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1.93 ! djm 1: /* $OpenBSD: auth-options.c,v 1.92 2020/03/06 18:15:38 markus Exp $ */
1.75 djm 2: /*
3: * Copyright (c) 2018 Damien Miller <djm@mindrot.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
1.3 deraadt 17:
1.36 stevesk 18: #include <sys/types.h>
1.42 djm 19: #include <sys/queue.h>
1.36 stevesk 20:
1.88 djm 21: #include <stdlib.h>
1.37 stevesk 22: #include <netdb.h>
1.36 stevesk 23: #include <pwd.h>
1.39 stevesk 24: #include <string.h>
1.40 deraadt 25: #include <stdio.h>
26: #include <stdarg.h>
1.75 djm 27: #include <ctype.h>
28: #include <limits.h>
1.1 markus 29:
30: #include "xmalloc.h"
1.65 markus 31: #include "ssherr.h"
1.11 markus 32: #include "log.h"
1.65 markus 33: #include "sshbuf.h"
1.64 millert 34: #include "misc.h"
1.65 markus 35: #include "sshkey.h"
1.76 djm 36: #include "match.h"
37: #include "ssh2.h"
1.50 djm 38: #include "auth-options.h"
1.75 djm 39:
40: static int
41: dup_strings(char ***dstp, size_t *ndstp, char **src, size_t nsrc)
42: {
43: char **dst;
44: size_t i, j;
45:
46: *dstp = NULL;
47: *ndstp = 0;
48: if (nsrc == 0)
49: return 0;
50:
51: if ((dst = calloc(nsrc, sizeof(*src))) == NULL)
52: return -1;
53: for (i = 0; i < nsrc; i++) {
54: if ((dst[i] = strdup(src[i])) == NULL) {
55: for (j = 0; j < i; j++)
56: free(dst[j]);
57: free(dst);
58: return -1;
59: }
60: }
61: /* success */
62: *dstp = dst;
63: *ndstp = nsrc;
64: return 0;
65: }
66:
67: #define OPTIONS_CRITICAL 1
68: #define OPTIONS_EXTENSIONS 2
69: static int
70: cert_option_list(struct sshauthopt *opts, struct sshbuf *oblob,
71: u_int which, int crit)
72: {
73: char *command, *allowed;
74: char *name = NULL;
75: struct sshbuf *c = NULL, *data = NULL;
76: int r, ret = -1, found;
77:
78: if ((c = sshbuf_fromb(oblob)) == NULL) {
79: error("%s: sshbuf_fromb failed", __func__);
80: goto out;
81: }
82:
83: while (sshbuf_len(c) > 0) {
84: sshbuf_free(data);
85: data = NULL;
86: if ((r = sshbuf_get_cstring(c, &name, NULL)) != 0 ||
87: (r = sshbuf_froms(c, &data)) != 0) {
88: error("Unable to parse certificate options: %s",
89: ssh_err(r));
90: goto out;
91: }
92: debug3("found certificate option \"%.100s\" len %zu",
93: name, sshbuf_len(data));
94: found = 0;
95: if ((which & OPTIONS_EXTENSIONS) != 0) {
1.90 djm 96: if (strcmp(name, "no-touch-required") == 0) {
97: opts->no_require_user_presence = 1;
98: found = 1;
99: } else if (strcmp(name, "permit-X11-forwarding") == 0) {
1.75 djm 100: opts->permit_x11_forwarding_flag = 1;
101: found = 1;
102: } else if (strcmp(name,
103: "permit-agent-forwarding") == 0) {
104: opts->permit_agent_forwarding_flag = 1;
105: found = 1;
106: } else if (strcmp(name,
107: "permit-port-forwarding") == 0) {
108: opts->permit_port_forwarding_flag = 1;
109: found = 1;
110: } else if (strcmp(name, "permit-pty") == 0) {
111: opts->permit_pty_flag = 1;
112: found = 1;
113: } else if (strcmp(name, "permit-user-rc") == 0) {
114: opts->permit_user_rc = 1;
115: found = 1;
116: }
117: }
118: if (!found && (which & OPTIONS_CRITICAL) != 0) {
1.93 ! djm 119: if (strcmp(name, "verify-required") == 0) {
! 120: opts->require_verify = 1;
! 121: found = 1;
! 122: } else if (strcmp(name, "force-command") == 0) {
1.75 djm 123: if ((r = sshbuf_get_cstring(data, &command,
124: NULL)) != 0) {
125: error("Unable to parse \"%s\" "
126: "section: %s", name, ssh_err(r));
127: goto out;
128: }
129: if (opts->force_command != NULL) {
130: error("Certificate has multiple "
131: "force-command options");
132: free(command);
