Annotation of src/usr.bin/ssh/hostfile.c, Revision 1.61
1.61 ! djm 1: /* $OpenBSD: hostfile.c,v 1.60 2015/01/18 21:40:23 djm Exp $ */
1.1 deraadt 2: /*
1.8 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
6: * Functions for manipulating the known hosts files.
1.16 markus 7: *
1.20 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".
13: *
14: *
1.28 markus 15: * Copyright (c) 1999, 2000 Markus Friedl. All rights reserved.
1.20 deraadt 16: * Copyright (c) 1999 Niels Provos. All rights reserved.
17: *
18: * Redistribution and use in source and binary forms, with or without
19: * modification, are permitted provided that the following conditions
20: * are met:
21: * 1. Redistributions of source code must retain the above copyright
22: * notice, this list of conditions and the following disclaimer.
23: * 2. Redistributions in binary form must reproduce the above copyright
24: * notice, this list of conditions and the following disclaimer in the
25: * documentation and/or other materials provided with the distribution.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
28: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
29: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
30: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
31: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
32: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
36: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.8 deraadt 37: */
1.1 deraadt 38:
1.41 stevesk 39: #include <sys/types.h>
40:
41: #include <netinet/in.h>
1.33 djm 42:
1.60 djm 43: #include <errno.h>
1.33 djm 44: #include <resolv.h>
1.44 stevesk 45: #include <stdio.h>
1.43 stevesk 46: #include <stdlib.h>
1.42 stevesk 47: #include <string.h>
1.57 djm 48: #include <stdarg.h>
1.1 deraadt 49:
1.45 deraadt 50: #include "xmalloc.h"
1.14 markus 51: #include "match.h"
1.59 djm 52: #include "sshkey.h"
1.14 markus 53: #include "hostfile.h"
1.24 markus 54: #include "log.h"
1.49 djm 55: #include "misc.h"
1.59 djm 56: #include "ssherr.h"
1.53 djm 57: #include "digest.h"
1.54 markus 58: #include "hmac.h"
1.49 djm 59:
60: struct hostkeys {
61: struct hostkey_entry *entries;
62: u_int num_entries;
63: };
1.33 djm 64:
1.60 djm 65: /* XXX hmac is too easy to dictionary attack; use bcrypt? */
66:
1.33 djm 67: static int
1.52 djm 68: extract_salt(const char *s, u_int l, u_char *salt, size_t salt_len)
1.33 djm 69: {
70: char *p, *b64salt;
71: u_int b64len;
72: int ret;
73:
74: if (l < sizeof(HASH_MAGIC) - 1) {
75: debug2("extract_salt: string too short");
76: return (-1);
77: }
78: if (strncmp(s, HASH_MAGIC, sizeof(HASH_MAGIC) - 1) != 0) {
79: debug2("extract_salt: invalid magic identifier");
80: return (-1);
81: }
82: s += sizeof(HASH_MAGIC) - 1;
83: l -= sizeof(HASH_MAGIC) - 1;
84: if ((p = memchr(s, HASH_DELIM, l)) == NULL) {
85: debug2("extract_salt: missing salt termination character");
86: return (-1);
87: }
88:
89: b64len = p - s;
90: /* Sanity check */
91: if (b64len == 0 || b64len > 1024) {
92: debug2("extract_salt: bad encoded salt length %u", b64len);
93: return (-1);
94: }
95: b64salt = xmalloc(1 + b64len);
96: memcpy(b64salt, s, b64len);
97: b64salt[b64len] = '\0';
98:
99: ret = __b64_pton(b64salt, salt, salt_len);
1.51 djm 100: free(b64salt);
