Annotation of src/usr.bin/ssh/auth2-pubkey.c, Revision 1.67
1.67 ! markus 1: /* $OpenBSD: auth2-pubkey.c,v 1.66 2017/05/31 09:15:42 deraadt Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24: */
25:
1.10 stevesk 26:
27: #include <sys/types.h>
28: #include <sys/stat.h>
1.31 djm 29: #include <sys/wait.h>
1.13 stevesk 30:
1.31 djm 31: #include <errno.h>
1.16 djm 32: #include <fcntl.h>
1.31 djm 33: #include <paths.h>
1.13 stevesk 34: #include <pwd.h>
1.31 djm 35: #include <signal.h>
1.14 stevesk 36: #include <stdio.h>
1.15 deraadt 37: #include <stdarg.h>
1.20 djm 38: #include <string.h>
39: #include <time.h>
1.17 dtucker 40: #include <unistd.h>
1.44 djm 41: #include <limits.h>
1.1 markus 42:
1.15 deraadt 43: #include "xmalloc.h"
1.8 dtucker 44: #include "ssh.h"
1.1 markus 45: #include "ssh2.h"
46: #include "packet.h"
47: #include "buffer.h"
48: #include "log.h"
1.41 millert 49: #include "misc.h"
1.1 markus 50: #include "servconf.h"
51: #include "compat.h"
1.64 markus 52: #include "sshkey.h"
1.15 deraadt 53: #include "hostfile.h"
1.1 markus 54: #include "auth.h"
55: #include "pathnames.h"
56: #include "uidswap.h"
57: #include "auth-options.h"
58: #include "canohost.h"
1.15 deraadt 59: #ifdef GSSAPI
60: #include "ssh-gss.h"
61: #endif
1.1 markus 62: #include "monitor_wrap.h"
1.21 djm 63: #include "authfile.h"
1.24 djm 64: #include "match.h"
1.50 djm 65: #include "ssherr.h"
66: #include "channels.h" /* XXX for session.h */
67: #include "session.h" /* XXX for child_set_env(); refactor? */
1.1 markus 68:
69: /* import */
70: extern ServerOptions options;
71: extern u_char *session_id2;
1.4 markus 72: extern u_int session_id2_len;
1.1 markus 73:
1.2 markus 74: static int
1.65 markus 75: userauth_pubkey(struct ssh *ssh)
1.1 markus 76: {
1.65 markus 77: Authctxt *authctxt = ssh->authctxt;
1.64 markus 78: struct sshbuf *b;
1.63 markus 79: struct sshkey *key = NULL;
1.64 markus 80: char *pkalg, *userstyle = NULL, *fp = NULL;
81: u_char *pkblob, *sig, have_sig;
82: size_t blen, slen;
83: int r, pktype;
1.1 markus 84: int authenticated = 0;
85:
86: if (!authctxt->valid) {
1.55 djm 87: debug2("%s: disabled because of invalid user", __func__);
1.1 markus 88: return 0;
89: }
1.64 markus 90: if ((r = sshpkt_get_u8(ssh, &have_sig)) != 0)
91: fatal("%s: sshpkt_get_u8 failed: %s", __func__, ssh_err(r));
92: if (ssh->compat & SSH_BUG_PKAUTH) {
1.55 djm 93: debug2("%s: SSH_BUG_PKAUTH", __func__);
1.64 markus 94: if ((b = sshbuf_new()) == NULL)
95: fatal("%s: sshbuf_new failed", __func__);
1.1 markus 96: /* no explicit pkalg given */
97: /* so we have to extract the pkalg from the pkblob */
1.64 markus 98: /* XXX use sshbuf_from() */
99: if ((r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 ||
100: (r = sshbuf_put(b, pkblob, blen)) != 0 ||
101: (r = sshbuf_get_cstring(b, &pkalg, NULL)) != 0)
102: fatal("%s: failed: %s", __func__, ssh_err(r));
103: sshbuf_free(b);
1.1 markus 104: } else {
1.64 markus 105: if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 ||
106: (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0)
107: fatal("%s: sshpkt_get_cstring failed: %s",
108: __func__, ssh_err(r));
1.1 markus 109: }
1.64 markus 110: pktype = sshkey_type_from_name(pkalg);
1.1 markus 111: if (pktype == KEY_UNSPEC) {
112: /* this is perfectly legal */
1.55 djm 113: logit("%s: unsupported public key algorithm: %s",
114: __func__, pkalg);
1.1 markus 115: goto done;
116: }
1.64 markus 117: if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
118: error("%s: could not parse key: %s", __func__, ssh_err(r));
119: goto done;
120: }
1.1 markus 121: if (key == NULL) {
1.55 djm 122: error("%s: cannot decode key: %s", __func__, pkalg);
1.1 markus 123: goto done;
124: }
125: if (key->type != pktype) {
1.55 djm 126: error("%s: type mismatch for decoded key "
127: "(received %d, expected %d)", __func__, key->type, pktype);
1.39 djm 128: goto done;
129: }
1.64 markus 130: if (sshkey_type_plain(key->type) == KEY_RSA &&
131: (ssh->compat & SSH_BUG_RSASIGMD5) != 0) {
1.39 djm 132: logit("Refusing RSA key because client uses unsafe "
133: "signature scheme");
1.1 markus 134: goto done;
135: }
1.55 djm 136: fp = sshkey_fingerprint(key, options.fingerprint_hash, SSH_FP_DEFAULT);
1.44 djm 137: if (auth2_userkey_already_used(authctxt, key)) {
1.64 markus 138: logit("refusing previously-used %s key", sshkey_type(key));
1.44 djm 139: goto done;
140: }
1.49 djm 141: if (match_pattern_list(sshkey_ssh_name(key),
142: options.pubkey_key_types, 0) != 1) {
1.45 djm 143: logit("%s: key type %s not in PubkeyAcceptedKeyTypes",
144: __func__, sshkey_ssh_name(key));
145: goto done;
146: }
147:
1.1 markus 148: if (have_sig) {
1.55 djm 149: debug3("%s: have signature for %s %s",
150: __func__, sshkey_type(key), fp);
1.64 markus 151: if ((r = sshpkt_get_string(ssh, &sig, &slen)) != 0 ||
152: (r = sshpkt_get_end(ssh)) != 0)
153: fatal("%s: %s", __func__, ssh_err(r));
154: if ((b = sshbuf_new()) == NULL)
155: fatal("%s: sshbuf_new failed", __func__);
156: if (ssh->compat & SSH_OLD_SESSIONID) {
157: if ((r = sshbuf_put(b, session_id2,
158: session_id2_len)) != 0)
159: fatal("%s: sshbuf_put session id: %s",
160: __func__, ssh_err(r));
1.1 markus 161: } else {
1.64 markus 162: if ((r = sshbuf_put_string(b, session_id2,
163: session_id2_len)) != 0)
164: fatal("%s: sshbuf_put_string session id: %s",
165: __func__, ssh_err(r));
1.1 markus 166: }
167: /* reconstruct packet */
1.35 djm 168: xasprintf(&userstyle, "%s%s%s", authctxt->user,
169: authctxt->style ? ":" : "",
170: authctxt->style ? authctxt->style : "");
1.64 markus 171: if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
172: (r = sshbuf_put_cstring(b, userstyle)) != 0 ||
173: (r = sshbuf_put_cstring(b, ssh->compat & SSH_BUG_PKSERVICE ?