133: goto out;
134: }
135: opts->force_command = command;
136: found = 1;
1.93 ! djm 137: } else if (strcmp(name, "source-address") == 0) {
1.75 djm 138: if ((r = sshbuf_get_cstring(data, &allowed,
139: NULL)) != 0) {
140: error("Unable to parse \"%s\" "
141: "section: %s", name, ssh_err(r));
142: goto out;
143: }
144: if (opts->required_from_host_cert != NULL) {
145: error("Certificate has multiple "
146: "source-address options");
147: free(allowed);
148: goto out;
149: }
150: /* Check syntax */
151: if (addr_match_cidr_list(NULL, allowed) == -1) {
152: error("Certificate source-address "
153: "contents invalid");
154: goto out;
155: }
156: opts->required_from_host_cert = allowed;
157: found = 1;
158: }
159: }
160:
161: if (!found) {
162: if (crit) {
163: error("Certificate critical option \"%s\" "
164: "is not supported", name);
165: goto out;
166: } else {
167: logit("Certificate extension \"%s\" "
168: "is not supported", name);
169: }
170: } else if (sshbuf_len(data) != 0) {
171: error("Certificate option \"%s\" corrupt "
172: "(extra data)", name);
173: goto out;
174: }
175: free(name);
176: name = NULL;
177: }
178: /* successfully parsed all options */
179: ret = 0;
180:
181: out:
182: free(name);
183: sshbuf_free(data);
184: sshbuf_free(c);
185: return ret;
186: }
187:
188: struct sshauthopt *
189: sshauthopt_new(void)
190: {
191: struct sshauthopt *ret;
192:
193: if ((ret = calloc(1, sizeof(*ret))) == NULL)
194: return NULL;
195: ret->force_tun_device = -1;
196: return ret;
197: }
198:
199: void
200: sshauthopt_free(struct sshauthopt *opts)
201: {
202: size_t i;
203:
204: if (opts == NULL)
205: return;
206:
207: free(opts->cert_principals);
208: free(opts->force_command);
209: free(opts->required_from_host_cert);
210: free(opts->required_from_host_keys);
211:
212: for (i = 0; i < opts->nenv; i++)
213: free(opts->env[i]);
214: free(opts->env);
215:
216: for (i = 0; i < opts->npermitopen; i++)
217: free(opts->permitopen[i]);
218: free(opts->permitopen);
219:
1.80 djm 220: for (i = 0; i < opts->npermitlisten; i++)
221: free(opts->permitlisten[i]);
222: free(opts->permitlisten);
223:
1.91 jsg 224: freezero(opts, sizeof(*opts));
1.75 djm 225: }
226:
227: struct sshauthopt *
228: sshauthopt_new_with_keys_defaults(void)
229: {
230: struct sshauthopt *ret = NULL;
231:
232: if ((ret = sshauthopt_new()) == NULL)
233: return NULL;
234:
235: /* Defaults for authorized_keys flags */
236: ret->permit_port_forwarding_flag = 1;
237: ret->permit_agent_forwarding_flag = 1;
238: ret->permit_x11_forwarding_flag = 1;
239: ret->permit_pty_flag = 1;
240: ret->permit_user_rc = 1;
241: return ret;
242: }
243:
1.80 djm 244: /*
245: * Parse and record a permitopen/permitlisten directive.
246: * Return 0 on success. Return -1 on failure and sets *errstrp to error reason.
247: */
248: static int
1.83 djm 249: handle_permit(const char **optsp, int allow_bare_port,
250: char ***permitsp, size_t *npermitsp, const char **errstrp)
1.80 djm 251: {
252: char *opt, *tmp, *cp, *host, **permits = *permitsp;
253: size_t npermits = *npermitsp;
254: const char *errstr = "unknown error";
255:
1.86 djm 256: if (npermits > SSH_AUTHOPT_PERMIT_MAX) {
1.80 djm 257: *errstrp = "too many permission directives";
258: return -1;
259: }
1.82 djm 260: if ((opt = opt_dequote(optsp, &errstr)) == NULL) {
1.80 djm 261: return -1;
262: }
1.83 djm 263: if (allow_bare_port && strchr(opt, ':') == NULL) {
264: /*
265: * Allow a bare port number in permitlisten to indicate a
266: * listen_host wildcard.
267: */
1.85 deraadt 268: if (asprintf(&tmp, "*:%s", opt) == -1) {
1.89 dtucker 269: free(opt);
1.83 djm 270: *errstrp = "memory allocation failed";
271: return -1;
272: }
273: free(opt);
274: opt = tmp;
275: }
1.80 djm 276: if ((tmp = strdup(opt)) == NULL) {
277: free(opt);
278: *errstrp = "memory allocation failed";
279: return -1;
280: }
281: cp = tmp;
282: /* validate syntax before recording it. */
283: host = hpdelim(&cp);
284: if (host == NULL || strlen(host) >= NI_MAXHOST) {
285: free(tmp);
286: free(opt);
287: *errstrp = "invalid permission hostname";
288: return -1;
289: }
290: /*
291: * don't want to use permitopen_port to avoid
292: * dependency on channels.[ch] here.
293: */
294: if (cp == NULL ||
295: (strcmp(cp, "*") != 0 && a2port(cp) <= 0)) {
296: free(tmp);
297: free(opt);
298: *errstrp = "invalid permission port";
299: return -1;
300: }
301: /* XXX - add streamlocal support */
302: free(tmp);
303: /* Record it */
304: if ((permits = recallocarray(permits, npermits, npermits + 1,
305: sizeof(*permits))) == NULL) {
306: free(opt);
307: /* NB. don't update *permitsp if alloc fails */
308: *errstrp = "memory allocation failed";
309: return -1;
310: }
311: permits[npermits++] = opt;
312: *permitsp = permits;
313: *npermitsp = npermits;
314: return 0;
315: }
316:
1.75 djm 317: struct sshauthopt *
318: sshauthopt_parse(const char *opts, const char **errstrp)
319: {
1.80 djm 320: char **oarray, *opt, *cp, *tmp;
1.75 djm 321: int r;
322: struct sshauthopt *ret = NULL;
323: const char *errstr = "unknown error";
1.77 djm 324: uint64_t valid_before;
1.75 djm 325:
326: if (errstrp != NULL)
327: *errstrp = NULL;
328: if ((ret = sshauthopt_new_with_keys_defaults()) == NULL)
329: goto alloc_fail;
330:
331: if (opts == NULL)
332: return ret;
333:
334: while (*opts && *opts != ' ' && *opts != '\t') {
335: /* flag options */
336: if ((r = opt_flag("restrict", 0, &opts)) != -1) {
337: ret->restricted = 1;
338: ret->permit_port_forwarding_flag = 0;
339: ret->permit_agent_forwarding_flag = 0;
340: ret->permit_x11_forwarding_flag = 0;
341: ret->permit_pty_flag = 0;
342: ret->permit_user_rc = 0;
343: } else if ((r = opt_flag("cert-authority", 0, &opts)) != -1) {
344: ret->cert_authority = r;
345: } else if ((r = opt_flag("port-forwarding", 1, &opts)) != -1) {
346: ret->permit_port_forwarding_flag = r == 1;
347: } else if ((r = opt_flag("agent-forwarding", 1, &opts)) != -1) {
348: ret->permit_agent_forwarding_flag = r == 1;
349: } else if ((r = opt_flag("x11-forwarding", 1, &opts)) != -1) {
350: ret->permit_x11_forwarding_flag = r == 1;
1.90 djm 351: } else if ((r = opt_flag("touch-required", 1, &opts)) != -1) {
352: ret->no_require_user_presence = r != 1; /* NB. flip */
1.93 ! djm 353: } else if ((r = opt_flag("verify-required", 1, &opts)) != -1) {
! 354: ret->require_verify = r == 1;
1.75 djm 355: } else if ((r = opt_flag("pty", 1, &opts)) != -1) {
356: ret->permit_pty_flag = r == 1;
357: } else if ((r = opt_flag("user-rc", 1, &opts)) != -1) {
358: ret->permit_user_rc = r == 1;
359: } else if (opt_match(&opts, "command")) {
360: if (ret->force_command != NULL) {
361: errstr = "multiple \"command\" clauses";
362: goto fail;
363: }
364: ret->force_command = opt_dequote(&opts, &errstr);
365: if (ret->force_command == NULL)
366: goto fail;
367: } else if (opt_match(&opts, "principals")) {
368: if (ret->cert_principals != NULL) {
369: errstr = "multiple \"principals\" clauses";
370: goto fail;
371: }
372: ret->cert_principals = opt_dequote(&opts, &errstr);
373: if (ret->cert_principals == NULL)
374: goto fail;
375: } else if (opt_match(&opts, "from")) {
376: if (ret->required_from_host_keys != NULL) {
377: errstr = "multiple \"from\" clauses";
378: goto fail;
379: }
380: ret->required_from_host_keys = opt_dequote(&opts,
381: &errstr);
382: if (ret->required_from_host_keys == NULL)
383: goto fail;
1.78 djm 384: } else if (opt_match(&opts, "expiry-time")) {
1.77 djm 385: if ((opt = opt_dequote(&opts, &errstr)) == NULL)
386: goto fail;
387: if (parse_absolute_time(opt, &valid_before) != 0 ||
388: valid_before == 0) {
389: free(opt);
390: errstr = "invalid expires time";
391: goto fail;
392: }
393: free(opt);
394: if (ret->valid_before == 0 ||
395: valid_before < ret->valid_before)
396: ret->valid_before = valid_before;
1.75 djm 397: } else if (opt_match(&opts, "environment")) {
398: if (ret->nenv > INT_MAX) {
399: errstr = "too many environment strings";
400: goto fail;
401: }
402: if ((opt = opt_dequote(&opts, &errstr)) == NULL)
403: goto fail;
404: /* env name must be alphanumeric and followed by '=' */
405: if ((tmp = strchr(opt, '=')) == NULL) {
406: free(opt);
407: errstr = "invalid environment string";
408: goto fail;
409: }
1.84 djm 410: if ((cp = strdup(opt)) == NULL)
411: goto alloc_fail;
412: cp[tmp - opt] = '\0'; /* truncate at '=' */
413: if (!valid_env_name(cp)) {
414: free(cp);
415: free(opt);
416: errstr = "invalid environment string";
417: goto fail;
1.75 djm 418: }
1.84 djm 419: free(cp);
1.75 djm 420: /* Append it. */
421: oarray = ret->env;
422: if ((ret->env = recallocarray(ret->env, ret->nenv,
423: ret->nenv + 1, sizeof(*ret->env))) == NULL) {
424: free(opt);
425: ret->env = oarray; /* put it back for cleanup */
426: goto alloc_fail;
427: }
428: ret->env[ret->nenv++] = opt;
429: } else if (opt_match(&opts, "permitopen")) {
1.83 djm 430: if (handle_permit(&opts, 0, &ret->permitopen,
1.80 djm 431: &ret->npermitopen, &errstr) != 0)
1.75 djm 432: goto fail;
1.80 djm 433: } else if (opt_match(&opts, "permitlisten")) {
1.83 djm 434: if (handle_permit(&opts, 1, &ret->permitlisten,
1.80 djm 435: &ret->npermitlisten, &errstr) != 0)
1.75 djm 436: goto fail;
437: } else if (opt_match(&opts, "tunnel")) {
438: if ((opt = opt_dequote(&opts, &errstr)) == NULL)
439: goto fail;
440: ret->force_tun_device = a2tun(opt, NULL);
441: free(opt);
442: if (ret->force_tun_device == SSH_TUNID_ERR) {
443: errstr = "invalid tun device";
444: goto fail;
445: }
446: }
447: /*
448: * Skip the comma, and move to the next option
449: * (or break out if there are no more).
