Annotation of src/usr.bin/ssh/auth2.c, Revision 1.28
1.1 markus 1: /*
2: * Copyright (c) 2000 Markus Friedl. All rights reserved.
3: *
4: * Redistribution and use in source and binary forms, with or without
5: * modification, are permitted provided that the following conditions
6: * are met:
7: * 1. Redistributions of source code must retain the above copyright
8: * notice, this list of conditions and the following disclaimer.
9: * 2. Redistributions in binary form must reproduce the above copyright
10: * notice, this list of conditions and the following disclaimer in the
11: * documentation and/or other materials provided with the distribution.
12: *
13: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23: */
1.14 deraadt 24:
1.1 markus 25: #include "includes.h"
1.28 ! markus 26: RCSID("$OpenBSD: auth2.c,v 1.27 2001/01/13 18:56:48 markus Exp $");
1.1 markus 27:
28: #include <openssl/dsa.h>
29: #include <openssl/rsa.h>
30: #include <openssl/evp.h>
31:
32: #include "xmalloc.h"
33: #include "rsa.h"
34: #include "ssh.h"
35: #include "pty.h"
36: #include "packet.h"
37: #include "buffer.h"
38: #include "servconf.h"
39: #include "compat.h"
40: #include "channels.h"
41: #include "bufaux.h"
42: #include "ssh2.h"
43: #include "auth.h"
44: #include "session.h"
45: #include "dispatch.h"
46: #include "auth.h"
47: #include "key.h"
48: #include "kex.h"
49:
50: #include "uidswap.h"
1.10 markus 51: #include "auth-options.h"
1.1 markus 52:
53: /* import */
54: extern ServerOptions options;
1.23 markus 55: extern u_char *session_id2;
1.1 markus 56: extern int session_id2_len;
57:
1.18 markus 58: static Authctxt *x_authctxt = NULL;
59: static int one = 1;
60:
61: typedef struct Authmethod Authmethod;
62: struct Authmethod {
63: char *name;
64: int (*userauth)(Authctxt *authctxt);
65: int *enabled;
66: };
67:
1.1 markus 68: /* protocol */
69:
1.15 markus 70: void input_service_request(int type, int plen, void *ctxt);
71: void input_userauth_request(int type, int plen, void *ctxt);
72: void protocol_error(int type, int plen, void *ctxt);
1.1 markus 73:
74: /* helper */
1.18 markus 75: Authmethod *authmethod_lookup(const char *name);
76: struct passwd *pwcopy(struct passwd *pw);
1.21 markus 77: int user_key_allowed(struct passwd *pw, Key *key);
1.18 markus 78: char *authmethods_get(void);
1.1 markus 79:
1.18 markus 80: /* auth */
1.25 markus 81: void userauth_banner(void);
1.18 markus 82: int userauth_none(Authctxt *authctxt);
83: int userauth_passwd(Authctxt *authctxt);
84: int userauth_pubkey(Authctxt *authctxt);
85: int userauth_kbdint(Authctxt *authctxt);
86:
87: Authmethod authmethods[] = {
88: {"none",
89: userauth_none,
90: &one},
91: {"publickey",
92: userauth_pubkey,
1.21 markus 93: &options.pubkey_authentication},
1.18 markus 94: {"keyboard-interactive",
95: userauth_kbdint,
96: &options.kbd_interactive_authentication},
97: {"password",
98: userauth_passwd,
99: &options.password_authentication},
100: {NULL, NULL, NULL}
1.1 markus 101: };
102:
103: /*
1.18 markus 104: * loop until authctxt->success == TRUE
1.1 markus 105: */
106:
107: void
108: do_authentication2()
109: {
1.28 ! markus 110: Authctxt *authctxt = authctxt_new();
! 111:
1.18 markus 112: x_authctxt = authctxt; /*XXX*/
113:
1.26 markus 114: #ifdef AFS
115: /* If machine has AFS, set process authentication group. */
116: if (k_hasafs()) {
117: k_setpag();
118: k_unlog();
119: }
1.5 djm 120: #endif
1.1 markus 121: dispatch_init(&protocol_error);
122: dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
1.18 markus 123: dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
1.28 ! markus 124: do_authenticated2(authctxt);
1.1 markus 125: }
126:
127: void
1.15 markus 128: protocol_error(int type, int plen, void *ctxt)
1.1 markus 129: {
130: log("auth: protocol error: type %d plen %d", type, plen);
131: packet_start(SSH2_MSG_UNIMPLEMENTED);
132: packet_put_int(0);
133: packet_send();
134: packet_write_wait();
135: }
136:
137: void
1.15 markus 138: input_service_request(int type, int plen, void *ctxt)
1.1 markus 139: {
1.18 markus 140: Authctxt *authctxt = ctxt;
1.23 markus 141: u_int len;
1.1 markus 142: int accept = 0;
143: char *service = packet_get_string(&len);
144: packet_done();
145:
1.18 markus 146: if (authctxt == NULL)
147: fatal("input_service_request: no authctxt");
148:
1.1 markus 149: if (strcmp(service, "ssh-userauth") == 0) {
1.18 markus 150: if (!authctxt->success) {
1.1 markus 151: accept = 1;
152: /* now we can handle user-auth requests */
153: dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
154: }
155: }
156: /* XXX all other service requests are denied */
157:
158: if (accept) {
159: packet_start(SSH2_MSG_SERVICE_ACCEPT);
160: packet_put_cstring(service);
161: packet_send();
162: packet_write_wait();
163: } else {
164: debug("bad service request %s", service);
165: packet_disconnect("bad service request %s", service);
166: }
167: xfree(service);
168: }
169:
170: void
1.15 markus 171: input_userauth_request(int type, int plen, void *ctxt)
1.1 markus 172: {
1.18 markus 173: Authctxt *authctxt = ctxt;
174: Authmethod *m = NULL;
1.28 ! markus 175: char *user, *service, *method, *style = NULL;
1.1 markus 176: int authenticated = 0;
177:
1.18 markus 178: if (authctxt == NULL)
179: fatal("input_userauth_request: no authctxt");
1.1 markus 180:
1.18 markus 181: user = packet_get_string(NULL);
182: service = packet_get_string(NULL);
183: method = packet_get_string(NULL);
1.1 markus 184: debug("userauth-request for user %s service %s method %s", user, service, method);
1.24 markus 185: debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
1.1 markus 186:
1.28 ! markus 187: if ((style = strchr(user, ':')) != NULL)
! 188: *style++ = 0;
! 189:
1.24 markus 190: if (authctxt->attempt++ == 0) {
1.18 markus 191: /* setup auth context */
192: struct passwd *pw = NULL;
193: setproctitle("%s", user);
194: pw = getpwnam(user);
195: if (pw && allowed_user(pw) && strcmp(service, "ssh-connection")==0) {
196: authctxt->pw = pwcopy(pw);
197: authctxt->valid = 1;
198: debug2("input_userauth_request: setting up authctxt for %s", user);
199: } else {
200: log("input_userauth_request: illegal user %s", user);
201: }
202: authctxt->user = xstrdup(user);
203: authctxt->service = xstrdup(service);
1.28 ! markus 204: authctxt->style = style ? xstrdup(style) : NULL; /* currently unused */
1.18 markus 205: } else if (authctxt->valid) {
206: if (strcmp(user, authctxt->user) != 0 ||