1.33 djm 101: if (ret == -1) {
102: debug2("extract_salt: salt decode error");
103: return (-1);
104: }
1.54 markus 105: if (ret != (int)ssh_hmac_bytes(SSH_DIGEST_SHA1)) {
106: debug2("extract_salt: expected salt len %zd, got %d",
107: ssh_hmac_bytes(SSH_DIGEST_SHA1), ret);
1.33 djm 108: return (-1);
109: }
1.34 deraadt 110:
1.33 djm 111: return (0);
112: }
113:
114: char *
115: host_hash(const char *host, const char *name_from_hostfile, u_int src_len)
116: {
1.54 markus 117: struct ssh_hmac_ctx *ctx;
1.52 djm 118: u_char salt[256], result[256];
119: char uu_salt[512], uu_result[512];
1.33 djm 120: static char encoded[1024];
121: u_int i, len;
122:
1.54 markus 123: len = ssh_digest_bytes(SSH_DIGEST_SHA1);
1.33 djm 124:
125: if (name_from_hostfile == NULL) {
126: /* Create new salt */
127: for (i = 0; i < len; i++)
128: salt[i] = arc4random();
129: } else {
130: /* Extract salt from known host entry */
131: if (extract_salt(name_from_hostfile, src_len, salt,
132: sizeof(salt)) == -1)
133: return (NULL);
134: }
135:
1.54 markus 136: if ((ctx = ssh_hmac_start(SSH_DIGEST_SHA1)) == NULL ||
137: ssh_hmac_init(ctx, salt, len) < 0 ||
138: ssh_hmac_update(ctx, host, strlen(host)) < 0 ||
139: ssh_hmac_final(ctx, result, sizeof(result)))
140: fatal("%s: ssh_hmac failed", __func__);
141: ssh_hmac_free(ctx);
1.33 djm 142:
1.34 deraadt 143: if (__b64_ntop(salt, len, uu_salt, sizeof(uu_salt)) == -1 ||
1.33 djm 144: __b64_ntop(result, len, uu_result, sizeof(uu_result)) == -1)
1.54 markus 145: fatal("%s: __b64_ntop failed", __func__);
1.33 djm 146:
147: snprintf(encoded, sizeof(encoded), "%s%s%c%s", HASH_MAGIC, uu_salt,
148: HASH_DELIM, uu_result);
149:
150: return (encoded);
151: }
1.1 deraadt 152:
1.9 markus 153: /*
1.14 markus 154: * Parses an RSA (number of bits, e, n) or DSA key from a string. Moves the
155: * pointer over the key. Skips any whitespace at the beginning and at end.
1.9 markus 156: */
1.1 deraadt 157:
1.29 jakob 158: int
1.59 djm 159: hostfile_read_key(char **cpp, u_int *bitsp, struct sshkey *ret)
1.1 deraadt 160: {
1.7 markus 161: char *cp;
1.59 djm 162: int r;
1.7 markus 163:
164: /* Skip leading whitespace. */
1.9 markus 165: for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
166: ;
1.1 deraadt 167:
1.59 djm 168: if ((r = sshkey_read(ret, &cp)) != 0)
1.7 markus 169: return 0;
170:
171: /* Skip trailing whitespace. */
1.9 markus 172: for (; *cp == ' ' || *cp == '\t'; cp++)
173: ;
1.7 markus 174:
175: /* Return results. */
176: *cpp = cp;
1.59 djm 177: if (bitsp != NULL)
178: *bitsp = sshkey_size(ret);
1.7 markus 179: return 1;
1.14 markus 180: }
1.1 deraadt 181:
1.27 itojun 182: static int
1.59 djm 183: hostfile_check_key(int bits, const struct sshkey *key, const char *host,
1.49 djm 184: const char *filename, u_long linenum)
1.1 deraadt 185: {
1.56 markus 186: #ifdef WITH_SSH1
1.21 markus 187: if (key == NULL || key->type != KEY_RSA1 || key->rsa == NULL)
1.14 markus 188: return 1;
189: if (bits != BN_num_bits(key->rsa->n)) {
1.49 djm 190: logit("Warning: %s, line %lu: keysize mismatch for host %s: "
1.14 markus 191: "actual %d vs. announced %d.",
192: filename, linenum, host, BN_num_bits(key->rsa->n), bits);
1.49 djm 193: logit("Warning: replace %d with %d in %s, line %lu.",
