Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.120
1.120 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.119 2020/10/16 13:24:45 djm Exp $ */
1.1 provos 2: /*
3: * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4: * Copyright 2002 Markus Friedl <markus@openbsd.org>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
1.46 stevesk 28: #include <sys/types.h>
1.51 dtucker 29: #include <sys/uio.h>
1.61 djm 30: #include <sys/queue.h>
1.46 stevesk 31:
1.47 stevesk 32: #include <errno.h>
1.46 stevesk 33: #include <pwd.h>
1.50 deraadt 34: #include <signal.h>
1.49 stevesk 35: #include <stdio.h>
1.48 stevesk 36: #include <string.h>
1.115 naddy 37: #include <stdarg.h>
1.51 dtucker 38: #include <unistd.h>
1.68 dtucker 39:
1.80 markus 40: #ifdef WITH_OPENSSL
1.68 dtucker 41: #include <openssl/bn.h>
42: #include <openssl/dh.h>
1.80 markus 43: #endif
1.1 provos 44:
1.50 deraadt 45: #include "xmalloc.h"
1.1 provos 46: #include "ssh.h"
1.80 markus 47: #ifdef WITH_OPENSSL
1.1 provos 48: #include "dh.h"
1.80 markus 49: #endif
1.103 markus 50: #include "sshbuf.h"
1.106 markus 51: #include "sshkey.h"
1.50 deraadt 52: #include "cipher.h"
1.1 provos 53: #include "kex.h"
1.50 deraadt 54: #include "hostfile.h"
1.1 provos 55: #include "auth.h"
1.22 markus 56: #include "auth-options.h"
1.1 provos 57: #include "packet.h"
58: #include "mac.h"
59: #include "log.h"
60: #include "monitor.h"
1.50 deraadt 61: #ifdef GSSAPI
62: #include "ssh-gss.h"
63: #endif
1.1 provos 64: #include "monitor_wrap.h"
65: #include "atomicio.h"
66: #include "monitor_fdpass.h"
1.45 djm 67: #include "misc.h"
1.1 provos 68:
69: #include "channels.h"
70: #include "session.h"
1.55 dtucker 71: #include "servconf.h"
1.29 markus 72:
1.82 markus 73: #include "ssherr.h"
1.108 djm 74:
1.1 provos 75: /* Imports */
1.7 mouring 76: extern struct monitor *pmonitor;
1.102 markus 77: extern struct sshbuf *loginmsg;
1.55 dtucker 78: extern ServerOptions options;
1.73 djm 79:
80: void
1.119 djm 81: mm_log_handler(const char *file, const char *func, int line,
82: LogLevel level, const char *msg, void *ctx)
1.73 djm 83: {
1.103 markus 84: struct sshbuf *log_msg;
1.73 djm 85: struct monitor *mon = (struct monitor *)ctx;
1.103 markus 86: int r;
87: size_t len;
1.73 djm 88:
89: if (mon->m_log_sendfd == -1)
90: fatal("%s: no log channel", __func__);
91:
1.103 markus 92: if ((log_msg = sshbuf_new()) == NULL)
93: fatal("%s: sshbuf_new failed", __func__);
1.73 djm 94:
1.103 markus 95: if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */
1.119 djm 96: (r = sshbuf_put_cstring(log_msg, file)) != 0 ||
97: (r = sshbuf_put_cstring(log_msg, func)) != 0 ||
98: (r = sshbuf_put_u32(log_msg, (u_int)line)) != 0 ||
1.103 markus 99: (r = sshbuf_put_u32(log_msg, level)) != 0 ||
100: (r = sshbuf_put_cstring(log_msg, msg)) != 0)
101: fatal("%s: buffer error: %s", __func__, ssh_err(r));
102: if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
103: fatal("%s: bad length %zu", __func__, len);
104: POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4);
105: if (atomicio(vwrite, mon->m_log_sendfd,
106: sshbuf_mutable_ptr(log_msg), len) != len)
1.73 djm 107: fatal("%s: write: %s", __func__, strerror(errno));
1.103 markus 108: sshbuf_free(log_msg);
1.73 djm 109: }
1.1 provos 110:
1.32 markus 111: int
112: mm_is_monitor(void)
113: {
114: /*
115: * m_pid is only set in the privileged part, and
116: * points to the unprivileged child.