174: "ssh-userauth" : authctxt->service)) != 0)
175: fatal("%s: build packet failed: %s",
176: __func__, ssh_err(r));
177: if (ssh->compat & SSH_BUG_PKAUTH) {
178: if ((r = sshbuf_put_u8(b, have_sig)) != 0)
179: fatal("%s: build packet failed: %s",
180: __func__, ssh_err(r));
1.1 markus 181: } else {
1.64 markus 182: if ((r = sshbuf_put_cstring(b, "publickey")) != 0 ||
183: (r = sshbuf_put_u8(b, have_sig)) != 0 ||
184: (r = sshbuf_put_cstring(b, pkalg) != 0))
185: fatal("%s: build packet failed: %s",
186: __func__, ssh_err(r));
1.1 markus 187: }
1.64 markus 188: if ((r = sshbuf_put_string(b, pkblob, blen)) != 0)
189: fatal("%s: build packet failed: %s",
190: __func__, ssh_err(r));
1.1 markus 191: #ifdef DEBUG_PK
1.64 markus 192: sshbuf_dump(b, stderr);
1.1 markus 193: #endif
1.38 djm 194: pubkey_auth_info(authctxt, key, NULL);
1.37 djm 195:
1.1 markus 196: /* test for correct signature */
197: authenticated = 0;
1.48 djm 198: if (PRIVSEP(user_key_allowed(authctxt->pw, key, 1)) &&
1.64 markus 199: PRIVSEP(sshkey_verify(key, sig, slen, sshbuf_ptr(b),
200: sshbuf_len(b), ssh->compat)) == 0) {
1.1 markus 201: authenticated = 1;
1.44 djm 202: /* Record the successful key to prevent reuse */
203: auth2_record_userkey(authctxt, key);
204: key = NULL; /* Don't free below */
205: }
1.64 markus 206: sshbuf_free(b);
1.36 djm 207: free(sig);
1.1 markus 208: } else {
1.55 djm 209: debug("%s: test whether pkalg/pkblob are acceptable for %s %s",
210: __func__, sshkey_type(key), fp);
1.64 markus 211: if ((r = sshpkt_get_end(ssh)) != 0)
212: fatal("%s: %s", __func__, ssh_err(r));
1.1 markus 213:
214: /* XXX fake reply and always send PK_OK ? */
215: /*
216: * XXX this allows testing whether a user is allowed
217: * to login: if you happen to have a valid pubkey this
218: * message is sent. the message is NEVER sent at all
219: * if a user is not allowed to login. is this an
220: * issue? -markus
221: */
1.48 djm 222: if (PRIVSEP(user_key_allowed(authctxt->pw, key, 0))) {
1.64 markus 223: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_PK_OK))
224: != 0 ||
225: (r = sshpkt_put_cstring(ssh, pkalg)) != 0 ||
226: (r = sshpkt_put_string(ssh, pkblob, blen)) != 0 ||
227: (r = sshpkt_send(ssh)) != 0)
228: fatal("%s: %s", __func__, ssh_err(r));
229: ssh_packet_write_wait(ssh);
1.1 markus 230: authctxt->postponed = 1;
231: }
232: }
233: if (authenticated != 1)
234: auth_clear_options();
235: done:
1.55 djm 236: debug2("%s: authenticated %d pkalg %s", __func__, authenticated, pkalg);
1.1 markus 237: if (key != NULL)
1.64 markus 238: sshkey_free(key);
239: free(userstyle);
1.36 djm 240: free(pkalg);
241: free(pkblob);
1.55 djm 242: free(fp);
1.1 markus 243: return authenticated;
244: }
245:
1.37 djm 246: void
1.63 markus 247: pubkey_auth_info(Authctxt *authctxt, const struct sshkey *key,
248: const char *fmt, ...)
1.37 djm 249: {
1.38 djm 250: char *fp, *extra;
251: va_list ap;
252: int i;
253:
254: extra = NULL;
255: if (fmt != NULL) {
256: va_start(ap, fmt);
257: i = vasprintf(&extra, fmt, ap);
258: va_end(ap);
259: if (i < 0 || extra == NULL)
1.64 markus 260: fatal("%s: vasprintf failed", __func__);
1.38 djm 261: }
1.37 djm 262:
1.64 markus 263: if (sshkey_is_cert(key)) {
1.46 djm 264: fp = sshkey_fingerprint(key->cert->signature_key,
1.43 djm 265: options.fingerprint_hash, SSH_FP_DEFAULT);
1.38 djm 266: auth_info(authctxt, "%s ID %s (serial %llu) CA %s %s%s%s",
1.64 markus 267: sshkey_type(key), key->cert->key_id,
1.37 djm 268: (unsigned long long)key->cert->serial,
1.64 markus 269: sshkey_type(key->cert->signature_key),
1.47 djm 270: fp == NULL ? "(null)" : fp,
1.38 djm 271: extra == NULL ? "" : ", ", extra == NULL ? "" : extra);
1.37 djm 272: free(fp);
273: } else {
1.46 djm 274: fp = sshkey_fingerprint(key, options.fingerprint_hash,
1.43 djm 275: SSH_FP_DEFAULT);
1.64 markus 276: auth_info(authctxt, "%s %s%s%s", sshkey_type(key),
1.47 djm 277: fp == NULL ? "(null)" : fp,
1.38 djm 278: extra == NULL ? "" : ", ", extra == NULL ? "" : extra);
1.37 djm 279: free(fp);
280: }
1.38 djm 281: free(extra);
1.37 djm 282: }
283:
1.50 djm 284: /*
285: * Splits 's' into an argument vector. Handles quoted string and basic
286: * escape characters (\\, \", \'). Caller must free the argument vector
287: * and its members.
288: */
289: static int
290: split_argv(const char *s, int *argcp, char ***argvp)
291: {
292: int r = SSH_ERR_INTERNAL_ERROR;
293: int argc = 0, quote, i, j;
294: char *arg, **argv = xcalloc(1, sizeof(*argv));
295:
296: *argvp = NULL;
297: *argcp = 0;
298:
299: for (i = 0; s[i] != '\0'; i++) {
300: /* Skip leading whitespace */
301: if (s[i] == ' ' || s[i] == '\t')
302: continue;
303:
304: /* Start of a token */
305: quote = 0;
306: if (s[i] == '\\' &&
307: (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
308: i++;
309: else if (s[i] == '\'' || s[i] == '"')
310: quote = s[i++];
311:
312: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
313: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
314: argv[argc] = NULL;
315:
316: /* Copy the token in, removing escapes */
317: for (j = 0; s[i] != '\0'; i++) {
318: if (s[i] == '\\') {
319: if (s[i + 1] == '\'' ||
320: s[i + 1] == '\"' ||
321: s[i + 1] == '\\') {
322: i++; /* Skip '\' */
323: arg[j++] = s[i];
324: } else {
325: /* Unrecognised escape */
326: arg[j++] = s[i];
327: }
328: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
329: break; /* done */
330: else if (quote != 0 && s[i] == quote)
331: break; /* done */
332: else
333: arg[j++] = s[i];
334: }
335: if (s[i] == '\0') {
336: if (quote != 0) {
337: /* Ran out of string looking for close quote */
338: r = SSH_ERR_INVALID_FORMAT;
339: goto out;
340: }
341: break;
342: }
343: }
344: /* Success */
345: *argcp = argc;
346: *argvp = argv;
347: argc = 0;
348: argv = NULL;
349: r = 0;
350: out:
351: if (argc != 0 && argv != NULL) {
352: for (i = 0; i < argc; i++)
353: free(argv[i]);
354: free(argv);
355: }
356: return r;
357: }
358:
359: /*
360: * Reassemble an argument vector into a string, quoting and escaping as
361: * necessary. Caller must free returned string.
362: */
363: static char *
364: assemble_argv(int argc, char **argv)
365: {
366: int i, j, ws, r;
367: char c, *ret;
368: struct sshbuf *buf, *arg;
369:
370: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
371: fatal("%s: sshbuf_new failed", __func__);
372:
373: for (i = 0; i < argc; i++) {
374: ws = 0;
375: sshbuf_reset(arg);
376: for (j = 0; argv[i][j] != '\0'; j++) {
377: r = 0;
378: c = argv[i][j];
379: switch (c) {
380: case ' ':
381: case '\t':
382: ws = 1;
383: r = sshbuf_put_u8(arg, c);
384: break;
385: case '\\':
386: case '\'':
387: case '"':
388: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
389: break;
390: /* FALLTHROUGH */
391: default:
392: r = sshbuf_put_u8(arg, c);
393: break;
394: }
395: if (r != 0)
396: fatal("%s: sshbuf_put_u8: %s",
397: __func__, ssh_err(r));
398: }
399: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
400: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
401: (r = sshbuf_putb(buf, arg)) != 0 ||
402: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
403: fatal("%s: buffer error: %s", __func__, ssh_err(r));
404: }
405: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
406: fatal("%s: malloc failed", __func__);
407: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
408: ret[sshbuf_len(buf)] = '\0';
409: sshbuf_free(buf);
410: sshbuf_free(arg);
411: return ret;
412: }
413:
414: /*
415: * Runs command in a subprocess. Returns pid on success and a FILE* to the
416: * subprocess' stdout or 0 on failure.
417: * NB. "command" is only used for logging.
418: */
419: static pid_t
420: subprocess(const char *tag, struct passwd *pw, const char *command,
421: int ac, char **av, FILE **child)
422: {
423: FILE *f;
424: struct stat st;
425: int devnull, p[2], i;
426: pid_t pid;
427: char *cp, errmsg[512];
428: u_int envsize;
429: char **child_env;
430:
431: *child = NULL;
432:
433: debug3("%s: %s command \"%s\" running as %s", __func__,
434: tag, command, pw->pw_name);
435:
436: /* Verify the path exists and is safe-ish to execute */
437: if (*av[0] != '/') {
438: error("%s path is not absolute", tag);
439: return 0;
440: }
441: temporarily_use_uid(pw);
442: if (stat(av[0], &st) < 0) {
443: error("Could not stat %s \"%s\": %s", tag,
444: av[0], strerror(errno));
445: restore_uid();
446: return 0;
447: }
448: if (auth_secure_path(av[0], &st, NULL, 0,
449: errmsg, sizeof(errmsg)) != 0) {
450: error("Unsafe %s \"%s\": %s", tag, av[0], errmsg);
451: restore_uid();
452: return 0;
453: }
454:
455: /*
456: * Run the command; stderr is left in place, stdout is the
457: * authorized_keys output.
458: */
459: if (pipe(p) != 0) {
460: error("%s: pipe: %s", tag, strerror(errno));
461: restore_uid();
462: return 0;
463: }
464:
465: /*
466: * Don't want to call this in the child, where it can fatal() and
467: * run cleanup_exit() code.
468: */
469: restore_uid();
470:
471: switch ((pid = fork())) {
472: case -1: /* error */
473: error("%s: fork: %s", tag, strerror(errno));
474: close(p[0]);
475: close(p[1]);
476: return 0;
477: case 0: /* child */
478: /* Prepare a minimal environment for the child. */
479: envsize = 5;
480: child_env = xcalloc(sizeof(*child_env), envsize);
481: child_set_env(&child_env, &envsize, "PATH", _PATH_STDPATH);
482: child_set_env(&child_env, &envsize, "USER", pw->pw_name);
483: child_set_env(&child_env, &envsize, "LOGNAME", pw->pw_name);
484: child_set_env(&child_env, &envsize, "HOME", pw->pw_dir);
485: if ((cp = getenv("LANG")) != NULL)
486: child_set_env(&child_env, &envsize, "LANG", cp);
487:
488: for (i = 0; i < NSIG; i++)
489: signal(i, SIG_DFL);
490:
491: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
492: error("%s: open %s: %s", tag, _PATH_DEVNULL,
493: strerror(errno));
494: _exit(1);
495: }
496: /* Keep stderr around a while longer to catch errors */
497: if (dup2(devnull, STDIN_FILENO) == -1 ||
498: dup2(p[1], STDOUT_FILENO) == -1) {
499: error("%s: dup2: %s", tag, strerror(errno));
500: _exit(1);
501: }
502: closefrom(STDERR_FILENO + 1);
503:
504: /* Don't use permanently_set_uid() here to avoid fatal() */
505: if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) {
506: error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,
507: strerror(errno));
508: _exit(1);
509: }
510: if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) != 0) {
511: error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid,
512: strerror(errno));
513: _exit(1);
514: }
515: /* stdin is pointed to /dev/null at this point */
516: if (dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
517: error("%s: dup2: %s", tag, strerror(errno));
518: _exit(1);
519: }
520:
521: execve(av[0], av, child_env);
522: error("%s exec \"%s\": %s", tag, command, strerror(errno));
523: _exit(127);
524: default: /* parent */
525: break;
526: }
527:
528: close(p[1]);
529: if ((f = fdopen(p[0], "r")) == NULL) {
530: error("%s: fdopen: %s", tag, strerror(errno));
531: close(p[0]);
532: /* Don't leave zombie child */
533: kill(pid, SIGTERM);
534: while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
535: ;
536: return 0;
537: }
538: /* Success */
539: debug3("%s: %s pid %ld", __func__, tag, (long)pid);
540: *child = f;
541: return pid;
542: }
543:
544: /* Returns 0 if pid exited cleanly, non-zero otherwise */
545: static int
546: exited_cleanly(pid_t pid, const char *tag, const char *cmd)
547: {
548: int status;
549:
550: while (waitpid(pid, &status, 0) == -1) {
551: if (errno != EINTR) {
552: error("%s: waitpid: %s", tag, strerror(errno));
553: return -1;
554: }
555: }
556: if (WIFSIGNALED(status)) {
557: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
558: return -1;
559: } else if (WEXITSTATUS(status) != 0) {
560: error("%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
561: return -1;
562: }
563: return 0;
564: }
565:
1.24 djm 566: static int
1.40 djm 567: match_principals_option(const char *principal_list, struct sshkey_cert *cert)
1.24 djm 568: {
569: char *result;
570: u_int i;
571:
572: /* XXX percent_expand() sequences for authorized_principals? */
573:
574: for (i = 0; i < cert->nprincipals; i++) {
575: if ((result = match_list(cert->principals[i],
576: principal_list, NULL)) != NULL) {
577: debug3("matched principal from key options \"%.100s\"",
578: result);
1.36 djm 579: free(result);
1.24 djm 580: return 1;
581: }
582: }
583: return 0;
584: }
585:
586: static int
1.67 ! markus 587: process_principals(FILE *f, const char *file, struct passwd *pw,
1.56 djm 588: const struct sshkey_cert *cert)
1.24 djm 589: {
1.26 djm 590: char line[SSH_MAX_PUBKEY_BYTES], *cp, *ep, *line_opts;
1.24 djm 591: u_long linenum = 0;
1.62 djm 592: u_int i, found_principal = 0;
1.24 djm 593:
594: while (read_keyfile_line(f, file, line, sizeof(line), &linenum) != -1) {
1.62 djm 595: /* Always consume entire input */
596: if (found_principal)
597: continue;
1.26 djm 598: /* Skip leading whitespace. */
1.24 djm 599: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
600: ;
1.26 djm 601: /* Skip blank and comment lines. */
602: if ((ep = strchr(cp, '#')) != NULL)
603: *ep = '\0';
604: if (!*cp || *cp == '\n')
1.24 djm 605: continue;
1.26 djm 606: /* Trim trailing whitespace. */
607: ep = cp + strlen(cp) - 1;
608: while (ep > cp && (*ep == '\n' || *ep == ' ' || *ep == '\t'))
609: *ep-- = '\0';
610: /*
611: * If the line has internal whitespace then assume it has
612: * key options.
613: */
614: line_opts = NULL;
615: if ((ep = strrchr(cp, ' ')) != NULL ||
616: (ep = strrchr(cp, '\t')) != NULL) {
617: for (; *ep == ' ' || *ep == '\t'; ep++)
1.27 deraadt 618: ;
1.26 djm 619: line_opts = cp;
620: cp = ep;
621: }
1.24 djm 622: for (i = 0; i < cert->nprincipals; i++) {
623: if (strcmp(cp, cert->principals[i]) == 0) {
1.51 djm 624: debug3("%s:%lu: matched principal \"%.100s\"",
1.67 ! markus 625: file, linenum, cert->principals[i]);
1.26 djm 626: if (auth_parse_options(pw, line_opts,
627: file, linenum) != 1)
628: continue;
1.62 djm 629: found_principal = 1;
630: continue;
1.24 djm 631: }
632: }
633: }
1.62 djm 634: return found_principal;
1.51 djm 635: }
636:
637: static int
638: match_principals_file(char *file, struct passwd *pw, struct sshkey_cert *cert)
639: {
640: FILE *f;
641: int success;
642:
643: temporarily_use_uid(pw);
644: debug("trying authorized principals file %s", file);
645: if ((f = auth_openprincipals(file, pw, options.strict_modes)) == NULL) {
646: restore_uid();
647: return 0;
648: }
649: success = process_principals(f, file, pw, cert);
1.24 djm 650: fclose(f);
651: restore_uid();
1.51 djm 652: return success;
1.31 djm 653: }
1.24 djm 654:
1.31 djm 655: /*
1.51 djm 656: * Checks whether principal is allowed in output of command.
657: * returns 1 if the principal is allowed or 0 otherwise.
658: */
659: static int
1.56 djm 660: match_principals_command(struct passwd *user_pw, const struct sshkey *key)
1.51 djm 661: {
1.56 djm 662: const struct sshkey_cert *cert = key->cert;
1.51 djm 663: FILE *f = NULL;
1.56 djm 664: int r, ok, found_principal = 0;
1.51 djm 665: struct passwd *pw;
666: int i, ac = 0, uid_swapped = 0;
667: pid_t pid;
668: char *tmp, *username = NULL, *command = NULL, **av = NULL;
1.56 djm 669: char *ca_fp = NULL, *key_fp = NULL, *catext = NULL, *keytext = NULL;
1.58 djm 670: char serial_s[16];
1.51 djm 671: void (*osigchld)(int);
672:
673: if (options.authorized_principals_command == NULL)
674: return 0;
675: if (options.authorized_principals_command_user == NULL) {
676: error("No user for AuthorizedPrincipalsCommand specified, "
677: "skipping");
678: return 0;
679: }
680:
681: /*
682: * NB. all returns later this function should go via "out" to
683: * ensure the original SIGCHLD handler is restored properly.
684: */
685: osigchld = signal(SIGCHLD, SIG_DFL);
686:
687: /* Prepare and verify the user for the command */
688: username = percent_expand(options.authorized_principals_command_user,
689: "u", user_pw->pw_name, (char *)NULL);
690: pw = getpwnam(username);
691: if (pw == NULL) {
692: error("AuthorizedPrincipalsCommandUser \"%s\" not found: %s",
693: username, strerror(errno));
694: goto out;
695: }
696:
697: /* Turn the command into an argument vector */
698: if (split_argv(options.authorized_principals_command, &ac, &av) != 0) {
699: error("AuthorizedPrincipalsCommand \"%s\" contains "
700: "invalid quotes", command);
701: goto out;
702: }
703: if (ac == 0) {
704: error("AuthorizedPrincipalsCommand \"%s\" yielded no arguments",
705: command);
706: goto out;
707: }
1.56 djm 708: if ((ca_fp = sshkey_fingerprint(cert->signature_key,
709: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL) {
710: error("%s: sshkey_fingerprint failed", __func__);
711: goto out;
712: }
1.57 djm 713: if ((key_fp = sshkey_fingerprint(key,
1.56 djm 714: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL) {
715: error("%s: sshkey_fingerprint failed", __func__);
716: goto out;
717: }
718: if ((r = sshkey_to_base64(cert->signature_key, &catext)) != 0) {
719: error("%s: sshkey_to_base64 failed: %s", __func__, ssh_err(r));
720: goto out;
721: }
722: if ((r = sshkey_to_base64(key, &keytext)) != 0) {
723: error("%s: sshkey_to_base64 failed: %s", __func__, ssh_err(r));
724: goto out;
725: }
1.59 djm 726: snprintf(serial_s, sizeof(serial_s), "%llu",
727: (unsigned long long)cert->serial);
1.51 djm 728: for (i = 1; i < ac; i++) {
729: tmp = percent_expand(av[i],
730: "u", user_pw->pw_name,
731: "h", user_pw->pw_dir,
1.56 djm 732: "t", sshkey_ssh_name(key),
733: "T", sshkey_ssh_name(cert->signature_key),
734: "f", key_fp,
735: "F", ca_fp,
736: "k", keytext,
737: "K", catext,
1.58 djm 738: "i", cert->key_id,
739: "s", serial_s,
1.51 djm 740: (char *)NULL);
741: if (tmp == NULL)
742: fatal("%s: percent_expand failed", __func__);
743: free(av[i]);
744: av[i] = tmp;
745: }
746: /* Prepare a printable command for logs, etc. */
747: command = assemble_argv(ac, av);
748:
749: if ((pid = subprocess("AuthorizedPrincipalsCommand", pw, command,
750: ac, av, &f)) == 0)
751: goto out;
752:
753: uid_swapped = 1;
754: temporarily_use_uid(pw);
755:
1.67 ! markus 756: ok = process_principals(f, "(command)", pw, cert);
1.51 djm 757:
1.61 djm 758: fclose(f);
759: f = NULL;
760:
1.51 djm 761: if (exited_cleanly(pid, "AuthorizedPrincipalsCommand", command) != 0)
762: goto out;
763:
764: /* Read completed successfully */
765: found_principal = ok;
766: out:
767: if (f != NULL)
768: fclose(f);
769: signal(SIGCHLD, osigchld);
770: for (i = 0; i < ac; i++)
771: free(av[i]);
772: free(av);
773: if (uid_swapped)
774: restore_uid();
775: free(command);
776: free(username);
1.56 djm 777: free(ca_fp);
778: free(key_fp);
779: free(catext);
780: free(keytext);
1.51 djm 781: return found_principal;
782: }
783: /*
1.31 djm 784: * Checks whether key is allowed in authorized_keys-format file,
785: * returns 1 if the key is allowed or 0 otherwise.
786: */
1.1 markus 787: static int
1.64 markus 788: check_authkeys_file(FILE *f, char *file, struct sshkey *key, struct passwd *pw)
1.1 markus 789: {
1.8 dtucker 790: char line[SSH_MAX_PUBKEY_BYTES];
1.18 dtucker 791: int found_key = 0;
1.1 markus 792: u_long linenum = 0;
1.64 markus 793: struct sshkey *found = NULL;
1.1 markus 794:
1.8 dtucker 795: while (read_keyfile_line(f, file, line, sizeof(line), &linenum) != -1) {
1.60 djm 796: char *cp, *key_options = NULL, *fp = NULL;
797: const char *reason = NULL;
798:
1.62 djm 799: /* Always consume entrire file */
800: if (found_key)
801: continue;
1.37 djm 802: if (found != NULL)
1.64 markus 803: sshkey_free(found);
804: found = sshkey_new(sshkey_is_cert(key) ? KEY_UNSPEC : key->type);
805: if (found == NULL)
806: goto done;
1.20 djm 807: auth_clear_options();
808:
1.1 markus 809: /* Skip leading whitespace, empty and comment lines. */
810: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
811: ;
812: if (!*cp || *cp == '\n' || *cp == '#')
813: continue;
814:
1.64 markus 815: if (sshkey_read(found, &cp) != 0) {
1.1 markus 816: /* no key? check if there are options for this key */
817: int quoted = 0;
818: debug2("user_key_allowed: check options: '%s'", cp);
1.7 avsm 819: key_options = cp;
1.1 markus 820: for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) {
821: if (*cp == '\\' && cp[1] == '"')
822: cp++; /* Skip both */
823: else if (*cp == '"')
824: quoted = !quoted;
825: }
826: /* Skip remaining whitespace. */
827: for (; *cp == ' ' || *cp == '\t'; cp++)
828: ;
1.64 markus 829: if (sshkey_read(found, &cp) != 0) {
1.1 markus 830: debug2("user_key_allowed: advance: '%s'", cp);
831: /* still no key? advance to next line*/
832: continue;
833: }
834: }
1.64 markus 835: if (sshkey_is_cert(key)) {
836: if (!sshkey_equal(found, key->cert->signature_key))
1.25 djm 837: continue;
838: if (auth_parse_options(pw, key_options, file,
839: linenum) != 1)
840: continue;
1.20 djm 841: if (!key_is_cert_authority)
842: continue;
1.46 djm 843: if ((fp = sshkey_fingerprint(found,
844: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
845: continue;
1.22 djm 846: debug("matching CA found: file %s, line %lu, %s %s",
1.64 markus 847: file, linenum, sshkey_type(found), fp);
1.24 djm 848: /*
849: * If the user has specified a list of principals as
850: * a key option, then prefer that list to matching
851: * their username in the certificate principals list.
852: */
853: if (authorized_principals != NULL &&
854: !match_principals_option(authorized_principals,
855: key->cert)) {
856: reason = "Certificate does not contain an "
857: "authorized principal";
858: fail_reason:
1.36 djm 859: free(fp);
1.20 djm 860: error("%s", reason);
861: auth_debug_add("%s", reason);
862: continue;
863: }
1.64 markus 864: if (sshkey_cert_check_authority(key, 0, 0,
1.24 djm 865: authorized_principals == NULL ? pw->pw_name : NULL,
866: &reason) != 0)
867: goto fail_reason;
1.60 djm 868: if (auth_cert_options(key, pw, &reason) != 0)
869: goto fail_reason;
1.54 djm 870: verbose("Accepted certificate ID \"%s\" (serial %llu) "
1.22 djm 871: "signed by %s CA %s via %s", key->cert->key_id,
1.54 djm 872: (unsigned long long)key->cert->serial,
1.64 markus 873: sshkey_type(found), fp, file);
1.36 djm 874: free(fp);
1.20 djm 875: found_key = 1;
876: break;
1.64 markus 877: } else if (sshkey_equal(found, key)) {
1.25 djm 878: if (auth_parse_options(pw, key_options, file,
879: linenum) != 1)
880: continue;
881: if (key_is_cert_authority)
882: continue;
1.46 djm 883: if ((fp = sshkey_fingerprint(found,
884: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
885: continue;
1.37 djm 886: debug("matching key found: file %s, line %lu %s %s",
1.64 markus 887: file, linenum, sshkey_type(found), fp);
1.36 djm 888: free(fp);
1.46 djm 889: found_key = 1;
1.62 djm 890: continue;
1.1 markus 891: }
892: }
1.64 markus 893: done:
1.37 djm 894: if (found != NULL)
1.64 markus 895: sshkey_free(found);
1.1 markus 896: if (!found_key)
897: debug2("key not found");
898: return found_key;
899: }
900:
1.21 djm 901: /* Authenticate a certificate key against TrustedUserCAKeys */
902: static int
1.63 markus 903: user_cert_trusted_ca(struct passwd *pw, struct sshkey *key)
1.21 djm 904: {
1.24 djm 905: char *ca_fp, *principals_file = NULL;
1.21 djm 906: const char *reason;
1.64 markus 907: int r, ret = 0, found_principal = 0, use_authorized_principals;
1.21 djm 908:
1.64 markus 909: if (!sshkey_is_cert(key) || options.trusted_user_ca_keys == NULL)
1.21 djm 910: return 0;
911:
1.46 djm 912: if ((ca_fp = sshkey_fingerprint(key->cert->signature_key,
913: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
914: return 0;
1.21 djm 915:
1.64 markus 916: if ((r = sshkey_in_file(key->cert->signature_key,
917: options.trusted_user_ca_keys, 1, 0)) != 0) {
918: debug2("%s: CA %s %s is not listed in %s: %s", __func__,
919: sshkey_type(key->cert->signature_key), ca_fp,
920: options.trusted_user_ca_keys, ssh_err(r));
1.21 djm 921: goto out;
922: }
1.24 djm 923: /*
924: * If AuthorizedPrincipals is in use, then compare the certificate
925: * principals against the names in that file rather than matching
926: * against the username.
927: */
928: if ((principals_file = authorized_principals_file(pw)) != NULL) {
1.51 djm 929: if (match_principals_file(principals_file, pw, key->cert))
930: found_principal = 1;
931: }
932: /* Try querying command if specified */
1.56 djm 933: if (!found_principal && match_principals_command(pw, key))
1.51 djm 934: found_principal = 1;
1.53 jsing 935: /* If principals file or command is specified, then require a match */
936: use_authorized_principals = principals_file != NULL ||
937: options.authorized_principals_command != NULL;
938: if (!found_principal && use_authorized_principals) {
1.51 djm 939: reason = "Certificate does not contain an authorized principal";
1.24 djm 940: fail_reason:
1.51 djm 941: error("%s", reason);
942: auth_debug_add("%s", reason);
943: goto out;
1.21 djm 944: }
1.64 markus 945: if (sshkey_cert_check_authority(key, 0, 1,
1.53 jsing 946: use_authorized_principals ? NULL : pw->pw_name, &reason) != 0)
1.24 djm 947: goto fail_reason;
1.60 djm 948: if (auth_cert_options(key, pw, &reason) != 0)
949: goto fail_reason;
1.21 djm 950:
1.54 djm 951: verbose("Accepted certificate ID \"%s\" (serial %llu) signed by "
952: "%s CA %s via %s", key->cert->key_id,
953: (unsigned long long)key->cert->serial,
1.64 markus 954: sshkey_type(key->cert->signature_key), ca_fp,
1.22 djm 955: options.trusted_user_ca_keys);
1.21 djm 956: ret = 1;
957:
958: out:
1.36 djm 959: free(principals_file);
960: free(ca_fp);
1.21 djm 961: return ret;
962: }
963:
1.31 djm 964: /*
965: * Checks whether key is allowed in file.
966: * returns 1 if the key is allowed or 0 otherwise.
967: */
968: static int
1.63 markus 969: user_key_allowed2(struct passwd *pw, struct sshkey *key, char *file)
1.31 djm 970: {
971: FILE *f;
972: int found_key = 0;
973:
974: /* Temporarily use the user's uid. */
975: temporarily_use_uid(pw);
976:
977: debug("trying public key file %s", file);
978: if ((f = auth_openkeyfile(file, pw, options.strict_modes)) != NULL) {
979: found_key = check_authkeys_file(f, file, key, pw);
980: fclose(f);
981: }
982:
983: restore_uid();
984: return found_key;
985: }
986:
987: /*
988: * Checks whether key is allowed in output of command.
989: * returns 1 if the key is allowed or 0 otherwise.
990: */
991: static int
1.63 markus 992: user_key_command_allowed2(struct passwd *user_pw, struct sshkey *key)
1.31 djm 993: {
1.50 djm 994: FILE *f = NULL;
995: int r, ok, found_key = 0;
1.31 djm 996: struct passwd *pw;
1.50 djm 997: int i, uid_swapped = 0, ac = 0;
1.31 djm 998: pid_t pid;
1.50 djm 999: char *username = NULL, *key_fp = NULL, *keytext = NULL;
1000: char *tmp, *command = NULL, **av = NULL;
1001: void (*osigchld)(int);
1.31 djm 1002:
1.50 djm 1003: if (options.authorized_keys_command == NULL)
1.31 djm 1004: return 0;
1.32 djm 1005: if (options.authorized_keys_command_user == NULL) {
1006: error("No user for AuthorizedKeysCommand specified, skipping");
1007: return 0;
1008: }
1009:
1.50 djm 1010: /*
1011: * NB. all returns later this function should go via "out" to
1012: * ensure the original SIGCHLD handler is restored properly.
