Annotation of src/usr.bin/ssh/authfd.c, Revision 1.130
1.130 ! dtucker 1: /* $OpenBSD: authfd.c,v 1.129 2021/12/19 22:10:24 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:
1.130 ! dtucker 94: debug3_f("path '%s'", authsocket);
1.92 tedu 95: memset(&sunaddr, 0, sizeof(sunaddr));
1.12 markus 96: sunaddr.sun_family = AF_UNIX;
97: strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
98:
1.115 deraadt 99: if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.94 djm 100: return SSH_ERR_SYSTEM_ERROR;
1.12 markus 101:
102: /* close on exec */
1.94 djm 103: if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1 ||
1.115 deraadt 104: connect(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1.94 djm 105: oerrno = errno;
1.12 markus 106: close(sock);
1.94 djm 107: errno = oerrno;
108: return SSH_ERR_SYSTEM_ERROR;
1.12 markus 109: }
1.94 djm 110: if (fdp != NULL)
111: *fdp = sock;
112: else
1.12 markus 113: close(sock);
1.94 djm 114: return 0;
1.121 djm 115: }
116:
117: /*
118: * Opens the default authentication socket and stores the file descriptor in
119: * fdp. Returns 0 on success and an error on failure.
120: */
121: int
122: ssh_get_authentication_socket(int *fdp)
123: {
124: const char *authsocket;
125:
126: if (fdp != NULL)
127: *fdp = -1;
128:
129: authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
130: if (authsocket == NULL || *authsocket == '\0')
131: return SSH_ERR_AGENT_NOT_PRESENT;
132:
133: return ssh_get_authentication_socket_path(authsocket, fdp);
1.1 deraadt 134: }
135:
1.94 djm 136: /* Communicate with agent: send request and read reply */
1.41 itojun 137: static int
1.94 djm 138: ssh_request_reply(int sock, struct sshbuf *request, struct sshbuf *reply)
1.24 markus 139: {
1.94 djm 140: int r;
141: size_t l, len;
1.24 markus 142: char buf[1024];
143:
144: /* Get the length of the message, and format it in the buffer. */
1.94 djm 145: len = sshbuf_len(request);
1.108 markus 146: POKE_U32(buf, len);
1.24 markus 147:
148: /* Send the length and then the packet to the agent. */
1.94 djm 149: if (atomicio(vwrite, sock, buf, 4) != 4 ||
1.111 markus 150: atomicio(vwrite, sock, sshbuf_mutable_ptr(request),
1.94 djm 151: sshbuf_len(request)) != sshbuf_len(request))
152: return SSH_ERR_AGENT_COMMUNICATION;
1.24 markus 153: /*
154: * Wait for response from the agent. First read the length of the
155: * response packet.
156: */
1.94 djm 157: if (atomicio(read, sock, buf, 4) != 4)
158: return SSH_ERR_AGENT_COMMUNICATION;
1.24 markus 159:
160: /* Extract the length, and check it for sanity. */
1.108 markus 161: len = PEEK_U32(buf);
1.94 djm 162: if (len > MAX_AGENT_REPLY_LEN)
163: return SSH_ERR_INVALID_FORMAT;
1.24 markus 164:
165: /* Read the rest of the response in to the buffer. */
1.94 djm 166: sshbuf_reset(reply);
1.24 markus 167: while (len > 0) {
168: l = len;
169: if (l > sizeof(buf))
170: l = sizeof(buf);
1.94 djm 171: if (atomicio(read, sock, buf, l) != l)
172: return SSH_ERR_AGENT_COMMUNICATION;
173: if ((r = sshbuf_put(reply, buf, l)) != 0)
174: return r;
1.24 markus 175: len -= l;
176: }
1.94 djm 177: return 0;
1.24 markus 178: }
179:
1.127 djm 180: /* Communicate with agent: sent request, read and decode status reply */
181: static int
182: ssh_request_reply_decode(int sock, struct sshbuf *request)
183: {
184: struct sshbuf *reply;
185: int r;
186: u_char type;
187:
188: if ((reply = sshbuf_new()) == NULL)
189: return SSH_ERR_ALLOC_FAIL;
190: if ((r = ssh_request_reply(sock, request, reply)) != 0 ||
191: (r = sshbuf_get_u8(reply, &type)) != 0 ||
192: (r = decode_reply(type)) != 0)
193: goto out;
194: /* success */
195: r = 0;
196: out:
197: sshbuf_free(reply);
198: return r;
199: }
200:
1.14 markus 201: /*
202: * Closes the agent socket if it should be closed (depends on how it was
203: * obtained). The argument must have been returned by
204: * ssh_get_authentication_socket().