117: */
1.34 markus 118: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 119: }
120:
1.1 provos 121: void
1.103 markus 122: mm_request_send(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 123: {
1.103 markus 124: size_t mlen = sshbuf_len(m);
1.1 provos 125: u_char buf[5];
126:
1.8 markus 127: debug3("%s entering: type %d", __func__, type);
1.1 provos 128:
1.103 markus 129: if (mlen >= 0xffffffff)
130: fatal("%s: bad length %zu", __func__, mlen);
131: POKE_U32(buf, mlen + 1);
1.10 deraadt 132: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 133: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 134: fatal("%s: write: %s", __func__, strerror(errno));
1.103 markus 135: if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen)
1.40 avsm 136: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 137: }
138:
139: void
1.103 markus 140: mm_request_receive(int sock, struct sshbuf *m)
1.1 provos 141: {
1.103 markus 142: u_char buf[4], *p = NULL;
1.13 deraadt 143: u_int msg_len;
1.103 markus 144: int r;
1.1 provos 145:
1.8 markus 146: debug3("%s entering", __func__);
1.1 provos 147:
1.40 avsm 148: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
149: if (errno == EPIPE)
1.32 markus 150: cleanup_exit(255);
1.40 avsm 151: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 152: }
1.103 markus 153: msg_len = PEEK_U32(buf);
1.1 provos 154: if (msg_len > 256 * 1024)
1.8 markus 155: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.103 markus 156: sshbuf_reset(m);
157: if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
158: fatal("%s: buffer error: %s", __func__, ssh_err(r));
159: if (atomicio(read, sock, p, msg_len) != msg_len)
1.40 avsm 160: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 161: }
162:
163: void
1.103 markus 164: mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 165: {
166: u_char rtype;
1.103 markus 167: int r;
1.1 provos 168:
1.8 markus 169: debug3("%s entering: type %d", __func__, type);
1.1 provos 170:
1.36 avsm 171: mm_request_receive(sock, m);
1.103 markus 172: if ((r = sshbuf_get_u8(m, &rtype)) != 0)
173: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 174: if (rtype != type)
1.8 markus 175: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 176: rtype, type);
177: }
178:
1.80 markus 179: #ifdef WITH_OPENSSL
1.1 provos 180: DH *
181: mm_choose_dh(int min, int nbits, int max)
182: {
183: BIGNUM *p, *g;
1.103 markus 184: int r;
185: u_char success = 0;
186: struct sshbuf *m;
1.1 provos 187:
1.103 markus 188: if ((m = sshbuf_new()) == NULL)
189: fatal("%s: sshbuf_new failed", __func__);
190: if ((r = sshbuf_put_u32(m, min)) != 0 ||
191: (r = sshbuf_put_u32(m, nbits)) != 0 ||
192: (r = sshbuf_put_u32(m, max)) != 0)
193: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 194:
1.103 markus 195: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
1.1 provos 196:
1.8 markus 197: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.103 markus 198: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m);
1.1 provos 199:
1.103 markus 200: if ((r = sshbuf_get_u8(m, &success)) != 0)
201: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 202: if (success == 0)
1.8 markus 203: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 204:
1.112 djm 205: if ((r = sshbuf_get_bignum2(m, &p)) != 0 ||
206: (r = sshbuf_get_bignum2(m, &g)) != 0)
1.103 markus 207: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 208:
1.103 markus 209: debug3("%s: remaining %zu", __func__, sshbuf_len(m));
210: sshbuf_free(m);
1.1 provos 211:
212: return (dh_new_group(g, p));
213: }
1.80 markus 214: #endif
1.1 provos 215:
216: int
1.111 djm 217: mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.114 djm 218: const u_char *data, size_t datalen, const char *hostkey_alg,
1.118 djm 219: const char *sk_provider, const char *sk_pin, u_int compat)
1.1 provos 220: {
1.83 markus 221: struct kex *kex = *pmonitor->m_pkex;
1.103 markus 222: struct sshbuf *m;
1.111 djm 223: u_int ndx = kex->host_key_index(key, 0, ssh);
1.103 markus 224: int r;
1.1 provos 225:
1.8 markus 226: debug3("%s entering", __func__);
1.103 markus 227: if ((m = sshbuf_new()) == NULL)
228: fatal("%s: sshbuf_new failed", __func__);
229: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
230: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
1.106 markus 231: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
232: (r = sshbuf_put_u32(m, compat)) != 0)