450: */
451: if (*opts == '\0' || *opts == ' ' || *opts == '\t')
452: break; /* End of options. */
453: /* Anything other than a comma is an unknown option */
454: if (*opts != ',') {
455: errstr = "unknown key option";
456: goto fail;
457: }
458: opts++;
459: if (*opts == '\0') {
460: errstr = "unexpected end-of-options";
461: goto fail;
462: }
463: }
464:
465: /* success */
466: if (errstrp != NULL)
467: *errstrp = NULL;
468: return ret;
469:
470: alloc_fail:
471: errstr = "memory allocation failed";
472: fail:
473: sshauthopt_free(ret);
474: if (errstrp != NULL)
475: *errstrp = errstr;
476: return NULL;
477: }
478:
479: struct sshauthopt *
480: sshauthopt_from_cert(struct sshkey *k)
481: {
482: struct sshauthopt *ret;
483:
484: if (k == NULL || !sshkey_type_is_cert(k->type) || k->cert == NULL ||
485: k->cert->type != SSH2_CERT_TYPE_USER)
486: return NULL;
487:
488: if ((ret = sshauthopt_new()) == NULL)
489: return NULL;
490:
491: /* Handle options and critical extensions separately */
492: if (cert_option_list(ret, k->cert->critical,
493: OPTIONS_CRITICAL, 1) == -1) {
494: sshauthopt_free(ret);
495: return NULL;
496: }
497: if (cert_option_list(ret, k->cert->extensions,
498: OPTIONS_EXTENSIONS, 0) == -1) {
499: sshauthopt_free(ret);
500: return NULL;
501: }
502: /* success */
503: return ret;
504: }
505:
506: /*
507: * Merges "additional" options to "primary" and returns the result.
508: * NB. Some options from primary have primacy.
509: */
510: struct sshauthopt *
511: sshauthopt_merge(const struct sshauthopt *primary,
512: const struct sshauthopt *additional, const char **errstrp)
513: {
514: struct sshauthopt *ret;
515: const char *errstr = "internal error";
516: const char *tmp;
517:
518: if (errstrp != NULL)
519: *errstrp = NULL;
520:
521: if ((ret = sshauthopt_new()) == NULL)
522: goto alloc_fail;
523:
524: /* cert_authority and cert_principals are cleared in result */
525:
526: /* Prefer access lists from primary. */
527: /* XXX err is both set and mismatch? */
528: tmp = primary->required_from_host_cert;
529: if (tmp == NULL)
530: tmp = additional->required_from_host_cert;
531: if (tmp != NULL && (ret->required_from_host_cert = strdup(tmp)) == NULL)
532: goto alloc_fail;
533: tmp = primary->required_from_host_keys;
534: if (tmp == NULL)
535: tmp = additional->required_from_host_keys;
536: if (tmp != NULL && (ret->required_from_host_keys = strdup(tmp)) == NULL)
537: goto alloc_fail;
538:
1.80 djm 539: /*
540: * force_tun_device, permitopen/permitlisten and environment all
541: * prefer the primary.
542: */
1.75 djm 543: ret->force_tun_device = primary->force_tun_device;
544: if (ret->force_tun_device == -1)
545: ret->force_tun_device = additional->force_tun_device;
546: if (primary->nenv > 0) {
547: if (dup_strings(&ret->env, &ret->nenv,
548: primary->env, primary->nenv) != 0)
549: goto alloc_fail;
550: } else if (additional->nenv) {
551: if (dup_strings(&ret->env, &ret->nenv,
552: additional->env, additional->nenv) != 0)
553: goto alloc_fail;
554: }
555: if (primary->npermitopen > 0) {
556: if (dup_strings(&ret->permitopen, &ret->npermitopen,
557: primary->permitopen, primary->npermitopen) != 0)
558: goto alloc_fail;
559: } else if (additional->npermitopen > 0) {
560: if (dup_strings(&ret->permitopen, &ret->npermitopen,
561: additional->permitopen, additional->npermitopen) != 0)
562: goto alloc_fail;
563: }
564:
1.80 djm 565: if (primary->npermitlisten > 0) {
566: if (dup_strings(&ret->permitlisten, &ret->npermitlisten,
567: primary->permitlisten, primary->npermitlisten) != 0)
568: goto alloc_fail;
569: } else if (additional->npermitlisten > 0) {
570: if (dup_strings(&ret->permitlisten, &ret->npermitlisten,
571: additional->permitlisten, additional->npermitlisten) != 0)
572: goto alloc_fail;
573: }
574:
1.90 djm 575: #define OPTFLAG_AND(x) ret->x = (primary->x == 1) && (additional->x == 1)
1.93 ! djm 576: #define OPTFLAG_OR(x) ret->x = (primary->x == 1) || (additional->x == 1)
1.90 djm 577: /* Permissive flags are logical-AND (i.e. must be set in both) */
578: OPTFLAG_AND(permit_port_forwarding_flag);
579: OPTFLAG_AND(permit_agent_forwarding_flag);
580: OPTFLAG_AND(permit_x11_forwarding_flag);
581: OPTFLAG_AND(permit_pty_flag);
582: OPTFLAG_AND(permit_user_rc);
583: OPTFLAG_AND(no_require_user_presence);
1.93 ! djm 584: /* Restrictive flags are logical-OR (i.e. must be set in either) */
! 585: OPTFLAG_OR(require_verify);
1.90 djm 586: #undef OPTFLAG_AND
1.75 djm 587:
1.77 djm 588: /* Earliest expiry time should win */
589: if (primary->valid_before != 0)
590: ret->valid_before = primary->valid_before;
591: if (additional->valid_before != 0 &&
592: additional->valid_before < ret->valid_before)
593: ret->valid_before = additional->valid_before;
594:
1.75 djm 595: /*
596: * When both multiple forced-command are specified, only
597: * proceed if they are identical, otherwise fail.
598: */
599: if (primary->force_command != NULL &&
600: additional->force_command != NULL) {
601: if (strcmp(primary->force_command,
602: additional->force_command) == 0) {
603: /* ok */
604: ret->force_command = strdup(primary->force_command);
605: if (ret->force_command == NULL)
606: goto alloc_fail;
607: } else {
608: errstr = "forced command options do not match";
609: goto fail;
610: }
611: } else if (primary->force_command != NULL) {
612: if ((ret->force_command = strdup(
613: primary->force_command)) == NULL)
614: goto alloc_fail;
615: } else if (additional->force_command != NULL) {
616: if ((ret->force_command = strdup(
617: additional->force_command)) == NULL)
618: goto alloc_fail;
619: }
620: /* success */
621: if (errstrp != NULL)
622: *errstrp = NULL;
623: return ret;
624:
625: alloc_fail:
626: errstr = "memory allocation failed";
627: fail:
628: if (errstrp != NULL)
629: *errstrp = errstr;
630: sshauthopt_free(ret);
631: return NULL;
632: }
633:
634: /*
635: * Copy options
636: */
637: struct sshauthopt *
638: sshauthopt_copy(const struct sshauthopt *orig)
639: {
640: struct sshauthopt *ret;
641:
642: if ((ret = sshauthopt_new()) == NULL)
643: return NULL;
644:
645: #define OPTSCALAR(x) ret->x = orig->x
646: OPTSCALAR(permit_port_forwarding_flag);
647: OPTSCALAR(permit_agent_forwarding_flag);
648: OPTSCALAR(permit_x11_forwarding_flag);
649: OPTSCALAR(permit_pty_flag);
650: OPTSCALAR(permit_user_rc);
651: OPTSCALAR(restricted);
652: OPTSCALAR(cert_authority);
653: OPTSCALAR(force_tun_device);
1.77 djm 654: OPTSCALAR(valid_before);
1.90 djm 655: OPTSCALAR(no_require_user_presence);
1.93 ! djm 656: OPTSCALAR(require_verify);
1.75 djm 657: #undef OPTSCALAR
658: #define OPTSTRING(x) \
659: do { \
660: if (orig->x != NULL && (ret->x = strdup(orig->x)) == NULL) { \
661: sshauthopt_free(ret); \
662: return NULL; \
663: } \
664: } while (0)
665: OPTSTRING(cert_principals);
666: OPTSTRING(force_command);
667: OPTSTRING(required_from_host_cert);
668: OPTSTRING(required_from_host_keys);
669: #undef OPTSTRING
670:
671: if (dup_strings(&ret->env, &ret->nenv, orig->env, orig->nenv) != 0 ||
672: dup_strings(&ret->permitopen, &ret->npermitopen,
1.80 djm 673: orig->permitopen, orig->npermitopen) != 0 ||
674: dup_strings(&ret->permitlisten, &ret->npermitlisten,
675: orig->permitlisten, orig->npermitlisten) != 0) {
1.75 djm 676: sshauthopt_free(ret);
677: return NULL;
678: }
679: return ret;
680: }
681:
682: static int
683: serialise_array(struct sshbuf *m, char **a, size_t n)
684: {
685: struct sshbuf *b;
686: size_t i;
687: int r;
688:
689: if (n > INT_MAX)
690: return SSH_ERR_INTERNAL_ERROR;
691:
692: if ((b = sshbuf_new()) == NULL) {
693: return SSH_ERR_ALLOC_FAIL;
694: }
695: for (i = 0; i < n; i++) {
696: if ((r = sshbuf_put_cstring(b, a[i])) != 0) {
697: sshbuf_free(b);
698: return r;
699: }
700: }
701: if ((r = sshbuf_put_u32(m, n)) != 0 ||
702: (r = sshbuf_put_stringb(m, b)) != 0) {
703: sshbuf_free(b);
704: return r;
705: }
706: /* success */
707: return 0;
708: }
709:
710: static int
711: deserialise_array(struct sshbuf *m, char ***ap, size_t *np)
712: {
713: char **a = NULL;
714: size_t i, n = 0;
715: struct sshbuf *b = NULL;
716: u_int tmp;
717: int r = SSH_ERR_INTERNAL_ERROR;
718:
719: if ((r = sshbuf_get_u32(m, &tmp)) != 0 ||
720: (r = sshbuf_froms(m, &b)) != 0)
721: goto out;
722: if (tmp > INT_MAX) {
723: r = SSH_ERR_INVALID_FORMAT;
724: goto out;
725: }
726: n = tmp;
727: if (n > 0 && (a = calloc(n, sizeof(*a))) == NULL) {
728: r = SSH_ERR_ALLOC_FAIL;
729: goto out;
730: }
731: for (i = 0; i < n; i++) {
732: if ((r = sshbuf_get_cstring(b, &a[i], NULL)) != 0)
733: goto out;
734: }
735: /* success */
736: r = 0;
737: *ap = a;
738: a = NULL;
739: *np = n;
740: n = 0;
741: out:
1.92 markus 742: if (a != NULL) {
743: for (i = 0; i < n; i++)
744: free(a[i]);
745: free(a);
746: }
1.75 djm 747: sshbuf_free(b);
748: return r;
749: }
750:
751: static int
752: serialise_nullable_string(struct sshbuf *m, const char *s)
753: {
754: int r;
755:
756: if ((r = sshbuf_put_u8(m, s == NULL)) != 0 ||
757: (r = sshbuf_put_cstring(m, s)) != 0)
758: return r;
759: return 0;
760: }
761:
762: static int
763: deserialise_nullable_string(struct sshbuf *m, char **sp)
764: {
765: int r;
766: u_char flag;
767:
768: *sp = NULL;
769: if ((r = sshbuf_get_u8(m, &flag)) != 0 ||
770: (r = sshbuf_get_cstring(m, flag ? NULL : sp, NULL)) != 0)
771: return r;
772: return 0;
773: }
774:
775: int
776: sshauthopt_serialise(const struct sshauthopt *opts, struct sshbuf *m,
777: int untrusted)
778: {
779: int r = SSH_ERR_INTERNAL_ERROR;
780:
1.90 djm 781: /* Flag options */
1.75 djm 782: if ((r = sshbuf_put_u8(m, opts->permit_port_forwarding_flag)) != 0 ||
783: (r = sshbuf_put_u8(m, opts->permit_agent_forwarding_flag)) != 0 ||
784: (r = sshbuf_put_u8(m, opts->permit_x11_forwarding_flag)) != 0 ||
785: (r = sshbuf_put_u8(m, opts->permit_pty_flag)) != 0 ||
786: (r = sshbuf_put_u8(m, opts->permit_user_rc)) != 0 ||
787: (r = sshbuf_put_u8(m, opts->restricted)) != 0 ||
1.77 djm 788: (r = sshbuf_put_u8(m, opts->cert_authority)) != 0 ||
1.93 ! djm 789: (r = sshbuf_put_u8(m, opts->no_require_user_presence)) != 0 ||
! 790: (r = sshbuf_put_u8(m, opts->require_verify)) != 0)
1.90 djm 791: return r;
792:
793: /* Simple integer options */
794: if ((r = sshbuf_put_u64(m, opts->valid_before)) != 0)
1.75 djm 795: return r;
796:
797: /* tunnel number can be negative to indicate "unset" */
798: if ((r = sshbuf_put_u8(m, opts->force_tun_device == -1)) != 0 ||
799: (r = sshbuf_put_u32(m, (opts->force_tun_device < 0) ?