205: */
1.18 markus 206: void
1.12 markus 207: ssh_close_authentication_socket(int sock)
1.1 deraadt 208: {
1.12 markus 209: if (getenv(SSH_AUTHSOCKET_ENV_NAME))
210: close(sock);
1.1 deraadt 211: }
212:
1.94 djm 213: /* Lock/unlock agent */
214: int
215: ssh_lock_agent(int sock, int lock, const char *password)
1.1 deraadt 216: {
1.94 djm 217: int r;
218: u_char type = lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK;
219: struct sshbuf *msg;
220:
221: if ((msg = sshbuf_new()) == NULL)
222: return SSH_ERR_ALLOC_FAIL;
223: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
1.127 djm 224: (r = sshbuf_put_cstring(msg, password)) != 0 ||
225: (r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 226: goto out;
1.127 djm 227: /* success */
228: r = 0;
1.94 djm 229: out:
230: sshbuf_free(msg);
231: return r;
1.1 deraadt 232: }
233:
1.50 markus 234:
1.94 djm 235: static int
236: deserialise_identity2(struct sshbuf *ids, struct sshkey **keyp, char **commentp)
1.50 markus 237: {
1.94 djm 238: int r;
239: char *comment = NULL;
240: const u_char *blob;
241: size_t blen;
242:
243: if ((r = sshbuf_get_string_direct(ids, &blob, &blen)) != 0 ||
244: (r = sshbuf_get_cstring(ids, &comment, NULL)) != 0)
245: goto out;
246: if ((r = sshkey_from_blob(blob, blen, keyp)) != 0)
247: goto out;
248: if (commentp != NULL) {
249: *commentp = comment;
250: comment = NULL;
251: }
252: r = 0;
253: out:
254: free(comment);
255: return r;
1.1 deraadt 256: }
257:
1.14 markus 258: /*
1.94 djm 259: * Fetch list of identities held by the agent.
1.14 markus 260: */
1.30 markus 261: int
1.103 naddy 262: ssh_fetch_identitylist(int sock, struct ssh_identitylist **idlp)
1.1 deraadt 263: {
1.103 naddy 264: u_char type;
1.94 djm 265: u_int32_t num, i;
266: struct sshbuf *msg;
267: struct ssh_identitylist *idl = NULL;
268: int r;
1.25 markus 269:
1.14 markus 270: /*
271: * Send a message to the agent requesting for a list of the
272: * identities it can represent.