1.14 markus 194: bits, BN_num_bits(key->rsa->n), filename, linenum);
1.1 deraadt 195: }
1.56 markus 196: #endif
1.14 markus 197: return 1;
1.1 deraadt 198: }
199:
1.49 djm 200: static HostkeyMarker
1.48 djm 201: check_markers(char **cpp)
202: {
203: char marker[32], *sp, *cp = *cpp;
204: int ret = MRK_NONE;
205:
206: while (*cp == '@') {
207: /* Only one marker is allowed */
208: if (ret != MRK_NONE)
209: return MRK_ERROR;
210: /* Markers are terminated by whitespace */
211: if ((sp = strchr(cp, ' ')) == NULL &&
212: (sp = strchr(cp, '\t')) == NULL)
213: return MRK_ERROR;
214: /* Extract marker for comparison */
215: if (sp <= cp + 1 || sp >= cp + sizeof(marker))
216: return MRK_ERROR;
217: memcpy(marker, cp, sp - cp);
218: marker[sp - cp] = '\0';
219: if (strcmp(marker, CA_MARKER) == 0)
220: ret = MRK_CA;
221: else if (strcmp(marker, REVOKE_MARKER) == 0)
222: ret = MRK_REVOKE;
223: else
224: return MRK_ERROR;
225:
226: /* Skip past marker and any whitespace that follows it */
227: cp = sp;
228: for (; *cp == ' ' || *cp == '\t'; cp++)
229: ;
230: }
231: *cpp = cp;
232: return ret;
233: }
234:
1.49 djm 235: struct hostkeys *
236: init_hostkeys(void)
237: {
238: struct hostkeys *ret = xcalloc(1, sizeof(*ret));
239:
240: ret->entries = NULL;
241: return ret;
242: }
1.1 deraadt 243:
1.61 ! djm 244: struct load_callback_ctx {
! 245: const char *host;
! 246: u_long num_loaded;
! 247: struct hostkeys *hostkeys;
! 248: };
! 249:
! 250: static int
! 251: record_hostkey(struct hostkey_foreach_line *l, void *_ctx)
1.1 deraadt 252: {
1.61 ! djm 253: struct load_callback_ctx *ctx = (struct load_callback_ctx *)_ctx;
! 254: struct hostkeys *hostkeys = ctx->hostkeys;
! 255: struct hostkey_entry *tmp;
! 256:
! 257: if (l->status == HKF_STATUS_INVALID) {
! 258: error("%s:%ld: parse error in hostkeys file",
! 259: l->path, l->linenum);
! 260: return 0;
! 261: }
1.7 markus 262:
1.61 ! djm 263: debug3("%s: found %skey type %s in file %s:%lu", __func__,
! 264: l->marker == MRK_NONE ? "" :
! 265: (l->marker == MRK_CA ? "ca " : "revoked "),
! 266: sshkey_type(l->key), l->path, l->linenum);
! 267: if ((tmp = reallocarray(hostkeys->entries,
! 268: hostkeys->num_entries + 1, sizeof(*hostkeys->entries))) == NULL)
! 269: return SSH_ERR_ALLOC_FAIL;
! 270: hostkeys->entries = tmp;
! 271: hostkeys->entries[hostkeys->num_entries].host = xstrdup(ctx->host);
! 272: hostkeys->entries[hostkeys->num_entries].file = xstrdup(l->path);
! 273: hostkeys->entries[hostkeys->num_entries].line = l->linenum;
! 274: hostkeys->entries[hostkeys->num_entries].key = l->key;
! 275: l->key = NULL; /* steal it */
! 276: hostkeys->entries[hostkeys->num_entries].marker = l->marker;
! 277: hostkeys->num_entries++;
! 278: ctx->num_loaded++;
1.7 markus 279:
1.61 ! djm 280: return 0;
! 281: }
1.47 djm 282:
1.61 ! djm 283: void
! 284: load_hostkeys(struct hostkeys *hostkeys, const char *host, const char *path)
! 285: {
! 286: int r;
! 287: struct load_callback_ctx ctx;
1.7 markus 288:
1.61 ! djm 289: ctx.host = host;
! 290: ctx.num_loaded = 0;
! 291: ctx.hostkeys = hostkeys;
! 292:
! 293: if ((r = hostkeys_foreach(path, record_hostkey, &ctx, host,
! 294: HKF_WANT_MATCH_HOST|HKF_WANT_PARSE_KEY)) != 0) {
! 295: if (r != SSH_ERR_SYSTEM_ERROR && errno != ENOENT)