207: strcmp(service, authctxt->service) != 0) {
208: log("input_userauth_request: missmatch: (%s,%s)!=(%s,%s)",
209: user, service, authctxt->user, authctxt->service);
210: authctxt->valid = 0;
1.1 markus 211: }
212: }
1.28 ! markus 213: /* reset state */
! 214: dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, &protocol_error);
! 215: authctxt->postponed = 0;
1.18 markus 216:
1.28 ! markus 217: /* try to authenticate user */
1.18 markus 218: m = authmethod_lookup(method);
219: if (m != NULL) {
220: debug2("input_userauth_request: try method %s", method);
221: authenticated = m->userauth(authctxt);
222: }
1.28 ! markus 223: if (!authctxt->valid && authenticated)
! 224: fatal("INTERNAL ERROR: authenticated invalid user %s",
! 225: authctxt->user);
1.18 markus 226:
227: /* Special handling for root */
1.28 ! markus 228: if (authenticated && authctxt->pw->pw_uid == 0 && !auth_root_allowed())
1.3 markus 229: authenticated = 0;
230:
1.18 markus 231: /* Log before sending the reply */
1.28 ! markus 232: auth_log(authctxt, authenticated, method, " ssh2");
! 233:
! 234: if (!authctxt->postponed)
! 235: userauth_reply(authctxt, authenticated);
1.18 markus 236:
237: xfree(service);
238: xfree(user);
239: xfree(method);
240: }
241:
1.25 markus 242: void
243: userauth_banner(void)
244: {
245: struct stat st;
246: char *banner = NULL;
247: off_t len, n;
248: int fd;
249:
250: if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
251: return;
252: if ((fd = open(options.banner, O_RDONLY)) < 0) {
253: error("userauth_banner: open %s failed: %s",
254: options.banner, strerror(errno));
255: return;
256: }
257: if (fstat(fd, &st) < 0)
258: goto done;
259: len = st.st_size;
260: banner = xmalloc(len + 1);
261: if ((n = read(fd, banner, len)) < 0)
262: goto done;
263: banner[n] = '\0';
264: packet_start(SSH2_MSG_USERAUTH_BANNER);
265: packet_put_cstring(banner);
266: packet_put_cstring(""); /* language, unused */
267: packet_send();
268: debug("userauth_banner: sent");
269: done:
270: if (banner)
271: xfree(banner);
272: close(fd);
273: return;
274: }
1.18 markus 275:
276: void
277: userauth_reply(Authctxt *authctxt, int authenticated)
278: {
1.24 markus 279: char *methods;
1.28 ! markus 280:
1.3 markus 281: /* XXX todo: check if multiple auth methods are needed */
1.28 ! markus 282: if (authenticated) {
1.1 markus 283: /* turn off userauth */
284: dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &protocol_error);
285: packet_start(SSH2_MSG_USERAUTH_SUCCESS);
286: packet_send();
287: packet_write_wait();
288: /* now we can break out */
1.18 markus 289: authctxt->success = 1;
1.28 ! markus 290: } else {
! 291: if (authctxt->failures++ > AUTH_FAIL_MAX)
! 292: packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
1.24 markus 293: methods = authmethods_get();
1.1 markus 294: packet_start(SSH2_MSG_USERAUTH_FAILURE);
1.18 markus 295: packet_put_cstring(methods);
296: packet_put_char(0); /* XXX partial success, unused */
1.1 markus 297: packet_send();
298: packet_write_wait();
1.18 markus 299: xfree(methods);
1.1 markus 300: }
301: }
302:
303: int
1.18 markus 304: userauth_none(Authctxt *authctxt)
1.1 markus 305: {
1.18 markus 306: /* disable method "none", only allowed one time */
307: Authmethod *m = authmethod_lookup("none");
308: if (m != NULL)
309: m->enabled = NULL;
1.1 markus 310: packet_done();
1.25 markus 311: userauth_banner();
1.18 markus 312: return authctxt->valid ? auth_password(authctxt->pw, "") : 0;
1.1 markus 313: }
1.18 markus 314:
1.1 markus 315: int
1.18 markus 316: userauth_passwd(Authctxt *authctxt)
1.1 markus 317: {
318: char *password;
319: int authenticated = 0;
320: int change;
1.23 markus 321: u_int len;
1.1 markus 322: change = packet_get_char();
323: if (change)
324: log("password change not supported");
325: password = packet_get_string(&len);
326: packet_done();
1.18 markus 327: if (authctxt->valid &&
328: auth_password(authctxt->pw, password) == 1)
1.1 markus 329: authenticated = 1;
330: memset(password, 0, len);
331: xfree(password);
332: return authenticated;
333: }
1.18 markus 334:
335: int
336: userauth_kbdint(Authctxt *authctxt)
337: {
338: int authenticated = 0;
339: char *lang = NULL;
340: char *devs = NULL;
341:
342: lang = packet_get_string(NULL);
343: devs = packet_get_string(NULL);
344: packet_done();
345:
346: debug("keyboard-interactive language %s devs %s", lang, devs);
1.28 ! markus 347:
! 348: authenticated = auth2_challenge(authctxt, devs);
! 349:
1.18 markus 350: xfree(lang);
351: xfree(devs);
352: return authenticated;
353: }
354:
1.1 markus 355: int
1.18 markus 356: userauth_pubkey(Authctxt *authctxt)
1.1 markus 357: {
358: Buffer b;
359: Key *key;
360: char *pkalg, *pkblob, *sig;
1.23 markus 361: u_int alen, blen, slen;
1.21 markus 362: int have_sig, pktype;
1.1 markus 363: int authenticated = 0;
364:
1.18 markus 365: if (!authctxt->valid) {
366: debug2("userauth_pubkey: disabled because of invalid user");
1.8 markus 367: return 0;
368: }
1.1 markus 369: have_sig = packet_get_char();
1.22 markus 370: if (datafellows & SSH_BUG_PKAUTH) {
371: debug2("userauth_pubkey: SSH_BUG_PKAUTH");
372: /* no explicit pkalg given */
373: pkblob = packet_get_string(&blen);
374: buffer_init(&b);
375: buffer_append(&b, pkblob, blen);
376: /* so we have to extract the pkalg from the pkblob */
377: pkalg = buffer_get_string(&b, &alen);
378: buffer_free(&b);
379: } else {
380: pkalg = packet_get_string(&alen);
381: pkblob = packet_get_string(&blen);
382: }
1.21 markus 383: pktype = key_type_from_name(pkalg);
384: if (pktype == KEY_UNSPEC) {
1.22 markus 385: /* this is perfectly legal */
386: log("userauth_pubkey: unsupported public key algorithm: %s", pkalg);
1.1 markus 387: xfree(pkalg);
1.22 markus 388: xfree(pkblob);
1.1 markus 389: return 0;
390: }
1.21 markus 391: key = key_from_blob(pkblob, blen);
1.2 markus 392: if (key != NULL) {
393: if (have_sig) {
394: sig = packet_get_string(&slen);
395: packet_done();
396: buffer_init(&b);
1.20 markus 397: if (datafellows & SSH_OLD_SESSIONID) {
398: buffer_append(&b, session_id2, session_id2_len);
399: } else {
1.11 markus 400: buffer_put_string(&b, session_id2, session_id2_len);
401: }
1.9 markus 402: /* reconstruct packet */
1.2 markus 403: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.18 markus 404: buffer_put_cstring(&b, authctxt->user);
1.9 markus 405: buffer_put_cstring(&b,
1.22 markus 406: datafellows & SSH_BUG_PKSERVICE ?
1.9 markus 407: "ssh-userauth" :
1.18 markus 408: authctxt->service);
1.22 markus 409: if (datafellows & SSH_BUG_PKAUTH) {
410: buffer_put_char(&b, have_sig);
411: } else {
412: buffer_put_cstring(&b, "publickey");
413: buffer_put_char(&b, have_sig);
414: buffer_put_cstring(&b, key_ssh_name(key));
415: }
1.9 markus 416: buffer_put_string(&b, pkblob, blen);
1.21 markus 417: #ifdef DEBUG_PK
1.2 markus 418: buffer_dump(&b);
1.1 markus 419: #endif
1.2 markus 420: /* test for correct signature */
1.21 markus 421: if (user_key_allowed(authctxt->pw, key) &&
422: key_verify(key, sig, slen, buffer_ptr(&b), buffer_len(&b)) == 1)
1.2 markus 423: authenticated = 1;
424: buffer_clear(&b);
425: xfree(sig);
426: } else {
1.18 markus 427: debug("test whether pkalg/pkblob are acceptable");
1.2 markus 428: packet_done();
1.18 markus 429:
1.2 markus 430: /* XXX fake reply and always send PK_OK ? */
1.6 markus 431: /*
432: * XXX this allows testing whether a user is allowed
433: * to login: if you happen to have a valid pubkey this
434: * message is sent. the message is NEVER sent at all
435: * if a user is not allowed to login. is this an
436: * issue? -markus
437: */
1.21 markus 438: if (user_key_allowed(authctxt->pw, key)) {
1.2 markus 439: packet_start(SSH2_MSG_USERAUTH_PK_OK);
440: packet_put_string(pkalg, alen);
441: packet_put_string(pkblob, blen);
442: packet_send();
443: packet_write_wait();
444: authenticated = -1;
445: }
1.1 markus 446: }
1.17 markus 447: if (authenticated != 1)
448: auth_clear_options();
1.2 markus 449: key_free(key);
1.1 markus 450: }
1.21 markus 451: debug2("userauth_pubkey: authenticated %d pkalg %s", authenticated, pkalg);
1.1 markus 452: xfree(pkalg);
453: xfree(pkblob);
454: return authenticated;
455: }
456:
1.18 markus 457: /* get current user */
1.1 markus 458:
459: struct passwd*
460: auth_get_user(void)
461: {
1.18 markus 462: return (x_authctxt != NULL && x_authctxt->valid) ? x_authctxt->pw : NULL;
1.1 markus 463: }
464:
1.18 markus 465: #define DELIM ","
466:
467: char *
468: authmethods_get(void)
1.1 markus 469: {
1.18 markus 470: Authmethod *method = NULL;
1.23 markus 471: u_int size = 0;
1.18 markus 472: char *list;
1.1 markus 473:
1.18 markus 474: for (method = authmethods; method->name != NULL; method++) {
475: if (strcmp(method->name, "none") == 0)
476: continue;
477: if (method->enabled != NULL && *(method->enabled) != 0) {
478: if (size != 0)
479: size += strlen(DELIM);
480: size += strlen(method->name);
1.1 markus 481: }
1.18 markus 482: }
483: size++; /* trailing '\0' */
484: list = xmalloc(size);
485: list[0] = '\0';
486:
487: for (method = authmethods; method->name != NULL; method++) {
488: if (strcmp(method->name, "none") == 0)
489: continue;
490: if (method->enabled != NULL && *(method->enabled) != 0) {
491: if (list[0] != '\0')
492: strlcat(list, DELIM, size);
493: strlcat(list, method->name, size);
1.1 markus 494: }
495: }
1.18 markus 496: return list;
497: }
498:
499: Authmethod *
500: authmethod_lookup(const char *name)
501: {
502: Authmethod *method = NULL;
503: if (name != NULL)
504: for (method = authmethods; method->name != NULL; method++)
505: if (method->enabled != NULL &&
506: *(method->enabled) != 0 &&
507: strcmp(name, method->name) == 0)
508: return method;
509: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
510: return NULL;
1.1 markus 511: }
512:
513: /* return 1 if user allows given key */
514: int
1.21 markus 515: user_key_allowed(struct passwd *pw, Key *key)
1.1 markus 516: {
517: char line[8192], file[1024];
518: int found_key = 0;
519: FILE *f;
1.23 markus 520: u_long linenum = 0;
1.1 markus 521: struct stat st;
522: Key *found;
523:
1.18 markus 524: if (pw == NULL)
525: return 0;
526:
1.1 markus 527: /* Temporarily use the user's uid. */
528: temporarily_use_uid(pw->pw_uid);
529:
530: /* The authorized keys. */
531: snprintf(file, sizeof file, "%.500s/%.100s", pw->pw_dir,
532: SSH_USER_PERMITTED_KEYS2);
533:
534: /* Fail quietly if file does not exist */
535: if (stat(file, &st) < 0) {
536: /* Restore the privileged uid. */
537: restore_uid();
538: return 0;
539: }
540: /* Open the file containing the authorized keys. */
541: f = fopen(file, "r");
542: if (!f) {
543: /* Restore the privileged uid. */
544: restore_uid();
545: return 0;
546: }
547: if (options.strict_modes) {
548: int fail = 0;
549: char buf[1024];
550: /* Check open file in order to avoid open/stat races */
551: if (fstat(fileno(f), &st) < 0 ||
552: (st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
553: (st.st_mode & 022) != 0) {
1.16 markus 554: snprintf(buf, sizeof buf,
555: "%s authentication refused for %.100s: "
556: "bad ownership or modes for '%s'.",
557: key_type(key), pw->pw_name, file);
1.1 markus 558: fail = 1;
559: } else {
560: /* Check path to SSH_USER_PERMITTED_KEYS */
561: int i;
562: static const char *check[] = {
563: "", SSH_USER_DIR, NULL
564: };
565: for (i = 0; check[i]; i++) {
566: snprintf(line, sizeof line, "%.500s/%.100s",
567: pw->pw_dir, check[i]);
568: if (stat(line, &st) < 0 ||
569: (st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
570: (st.st_mode & 022) != 0) {
571: snprintf(buf, sizeof buf,
1.16 markus 572: "%s authentication refused for %.100s: "
1.1 markus 573: "bad ownership or modes for '%s'.",
1.16 markus 574: key_type(key), pw->pw_name, line);
1.1 markus 575: fail = 1;
576: break;
577: }
578: }
579: }
580: if (fail) {
581: fclose(f);
1.12 todd 582: log("%s",buf);
1.1 markus 583: restore_uid();
584: return 0;
585: }
586: }
587: found_key = 0;
1.16 markus 588: found = key_new(key->type);
1.1 markus 589:
590: while (fgets(line, sizeof(line), f)) {
1.10 markus 591: char *cp, *options = NULL;
1.1 markus 592: linenum++;
593: /* Skip leading whitespace, empty and comment lines. */
594: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
595: ;
596: if (!*cp || *cp == '\n' || *cp == '#')
597: continue;
1.10 markus 598:
1.21 markus 599: if (key_read(found, &cp) == -1) {
1.10 markus 600: /* no key? check if there are options for this key */
601: int quoted = 0;
1.21 markus 602: debug2("user_key_allowed: check options: '%s'", cp);
1.10 markus 603: options = cp;
604: for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) {
605: if (*cp == '\\' && cp[1] == '"')
606: cp++; /* Skip both */
607: else if (*cp == '"')
608: quoted = !quoted;
609: }
610: /* Skip remaining whitespace. */
611: for (; *cp == ' ' || *cp == '\t'; cp++)
612: ;
1.21 markus 613: if (key_read(found, &cp) == -1) {
614: debug2("user_key_allowed: advance: '%s'", cp);
1.10 markus 615: /* still no key? advance to next line*/
616: continue;
617: }
618: }
619: if (key_equal(found, key) &&
620: auth_parse_options(pw, options, linenum) == 1) {
1.1 markus 621: found_key = 1;
622: debug("matching key found: file %s, line %ld",
623: file, linenum);
624: break;
625: }
626: }
627: restore_uid();
628: fclose(f);
629: key_free(found);
630: return found_key;
631: }
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