273: */
1.94 djm 274: if ((msg = sshbuf_new()) == NULL)
275: return SSH_ERR_ALLOC_FAIL;
1.103 naddy 276: if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_REQUEST_IDENTITIES)) != 0)
1.94 djm 277: goto out;
1.12 markus 278:
1.94 djm 279: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
280: goto out;
1.1 deraadt 281:
1.12 markus 282: /* Get message type, and verify that we got a proper answer. */
1.94 djm 283: if ((r = sshbuf_get_u8(msg, &type)) != 0)
284: goto out;
1.29 markus 285: if (agent_failed(type)) {
1.94 djm 286: r = SSH_ERR_AGENT_FAILURE;
287: goto out;
1.103 naddy 288: } else if (type != SSH2_AGENT_IDENTITIES_ANSWER) {
1.94 djm 289: r = SSH_ERR_INVALID_FORMAT;
290: goto out;
1.25 markus 291: }
1.12 markus 292:
293: /* Get the number of entries in the response and check it for sanity. */
1.94 djm 294: if ((r = sshbuf_get_u32(msg, &num)) != 0)
295: goto out;
296: if (num > MAX_AGENT_IDENTITIES) {
297: r = SSH_ERR_INVALID_FORMAT;
298: goto out;
299: }
300: if (num == 0) {
301: r = SSH_ERR_AGENT_NO_IDENTITIES;
302: goto out;
303: }
304:
305: /* Deserialise the response into a list of keys/comments */
306: if ((idl = calloc(1, sizeof(*idl))) == NULL ||
307: (idl->keys = calloc(num, sizeof(*idl->keys))) == NULL ||
308: (idl->comments = calloc(num, sizeof(*idl->comments))) == NULL) {
309: r = SSH_ERR_ALLOC_FAIL;
310: goto out;
311: }
312: for (i = 0; i < num;) {
1.103 naddy 313: if ((r = deserialise_identity2(msg, &(idl->keys[i]),
314: &(idl->comments[i]))) != 0) {
315: if (r == SSH_ERR_KEY_TYPE_UNKNOWN) {
316: /* Gracefully skip unknown key types */
317: num--;
318: continue;
319: } else
320: goto out;
1.94 djm 321: }
322: i++;
323: }
324: idl->nkeys = num;
325: *idlp = idl;
326: idl = NULL;
327: r = 0;
328: out:
329: sshbuf_free(msg);
330: if (idl != NULL)
331: ssh_free_identitylist(idl);
332: return r;
1.30 markus 333: }
334:
1.94 djm 335: void
336: ssh_free_identitylist(struct ssh_identitylist *idl)
1.30 markus 337: {
1.94 djm 338: size_t i;
1.1 deraadt 339:
1.94 djm 340: if (idl == NULL)
341: return;
342: for (i = 0; i < idl->nkeys; i++) {
343: if (idl->keys != NULL)
344: sshkey_free(idl->keys[i]);
345: if (idl->comments != NULL)
346: free(idl->comments[i]);
1.25 markus 347: }
1.116 djm 348: free(idl->keys);
349: free(idl->comments);
1.94 djm 350: free(idl);
1.117 djm 351: }
352:
353: /*
354: * Check if the ssh agent has a given key.
355: * Returns 0 if found, or a negative SSH_ERR_* error code on failure.
356: */
357: int
1.124 djm 358: ssh_agent_has_key(int sock, const struct sshkey *key)
1.117 djm 359: {
360: int r, ret = SSH_ERR_KEY_NOT_FOUND;
361: size_t i;
362: struct ssh_identitylist *idlist = NULL;
363:
1.123 markus 364: if ((r = ssh_fetch_identitylist(sock, &idlist)) != 0) {
1.117 djm 365: return r;
366: }
367:
368: for (i = 0; i < idlist->nkeys; i++) {
369: if (sshkey_equal_public(idlist->keys[i], key)) {
370: ret = 0;
371: break;
372: }
373: }
374:
375: ssh_free_identitylist(idlist);
376: return ret;
1.1 deraadt 377: }
378:
1.14 markus 379: /*
1.94 djm 380: * Sends a challenge (typically from a server via ssh(1)) to the agent,
381: * and waits for a response from the agent.
382: * Returns true (non-zero) if the agent gave the correct answer, zero
383: * otherwise.
1.14 markus 384: */
1.1 deraadt 385:
386:
1.109 djm 387: /* encode signature algorithm in flag bits, so we can keep the msg format */
1.100 markus 388: static u_int
1.104 djm 389: agent_encode_alg(const struct sshkey *key, const char *alg)
1.100 markus 390: {
1.113 djm 391: if (alg != NULL && sshkey_type_plain(key->type) == KEY_RSA) {
392: if (strcmp(alg, "rsa-sha2-256") == 0 ||
393: strcmp(alg, "rsa-sha2-256-cert-v01@openssh.com") == 0)
1.100 markus 394: return SSH_AGENT_RSA_SHA2_256;
1.113 djm 395: if (strcmp(alg, "rsa-sha2-512") == 0 ||
396: strcmp(alg, "rsa-sha2-512-cert-v01@openssh.com") == 0)
1.100 markus 397: return SSH_AGENT_RSA_SHA2_512;
398: }
399: return 0;
400: }
401:
1.94 djm 402: /* ask agent to sign data, returns err.h code on error, 0 on success */
1.25 markus 403: int
1.104 djm 404: ssh_agent_sign(int sock, const struct sshkey *key,
1.94 djm 405: u_char **sigp, size_t *lenp,
1.100 markus 406: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.94 djm 407: {
408: struct sshbuf *msg;
1.110 djm 409: u_char *sig = NULL, type = 0;
410: size_t len = 0;
1.94 djm 411: u_int flags = 0;
412: int r = SSH_ERR_INTERNAL_ERROR;
413:
1.97 markus 414: *sigp = NULL;
415: *lenp = 0;
1.94 djm 416:
417: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
418: return SSH_ERR_INVALID_ARGUMENT;
419: if ((msg = sshbuf_new()) == NULL)
420: return SSH_ERR_ALLOC_FAIL;
1.100 markus 421: flags |= agent_encode_alg(key, alg);
1.94 djm 422: if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 ||
1.110 djm 423: (r = sshkey_puts(key, msg)) != 0 ||
1.94 djm 424: (r = sshbuf_put_string(msg, data, datalen)) != 0 ||
425: (r = sshbuf_put_u32(msg, flags)) != 0)
426: goto out;
1.99 jsg 427: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
1.94 djm 428: goto out;
429: if ((r = sshbuf_get_u8(msg, &type)) != 0)
430: goto out;
1.29 markus 431: if (agent_failed(type)) {
1.94 djm 432: r = SSH_ERR_AGENT_FAILURE;
433: goto out;
1.25 markus 434: } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
1.94 djm 435: r = SSH_ERR_INVALID_FORMAT;
436: goto out;
437: }
1.110 djm 438: if ((r = sshbuf_get_string(msg, &sig, &len)) != 0)
439: goto out;
440: /* Check what we actually got back from the agent. */
441: if ((r = sshkey_check_sigtype(sig, len, alg)) != 0)
1.94 djm 442: goto out;
1.110 djm 443: /* success */
444: *sigp = sig;
1.97 markus 445: *lenp = len;
1.110 djm 446: sig = NULL;
447: len = 0;
1.94 djm 448: r = 0;
449: out:
1.110 djm 450: freezero(sig, len);
1.94 djm 451: sshbuf_free(msg);
452: return r;
1.25 markus 453: }
454:
1.22 markus 455: /* Encode key for a message to the agent. */
456:
1.129 djm 457: static int
458: encode_dest_constraint_hop(struct sshbuf *m,
459: const struct dest_constraint_hop *dch)
460: {
461: struct sshbuf *b;
462: u_int i;
463: int r;
464:
465: if ((b = sshbuf_new()) == NULL)
466: return SSH_ERR_ALLOC_FAIL;
467: if ((r = sshbuf_put_cstring(b, dch->user)) != 0 ||
468: (r = sshbuf_put_cstring(b, dch->hostname)) != 0 ||
469: (r = sshbuf_put_string(b, NULL, 0)) != 0) /* reserved */
470: goto out;
471: for (i = 0; i < dch->nkeys; i++) {
472: if ((r = sshkey_puts(dch->keys[i], b)) != 0 ||
473: (r = sshbuf_put_u8(b, dch->key_is_ca[i] != 0)) != 0)
474: goto out;
475: }
476: if ((r = sshbuf_put_stringb(m, b)) != 0)
477: goto out;
478: /* success */
479: r = 0;
480: out:
481: sshbuf_free(b);
482: return r;
483: }
484:
485: static int
486: encode_dest_constraint(struct sshbuf *m, const struct dest_constraint *dc)
487: {
488: struct sshbuf *b;
489: int r;
490:
491: if ((b = sshbuf_new()) == NULL)
492: return SSH_ERR_ALLOC_FAIL;
493: if ((r = encode_dest_constraint_hop(b, &dc->from) != 0) ||
494: (r = encode_dest_constraint_hop(b, &dc->to) != 0) ||
495: (r = sshbuf_put_string(b, NULL, 0)) != 0) /* reserved */
496: goto out;
497: if ((r = sshbuf_put_stringb(m, b)) != 0)
498: goto out;
499: /* success */
500: r = 0;
501: out:
502: sshbuf_free(b);
503: return r;
504: }
1.22 markus 505:
1.94 djm 506: static int
1.118 djm 507: encode_constraints(struct sshbuf *m, u_int life, u_int confirm, u_int maxsign,
1.129 djm 508: const char *provider, struct dest_constraint **dest_constraints,
509: size_t ndest_constraints)
1.94 djm 510: {
511: int r;
1.129 djm 512: struct sshbuf *b = NULL;
513: size_t i;
1.94 djm 514:
515: if (life != 0) {
516: if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_LIFETIME)) != 0 ||
517: (r = sshbuf_put_u32(m, life)) != 0)
518: goto out;
519: }
520: if (confirm != 0) {
521: if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_CONFIRM)) != 0)
522: goto out;
523: }
1.108 markus 524: if (maxsign != 0) {
525: if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_MAXSIGN)) != 0 ||
526: (r = sshbuf_put_u32(m, maxsign)) != 0)
527: goto out;
528: }
1.118 djm 529: if (provider != NULL) {
530: if ((r = sshbuf_put_u8(m,
531: SSH_AGENT_CONSTRAIN_EXTENSION)) != 0 ||
532: (r = sshbuf_put_cstring(m,
533: "sk-provider@openssh.com")) != 0 ||
534: (r = sshbuf_put_cstring(m, provider)) != 0)
535: goto out;
536: }
1.129 djm 537: if (dest_constraints != NULL && ndest_constraints > 0) {
538: if ((b = sshbuf_new()) == NULL) {
539: r = SSH_ERR_ALLOC_FAIL;
540: goto out;
541: }
542: for (i = 0; i < ndest_constraints; i++) {
543: if ((r = encode_dest_constraint(b,
544: dest_constraints[i])) != 0)
545: goto out;
546: }
547: if ((r = sshbuf_put_u8(m,
548: SSH_AGENT_CONSTRAIN_EXTENSION)) != 0 ||
549: (r = sshbuf_put_cstring(m,
550: "restrict-destination-v00@openssh.com")) != 0 ||
551: (r = sshbuf_put_stringb(m, b)) != 0)
552: goto out;
553: }
1.94 djm 554: r = 0;
555: out:
1.129 djm 556: sshbuf_free(b);
1.94 djm 557: return r;
1.22 markus 558: }
559:
1.14 markus 560: /*
1.94 djm 561: * Adds an identity to the authentication server.
562: * This call is intended only for use by ssh-add(1) and like applications.
1.14 markus 563: */
1.18 markus 564: int
1.114 djm 565: ssh_add_identity_constrained(int sock, struct sshkey *key,
1.118 djm 566: const char *comment, u_int life, u_int confirm, u_int maxsign,
1.129 djm 567: const char *provider, struct dest_constraint **dest_constraints,
568: size_t ndest_constraints)
1.1 deraadt 569: {
1.94 djm 570: struct sshbuf *msg;
1.129 djm 571: int r, constrained = (life || confirm || maxsign ||
572: provider || dest_constraints);
1.94 djm 573: u_char type;
1.12 markus 574:
1.94 djm 575: if ((msg = sshbuf_new()) == NULL)
576: return SSH_ERR_ALLOC_FAIL;
1.22 markus 577:
578: switch (key->type) {
1.93 markus 579: #ifdef WITH_OPENSSL
1.22 markus 580: case KEY_RSA:
1.82 djm 581: case KEY_RSA_CERT:
1.22 markus 582: case KEY_DSA:
1.82 djm 583: case KEY_DSA_CERT:
1.84 djm 584: case KEY_ECDSA:
585: case KEY_ECDSA_CERT:
1.118 djm 586: case KEY_ECDSA_SK:
587: case KEY_ECDSA_SK_CERT:
1.93 markus 588: #endif
1.90 markus 589: case KEY_ED25519:
590: case KEY_ED25519_CERT:
1.119 markus 591: case KEY_ED25519_SK:
592: case KEY_ED25519_SK_CERT:
1.108 markus 593: case KEY_XMSS:
594: case KEY_XMSS_CERT:
1.54 markus 595: type = constrained ?
596: SSH2_AGENTC_ADD_ID_CONSTRAINED :
597: SSH2_AGENTC_ADD_IDENTITY;
1.94 djm 598: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
1.108 markus 599: (r = sshkey_private_serialize_maxsign(key, msg, maxsign,
1.125 dtucker 600: 0)) != 0 ||
1.108 markus 601: (r = sshbuf_put_cstring(msg, comment)) != 0)
1.94 djm 602: goto out;
1.22 markus 603: break;
604: default:
1.94 djm 605: r = SSH_ERR_INVALID_ARGUMENT;
606: goto out;
1.12 markus 607: }
1.94 djm 608: if (constrained &&
1.118 djm 609: (r = encode_constraints(msg, life, confirm, maxsign,
1.129 djm 610: provider, dest_constraints, ndest_constraints)) != 0)
1.94 djm 611: goto out;
1.127 djm 612: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 613: goto out;
1.127 djm 614: /* success */
615: r = 0;
1.94 djm 616: out:
617: sshbuf_free(msg);
618: return r;
1.54 markus 619: }
620:
1.14 markus 621: /*
1.94 djm 622: * Removes an identity from the authentication server.
623: * This call is intended only for use by ssh-add(1) and like applications.
1.14 markus 624: */
1.18 markus 625: int
1.124 djm 626: ssh_remove_identity(int sock, const struct sshkey *key)
1.1 deraadt 627: {
1.94 djm 628: struct sshbuf *msg;
629: int r;
1.127 djm 630: u_char *blob = NULL;
1.94 djm 631: size_t blen;
1.12 markus 632:
1.94 djm 633: if ((msg = sshbuf_new()) == NULL)
634: return SSH_ERR_ALLOC_FAIL;
1.12 markus 635:
1.93 markus 636: if (key->type != KEY_UNSPEC) {
1.94 djm 637: if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
638: goto out;
639: if ((r = sshbuf_put_u8(msg,
640: SSH2_AGENTC_REMOVE_IDENTITY)) != 0 ||
641: (r = sshbuf_put_string(msg, blob, blen)) != 0)
642: goto out;
1.51 markus 643: } else {
1.94 djm 644: r = SSH_ERR_INVALID_ARGUMENT;
645: goto out;
1.51 markus 646: }
1.127 djm 647: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 648: goto out;
1.127 djm 649: /* success */
650: r = 0;
1.94 djm 651: out:
1.122 jsg 652: if (blob != NULL)
653: freezero(blob, blen);
1.94 djm 654: sshbuf_free(msg);
655: return r;
1.42 markus 656: }
657:
1.94 djm 658: /*
659: * Add/remove an token-based identity from the authentication server.
660: * This call is intended only for use by ssh-add(1) and like applications.
661: */
1.42 markus 662: int
1.94 djm 663: ssh_update_card(int sock, int add, const char *reader_id, const char *pin,
1.129 djm 664: u_int life, u_int confirm,
665: struct dest_constraint **dest_constraints, size_t ndest_constraints)
1.42 markus 666: {
1.94 djm 667: struct sshbuf *msg;
668: int r, constrained = (life || confirm);
669: u_char type;
1.60 djm 670:
671: if (add) {
672: type = constrained ?
673: SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
674: SSH_AGENTC_ADD_SMARTCARD_KEY;
675: } else
676: type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
1.42 markus 677:
1.94 djm 678: if ((msg = sshbuf_new()) == NULL)
679: return SSH_ERR_ALLOC_FAIL;
680: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
681: (r = sshbuf_put_cstring(msg, reader_id)) != 0 ||
682: (r = sshbuf_put_cstring(msg, pin)) != 0)
683: goto out;
684: if (constrained &&
1.129 djm 685: (r = encode_constraints(msg, life, confirm, 0, NULL,
686: dest_constraints, ndest_constraints)) != 0)
1.94 djm 687: goto out;
1.127 djm 688: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 689: goto out;
1.127 djm 690: /* success */
691: r = 0;
1.94 djm 692: out:
693: sshbuf_free(msg);
694: return r;
1.12 markus 695: }
696:
1.14 markus 697: /*
1.94 djm 698: * Removes all identities from the agent.
699: * This call is intended only for use by ssh-add(1) and like applications.
1.102 djm 700: *
701: * This supports the SSH protocol 1 message to because, when clearing all
702: * keys from an agent, we generally want to clear both protocol v1 and v2
703: * keys.
1.14 markus 704: */
1.18 markus 705: int
1.94 djm 706: ssh_remove_all_identities(int sock, int version)
1.1 deraadt 707: {
1.94 djm 708: struct sshbuf *msg;
709: u_char type = (version == 1) ?
710: SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
711: SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
712: int r;
713:
714: if ((msg = sshbuf_new()) == NULL)
715: return SSH_ERR_ALLOC_FAIL;
716: if ((r = sshbuf_put_u8(msg, type)) != 0)
1.128 djm 717: goto out;
718: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
719: goto out;
720: /* success */
721: r = 0;
722: out:
723: sshbuf_free(msg);
724: return r;
725: }
726:
727: /* Binds a session ID to a hostkey via the initial KEX signature. */
728: int
729: ssh_agent_bind_hostkey(int sock, const struct sshkey *key,
730: const struct sshbuf *session_id, const struct sshbuf *signature,
731: int forwarding)
732: {
733: struct sshbuf *msg;
734: int r;
735:
736: if (key == NULL || session_id == NULL || signature == NULL)
737: return SSH_ERR_INVALID_ARGUMENT;
738: if ((msg = sshbuf_new()) == NULL)
739: return SSH_ERR_ALLOC_FAIL;
740: if ((r = sshbuf_put_u8(msg, SSH_AGENTC_EXTENSION)) != 0 ||
741: (r = sshbuf_put_cstring(msg, "session-bind@openssh.com")) != 0 ||
742: (r = sshkey_puts(key, msg)) != 0 ||
743: (r = sshbuf_put_stringb(msg, session_id)) != 0 ||
744: (r = sshbuf_put_stringb(msg, signature)) != 0 ||
745: (r = sshbuf_put_u8(msg, forwarding ? 1 : 0)) != 0)
1.94 djm 746: goto out;
1.127 djm 747: if ((r = ssh_request_reply_decode(sock, msg)) != 0)
1.94 djm 748: goto out;
1.127 djm 749: /* success */
750: r = 0;
1.94 djm 751: out:
752: sshbuf_free(msg);
753: return r;
1.12 markus 754: }