! 296: debug("%s: hostkeys_foreach failed for %s: %s",
! 297: __func__, path, ssh_err(r));
! 298: }
! 299: if (ctx.num_loaded != 0)
! 300: debug3("%s: loaded %lu keys from %s", __func__,
! 301: ctx.num_loaded, host);
1.58 djm 302: }
1.49 djm 303:
304: void
305: free_hostkeys(struct hostkeys *hostkeys)
306: {
307: u_int i;
308:
309: for (i = 0; i < hostkeys->num_entries; i++) {
1.51 djm 310: free(hostkeys->entries[i].host);
311: free(hostkeys->entries[i].file);
1.59 djm 312: sshkey_free(hostkeys->entries[i].key);
1.55 tedu 313: explicit_bzero(hostkeys->entries + i, sizeof(*hostkeys->entries));
1.49 djm 314: }
1.51 djm 315: free(hostkeys->entries);
1.55 tedu 316: explicit_bzero(hostkeys, sizeof(*hostkeys));
1.51 djm 317: free(hostkeys);
1.49 djm 318: }
319:
320: static int
1.59 djm 321: check_key_not_revoked(struct hostkeys *hostkeys, struct sshkey *k)
1.49 djm 322: {
1.59 djm 323: int is_cert = sshkey_is_cert(k);
1.49 djm 324: u_int i;
1.7 markus 325:
1.49 djm 326: for (i = 0; i < hostkeys->num_entries; i++) {
327: if (hostkeys->entries[i].marker != MRK_REVOKE)
1.30 markus 328: continue;
1.59 djm 329: if (sshkey_equal_public(k, hostkeys->entries[i].key))
1.49 djm 330: return -1;
331: if (is_cert &&
1.59 djm 332: sshkey_equal_public(k->cert->signature_key,
1.49 djm 333: hostkeys->entries[i].key))
334: return -1;
335: }
336: return 0;
337: }
338:
339: /*
340: * Match keys against a specified key, or look one up by key type.
341: *
342: * If looking for a keytype (key == NULL) and one is found then return
343: * HOST_FOUND, otherwise HOST_NEW.
344: *
345: * If looking for a key (key != NULL):
346: * 1. If the key is a cert and a matching CA is found, return HOST_OK
347: * 2. If the key is not a cert and a matching key is found, return HOST_OK
348: * 3. If no key matches but a key with a different type is found, then
349: * return HOST_CHANGED
350: * 4. If no matching keys are found, then return HOST_NEW.
351: *
352: * Finally, check any found key is not revoked.
353: */
354: static HostStatus
355: check_hostkeys_by_key_or_type(struct hostkeys *hostkeys,
1.59 djm 356: struct sshkey *k, int keytype, const struct hostkey_entry **found)
1.49 djm 357: {
358: u_int i;
359: HostStatus end_return = HOST_NEW;
1.59 djm 360: int want_cert = sshkey_is_cert(k);
1.49 djm 361: HostkeyMarker want_marker = want_cert ? MRK_CA : MRK_NONE;
362: int proto = (k ? k->type : keytype) == KEY_RSA1 ? 1 : 2;
363:
364: if (found != NULL)
365: *found = NULL;
1.30 markus 366:
1.49 djm 367: for (i = 0; i < hostkeys->num_entries; i++) {
368: if (proto == 1 && hostkeys->entries[i].key->type != KEY_RSA1)
369: continue;
370: if (proto == 2 && hostkeys->entries[i].key->type == KEY_RSA1)
1.30 markus 371: continue;
1.49 djm 372: if (hostkeys->entries[i].marker != want_marker)
373: continue;
374: if (k == NULL) {
375: if (hostkeys->entries[i].key->type != keytype)
376: continue;
377: end_return = HOST_FOUND;
378: if (found != NULL)
379: *found = hostkeys->entries + i;
380: k = hostkeys->entries[i].key;
381: break;
382: }
383: if (want_cert) {
1.59 djm 384: if (sshkey_equal_public(k->cert->signature_key,
1.49 djm 385: hostkeys->entries[i].key)) {
386: /* A matching CA exists */
387: end_return = HOST_OK;
388: if (found != NULL)
389: *found = hostkeys->entries + i;
390: break;
1.48 djm 391: }
1.49 djm 392: } else {
1.59 djm 393: if (sshkey_equal(k, hostkeys->entries[i].key)) {
1.49 djm 394: end_return = HOST_OK;
395: if (found != NULL)
396: *found = hostkeys->entries + i;
397: break;
1.48 djm 398: }
1.49 djm 399: /* A non-maching key exists */
400: end_return = HOST_CHANGED;
401: if (found != NULL)
402: *found = hostkeys->entries + i;
1.48 djm 403: }
1.1 deraadt 404: }
1.49 djm 405: if (check_key_not_revoked(hostkeys, k) != 0) {
406: end_return = HOST_REVOKED;
407: if (found != NULL)
408: *found = NULL;
409: }
1.7 markus 410: return end_return;
1.30 markus 411: }
1.58 djm 412:
1.30 markus 413: HostStatus
1.59 djm 414: check_key_in_hostkeys(struct hostkeys *hostkeys, struct sshkey *key,
1.49 djm 415: const struct hostkey_entry **found)
1.30 markus 416: {
417: if (key == NULL)
418: fatal("no key to look up");
1.49 djm 419: return check_hostkeys_by_key_or_type(hostkeys, key, 0, found);
1.30 markus 420: }
421:
422: int
1.49 djm 423: lookup_key_in_hostkeys_by_type(struct hostkeys *hostkeys, int keytype,
424: const struct hostkey_entry **found)
1.30 markus 425: {
1.49 djm 426: return (check_hostkeys_by_key_or_type(hostkeys, NULL, keytype,
427: found) == HOST_FOUND);
1.1 deraadt 428: }
429:
1.9 markus 430: /*
431: * Appends an entry to the host file. Returns false if the entry could not
432: * be appended.
433: */
1.2 provos 434: int
1.59 djm 435: add_host_to_hostfile(const char *filename, const char *host,
436: const struct sshkey *key, int store_hash)
1.1 deraadt 437: {
1.7 markus 438: FILE *f;
1.59 djm 439: int r, success = 0;
1.35 dtucker 440: char *hashed_host = NULL;
1.33 djm 441:
1.14 markus 442: if (key == NULL)
1.17 markus 443: return 1; /* XXX ? */
1.7 markus 444: f = fopen(filename, "a");
445: if (!f)
446: return 0;
1.33 djm 447:
448: if (store_hash) {
449: if ((hashed_host = host_hash(host, NULL, 0)) == NULL) {
1.61 ! djm 450: error("%s: host_hash failed", __func__);
1.33 djm 451: fclose(f);
452: return 0;
453: }
454: }
455: fprintf(f, "%s ", store_hash ? hashed_host : host);
456:
1.59 djm 457: if ((r = sshkey_write(key, f)) != 0) {
458: error("%s: saving key in %s failed: %s",
459: __func__, filename, ssh_err(r));
460: } else
1.14 markus 461: success = 1;
1.60 djm 462: fputc('\n', f);
1.7 markus 463: fclose(f);
1.14 markus 464: return success;
1.60 djm 465: }
466:
467: static int
468: match_maybe_hashed(const char *host, const char *names, int *was_hashed)
469: {
470: int hashed = *names == HASH_DELIM;
471: const char *hashed_host;
472: size_t nlen = strlen(names);
473:
474: if (was_hashed != NULL)
475: *was_hashed = hashed;
476: if (hashed) {
477: if ((hashed_host = host_hash(host, names, nlen)) == NULL)
478: return -1;
479: return nlen == strlen(hashed_host) &&
480: strncmp(hashed_host, names, nlen) == 0;
481: }
482: return match_hostname(host, names, nlen) == 1;
483: }
484:
485: int
486: hostkeys_foreach(const char *path, hostkeys_foreach_fn *callback, void *ctx,
487: const char *host, u_int options)
488: {
489: FILE *f;
490: char line[8192], oline[8192];
491: u_long linenum = 0;
492: char *cp, *cp2;
493: u_int kbits;
494: int s, r = 0;
495: struct hostkey_foreach_line lineinfo;
496:
497: memset(&lineinfo, 0, sizeof(lineinfo));
498: if (host == NULL && (options & HKF_WANT_MATCH_HOST) != 0)
499: return SSH_ERR_INVALID_ARGUMENT;
500: if ((f = fopen(path, "r")) == NULL)
501: return SSH_ERR_SYSTEM_ERROR;
502:
503: debug3("%s: reading file \"%s\"", __func__, path);
504: while (read_keyfile_line(f, path, line, sizeof(line), &linenum) == 0) {
505: line[strcspn(line, "\n")] = '\0';
506: strlcpy(oline, line, sizeof(oline));
507:
508: sshkey_free(lineinfo.key);
509: memset(&lineinfo, 0, sizeof(lineinfo));
510: lineinfo.path = path;
511: lineinfo.linenum = linenum;
512: lineinfo.line = oline;
513: lineinfo.status = HKF_STATUS_OK;
514:
515: /* Skip any leading whitespace, comments and empty lines. */
516: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
517: ;
518: if (!*cp || *cp == '#' || *cp == '\n') {
519: if ((options & HKF_WANT_MATCH_HOST) == 0) {
520: lineinfo.status = HKF_STATUS_COMMENT;
521: if ((r = callback(&lineinfo, ctx)) != 0)
522: break;
523: }
524: continue;
525: }
526:
527: if ((lineinfo.marker = check_markers(&cp)) == MRK_ERROR) {
528: verbose("%s: invalid marker at %s:%lu",
529: __func__, path, linenum);
530: if ((options & HKF_WANT_MATCH_HOST) == 0)
531: goto bad;
532: continue;
533: }
534:
535: /* Find the end of the host name portion. */
536: for (cp2 = cp; *cp2 && *cp2 != ' ' && *cp2 != '\t'; cp2++)
537: ;
538: lineinfo.hosts = cp;
539: *cp2++ = '\0';
540:
541: /* Check if the host name matches. */
542: if (host != NULL) {
543: s = match_maybe_hashed(host, lineinfo.hosts,
544: &lineinfo.was_hashed);
545: if (s == 1)
546: lineinfo.status = HKF_STATUS_HOST_MATCHED;
547: else if ((options & HKF_WANT_MATCH_HOST) != 0)
548: continue;
549: else if (s == -1) {
550: debug2("%s: %s:%ld: bad host hash \"%.32s\"",
551: __func__, path, linenum, lineinfo.hosts);
552: goto bad;
553: }
554: }
555:
556: /* Got a match. Skip host name and any following whitespace */
557: for (; *cp2 == ' ' || *cp2 == '\t'; cp2++)
558: ;
559: if (*cp2 == '\0' || *cp2 == '#') {
560: debug2("%s:%ld: truncated before key", path, linenum);
561: goto bad;
562: }
563: lineinfo.rawkey = cp = cp2;
564:
565: if ((options & HKF_WANT_PARSE_KEY) != 0) {
566: /*
567: * Extract the key from the line. This will skip
568: * any leading whitespace. Ignore badly formatted
569: * lines.
570: */
571: if ((lineinfo.key = sshkey_new(KEY_UNSPEC)) == NULL) {
572: error("%s: sshkey_new failed", __func__);
573: return SSH_ERR_ALLOC_FAIL;
574: }
575: if (!hostfile_read_key(&cp, &kbits, lineinfo.key)) {
576: #ifdef WITH_SSH1
577: sshkey_free(lineinfo.key);
578: lineinfo.key = sshkey_new(KEY_RSA1);
579: if (lineinfo.key == NULL) {
580: error("%s: sshkey_new fail", __func__);
581: return SSH_ERR_ALLOC_FAIL;
582: }
583: if (!hostfile_read_key(&cp, &kbits,
584: lineinfo.key))
585: goto bad;
586: #else
587: goto bad;
588: #endif
589: }
590: if (!hostfile_check_key(kbits, lineinfo.key, host,
591: path, linenum)) {
592: bad:
593: lineinfo.status = HKF_STATUS_INVALID;
594: if ((r = callback(&lineinfo, ctx)) != 0)
595: break;
596: continue;
597: }
598: }
599: if ((r = callback(&lineinfo, ctx)) != 0)
600: break;
601: }
602: sshkey_free(lineinfo.key);
603: fclose(f);
604: return r;
1.1 deraadt 605: }
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