Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.105
1.105 ! sf 1: /* $OpenBSD: monitor_wrap.c,v 1.104 2018/07/10 09:13:30 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>
1.51 dtucker 37: #include <unistd.h>
1.68 dtucker 38:
1.80 markus 39: #ifdef WITH_OPENSSL
1.68 dtucker 40: #include <openssl/bn.h>
41: #include <openssl/dh.h>
1.80 markus 42: #endif
1.1 provos 43:
1.50 deraadt 44: #include "xmalloc.h"
1.1 provos 45: #include "ssh.h"
1.80 markus 46: #ifdef WITH_OPENSSL
1.1 provos 47: #include "dh.h"
1.80 markus 48: #endif
1.103 markus 49: #include "sshbuf.h"
1.50 deraadt 50: #include "key.h"
51: #include "cipher.h"
1.1 provos 52: #include "kex.h"
1.50 deraadt 53: #include "hostfile.h"
1.1 provos 54: #include "auth.h"
1.22 markus 55: #include "auth-options.h"
1.1 provos 56: #include "packet.h"
57: #include "mac.h"
58: #include "log.h"
1.54 miod 59: #include <zlib.h>
1.1 provos 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"
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
81: mm_log_handler(LogLevel level, const char *msg, void *ctx)
82: {
1.103 markus 83: struct sshbuf *log_msg;
1.73 djm 84: struct monitor *mon = (struct monitor *)ctx;
1.103 markus 85: int r;
86: size_t len;
1.73 djm 87:
88: if (mon->m_log_sendfd == -1)
89: fatal("%s: no log channel", __func__);
90:
1.103 markus 91: if ((log_msg = sshbuf_new()) == NULL)
92: fatal("%s: sshbuf_new failed", __func__);
1.73 djm 93:
1.103 markus 94: if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */
95: (r = sshbuf_put_u32(log_msg, level)) != 0 ||
96: (r = sshbuf_put_cstring(log_msg, msg)) != 0)
97: fatal("%s: buffer error: %s", __func__, ssh_err(r));
98: if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
99: fatal("%s: bad length %zu", __func__, len);
100: POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4);
101: if (atomicio(vwrite, mon->m_log_sendfd,
102: sshbuf_mutable_ptr(log_msg), len) != len)
1.73 djm 103: fatal("%s: write: %s", __func__, strerror(errno));
1.103 markus 104: sshbuf_free(log_msg);
1.73 djm 105: }
1.1 provos 106:
1.32 markus 107: int
108: mm_is_monitor(void)
109: {
110: /*
111: * m_pid is only set in the privileged part, and
112: * points to the unprivileged child.
113: */
1.34 markus 114: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 115: }
116:
1.1 provos 117: void
1.103 markus 118: mm_request_send(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 119: {
1.103 markus 120: size_t mlen = sshbuf_len(m);
1.1 provos 121: u_char buf[5];
122:
1.8 markus 123: debug3("%s entering: type %d", __func__, type);
1.1 provos 124:
1.103 markus 125: if (mlen >= 0xffffffff)
126: fatal("%s: bad length %zu", __func__, mlen);
127: POKE_U32(buf, mlen + 1);
1.10 deraadt 128: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 129: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 130: fatal("%s: write: %s", __func__, strerror(errno));
1.103 markus 131: if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen)
1.40 avsm 132: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 133: }
134:
135: void
1.103 markus 136: mm_request_receive(int sock, struct sshbuf *m)
1.1 provos 137: {
1.103 markus 138: u_char buf[4], *p = NULL;
1.13 deraadt 139: u_int msg_len;
1.103 markus 140: int r;
1.1 provos 141:
1.8 markus 142: debug3("%s entering", __func__);
1.1 provos 143:
1.40 avsm 144: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
145: if (errno == EPIPE)
1.32 markus 146: cleanup_exit(255);
1.40 avsm 147: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 148: }
1.103 markus 149: msg_len = PEEK_U32(buf);
1.1 provos 150: if (msg_len > 256 * 1024)
1.8 markus 151: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.103 markus 152: sshbuf_reset(m);
153: if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
154: fatal("%s: buffer error: %s", __func__, ssh_err(r));
155: if (atomicio(read, sock, p, msg_len) != msg_len)
1.40 avsm 156: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 157: }
158:
159: void
1.103 markus 160: mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 161: {
162: u_char rtype;
1.103 markus 163: int r;
1.1 provos 164:
1.8 markus 165: debug3("%s entering: type %d", __func__, type);
1.1 provos 166:
1.36 avsm 167: mm_request_receive(sock, m);
1.103 markus 168: if ((r = sshbuf_get_u8(m, &rtype)) != 0)
169: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 170: if (rtype != type)
1.8 markus 171: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 172: rtype, type);
173: }
174:
1.80 markus 175: #ifdef WITH_OPENSSL
1.1 provos 176: DH *
177: mm_choose_dh(int min, int nbits, int max)
178: {
179: BIGNUM *p, *g;
1.103 markus 180: int r;
181: u_char success = 0;
182: struct sshbuf *m;
1.1 provos 183:
1.103 markus 184: if ((m = sshbuf_new()) == NULL)
185: fatal("%s: sshbuf_new failed", __func__);
186: if ((r = sshbuf_put_u32(m, min)) != 0 ||
187: (r = sshbuf_put_u32(m, nbits)) != 0 ||
188: (r = sshbuf_put_u32(m, max)) != 0)
189: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 190:
1.103 markus 191: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
1.1 provos 192:
1.8 markus 193: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.103 markus 194: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m);
1.1 provos 195:
1.103 markus 196: if ((r = sshbuf_get_u8(m, &success)) != 0)
197: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 198: if (success == 0)
1.8 markus 199: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 200:
201: if ((p = BN_new()) == NULL)
1.8 markus 202: fatal("%s: BN_new failed", __func__);
1.3 markus 203: if ((g = BN_new()) == NULL)
1.8 markus 204: fatal("%s: BN_new failed", __func__);
1.103 markus 205: if ((r = sshbuf_get_bignum2(m, p)) != 0 ||
206: (r = sshbuf_get_bignum2(m, g)) != 0)
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
1.91 markus 217: mm_key_sign(struct sshkey *key, u_char **sigp, u_int *lenp,
1.86 markus 218: const u_char *data, u_int datalen, const char *hostkey_alg)
1.1 provos 219: {
1.83 markus 220: struct kex *kex = *pmonitor->m_pkex;
1.103 markus 221: struct sshbuf *m;
222: size_t xxxlen;
223: u_int ndx = kex->host_key_index(key, 0, active_state);
224: int r;
1.1 provos 225:
1.8 markus 226: debug3("%s entering", __func__);
1.1 provos 227:
1.103 markus 228: if ((m = sshbuf_new()) == NULL)
229: fatal("%s: sshbuf_new failed", __func__);
230: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
231: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
232: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0)
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);
239: if ((r = sshbuf_get_string(m, sigp, &xxxlen)) != 0)
240: fatal("%s: buffer error: %s", __func__, ssh_err(r));
241: if (xxxlen > 0xffffffff)
242: fatal("%s: bad length %zu", __func__, xxxlen);
243: *lenp = xxxlen; /* XXX fix API: size_t vs u_int */
244: sshbuf_free(m);
1.1 provos 245:
246: return (0);
247: }
248:
249: struct passwd *
1.37 dtucker 250: mm_getpwnamallow(const char *username)
1.1 provos 251: {
1.93 djm 252: struct ssh *ssh = active_state; /* XXX */
1.103 markus 253: struct sshbuf *m;
1.1 provos 254: struct passwd *pw;
1.103 markus 255: size_t len;
256: u_int i;
1.55 dtucker 257: ServerOptions *newopts;
1.103 markus 258: int r;
259: u_char ok;
260: const u_char *p;
1.1 provos 261:
1.8 markus 262: debug3("%s entering", __func__);
1.1 provos 263:
1.103 markus 264: if ((m = sshbuf_new()) == NULL)
265: fatal("%s: sshbuf_new failed", __func__);
266: if ((r = sshbuf_put_cstring(m, username)) != 0)
267: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 268:
1.103 markus 269: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 270:
1.8 markus 271: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 272: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 273:
1.103 markus 274: if ((r = sshbuf_get_u8(m, &ok)) != 0)
275: fatal("%s: buffer error: %s", __func__, ssh_err(r));
276: if (ok == 0) {
1.60 dtucker 277: pw = NULL;
278: goto out;
1.1 provos 279: }
1.103 markus 280:
281: /* XXX don't like passing struct passwd like this */
282: pw = xcalloc(sizeof(*pw), 1);
283: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
284: fatal("%s: buffer error: %s", __func__, ssh_err(r));
285: if (len != sizeof(*pw))
1.8 markus 286: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 287: memcpy(pw, p, sizeof(*pw));
288:
289: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
290: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
291: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
292: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
293: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
294: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
295: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 296:
1.60 dtucker 297: out:
1.55 dtucker 298: /* copy options block as a Match directive may have changed some */
1.103 markus 299: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
300: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 301: if (len != sizeof(*newopts))
302: fatal("%s: option block size mismatch", __func__);
1.103 markus 303: newopts = xcalloc(sizeof(*newopts), 1);
304: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 305:
306: #define M_CP_STROPT(x) do { \
1.103 markus 307: if (newopts->x != NULL) { \
308: if ((r = sshbuf_get_cstring(m, \
309: &newopts->x, NULL)) != 0) \
310: fatal("%s: buffer error: %s", \
311: __func__, ssh_err(r)); \
312: } \
1.71 djm 313: } while (0)
1.72 djm 314: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 315: newopts->x = newopts->nx == 0 ? \
316: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 317: for (i = 0; i < newopts->nx; i++) { \
318: if ((r = sshbuf_get_cstring(m, \
319: &newopts->x[i], NULL)) != 0) \
320: fatal("%s: buffer error: %s", \
321: __func__, ssh_err(r)); \
322: } \
1.72 djm 323: } while (0)
1.71 djm 324: /* See comment in servconf.h */
325: COPY_MATCH_STRING_OPTS();
326: #undef M_CP_STROPT
1.72 djm 327: #undef M_CP_STRARRAYOPT
1.71 djm 328:
1.55 dtucker 329: copy_set_server_options(&options, newopts, 1);
1.90 djm 330: log_change_level(options.log_level);
1.93 djm 331: process_permitopen(ssh, &options);
1.76 djm 332: free(newopts);
1.55 dtucker 333:
1.103 markus 334: sshbuf_free(m);
1.1 provos 335:
336: return (pw);
1.6 djm 337: }
338:
1.33 markus 339: char *
340: mm_auth2_read_banner(void)
1.6 djm 341: {
1.103 markus 342: struct sshbuf *m;
1.6 djm 343: char *banner;
1.103 markus 344: int r;
1.6 djm 345:
1.8 markus 346: debug3("%s entering", __func__);
1.6 djm 347:
1.103 markus 348: if ((m = sshbuf_new()) == NULL)
349: fatal("%s: sshbuf_new failed", __func__);
350: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
351: sshbuf_reset(m);
1.6 djm 352:
1.33 markus 353: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 354: MONITOR_ANS_AUTH2_READ_BANNER, m);
355: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
356: fatal("%s: buffer error: %s", __func__, ssh_err(r));
357: sshbuf_free(m);
1.10 deraadt 358:
1.33 markus 359: /* treat empty banner as missing banner */
360: if (strlen(banner) == 0) {
1.76 djm 361: free(banner);
1.33 markus 362: banner = NULL;
363: }
1.6 djm 364: return (banner);
1.1 provos 365: }
366:
367: /* Inform the privileged process about service and style */
368:
369: void
370: mm_inform_authserv(char *service, char *style)
371: {
1.103 markus 372: struct sshbuf *m;
373: int r;
1.1 provos 374:
1.8 markus 375: debug3("%s entering", __func__);
1.1 provos 376:
1.103 markus 377: if ((m = sshbuf_new()) == NULL)
378: fatal("%s: sshbuf_new failed", __func__);
379: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
380: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
381: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 382:
1.103 markus 383: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 384:
1.103 markus 385: sshbuf_free(m);
1.1 provos 386: }
387:
388: /* Do the password authentication */
389: int
1.99 djm 390: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 391: {
1.103 markus 392: struct sshbuf *m;
393: int r, authenticated = 0;
1.1 provos 394:
1.8 markus 395: debug3("%s entering", __func__);
1.1 provos 396:
1.103 markus 397: if ((m = sshbuf_new()) == NULL)
398: fatal("%s: sshbuf_new failed", __func__);
399: if ((r = sshbuf_put_cstring(m, password)) != 0)
400: fatal("%s: buffer error: %s", __func__, ssh_err(r));
401: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 402:
1.8 markus 403: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 404: mm_request_receive_expect(pmonitor->m_recvfd,
405: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 406:
1.103 markus 407: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
408: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 409:
1.103 markus 410: sshbuf_free(m);
1.1 provos 411:
1.3 markus 412: debug3("%s: user %sauthenticated",
1.8 markus 413: __func__, authenticated ? "" : "not ");
1.1 provos 414: return (authenticated);
415: }
416:
417: int
1.99 djm 418: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
419: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 420: {
1.85 djm 421: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 422: pubkey_auth_attempt, authoptp));
1.1 provos 423: }
424:
425: int
1.88 djm 426: mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host,
1.91 markus 427: struct sshkey *key)
1.1 provos 428: {
1.99 djm 429: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 430: }
431:
432: int
1.88 djm 433: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 434: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 435: {
1.103 markus 436: struct sshbuf *m;
1.99 djm 437: int r, allowed = 0;
438: struct sshauthopt *opts = NULL;
1.1 provos 439:
1.8 markus 440: debug3("%s entering", __func__);
1.1 provos 441:
1.99 djm 442: if (authoptp != NULL)
443: *authoptp = NULL;
444:
1.103 markus 445: if ((m = sshbuf_new()) == NULL)
446: fatal("%s: sshbuf_new failed", __func__);
447: if ((r = sshbuf_put_u32(m, type)) != 0 ||
448: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
449: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
450: (r = sshkey_puts(key, m)) != 0 ||
451: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
452: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 453:
1.103 markus 454: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 455:
1.8 markus 456: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 457: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 458: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 459:
1.103 markus 460: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
461: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 462: if (allowed && type == MM_USERKEY) {
1.103 markus 463: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 464: fatal("%s: sshauthopt_deserialise: %s",
465: __func__, ssh_err(r));
466: }
1.103 markus 467: sshbuf_free(m);
1.1 provos 468:
1.99 djm 469: if (authoptp != NULL) {
470: *authoptp = opts;
471: opts = NULL;
472: }
473: sshauthopt_free(opts);
1.1 provos 474:
1.99 djm 475: return allowed;
1.1 provos 476: }
477:
1.3 markus 478: /*
1.1 provos 479: * This key verify needs to send the key type along, because the
480: * privileged parent makes the decision if the key is allowed
481: * for authentication.
482: */
483:
484: int
1.92 markus 485: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.96 djm 486: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
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;
1.1 provos 491:
1.8 markus 492: debug3("%s entering", __func__);
1.1 provos 493:
494:
1.103 markus 495: if ((m = sshbuf_new()) == NULL)
496: fatal("%s: sshbuf_new failed", __func__);
497: if ((r = sshkey_puts(key, m)) != 0 ||
498: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
499: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
500: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
501: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 502:
1.103 markus 503: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 504:
1.8 markus 505: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 506: mm_request_receive_expect(pmonitor->m_recvfd,
507: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 508:
1.103 markus 509: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0)
510: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 511:
1.103 markus 512: sshbuf_free(m);
1.1 provos 513:
1.92 markus 514: if (encoded_ret != 0)
515: return SSH_ERR_SIGNATURE_INVALID;
516: return 0;
1.1 provos 517: }
518:
519: void
1.36 avsm 520: mm_send_keystate(struct monitor *monitor)
1.1 provos 521: {
1.82 markus 522: struct ssh *ssh = active_state; /* XXX */
523: struct sshbuf *m;
524: int r;
525:
526: if ((m = sshbuf_new()) == NULL)
527: fatal("%s: sshbuf_new failed", __func__);
528: if ((r = ssh_packet_get_state(ssh, m)) != 0)
529: fatal("%s: get_state failed: %s",
530: __func__, ssh_err(r));
531: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 532: debug3("%s: Finished sending state", __func__);
1.82 markus 533: sshbuf_free(m);
1.1 provos 534: }
535:
536: int
1.42 deraadt 537: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 538: {
1.103 markus 539: struct sshbuf *m;
1.39 dtucker 540: char *p, *msg;
1.102 markus 541: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 542:
543: /* Kludge: ensure there are fds free to receive the pty/tty */
544: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
545: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
546: error("%s: cannot allocate fds for pty", __func__);
547: if (tmp1 > 0)
548: close(tmp1);
549: if (tmp2 > 0)
550: close(tmp2);
551: return 0;
552: }
553: close(tmp1);
554: close(tmp2);
1.1 provos 555:
1.103 markus 556: if ((m = sshbuf_new()) == NULL)
557: fatal("%s: sshbuf_new failed", __func__);
558: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 559:
1.8 markus 560: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 561: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 562:
1.103 markus 563: if ((r = sshbuf_get_u32(m, &success)) != 0)
564: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 565: if (success == 0) {
1.8 markus 566: debug3("%s: pty alloc failed", __func__);
1.103 markus 567: sshbuf_free(m);
1.1 provos 568: return (0);
569: }
1.103 markus 570: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
571: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
572: fatal("%s: buffer error: %s", __func__, ssh_err(r));
573: sshbuf_free(m);
1.1 provos 574:
575: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 576: free(p);
1.39 dtucker 577:
1.102 markus 578: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
579: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 580: free(msg);
1.1 provos 581:
1.58 djm 582: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
583: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
584: fatal("%s: receive fds failed", __func__);
1.1 provos 585:
586: /* Success */
587: return (1);
588: }
589:
590: void
1.32 markus 591: mm_session_pty_cleanup2(Session *s)
1.1 provos 592: {
1.103 markus 593: struct sshbuf *m;
594: int r;
1.1 provos 595:
596: if (s->ttyfd == -1)
597: return;
1.103 markus 598: if ((m = sshbuf_new()) == NULL)
599: fatal("%s: sshbuf_new failed", __func__);
600: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
601: fatal("%s: buffer error: %s", __func__, ssh_err(r));
602: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
603: sshbuf_free(m);
1.3 markus 604:
1.1 provos 605: /* closed dup'ed master */
1.62 djm 606: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
607: error("close(s->ptymaster/%d): %s",
608: s->ptymaster, strerror(errno));
1.1 provos 609:
610: /* unlink pty from session */
611: s->ttyfd = -1;
612: }
613:
614: /* Request process termination */
615:
616: void
617: mm_terminate(void)
618: {
1.103 markus 619: struct sshbuf *m;
1.1 provos 620:
1.103 markus 621: if ((m = sshbuf_new()) == NULL)
622: fatal("%s: sshbuf_new failed", __func__);
623: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
624: sshbuf_free(m);
1.1 provos 625: }
626:
1.2 markus 627: static void
1.1 provos 628: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
629: char ***prompts, u_int **echo_on)
630: {
1.10 deraadt 631: *name = xstrdup("");
632: *infotxt = xstrdup("");
1.1 provos 633: *numprompts = 1;
1.43 djm 634: *prompts = xcalloc(*numprompts, sizeof(char *));
635: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 636: (*echo_on)[0] = 0;
637: }
638:
639: int
640: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
641: u_int *numprompts, char ***prompts, u_int **echo_on)
642: {
1.103 markus 643: struct sshbuf *m;
1.21 markus 644: u_int success;
1.1 provos 645: char *challenge;
1.103 markus 646: int r;
1.1 provos 647:
1.8 markus 648: debug3("%s: entering", __func__);
1.1 provos 649:
1.103 markus 650: if ((m = sshbuf_new()) == NULL)
651: fatal("%s: sshbuf_new failed", __func__);
652: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 653:
1.103 markus 654: mm_request_receive_expect(pmonitor->m_recvfd,
655: MONITOR_ANS_BSDAUTHQUERY, m);
656: if ((r = sshbuf_get_u32(m, &success)) != 0)
657: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 658: if (success == 0) {
1.8 markus 659: debug3("%s: no challenge", __func__);
1.103 markus 660: sshbuf_free(m);
1.1 provos 661: return (-1);
662: }
663:
664: /* Get the challenge, and format the response */
1.103 markus 665: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
666: fatal("%s: buffer error: %s", __func__, ssh_err(r));
667: sshbuf_free(m);
1.1 provos 668:
669: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
670: (*prompts)[0] = challenge;
671:
1.8 markus 672: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 673:
674: return (0);
675: }
676:
677: int
678: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
679: {
1.103 markus 680: struct sshbuf *m;
681: int r, authok;
1.1 provos 682:
1.8 markus 683: debug3("%s: entering", __func__);
1.1 provos 684: if (numresponses != 1)
685: return (-1);
686:
1.103 markus 687: if ((m = sshbuf_new()) == NULL)
688: fatal("%s: sshbuf_new failed", __func__);
689: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
690: fatal("%s: buffer error: %s", __func__, ssh_err(r));
691: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 692:
1.7 mouring 693: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 694: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 695:
1.103 markus 696: if ((r = sshbuf_get_u32(m, &authok)) != 0)
697: fatal("%s: buffer error: %s", __func__, ssh_err(r));
698: sshbuf_free(m);
1.1 provos 699:
700: return ((authok == 0) ? -1 : 0);
701: }
1.29 markus 702:
703: #ifdef GSSAPI
704: OM_uint32
1.36 avsm 705: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 706: {
1.103 markus 707: struct sshbuf *m;
1.29 markus 708: OM_uint32 major;
1.103 markus 709: int r;
1.29 markus 710:
711: /* Client doesn't get to see the context */
712: *ctx = NULL;
713:
1.103 markus 714: if ((m = sshbuf_new()) == NULL)
715: fatal("%s: sshbuf_new failed", __func__);
716: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
717: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 718:
1.103 markus 719: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
720: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 721:
1.103 markus 722: if ((r = sshbuf_get_u32(m, &major)) != 0)
723: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 724:
1.103 markus 725: sshbuf_free(m);
1.29 markus 726: return (major);
727: }
728:
729: OM_uint32
730: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 731: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 732: {
1.103 markus 733: struct sshbuf *m;
1.29 markus 734: OM_uint32 major;
1.103 markus 735: u_int flags;
736: int r;
1.29 markus 737:
1.103 markus 738: if ((m = sshbuf_new()) == NULL)
739: fatal("%s: sshbuf_new failed", __func__);
740: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
741: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 742:
1.103 markus 743: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
744: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 745:
1.103 markus 746: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 747: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 748: fatal("%s: buffer error: %s", __func__, ssh_err(r));
749: if (flagsp != NULL) {
750: if ((r = sshbuf_get_u32(m, &flags)) != 0)
751: fatal("%s: buffer error: %s", __func__, ssh_err(r));
752: *flagsp = flags;
753: }
1.29 markus 754:
1.103 markus 755: sshbuf_free(m);
1.29 markus 756:
757: return (major);
1.35 markus 758: }
759:
760: OM_uint32
761: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
762: {
1.103 markus 763: struct sshbuf *m;
1.35 markus 764: OM_uint32 major;
1.103 markus 765: int r;
766:
767: if ((m = sshbuf_new()) == NULL)
768: fatal("%s: sshbuf_new failed", __func__);
769: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
770: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
771: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 772:
1.103 markus 773: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
774: mm_request_receive_expect(pmonitor->m_recvfd,
775: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 776:
1.103 markus 777: if ((r = sshbuf_get_u32(m, &major)) != 0)
778: fatal("%s: buffer error: %s", __func__, ssh_err(r));
779: sshbuf_free(m);
1.35 markus 780: return(major);
1.29 markus 781: }
782:
783: int
784: mm_ssh_gssapi_userok(char *user)
785: {
1.103 markus 786: struct sshbuf *m;
787: int r, authenticated = 0;
1.29 markus 788:
1.103 markus 789: if ((m = sshbuf_new()) == NULL)
790: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 791:
1.103 markus 792: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
793: mm_request_receive_expect(pmonitor->m_recvfd,
794: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 795:
1.103 markus 796: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
797: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 798:
1.103 markus 799: sshbuf_free(m);
1.29 markus 800: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
801: return (authenticated);
802: }
803: #endif /* GSSAPI */
![[BACK]](/icons/back.gif){kind=icon}
Return to monitor_wrap.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh