Annotation of src/usr.bin/ssh/authfd.c, Revision 1.120
1.120 ! deraadt 1: /* $OpenBSD: authfd.c,v 1.119 2019/11/12 19:33:08 markus 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 */
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:
1.1 deraadt 84: /* Returns the number of the authentication fd, or -1 if there is none. */
1.2 provos 85: int
1.94 djm 86: ssh_get_authentication_socket(int *fdp)
1.1 deraadt 87: {
1.12 markus 88: const char *authsocket;
1.94 djm 89: int sock, oerrno;
1.12 markus 90: struct sockaddr_un sunaddr;
91:
1.94 djm 92: if (fdp != NULL)
93: *fdp = -1;
94:
1.12 markus 95: authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
1.112 djm 96: if (authsocket == NULL || *authsocket == '\0')
1.94 djm 97: return SSH_ERR_AGENT_NOT_PRESENT;
1.12 markus 98:
1.92 tedu 99: memset(&sunaddr, 0, sizeof(sunaddr));
1.12 markus 100: sunaddr.sun_family = AF_UNIX;
101: strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
102:
1.115 deraadt 103: if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.94 djm 104: return SSH_ERR_SYSTEM_ERROR;
1.12 markus 105:
106: /* close on exec */
1.94 djm 107: if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1 ||
1.115 deraadt 108: connect(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1.94 djm 109: oerrno = errno;
1.12 markus 110: close(sock);
1.94 djm 111: errno = oerrno;
112: return SSH_ERR_SYSTEM_ERROR;
1.12 markus 113: }
1.94 djm 114: if (fdp != NULL)
115: *fdp = sock;
116: else
1.12 markus 117: close(sock);
1.94 djm 118: return 0;
1.1 deraadt 119: }
120:
1.94 djm 121: /* Communicate with agent: send request and read reply */
1.41 itojun 122: static int
1.94 djm 123: ssh_request_reply(int sock, struct sshbuf *request, struct sshbuf *reply)
1.24 markus 124: {
1.94 djm 125: int r;
126: size_t l, len;
1.24 markus 127: char buf[1024];
128:
129: /* Get the length of the message, and format it in the buffer. */
1.94 djm 130: len = sshbuf_len(request);
1.108 markus 131: POKE_U32(buf, len);
1.24 markus 132:
133: /* Send the length and then the packet to the agent. */
1.94 djm 134: if (atomicio(vwrite, sock, buf, 4) != 4 ||
1.111 markus 135: atomicio(vwrite, sock, sshbuf_mutable_ptr(request),
1.94 djm 136: sshbuf_len(request)) != sshbuf_len(request))
137: return SSH_ERR_AGENT_COMMUNICATION;
1.24 markus 138: /*
139: * Wait for response from the agent. First read the length of the
140: * response packet.
141: */
1.94 djm 142: if (atomicio(read, sock, buf, 4) != 4)
143: return SSH_ERR_AGENT_COMMUNICATION;
1.24 markus 144:
145: /* Extract the length, and check it for sanity. */
1.108 markus 146: len = PEEK_U32(buf);
1.94 djm 147: if (len > MAX_AGENT_REPLY_LEN)
148: return SSH_ERR_INVALID_FORMAT;
1.24 markus 149:
150: /* Read the rest of the response in to the buffer. */
1.94 djm 151: sshbuf_reset(reply);
1.24 markus 152: while (len > 0) {
153: l = len;
154: if (l > sizeof(buf))
155: l = sizeof(buf);
1.94 djm 156: if (atomicio(read, sock, buf, l) != l)
157: return SSH_ERR_AGENT_COMMUNICATION;
158: if ((r = sshbuf_put(reply, buf, l)) != 0)
159: return r;
1.24 markus 160: len -= l;
161: }
1.94 djm 162: return 0;
1.24 markus 163: }
164:
1.14 markus 165: /*
166: * Closes the agent socket if it should be closed (depends on how it was
167: * obtained). The argument must have been returned by
168: * ssh_get_authentication_socket().