1013: */
1014: osigchld = signal(SIGCHLD, SIG_DFL);
1015:
1016: /* Prepare and verify the user for the command */
1.32 djm 1017: username = percent_expand(options.authorized_keys_command_user,
1018: "u", user_pw->pw_name, (char *)NULL);
1019: pw = getpwnam(username);
1020: if (pw == NULL) {
1.34 djm 1021: error("AuthorizedKeysCommandUser \"%s\" not found: %s",
1022: username, strerror(errno));
1.50 djm 1023: goto out;
1.31 djm 1024: }
1025:
1.50 djm 1026: /* Prepare AuthorizedKeysCommand */
1027: if ((key_fp = sshkey_fingerprint(key, options.fingerprint_hash,
1028: SSH_FP_DEFAULT)) == NULL) {
1029: error("%s: sshkey_fingerprint failed", __func__);
1.31 djm 1030: goto out;
1031: }
1.50 djm 1032: if ((r = sshkey_to_base64(key, &keytext)) != 0) {
1033: error("%s: sshkey_to_base64 failed: %s", __func__, ssh_err(r));
1.31 djm 1034: goto out;
1035: }
1036:
1.50 djm 1037: /* Turn the command into an argument vector */
1038: if (split_argv(options.authorized_keys_command, &ac, &av) != 0) {
1039: error("AuthorizedKeysCommand \"%s\" contains invalid quotes",
1040: command);
1041: goto out;
1042: }
1043: if (ac == 0) {
1044: error("AuthorizedKeysCommand \"%s\" yielded no arguments",
1045: command);
1.31 djm 1046: goto out;
1047: }
1.50 djm 1048: for (i = 1; i < ac; i++) {
1049: tmp = percent_expand(av[i],
1050: "u", user_pw->pw_name,
1051: "h", user_pw->pw_dir,
1052: "t", sshkey_ssh_name(key),
1053: "f", key_fp,
1054: "k", keytext,
1055: (char *)NULL);
1056: if (tmp == NULL)
1057: fatal("%s: percent_expand failed", __func__);
1058: free(av[i]);
1059: av[i] = tmp;
1060: }
1061: /* Prepare a printable command for logs, etc. */
1062: command = assemble_argv(ac, av);
1.31 djm 1063:
1064: /*
1.50 djm 1065: * If AuthorizedKeysCommand was run without arguments
1066: * then fall back to the old behaviour of passing the
1067: * target username as a single argument.
1.31 djm 1068: */
1.50 djm 1069: if (ac == 1) {
1070: av = xreallocarray(av, ac + 2, sizeof(*av));
1071: av[1] = xstrdup(user_pw->pw_name);
1072: av[2] = NULL;
1073: /* Fix up command too, since it is used in log messages */
1074: free(command);
1075: xasprintf(&command, "%s %s", av[0], av[1]);
1076: }
1.31 djm 1077:
1.50 djm 1078: if ((pid = subprocess("AuthorizedKeysCommand", pw, command,
1079: ac, av, &f)) == 0)
1080: goto out;
1.31 djm 1081:
1.50 djm 1082: uid_swapped = 1;
1.31 djm 1083: temporarily_use_uid(pw);
1084:
1085: ok = check_authkeys_file(f, options.authorized_keys_command, key, pw);
1.61 djm 1086:
1087: fclose(f);
1088: f = NULL;
1.31 djm 1089:
1.50 djm 1090: if (exited_cleanly(pid, "AuthorizedKeysCommand", command) != 0)
1.31 djm 1091: goto out;
1.50 djm 1092:
1093: /* Read completed successfully */
1.31 djm 1094: found_key = ok;
1095: out:
1.50 djm 1096: if (f != NULL)
1097: fclose(f);
1098: signal(SIGCHLD, osigchld);
1099: for (i = 0; i < ac; i++)
1100: free(av[i]);
1101: free(av);
1102: if (uid_swapped)
1103: restore_uid();
1104: free(command);
1105: free(username);
1106: free(key_fp);
1107: free(keytext);
1.31 djm 1108: return found_key;
1109: }
1110:
1111: /*
1112: * Check whether key authenticates and authorises the user.
1113: */
1.1 markus 1114: int
1.63 markus 1115: user_key_allowed(struct passwd *pw, struct sshkey *key, int auth_attempt)
1.1 markus 1116: {
1.29 djm 1117: u_int success, i;
1.1 markus 1118: char *file;
1.21 djm 1119:
1120: if (auth_key_is_revoked(key))
1121: return 0;
1.64 markus 1122: if (sshkey_is_cert(key) &&
1123: auth_key_is_revoked(key->cert->signature_key))
1.21 djm 1124: return 0;
1125:
1126: success = user_cert_trusted_ca(pw, key);
1127: if (success)
1128: return success;
1.1 markus 1129:
1.31 djm 1130: success = user_key_command_allowed2(pw, key);
1131: if (success > 0)
1132: return success;
1133:
1.29 djm 1134: for (i = 0; !success && i < options.num_authkeys_files; i++) {
1.31 djm 1135:
1136: if (strcasecmp(options.authorized_keys_files[i], "none") == 0)
1137: continue;
1.29 djm 1138: file = expand_authorized_keys(
1139: options.authorized_keys_files[i], pw);
1.31 djm 1140:
1.29 djm 1141: success = user_key_allowed2(pw, key, file);
1.36 djm 1142: free(file);
1.29 djm 1143: }
1.1 markus 1144:
1145: return success;
1.44 djm 1146: }
1147:
1148: /* Records a public key in the list of previously-successful keys */
1149: void
1150: auth2_record_userkey(Authctxt *authctxt, struct sshkey *key)
1151: {
1152: struct sshkey **tmp;
1153:
1154: if (authctxt->nprev_userkeys >= INT_MAX ||
1.66 deraadt 1155: (tmp = recallocarray(authctxt->prev_userkeys,
1156: authctxt->nprev_userkeys, authctxt->nprev_userkeys + 1,
1157: sizeof(*tmp))) == NULL)
1158: fatal("%s: recallocarray failed", __func__);
1.44 djm 1159: authctxt->prev_userkeys = tmp;
1160: authctxt->prev_userkeys[authctxt->nprev_userkeys] = key;
1161: authctxt->nprev_userkeys++;
1162: }
1163:
1164: /* Checks whether a key has already been used successfully for authentication */
1165: int
1166: auth2_userkey_already_used(Authctxt *authctxt, struct sshkey *key)
1167: {
1168: u_int i;
1169:
1170: for (i = 0; i < authctxt->nprev_userkeys; i++) {
1171: if (sshkey_equal_public(key, authctxt->prev_userkeys[i])) {
1172: return 1;
1173: }
1174: }
1175: return 0;
1.1 markus 1176: }
1.2 markus 1177:
1178: Authmethod method_pubkey = {
1179: "publickey",
1180: userauth_pubkey,
1181: &options.pubkey_authentication
1182: };
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