {
! 471: if ((r = sshkey_puts(dch->keys[i], b)) != 0 ||
! 472: (r = sshbuf_put_u8(b, dch->key_is_ca[i] != 0)) != 0)
! 473: goto out;
! 474: }
! 475: if ((r = sshbuf_put_stringb(m, b)) != 0)
! 476: goto out;
! 477: /* success */
! 478: r = 0;
! 479: out:
! 480: sshbuf_free(b);
! 481: return r;
! 482: }
! 483:
! 484: static int
! 485: encode_dest_constraint(struct sshbuf *m, const struct dest_constraint *dc)
! 486: {
! 487: struct sshbuf *b;
! 488: int r;
! 489:
! 490: if ((b = sshbuf_new()) == NULL)
! 491: return SSH_ERR_ALLOC_FAIL;
! 492: if ((r = encode_dest_constraint_hop(b, &dc->from) != 0) ||
! 493: (r = encode_dest_constraint_hop(b, &dc->to) != 0) ||
! 494: (r = sshbuf_put_string(b, NULL, 0)) != 0) /* reserved */
! 495: goto out;
! 496: if ((r = sshbuf_put_stringb(m, b)) != 0)
! 497: goto out;
! 498: /* success */
! 499: r = 0;
! 500: out:
! 501: sshbuf_free(b);
! 502: return r;
! 503: }
1.22 markus 504:
1.94 djm 505: static int
1.118 djm 506: encode_constraints(struct sshbuf *m, u_int life, u_int confirm, u_int maxsign,
1.129 ! djm 507: const char *provider, struct dest_constraint **dest_constraints,
! 508: size_t ndest_constraints)
1.94 djm 509: {
510: int r;
1.129 ! djm 511: struct sshbuf *b = NULL;
! 512: size_t i;
1.94 djm 513:
514: if (life != 0) {
515: if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_LIFETIME)) != 0 ||
516: (r = sshbuf_put_u32(m, life)) != 0)
517: goto out;
518: }
519: if (confirm != 0) {
520: if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_CONFIRM)) != 0)
521: goto out;
522: }
1.108 markus 523: if (maxsign != 0) {
524: if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_MAXSIGN)) != 0 ||
525: (r = sshbuf_put_u32(m, maxsign)) != 0)
526: goto out;
527: }
1.118 djm 528: if (provider != NULL) {
529: if ((r = sshbuf_put_u8(m,
530: SSH_AGENT_CONSTRAIN_EXTENSION)) != 0 ||
531: (r = sshbuf_put_cstring(m,
532: "sk-provider@openssh.com")) != 0 ||
533: (r = sshbuf_put_cstring(m, provider)) != 0)
534: goto out;
535: }
1.129 ! djm 536: if (dest_constraints != NULL && ndest_constraints > 0) {
! 537: if ((b = sshbuf_new()) == NULL) {
! 538: r = SSH_ERR_ALLOC_FAIL;
! 539: goto out;
! 540: }
! 541: for (i = 0; i < ndest_constraints; i++) {
! 542: if ((r = encode_dest_constraint(b,
! 543: dest_constraints[i])) != 0)
! 544: goto out;
! 545: }
! 546: if ((r = sshbuf_put_u8(m,
! 547: SSH_AGENT_CONSTRAIN_EXTENSION)) != 0 ||
! 548: (r = sshbuf_put_cstring(m,
! 549: "restrict-destination-v00@openssh.com")) != 0 ||
! 550: (r = sshbuf_put_stringb(m, b)) != 0)
! 551: goto out;
! 552: }
1.94 djm 553: r = 0;
554: out:
1.129 ! djm 555: sshbuf_free(b);
1.94 djm 556: return r;
1.22 markus 557: }
558:
1.14 markus 559: /*
1.94 djm 560: * Adds an identity to the authentication server.
561: * This call is intended only for use by ssh-add(1) and like applications.
1.14 markus 562: */
1.18 markus 563: int
1.114 djm 564: ssh_add_identity_constrained(int sock, struct sshkey *key,
1.118 djm 565: const char *comment, u_int life, u_int confirm, u_int maxsign,
1.129 ! djm 566: const char *provider, struct dest_constraint **dest_constraints,
! 567: size_t ndest_constraints)
1.1 deraadt 568: {
1.94 djm 569: struct sshbuf *msg;
1.129 ! djm 570: int r, constrained = (life || confirm || maxsign ||
! 571: provider || dest_constraints);
1.94 djm 572: u_char type;
1.12 markus 573:
1.94 djm 574: if ((msg = sshbuf_new()) == NULL)
575: return SSH_ERR_ALLOC_FAIL;
1.22 markus 576:
577: switch (key->type) {
1.93 markus 578: #ifdef WITH_OPENSSL
1.22 markus 579: case KEY_RSA:
1.82 djm 580: case KEY_RSA_CERT:
1.22 markus 581: case KEY_DSA:
1.82 djm 582: case KEY_DSA_CERT:
1.84 djm 583: case KEY_ECDSA:
584: case KEY_ECDSA_CERT:
1.118 djm 585: case KEY_ECDSA_SK:
586: case KEY_ECDSA_SK_CERT:
1.93 markus 587: #endif
1.90 markus 588: case KEY_ED25519:
589: case KEY_ED25519_CERT:
1.119 markus 590: case KEY_ED25519_SK:
591: case KEY_ED25519_SK_CERT:
1.108 markus 592: case KEY_XMSS:
593: case KEY_XMSS_CERT:
1.54 markus 594: type = constrained ?
595: SSH2_AGENTC_ADD_ID_CONSTRAINED :
596: SSH2_AGENTC_ADD_IDENTITY;
1.94 djm 597: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
1.108 markus 598: (r = sshkey_private_serialize_maxsign(key, msg, maxsign,
1.125 dtucker 599: 0)) != 0 ||
1.108 markus 600: (r = sshbuf_put_cstring(msg, comment)) != 0)
1.94 djm 601: goto out;
1.22 markus 602: break;
603: default:
1.94 djm 604: r = SSH_ERR_INVALID_ARGUMENT;
605: goto out;
1.12 markus 606: }
1.94 djm 607: if (constrained &&
1.118 djm 608: (r = encode_constraints(msg, life, confirm, maxsign,
1.129 ! djm 609: provider, dest_constraints, ndest_constraints)) != 0)
1.94 djm 610: goto out;
1.127 djm 611: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 612: goto out;
1.127 djm 613: /* success */
614: r = 0;
1.94 djm 615: out:
616: sshbuf_free(msg);
617: return r;
1.54 markus 618: }
619:
1.14 markus 620: /*
1.94 djm 621: * Removes an identity from the authentication server.
622: * This call is intended only for use by ssh-add(1) and like applications.
1.14 markus 623: */
1.18 markus 624: int
1.124 djm 625: ssh_remove_identity(int sock, const struct sshkey *key)
1.1 deraadt 626: {
1.94 djm 627: struct sshbuf *msg;
628: int r;
1.127 djm 629: u_char *blob = NULL;
1.94 djm 630: size_t blen;
1.12 markus 631:
1.94 djm 632: if ((msg = sshbuf_new()) == NULL)
633: return SSH_ERR_ALLOC_FAIL;
1.12 markus 634:
1.93 markus 635: if (key->type != KEY_UNSPEC) {
1.94 djm 636: if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
637: goto out;
638: if ((r = sshbuf_put_u8(msg,
639: SSH2_AGENTC_REMOVE_IDENTITY)) != 0 ||
640: (r = sshbuf_put_string(msg, blob, blen)) != 0)
641: goto out;
1.51 markus 642: } else {
1.94 djm 643: r = SSH_ERR_INVALID_ARGUMENT;
644: goto out;
1.51 markus 645: }
1.127 djm 646: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 647: goto out;
1.127 djm 648: /* success */
649: r = 0;
1.94 djm 650: out:
1.122 jsg 651: if (blob != NULL)
652: freezero(blob, blen);
1.94 djm 653: sshbuf_free(msg);
654: return r;
1.42 markus 655: }
656:
1.94 djm 657: /*
658: * Add/remove an token-based identity from the authentication server.
659: * This call is intended only for use by ssh-add(1) and like applications.
660: */
1.42 markus 661: int
1.94 djm 662: ssh_update_card(int sock, int add, const char *reader_id, const char *pin,
1.129 ! djm 663: u_int life, u_int confirm,
! 664: struct dest_constraint **dest_constraints, size_t ndest_constraints)
1.42 markus 665: {
1.94 djm 666: struct sshbuf *msg;
667: int r, constrained = (life || confirm);
668: u_char type;
1.60 djm 669:
670: if (add) {
671: type = constrained ?
672: SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
673: SSH_AGENTC_ADD_SMARTCARD_KEY;
674: } else
675: type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
1.42 markus 676:
1.94 djm 677: if ((msg = sshbuf_new()) == NULL)
678: return SSH_ERR_ALLOC_FAIL;
679: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
680: (r = sshbuf_put_cstring(msg, reader_id)) != 0 ||
681: (r = sshbuf_put_cstring(msg, pin)) != 0)
682: goto out;
683: if (constrained &&
1.129 ! djm 684: (r = encode_constraints(msg, life, confirm, 0, NULL,
! 685: dest_constraints, ndest_constraints)) != 0)
1.94 djm 686: goto out;
1.127 djm 687: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 688: goto out;
1.127 djm 689: /* success */
690: r = 0;
1.94 djm 691: out:
692: sshbuf_free(msg);
693: return r;
1.12 markus 694: }
695:
1.14 markus 696: /*
1.94 djm 697: * Removes all identities from the agent.
698: * This call is intended only for use by ssh-add(1) and like applications.
1.102 djm 699: *
700: * This supports the SSH protocol 1 message to because, when clearing all
701: * keys from an agent, we generally want to clear both protocol v1 and v2
702: * keys.
1.14 markus 703: */
1.18 markus 704: int
1.94 djm 705: ssh_remove_all_identities(int sock, int version)
1.1 deraadt 706: {
1.94 djm 707: struct sshbuf *msg;
708: u_char type = (version == 1) ?
709: SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
710: SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
711: int r;
712:
713: if ((msg = sshbuf_new()) == NULL)
714: return SSH_ERR_ALLOC_FAIL;
715: if ((r = sshbuf_put_u8(msg, type)) != 0)
1.128 djm 716: goto out;
717: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
718: goto out;
719: /* success */
720: r = 0;
721: out:
722: sshbuf_free(msg);
723: return r;
724: }
725:
726: /* Binds a session ID to a hostkey via the initial KEX signature. */
727: int
728: ssh_agent_bind_hostkey(int sock, const struct sshkey *key,
729: const struct sshbuf *session_id, const struct sshbuf *signature,
730: int forwarding)
731: {
732: struct sshbuf *msg;
733: int r;
734:
735: if (key == NULL || session_id == NULL || signature == NULL)
736: return SSH_ERR_INVALID_ARGUMENT;
737: if ((msg = sshbuf_new()) == NULL)
738: return SSH_ERR_ALLOC_FAIL;
739: if ((r = sshbuf_put_u8(msg, SSH_AGENTC_EXTENSION)) != 0 ||
740: (r = sshbuf_put_cstring(msg, "session-bind@openssh.com")) != 0 ||
741: (r = sshkey_puts(key, msg)) != 0 ||
742: (r = sshbuf_put_stringb(msg, session_id)) != 0 ||
743: (r = sshbuf_put_stringb(msg, signature)) != 0 ||
744: (r = sshbuf_put_u8(msg, forwarding ? 1 : 0)) != 0)
1.94 djm 745: goto out;
1.127 djm 746: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 747: goto out;
1.127 djm 748: /* success */
749: r = 0;
1.94 djm 750: out:
751: sshbuf_free(msg);
752: return r;
1.12 markus 753: }
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