169: */
1.18 markus 170: void
1.12 markus 171: ssh_close_authentication_socket(int sock)
1.1 deraadt 172: {
1.12 markus 173: if (getenv(SSH_AUTHSOCKET_ENV_NAME))
174: close(sock);
1.1 deraadt 175: }
176:
1.94 djm 177: /* Lock/unlock agent */
178: int
179: ssh_lock_agent(int sock, int lock, const char *password)
1.1 deraadt 180: {
1.94 djm 181: int r;
182: u_char type = lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK;
183: struct sshbuf *msg;
184:
185: if ((msg = sshbuf_new()) == NULL)
186: return SSH_ERR_ALLOC_FAIL;
187: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
188: (r = sshbuf_put_cstring(msg, password)) != 0)
189: goto out;
190: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
191: goto out;
192: if ((r = sshbuf_get_u8(msg, &type)) != 0)
193: goto out;
194: r = decode_reply(type);
195: out:
196: sshbuf_free(msg);
197: return r;
1.1 deraadt 198: }
199:
1.50 markus 200:
1.94 djm 201: static int
202: deserialise_identity2(struct sshbuf *ids, struct sshkey **keyp, char **commentp)
1.50 markus 203: {
1.94 djm 204: int r;
205: char *comment = NULL;
206: const u_char *blob;
207: size_t blen;
208:
209: if ((r = sshbuf_get_string_direct(ids, &blob, &blen)) != 0 ||
210: (r = sshbuf_get_cstring(ids, &comment, NULL)) != 0)
211: goto out;
212: if ((r = sshkey_from_blob(blob, blen, keyp)) != 0)
213: goto out;
214: if (commentp != NULL) {
215: *commentp = comment;
216: comment = NULL;
217: }
218: r = 0;
219: out:
220: free(comment);
221: return r;
1.1 deraadt 222: }
223:
1.14 markus 224: /*
1.94 djm 225: * Fetch list of identities held by the agent.
1.14 markus 226: */
1.30 markus 227: int
1.103 naddy 228: ssh_fetch_identitylist(int sock, struct ssh_identitylist **idlp)
1.1 deraadt 229: {
1.103 naddy 230: u_char type;
1.94 djm 231: u_int32_t num, i;
232: struct sshbuf *msg;
233: struct ssh_identitylist *idl = NULL;
234: int r;
1.25 markus 235:
1.14 markus 236: /*
237: * Send a message to the agent requesting for a list of the
238: * identities it can represent.
239: */
1.94 djm 240: if ((msg = sshbuf_new()) == NULL)
241: return SSH_ERR_ALLOC_FAIL;
1.103 naddy 242: if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_REQUEST_IDENTITIES)) != 0)
1.94 djm 243: goto out;
1.12 markus 244:
1.94 djm 245: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
246: goto out;
1.1 deraadt 247:
1.12 markus 248: /* Get message type, and verify that we got a proper answer. */
1.94 djm 249: if ((r = sshbuf_get_u8(msg, &type)) != 0)
250: goto out;
1.29 markus 251: if (agent_failed(type)) {
1.94 djm 252: r = SSH_ERR_AGENT_FAILURE;
253: goto out;
1.103 naddy 254: } else if (type != SSH2_AGENT_IDENTITIES_ANSWER) {
1.94 djm 255: r = SSH_ERR_INVALID_FORMAT;
256: goto out;
1.25 markus 257: }
1.12 markus 258:
259: /* Get the number of entries in the response and check it for sanity. */
1.94 djm 260: if ((r = sshbuf_get_u32(msg, &num)) != 0)
261: goto out;
262: if (num > MAX_AGENT_IDENTITIES) {
263: r = SSH_ERR_INVALID_FORMAT;
264: goto out;
265: }
266: if (num == 0) {
267: r = SSH_ERR_AGENT_NO_IDENTITIES;
268: goto out;
269: }
270:
271: /* Deserialise the response into a list of keys/comments */
272: if ((idl = calloc(1, sizeof(*idl))) == NULL ||
273: (idl->keys = calloc(num, sizeof(*idl->keys))) == NULL ||
274: (idl->comments = calloc(num, sizeof(*idl->comments))) == NULL) {
275: r = SSH_ERR_ALLOC_FAIL;
276: goto out;
277: }
278: for (i = 0; i < num;) {
1.103 naddy 279: if ((r = deserialise_identity2(msg, &(idl->keys[i]),
280: &(idl->comments[i]))) != 0) {
281: if (r == SSH_ERR_KEY_TYPE_UNKNOWN) {
282: /* Gracefully skip unknown key types */
283: num--;
284: continue;
285: } else
286: goto out;
1.94 djm 287: }
288: i++;
289: }
290: idl->nkeys = num;
291: *idlp = idl;
292: idl = NULL;
293: r = 0;
294: out:
295: sshbuf_free(msg);
296: if (idl != NULL)
297: ssh_free_identitylist(idl);
298: return r;
1.30 markus 299: }
300:
1.94 djm 301: void
302: ssh_free_identitylist(struct ssh_identitylist *idl)
1.30 markus 303: {
1.94 djm 304: size_t i;
1.1 deraadt 305:
1.94 djm 306: if (idl == NULL)
307: return;
308: for (i = 0; i < idl->nkeys; i++) {
309: if (idl->keys != NULL)
310: sshkey_free(idl->keys[i]);
311: if (idl->comments != NULL)
312: free(idl->comments[i]);
1.25 markus 313: }
1.116 djm 314: free(idl->keys);
315: free(idl->comments);
1.94 djm 316: free(idl);
1.117 djm 317: }
318:
319: /*
320: * Check if the ssh agent has a given key.
321: * Returns 0 if found, or a negative SSH_ERR_* error code on failure.
322: */
323: int
324: ssh_agent_has_key(int sock, struct sshkey *key)
325: {
326: int r, ret = SSH_ERR_KEY_NOT_FOUND;
327: size_t i;
328: struct ssh_identitylist *idlist = NULL;
329:
330: if ((r = ssh_fetch_identitylist(sock, &idlist)) < 0) {
331: return r;
332: }
333:
334: for (i = 0; i < idlist->nkeys; i++) {
335: if (sshkey_equal_public(idlist->keys[i], key)) {
336: ret = 0;
337: break;
338: }
339: }
340:
341: ssh_free_identitylist(idlist);
342: return ret;
1.1 deraadt 343: }
344:
1.14 markus 345: /*
1.94 djm 346: * Sends a challenge (typically from a server via ssh(1)) to the agent,
347: * and waits for a response from the agent.
348: * Returns true (non-zero) if the agent gave the correct answer, zero
349: * otherwise.
1.14 markus 350: */
1.1 deraadt 351:
352:
1.109 djm 353: /* encode signature algorithm in flag bits, so we can keep the msg format */
1.100 markus 354: static u_int
1.104 djm 355: agent_encode_alg(const struct sshkey *key, const char *alg)
1.100 markus 356: {
1.113 djm 357: if (alg != NULL && sshkey_type_plain(key->type) == KEY_RSA) {
358: if (strcmp(alg, "rsa-sha2-256") == 0 ||
359: strcmp(alg, "rsa-sha2-256-cert-v01@openssh.com") == 0)
1.100 markus 360: return SSH_AGENT_RSA_SHA2_256;
1.113 djm 361: if (strcmp(alg, "rsa-sha2-512") == 0 ||
362: strcmp(alg, "rsa-sha2-512-cert-v01@openssh.com") == 0)
1.100 markus 363: return SSH_AGENT_RSA_SHA2_512;
364: }
365: return 0;
366: }
367:
1.94 djm 368: /* ask agent to sign data, returns err.h code on error, 0 on success */
1.25 markus 369: int
1.104 djm 370: ssh_agent_sign(int sock, const struct sshkey *key,
1.94 djm 371: u_char **sigp, size_t *lenp,
1.100 markus 372: const u_char *data, size_t datalen, const char *alg, u_int compat)
1.94 djm 373: {
374: struct sshbuf *msg;
1.110 djm 375: u_char *sig = NULL, type = 0;
376: size_t len = 0;
1.94 djm 377: u_int flags = 0;
378: int r = SSH_ERR_INTERNAL_ERROR;
379:
1.97 markus 380: *sigp = NULL;
381: *lenp = 0;
1.94 djm 382:
383: if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
384: return SSH_ERR_INVALID_ARGUMENT;
385: if ((msg = sshbuf_new()) == NULL)
386: return SSH_ERR_ALLOC_FAIL;
1.100 markus 387: flags |= agent_encode_alg(key, alg);
1.94 djm 388: if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 ||
1.110 djm 389: (r = sshkey_puts(key, msg)) != 0 ||
1.94 djm 390: (r = sshbuf_put_string(msg, data, datalen)) != 0 ||
391: (r = sshbuf_put_u32(msg, flags)) != 0)
392: goto out;
1.99 jsg 393: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
1.94 djm 394: goto out;
395: if ((r = sshbuf_get_u8(msg, &type)) != 0)
396: goto out;
1.29 markus 397: if (agent_failed(type)) {
1.94 djm 398: r = SSH_ERR_AGENT_FAILURE;
399: goto out;
1.25 markus 400: } else if (type != SSH2_AGENT_SIGN_RESPONSE) {
1.94 djm 401: r = SSH_ERR_INVALID_FORMAT;
402: goto out;
403: }
1.110 djm 404: if ((r = sshbuf_get_string(msg, &sig, &len)) != 0)
405: goto out;
406: /* Check what we actually got back from the agent. */
407: if ((r = sshkey_check_sigtype(sig, len, alg)) != 0)
1.94 djm 408: goto out;
1.110 djm 409: /* success */
410: *sigp = sig;
1.97 markus 411: *lenp = len;
1.110 djm 412: sig = NULL;
413: len = 0;
1.94 djm 414: r = 0;
415: out:
1.110 djm 416: freezero(sig, len);
1.94 djm 417: sshbuf_free(msg);
418: return r;
1.25 markus 419: }
420:
1.22 markus 421: /* Encode key for a message to the agent. */
422:
423:
1.94 djm 424: static int
1.118 djm 425: encode_constraints(struct sshbuf *m, u_int life, u_int confirm, u_int maxsign,
426: const char *provider)
1.94 djm 427: {
428: int r;
429:
430: if (life != 0) {
431: if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_LIFETIME)) != 0 ||
432: (r = sshbuf_put_u32(m, life)) != 0)
433: goto out;
434: }
435: if (confirm != 0) {
436: if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_CONFIRM)) != 0)
437: goto out;
438: }
1.108 markus 439: if (maxsign != 0) {
440: if ((r = sshbuf_put_u8(m, SSH_AGENT_CONSTRAIN_MAXSIGN)) != 0 ||
441: (r = sshbuf_put_u32(m, maxsign)) != 0)
442: goto out;
443: }
1.118 djm 444: if (provider != NULL) {
445: if ((r = sshbuf_put_u8(m,
446: SSH_AGENT_CONSTRAIN_EXTENSION)) != 0 ||
447: (r = sshbuf_put_cstring(m,
448: "sk-provider@openssh.com")) != 0 ||
449: (r = sshbuf_put_cstring(m, provider)) != 0)
450: goto out;
451: }
1.94 djm 452: r = 0;
453: out:
454: return r;
1.22 markus 455: }
456:
1.14 markus 457: /*
1.94 djm 458: * Adds an identity to the authentication server.
459: * This call is intended only for use by ssh-add(1) and like applications.
1.14 markus 460: */
1.18 markus 461: int
1.114 djm 462: ssh_add_identity_constrained(int sock, struct sshkey *key,
1.118 djm 463: const char *comment, u_int life, u_int confirm, u_int maxsign,
464: const char *provider)
1.1 deraadt 465: {
1.94 djm 466: struct sshbuf *msg;
1.118 djm 467: int r, constrained = (life || confirm || maxsign || provider);
1.94 djm 468: u_char type;
1.12 markus 469:
1.94 djm 470: if ((msg = sshbuf_new()) == NULL)
471: return SSH_ERR_ALLOC_FAIL;
1.22 markus 472:
473: switch (key->type) {
1.93 markus 474: #ifdef WITH_OPENSSL
1.22 markus 475: case KEY_RSA:
1.82 djm 476: case KEY_RSA_CERT:
1.22 markus 477: case KEY_DSA:
1.82 djm 478: case KEY_DSA_CERT:
1.84 djm 479: case KEY_ECDSA:
480: case KEY_ECDSA_CERT:
1.118 djm 481: case KEY_ECDSA_SK:
482: case KEY_ECDSA_SK_CERT:
1.93 markus 483: #endif
1.90 markus 484: case KEY_ED25519:
485: case KEY_ED25519_CERT:
1.119 markus 486: case KEY_ED25519_SK:
487: case KEY_ED25519_SK_CERT:
1.108 markus 488: case KEY_XMSS:
489: case KEY_XMSS_CERT:
1.54 markus 490: type = constrained ?
491: SSH2_AGENTC_ADD_ID_CONSTRAINED :
492: SSH2_AGENTC_ADD_IDENTITY;
1.94 djm 493: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
1.108 markus 494: (r = sshkey_private_serialize_maxsign(key, msg, maxsign,
495: NULL)) != 0 ||
496: (r = sshbuf_put_cstring(msg, comment)) != 0)
1.94 djm 497: goto out;
1.22 markus 498: break;
499: default:
1.94 djm 500: r = SSH_ERR_INVALID_ARGUMENT;
501: goto out;
1.12 markus 502: }
1.94 djm 503: if (constrained &&
1.118 djm 504: (r = encode_constraints(msg, life, confirm, maxsign,
505: provider)) != 0)
1.94 djm 506: goto out;
507: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
508: goto out;
509: if ((r = sshbuf_get_u8(msg, &type)) != 0)
510: goto out;
511: r = decode_reply(type);
512: out:
513: sshbuf_free(msg);
514: return r;
1.54 markus 515: }
516:
1.14 markus 517: /*
1.94 djm 518: * Removes an identity from the authentication server.