800: 0 : (u_int)opts->force_tun_device)) != 0)
801: return r;
802:
803: /* String options; these may be NULL */
804: if ((r = serialise_nullable_string(m,
805: untrusted ? "yes" : opts->cert_principals)) != 0 ||
806: (r = serialise_nullable_string(m,
807: untrusted ? "true" : opts->force_command)) != 0 ||
808: (r = serialise_nullable_string(m,
809: untrusted ? NULL : opts->required_from_host_cert)) != 0 ||
810: (r = serialise_nullable_string(m,
811: untrusted ? NULL : opts->required_from_host_keys)) != 0)
812: return r;
813:
814: /* Array options */
815: if ((r = serialise_array(m, opts->env,
816: untrusted ? 0 : opts->nenv)) != 0 ||
817: (r = serialise_array(m, opts->permitopen,
1.82 djm 818: untrusted ? 0 : opts->npermitopen)) != 0 ||
1.80 djm 819: (r = serialise_array(m, opts->permitlisten,
820: untrusted ? 0 : opts->npermitlisten)) != 0)
1.75 djm 821: return r;
822:
823: /* success */
824: return 0;
825: }
826:
827: int
828: sshauthopt_deserialise(struct sshbuf *m, struct sshauthopt **optsp)
829: {
830: struct sshauthopt *opts = NULL;
831: int r = SSH_ERR_INTERNAL_ERROR;
832: u_char f;
833: u_int tmp;
834:
835: if ((opts = calloc(1, sizeof(*opts))) == NULL)
836: return SSH_ERR_ALLOC_FAIL;
837:
1.90 djm 838: /* Flag options */
1.75 djm 839: #define OPT_FLAG(x) \
840: do { \
841: if ((r = sshbuf_get_u8(m, &f)) != 0) \
842: goto out; \
843: opts->x = f; \
844: } while (0)
845: OPT_FLAG(permit_port_forwarding_flag);
846: OPT_FLAG(permit_agent_forwarding_flag);
847: OPT_FLAG(permit_x11_forwarding_flag);
848: OPT_FLAG(permit_pty_flag);
849: OPT_FLAG(permit_user_rc);
850: OPT_FLAG(restricted);
851: OPT_FLAG(cert_authority);
1.90 djm 852: OPT_FLAG(no_require_user_presence);
1.93 ! djm 853: OPT_FLAG(require_verify);
1.75 djm 854: #undef OPT_FLAG
1.77 djm 855:
1.90 djm 856: /* Simple integer options */
1.77 djm 857: if ((r = sshbuf_get_u64(m, &opts->valid_before)) != 0)
858: goto out;
1.75 djm 859:
860: /* tunnel number can be negative to indicate "unset" */
861: if ((r = sshbuf_get_u8(m, &f)) != 0 ||
862: (r = sshbuf_get_u32(m, &tmp)) != 0)
863: goto out;
864: opts->force_tun_device = f ? -1 : (int)tmp;
865:
866: /* String options may be NULL */
867: if ((r = deserialise_nullable_string(m, &opts->cert_principals)) != 0 ||
868: (r = deserialise_nullable_string(m, &opts->force_command)) != 0 ||
869: (r = deserialise_nullable_string(m,
870: &opts->required_from_host_cert)) != 0 ||
871: (r = deserialise_nullable_string(m,
872: &opts->required_from_host_keys)) != 0)
873: goto out;
874:
875: /* Array options */
876: if ((r = deserialise_array(m, &opts->env, &opts->nenv)) != 0 ||
877: (r = deserialise_array(m,
1.80 djm 878: &opts->permitopen, &opts->npermitopen)) != 0 ||
879: (r = deserialise_array(m,
880: &opts->permitlisten, &opts->npermitlisten)) != 0)
1.75 djm 881: goto out;
882:
883: /* success */
884: r = 0;
885: *optsp = opts;
886: opts = NULL;
887: out:
888: sshauthopt_free(opts);
889: return r;
890: }