1.103 markus 233: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 234:
1.103 markus 235: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 236:
1.8 markus 237: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.103 markus 238: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
1.106 markus 239: if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
1.103 markus 240: fatal("%s: buffer error: %s", __func__, ssh_err(r));
241: sshbuf_free(m);
1.1 provos 242:
243: return (0);
244: }
245:
246: struct passwd *
1.109 djm 247: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 248: {
1.103 markus 249: struct sshbuf *m;
1.1 provos 250: struct passwd *pw;
1.103 markus 251: size_t len;
252: u_int i;
1.55 dtucker 253: ServerOptions *newopts;
1.103 markus 254: int r;
255: u_char ok;
256: const u_char *p;
1.1 provos 257:
1.8 markus 258: debug3("%s entering", __func__);
1.1 provos 259:
1.103 markus 260: if ((m = sshbuf_new()) == NULL)
261: fatal("%s: sshbuf_new failed", __func__);
262: if ((r = sshbuf_put_cstring(m, username)) != 0)
263: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 264:
1.103 markus 265: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 266:
1.8 markus 267: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 268: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 269:
1.103 markus 270: if ((r = sshbuf_get_u8(m, &ok)) != 0)
271: fatal("%s: buffer error: %s", __func__, ssh_err(r));
272: if (ok == 0) {
1.60 dtucker 273: pw = NULL;
274: goto out;
1.1 provos 275: }
1.103 markus 276:
277: /* XXX don't like passing struct passwd like this */
278: pw = xcalloc(sizeof(*pw), 1);
279: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
280: fatal("%s: buffer error: %s", __func__, ssh_err(r));
281: if (len != sizeof(*pw))
1.8 markus 282: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 283: memcpy(pw, p, sizeof(*pw));
284:
285: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
286: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
287: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
288: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
289: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
290: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
291: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 292:
1.60 dtucker 293: out:
1.55 dtucker 294: /* copy options block as a Match directive may have changed some */
1.103 markus 295: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
296: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 297: if (len != sizeof(*newopts))
298: fatal("%s: option block size mismatch", __func__);
1.103 markus 299: newopts = xcalloc(sizeof(*newopts), 1);
300: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 301:
302: #define M_CP_STROPT(x) do { \
1.103 markus 303: if (newopts->x != NULL) { \
304: if ((r = sshbuf_get_cstring(m, \
305: &newopts->x, NULL)) != 0) \
306: fatal("%s: buffer error: %s", \
307: __func__, ssh_err(r)); \
308: } \
1.71 djm 309: } while (0)
1.72 djm 310: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 311: newopts->x = newopts->nx == 0 ? \
312: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 313: for (i = 0; i < newopts->nx; i++) { \
314: if ((r = sshbuf_get_cstring(m, \
315: &newopts->x[i], NULL)) != 0) \
316: fatal("%s: buffer error: %s", \
317: __func__, ssh_err(r)); \
318: } \
1.72 djm 319: } while (0)
1.71 djm 320: /* See comment in servconf.h */
321: COPY_MATCH_STRING_OPTS();
322: #undef M_CP_STROPT
1.72 djm 323: #undef M_CP_STRARRAYOPT
1.71 djm 324:
1.55 dtucker 325: copy_set_server_options(&options, newopts, 1);
1.90 djm 326: log_change_level(options.log_level);
1.120 ! djm 327: log_verbose_reset();
! 328: for (i = 0; i < options.num_log_verbose; i++)
! 329: log_verbose_add(options.log_verbose[i]);
1.93 djm 330: process_permitopen(ssh, &options);
1.76 djm 331: free(newopts);
1.55 dtucker 332:
1.103 markus 333: sshbuf_free(m);
1.1 provos 334:
335: return (pw);
1.6 djm 336: }
337:
1.33 markus 338: char *
339: mm_auth2_read_banner(void)
1.6 djm 340: {
1.103 markus 341: struct sshbuf *m;
1.6 djm 342: char *banner;
1.103 markus 343: int r;
1.6 djm 344:
1.8 markus 345: debug3("%s entering", __func__);
1.6 djm 346:
1.103 markus 347: if ((m = sshbuf_new()) == NULL)
348: fatal("%s: sshbuf_new failed", __func__);
349: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
350: sshbuf_reset(m);
1.6 djm 351:
1.33 markus 352: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 353: MONITOR_ANS_AUTH2_READ_BANNER, m);
354: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
355: fatal("%s: buffer error: %s", __func__, ssh_err(r));
356: sshbuf_free(m);
1.10 deraadt 357:
1.33 markus 358: /* treat empty banner as missing banner */
359: if (strlen(banner) == 0) {
1.76 djm 360: free(banner);
1.33 markus 361: banner = NULL;
362: }
1.6 djm 363: return (banner);
1.1 provos 364: }
365:
366: /* Inform the privileged process about service and style */
367:
368: void
369: mm_inform_authserv(char *service, char *style)
370: {
1.103 markus 371: struct sshbuf *m;
372: int r;
1.1 provos 373:
1.8 markus 374: debug3("%s entering", __func__);
1.1 provos 375:
1.103 markus 376: if ((m = sshbuf_new()) == NULL)
377: fatal("%s: sshbuf_new failed", __func__);
378: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
379: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
380: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 381:
1.103 markus 382: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 383:
1.103 markus 384: sshbuf_free(m);
1.1 provos 385: }
386:
387: /* Do the password authentication */
388: int
1.99 djm 389: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 390: {
1.103 markus 391: struct sshbuf *m;
392: int r, authenticated = 0;
1.1 provos 393:
1.8 markus 394: debug3("%s entering", __func__);
1.1 provos 395:
1.103 markus 396: if ((m = sshbuf_new()) == NULL)
397: fatal("%s: sshbuf_new failed", __func__);
398: if ((r = sshbuf_put_cstring(m, password)) != 0)
399: fatal("%s: buffer error: %s", __func__, ssh_err(r));
400: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 401:
1.8 markus 402: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 403: mm_request_receive_expect(pmonitor->m_recvfd,
404: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 405:
1.103 markus 406: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
407: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 408:
1.103 markus 409: sshbuf_free(m);
1.1 provos 410:
1.3 markus 411: debug3("%s: user %sauthenticated",
1.8 markus 412: __func__, authenticated ? "" : "not ");
1.1 provos 413: return (authenticated);
414: }
415:
416: int
1.99 djm 417: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
418: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 419: {
1.85 djm 420: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 421: pubkey_auth_attempt, authoptp));
1.1 provos 422: }
423:
424: int
1.111 djm 425: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
426: const char *user, const char *host, struct sshkey *key)
1.1 provos 427: {
1.99 djm 428: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 429: }
430:
431: int
1.88 djm 432: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 433: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 434: {
1.103 markus 435: struct sshbuf *m;
1.99 djm 436: int r, allowed = 0;
437: struct sshauthopt *opts = NULL;
1.1 provos 438:
1.8 markus 439: debug3("%s entering", __func__);
1.1 provos 440:
1.99 djm 441: if (authoptp != NULL)
442: *authoptp = NULL;
443:
1.103 markus 444: if ((m = sshbuf_new()) == NULL)
445: fatal("%s: sshbuf_new failed", __func__);
446: if ((r = sshbuf_put_u32(m, type)) != 0 ||
447: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
448: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
449: (r = sshkey_puts(key, m)) != 0 ||
450: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
451: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 452:
1.103 markus 453: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 454:
1.8 markus 455: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 456: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 457: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 458:
1.103 markus 459: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
460: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 461: if (allowed && type == MM_USERKEY) {
1.103 markus 462: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 463: fatal("%s: sshauthopt_deserialise: %s",
464: __func__, ssh_err(r));
465: }
1.103 markus 466: sshbuf_free(m);
1.1 provos 467:
1.99 djm 468: if (authoptp != NULL) {
469: *authoptp = opts;
470: opts = NULL;
471: }
472: sshauthopt_free(opts);
1.1 provos 473:
1.99 djm 474: return allowed;
1.1 provos 475: }
476:
1.3 markus 477: /*
1.1 provos 478: * This key verify needs to send the key type along, because the
479: * privileged parent makes the decision if the key is allowed
480: * for authentication.
481: */
482:
483: int
1.92 markus 484: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.116 djm 485: const u_char *data, size_t datalen, const char *sigalg, u_int compat,
486: struct sshkey_sig_details **sig_detailsp)
1.1 provos 487: {
1.103 markus 488: struct sshbuf *m;
1.92 markus 489: u_int encoded_ret = 0;
1.103 markus 490: int r;
1.116 djm 491: u_char sig_details_present, flags;
492: u_int counter;
1.1 provos 493:
1.8 markus 494: debug3("%s entering", __func__);
1.1 provos 495:
1.116 djm 496: if (sig_detailsp != NULL)
497: *sig_detailsp = NULL;
1.103 markus 498: if ((m = sshbuf_new()) == NULL)
499: fatal("%s: sshbuf_new failed", __func__);
500: if ((r = sshkey_puts(key, m)) != 0 ||
501: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
502: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
503: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
504: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 505:
1.103 markus 506: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 507:
1.8 markus 508: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 509: mm_request_receive_expect(pmonitor->m_recvfd,
510: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 511:
1.116 djm 512: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
513: (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
1.103 markus 514: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.116 djm 515: if (sig_details_present && encoded_ret == 0) {
516: if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
517: (r = sshbuf_get_u8(m, &flags)) != 0)
518: fatal("%s: buffer error: %s", __func__, ssh_err(r));
519: if (sig_detailsp != NULL) {
520: *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
521: (*sig_detailsp)->sk_counter = counter;
522: (*sig_detailsp)->sk_flags = flags;
523: }
524: }
1.1 provos 525:
1.103 markus 526: sshbuf_free(m);
1.1 provos 527:
1.92 markus 528: if (encoded_ret != 0)
529: return SSH_ERR_SIGNATURE_INVALID;
530: return 0;
1.1 provos 531: }
532:
533: void
1.111 djm 534: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 535: {
1.82 markus 536: struct sshbuf *m;
537: int r;
538:
539: if ((m = sshbuf_new()) == NULL)
540: fatal("%s: sshbuf_new failed", __func__);
541: if ((r = ssh_packet_get_state(ssh, m)) != 0)
542: fatal("%s: get_state failed: %s",
543: __func__, ssh_err(r));
544: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 545: debug3("%s: Finished sending state", __func__);
1.82 markus 546: sshbuf_free(m);
1.1 provos 547: }
548:
549: int
1.42 deraadt 550: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 551: {
1.103 markus 552: struct sshbuf *m;
1.39 dtucker 553: char *p, *msg;
1.102 markus 554: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 555:
556: /* Kludge: ensure there are fds free to receive the pty/tty */
557: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
558: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
559: error("%s: cannot allocate fds for pty", __func__);
560: if (tmp1 > 0)
561: close(tmp1);
562: if (tmp2 > 0)
563: close(tmp2);
564: return 0;
565: }
566: close(tmp1);
567: close(tmp2);
1.1 provos 568:
1.103 markus 569: if ((m = sshbuf_new()) == NULL)
570: fatal("%s: sshbuf_new failed", __func__);
571: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 572:
1.8 markus 573: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 574: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 575:
1.103 markus 576: if ((r = sshbuf_get_u32(m, &success)) != 0)
577: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 578: if (success == 0) {
1.8 markus 579: debug3("%s: pty alloc failed", __func__);
1.103 markus 580: sshbuf_free(m);
1.1 provos 581: return (0);
582: }
1.103 markus 583: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
584: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
585: fatal("%s: buffer error: %s", __func__, ssh_err(r));
586: sshbuf_free(m);
1.1 provos 587:
588: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 589: free(p);
1.39 dtucker 590:
1.102 markus 591: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
592: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 593: free(msg);
1.1 provos 594:
1.58 djm 595: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
596: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
597: fatal("%s: receive fds failed", __func__);
1.1 provos 598:
599: /* Success */
600: return (1);
601: }
602:
603: void
1.32 markus 604: mm_session_pty_cleanup2(Session *s)
1.1 provos 605: {
1.103 markus 606: struct sshbuf *m;
607: int r;
1.1 provos 608:
609: if (s->ttyfd == -1)
610: return;
1.103 markus 611: if ((m = sshbuf_new()) == NULL)
612: fatal("%s: sshbuf_new failed", __func__);
613: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
614: fatal("%s: buffer error: %s", __func__, ssh_err(r));
615: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
616: sshbuf_free(m);
1.3 markus 617:
1.1 provos 618: /* closed dup'ed master */
1.113 deraadt 619: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.62 djm 620: error("close(s->ptymaster/%d): %s",
621: s->ptymaster, strerror(errno));
1.1 provos 622:
623: /* unlink pty from session */
624: s->ttyfd = -1;
625: }
626:
627: /* Request process termination */
628:
629: void
630: mm_terminate(void)
631: {
1.103 markus 632: struct sshbuf *m;
1.1 provos 633:
1.103 markus 634: if ((m = sshbuf_new()) == NULL)
635: fatal("%s: sshbuf_new failed", __func__);
636: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
637: sshbuf_free(m);
1.1 provos 638: }
639:
1.2 markus 640: static void
1.1 provos 641: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
642: char ***prompts, u_int **echo_on)
643: {
1.10 deraadt 644: *name = xstrdup("");
645: *infotxt = xstrdup("");
1.1 provos 646: *numprompts = 1;
1.43 djm 647: *prompts = xcalloc(*numprompts, sizeof(char *));
648: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 649: (*echo_on)[0] = 0;
650: }
651:
652: int
653: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
654: u_int *numprompts, char ***prompts, u_int **echo_on)
655: {
1.103 markus 656: struct sshbuf *m;
1.21 markus 657: u_int success;
1.1 provos 658: char *challenge;
1.103 markus 659: int r;
1.1 provos 660:
1.8 markus 661: debug3("%s: entering", __func__);
1.1 provos 662:
1.103 markus 663: if ((m = sshbuf_new()) == NULL)
664: fatal("%s: sshbuf_new failed", __func__);
665: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 666:
1.103 markus 667: mm_request_receive_expect(pmonitor->m_recvfd,
668: MONITOR_ANS_BSDAUTHQUERY, m);
669: if ((r = sshbuf_get_u32(m, &success)) != 0)
670: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 671: if (success == 0) {
1.8 markus 672: debug3("%s: no challenge", __func__);
1.103 markus 673: sshbuf_free(m);
1.1 provos 674: return (-1);
675: }
676:
677: /* Get the challenge, and format the response */
1.103 markus 678: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
679: fatal("%s: buffer error: %s", __func__, ssh_err(r));
680: sshbuf_free(m);
1.1 provos 681:
682: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
683: (*prompts)[0] = challenge;
684:
1.8 markus 685: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 686:
687: return (0);
688: }
689:
690: int
691: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
692: {
1.103 markus 693: struct sshbuf *m;
694: int r, authok;
1.1 provos 695:
1.8 markus 696: debug3("%s: entering", __func__);
1.1 provos 697: if (numresponses != 1)
698: return (-1);
699:
1.103 markus 700: if ((m = sshbuf_new()) == NULL)
701: fatal("%s: sshbuf_new failed", __func__);
702: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
703: fatal("%s: buffer error: %s", __func__, ssh_err(r));
704: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 705:
1.7 mouring 706: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 707: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 708:
1.103 markus 709: if ((r = sshbuf_get_u32(m, &authok)) != 0)
710: fatal("%s: buffer error: %s", __func__, ssh_err(r));
711: sshbuf_free(m);
1.1 provos 712:
713: return ((authok == 0) ? -1 : 0);
714: }
1.29 markus 715:
716: #ifdef GSSAPI
717: OM_uint32
1.36 avsm 718: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 719: {
1.103 markus 720: struct sshbuf *m;
1.29 markus 721: OM_uint32 major;
1.103 markus 722: int r;
1.29 markus 723:
724: /* Client doesn't get to see the context */
725: *ctx = NULL;
726:
1.103 markus 727: if ((m = sshbuf_new()) == NULL)
728: fatal("%s: sshbuf_new failed", __func__);
729: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
730: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 731:
1.103 markus 732: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
733: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 734:
1.103 markus 735: if ((r = sshbuf_get_u32(m, &major)) != 0)
736: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 737:
1.103 markus 738: sshbuf_free(m);
1.29 markus 739: return (major);
740: }
741:
742: OM_uint32
743: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 744: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 745: {
1.103 markus 746: struct sshbuf *m;
1.29 markus 747: OM_uint32 major;
1.103 markus 748: u_int flags;
749: int r;
1.29 markus 750:
1.103 markus 751: if ((m = sshbuf_new()) == NULL)
752: fatal("%s: sshbuf_new failed", __func__);
753: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
754: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 755:
1.103 markus 756: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
757: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 758:
1.103 markus 759: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 760: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 761: fatal("%s: buffer error: %s", __func__, ssh_err(r));
762: if (flagsp != NULL) {
763: if ((r = sshbuf_get_u32(m, &flags)) != 0)
764: fatal("%s: buffer error: %s", __func__, ssh_err(r));
765: *flagsp = flags;
766: }
1.29 markus 767:
1.103 markus 768: sshbuf_free(m);
1.29 markus 769:
770: return (major);
1.35 markus 771: }
772:
773: OM_uint32
774: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
775: {
1.103 markus 776: struct sshbuf *m;
1.35 markus 777: OM_uint32 major;
1.103 markus 778: int r;
779:
780: if ((m = sshbuf_new()) == NULL)
781: fatal("%s: sshbuf_new failed", __func__);
782: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
783: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
784: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 785:
1.103 markus 786: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
787: mm_request_receive_expect(pmonitor->m_recvfd,
788: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 789:
1.103 markus 790: if ((r = sshbuf_get_u32(m, &major)) != 0)
791: fatal("%s: buffer error: %s", __func__, ssh_err(r));
792: sshbuf_free(m);
1.35 markus 793: return(major);
1.29 markus 794: }
795:
796: int
797: mm_ssh_gssapi_userok(char *user)
798: {
1.103 markus 799: struct sshbuf *m;
800: int r, authenticated = 0;
1.29 markus 801:
1.103 markus 802: if ((m = sshbuf_new()) == NULL)
803: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 804:
1.103 markus 805: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
806: mm_request_receive_expect(pmonitor->m_recvfd,
807: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 808:
1.103 markus 809: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
810: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 811:
1.103 markus 812: sshbuf_free(m);
1.29 markus 813: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
814: return (authenticated);
815: }
816: #endif /* GSSAPI */
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