519: * This call is intended only for use by ssh-add(1) and like applications.
1.14 markus 520: */
1.18 markus 521: int
1.94 djm 522: ssh_remove_identity(int sock, struct sshkey *key)
1.1 deraadt 523: {
1.94 djm 524: struct sshbuf *msg;
525: int r;
526: u_char type, *blob = NULL;
527: size_t blen;
1.12 markus 528:
1.94 djm 529: if ((msg = sshbuf_new()) == NULL)
530: return SSH_ERR_ALLOC_FAIL;
1.12 markus 531:
1.93 markus 532: if (key->type != KEY_UNSPEC) {
1.94 djm 533: if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
534: goto out;
535: if ((r = sshbuf_put_u8(msg,
536: SSH2_AGENTC_REMOVE_IDENTITY)) != 0 ||
537: (r = sshbuf_put_string(msg, blob, blen)) != 0)
538: goto out;
1.51 markus 539: } else {
1.94 djm 540: r = SSH_ERR_INVALID_ARGUMENT;
541: goto out;
1.51 markus 542: }
1.94 djm 543: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
544: goto out;
545: if ((r = sshbuf_get_u8(msg, &type)) != 0)
546: goto out;
547: r = decode_reply(type);
548: out:
549: if (blob != NULL) {
550: explicit_bzero(blob, blen);
551: free(blob);
1.42 markus 552: }
1.94 djm 553: sshbuf_free(msg);
554: return r;
1.42 markus 555: }
556:
1.94 djm 557: /*
558: * Add/remove an token-based identity from the authentication server.
559: * This call is intended only for use by ssh-add(1) and like applications.
560: */
1.42 markus 561: int
1.94 djm 562: ssh_update_card(int sock, int add, const char *reader_id, const char *pin,
563: u_int life, u_int confirm)
1.42 markus 564: {
1.94 djm 565: struct sshbuf *msg;
566: int r, constrained = (life || confirm);
567: u_char type;
1.60 djm 568:
569: if (add) {
570: type = constrained ?
571: SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
572: SSH_AGENTC_ADD_SMARTCARD_KEY;
573: } else
574: type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
1.42 markus 575:
1.94 djm 576: if ((msg = sshbuf_new()) == NULL)
577: return SSH_ERR_ALLOC_FAIL;
578: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
579: (r = sshbuf_put_cstring(msg, reader_id)) != 0 ||
580: (r = sshbuf_put_cstring(msg, pin)) != 0)
581: goto out;
582: if (constrained &&
1.118 djm 583: (r = encode_constraints(msg, life, confirm, 0, NULL)) != 0)
1.94 djm 584: goto out;
585: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
586: goto out;
587: if ((r = sshbuf_get_u8(msg, &type)) != 0)
588: goto out;
589: r = decode_reply(type);
590: out:
591: sshbuf_free(msg);
592: return r;
1.12 markus 593: }
594:
1.14 markus 595: /*
1.94 djm 596: * Removes all identities from the agent.
597: * This call is intended only for use by ssh-add(1) and like applications.
1.102 djm 598: *
599: * This supports the SSH protocol 1 message to because, when clearing all
600: * keys from an agent, we generally want to clear both protocol v1 and v2
601: * keys.
1.14 markus 602: */
1.18 markus 603: int
1.94 djm 604: ssh_remove_all_identities(int sock, int version)
1.1 deraadt 605: {
1.94 djm 606: struct sshbuf *msg;
607: u_char type = (version == 1) ?
608: SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES :
609: SSH2_AGENTC_REMOVE_ALL_IDENTITIES;
610: int r;
611:
612: if ((msg = sshbuf_new()) == NULL)
613: return SSH_ERR_ALLOC_FAIL;
614: if ((r = sshbuf_put_u8(msg, type)) != 0)
615: goto out;
616: if ((r = ssh_request_reply(sock, msg, msg)) != 0)
617: goto out;
618: if ((r = sshbuf_get_u8(msg, &type)) != 0)
619: goto out;
620: r = decode_reply(type);
621: out:
622: sshbuf_free(msg);
623: return r;
1.12 markus 624: }
![[BACK]](/icons/back.gif){kind=icon}
Return to authfd.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh