Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.106
1.106 ! markus 1: /* $OpenBSD: monitor_wrap.c,v 1.105 2018/07/10 09:36:58 sf 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"
1.106 ! markus 50: #include "sshkey.h"
1.50 deraadt 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
1.106 ! markus 217: mm_sshkey_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
! 218: const u_char *data, size_t datalen, const char *hostkey_alg, u_int compat)
1.1 provos 219: {
1.83 markus 220: struct kex *kex = *pmonitor->m_pkex;
1.103 markus 221: struct sshbuf *m;
222: u_int ndx = kex->host_key_index(key, 0, active_state);
223: int r;
1.1 provos 224:
1.8 markus 225: debug3("%s entering", __func__);
1.1 provos 226:
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 *
1.37 dtucker 247: mm_getpwnamallow(const char *username)
1.1 provos 248: {
1.93 djm 249: struct ssh *ssh = active_state; /* XXX */
1.103 markus 250: struct sshbuf *m;
1.1 provos 251: struct passwd *pw;
1.103 markus 252: size_t len;
253: u_int i;
1.55 dtucker 254: ServerOptions *newopts;
1.103 markus 255: int r;
256: u_char ok;
257: const u_char *p;
1.1 provos 258:
1.8 markus 259: debug3("%s entering", __func__);
1.1 provos 260:
1.103 markus 261: if ((m = sshbuf_new()) == NULL)
262: fatal("%s: sshbuf_new failed", __func__);
263: if ((r = sshbuf_put_cstring(m, username)) != 0)
264: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 265:
1.103 markus 266: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 267:
1.8 markus 268: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 269: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 270:
1.103 markus 271: if ((r = sshbuf_get_u8(m, &ok)) != 0)
272: fatal("%s: buffer error: %s", __func__, ssh_err(r));
273: if (ok == 0) {
1.60 dtucker 274: pw = NULL;
275: goto out;
1.1 provos 276: }
1.103 markus 277:
278: /* XXX don't like passing struct passwd like this */
279: pw = xcalloc(sizeof(*pw), 1);
280: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
281: fatal("%s: buffer error: %s", __func__, ssh_err(r));
282: if (len != sizeof(*pw))
1.8 markus 283: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 284: memcpy(pw, p, sizeof(*pw));
285:
286: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
287: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
288: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
289: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
290: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
291: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
292: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 293:
1.60 dtucker 294: out:
1.55 dtucker 295: /* copy options block as a Match directive may have changed some */
1.103 markus 296: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
297: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 298: if (len != sizeof(*newopts))
299: fatal("%s: option block size mismatch", __func__);
1.103 markus 300: newopts = xcalloc(sizeof(*newopts), 1);
301: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 302:
303: #define M_CP_STROPT(x) do { \
1.103 markus 304: if (newopts->x != NULL) { \
305: if ((r = sshbuf_get_cstring(m, \
306: &newopts->x, NULL)) != 0) \
307: fatal("%s: buffer error: %s", \
308: __func__, ssh_err(r)); \
309: } \
1.71 djm 310: } while (0)
1.72 djm 311: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 312: newopts->x = newopts->nx == 0 ? \
313: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 314: for (i = 0; i < newopts->nx; i++) { \
315: if ((r = sshbuf_get_cstring(m, \
316: &newopts->x[i], NULL)) != 0) \
317: fatal("%s: buffer error: %s", \
318: __func__, ssh_err(r)); \
319: } \
1.72 djm 320: } while (0)
1.71 djm 321: /* See comment in servconf.h */
322: COPY_MATCH_STRING_OPTS();
323: #undef M_CP_STROPT
1.72 djm 324: #undef M_CP_STRARRAYOPT
1.71 djm 325:
1.55 dtucker 326: copy_set_server_options(&options, newopts, 1);
1.90 djm 327: log_change_level(options.log_level);
1.93 djm 328: process_permitopen(ssh, &options);
1.76 djm 329: free(newopts);
1.55 dtucker 330:
1.103 markus 331: sshbuf_free(m);
1.1 provos 332:
333: return (pw);
1.6 djm 334: }
335:
1.33 markus 336: char *
337: mm_auth2_read_banner(void)
1.6 djm 338: {
1.103 markus 339: struct sshbuf *m;
1.6 djm 340: char *banner;
1.103 markus 341: int r;
1.6 djm 342:
1.8 markus 343: debug3("%s entering", __func__);
1.6 djm 344:
1.103 markus 345: if ((m = sshbuf_new()) == NULL)
346: fatal("%s: sshbuf_new failed", __func__);
347: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
348: sshbuf_reset(m);
1.6 djm 349:
1.33 markus 350: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 351: MONITOR_ANS_AUTH2_READ_BANNER, m);
352: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
353: fatal("%s: buffer error: %s", __func__, ssh_err(r));
354: sshbuf_free(m);
1.10 deraadt 355:
1.33 markus 356: /* treat empty banner as missing banner */
357: if (strlen(banner) == 0) {
1.76 djm 358: free(banner);
1.33 markus 359: banner = NULL;
360: }
1.6 djm 361: return (banner);
1.1 provos 362: }
363:
364: /* Inform the privileged process about service and style */
365:
366: void
367: mm_inform_authserv(char *service, char *style)
368: {
1.103 markus 369: struct sshbuf *m;
370: int r;
1.1 provos 371:
1.8 markus 372: debug3("%s entering", __func__);
1.1 provos 373:
1.103 markus 374: if ((m = sshbuf_new()) == NULL)
375: fatal("%s: sshbuf_new failed", __func__);
376: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
377: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
378: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 379:
1.103 markus 380: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 381:
1.103 markus 382: sshbuf_free(m);
1.1 provos 383: }
384:
385: /* Do the password authentication */
386: int
1.99 djm 387: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 388: {
1.103 markus 389: struct sshbuf *m;
390: int r, authenticated = 0;
1.1 provos 391:
1.8 markus 392: debug3("%s entering", __func__);
1.1 provos 393:
1.103 markus 394: if ((m = sshbuf_new()) == NULL)
395: fatal("%s: sshbuf_new failed", __func__);
396: if ((r = sshbuf_put_cstring(m, password)) != 0)
397: fatal("%s: buffer error: %s", __func__, ssh_err(r));
398: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 399:
1.8 markus 400: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 401: mm_request_receive_expect(pmonitor->m_recvfd,
402: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 403:
1.103 markus 404: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
405: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 406:
1.103 markus 407: sshbuf_free(m);
1.1 provos 408:
1.3 markus 409: debug3("%s: user %sauthenticated",
1.8 markus 410: __func__, authenticated ? "" : "not ");
1.1 provos 411: return (authenticated);
412: }
413:
414: int
1.99 djm 415: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
416: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 417: {
1.85 djm 418: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 419: pubkey_auth_attempt, authoptp));
1.1 provos 420: }
421:
422: int
1.88 djm 423: mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host,
1.91 markus 424: struct sshkey *key)
1.1 provos 425: {
1.99 djm 426: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 427: }
428:
429: int
1.88 djm 430: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 431: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 432: {
1.103 markus 433: struct sshbuf *m;
1.99 djm 434: int r, allowed = 0;
435: struct sshauthopt *opts = NULL;
1.1 provos 436:
1.8 markus 437: debug3("%s entering", __func__);
1.1 provos 438:
1.99 djm 439: if (authoptp != NULL)
440: *authoptp = NULL;
441:
1.103 markus 442: if ((m = sshbuf_new()) == NULL)
443: fatal("%s: sshbuf_new failed", __func__);
444: if ((r = sshbuf_put_u32(m, type)) != 0 ||
445: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
446: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
447: (r = sshkey_puts(key, m)) != 0 ||
448: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
449: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 450:
1.103 markus 451: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 452:
1.8 markus 453: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 454: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 455: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 456:
1.103 markus 457: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
458: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 459: if (allowed && type == MM_USERKEY) {
1.103 markus 460: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 461: fatal("%s: sshauthopt_deserialise: %s",
462: __func__, ssh_err(r));
463: }
1.103 markus 464: sshbuf_free(m);
1.1 provos 465:
1.99 djm 466: if (authoptp != NULL) {
467: *authoptp = opts;
468: opts = NULL;
469: }
470: sshauthopt_free(opts);
1.1 provos 471:
1.99 djm 472: return allowed;
1.1 provos 473: }
474:
1.3 markus 475: /*
1.1 provos 476: * This key verify needs to send the key type along, because the
477: * privileged parent makes the decision if the key is allowed
478: * for authentication.
479: */
480:
481: int
1.92 markus 482: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.96 djm 483: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
1.1 provos 484: {
1.103 markus 485: struct sshbuf *m;
1.92 markus 486: u_int encoded_ret = 0;
1.103 markus 487: int r;
1.1 provos 488:
1.8 markus 489: debug3("%s entering", __func__);
1.1 provos 490:
491:
1.103 markus 492: if ((m = sshbuf_new()) == NULL)
493: fatal("%s: sshbuf_new failed", __func__);
494: if ((r = sshkey_puts(key, m)) != 0 ||
495: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
496: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
497: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
498: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 499:
1.103 markus 500: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 501:
1.8 markus 502: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 503: mm_request_receive_expect(pmonitor->m_recvfd,
504: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 505:
1.103 markus 506: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0)
507: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 508:
1.103 markus 509: sshbuf_free(m);
1.1 provos 510:
1.92 markus 511: if (encoded_ret != 0)
512: return SSH_ERR_SIGNATURE_INVALID;
513: return 0;
1.1 provos 514: }
515:
516: void
1.36 avsm 517: mm_send_keystate(struct monitor *monitor)
1.1 provos 518: {
1.82 markus 519: struct ssh *ssh = active_state; /* XXX */
520: struct sshbuf *m;
521: int r;
522:
523: if ((m = sshbuf_new()) == NULL)
524: fatal("%s: sshbuf_new failed", __func__);
525: if ((r = ssh_packet_get_state(ssh, m)) != 0)
526: fatal("%s: get_state failed: %s",
527: __func__, ssh_err(r));
528: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 529: debug3("%s: Finished sending state", __func__);
1.82 markus 530: sshbuf_free(m);
1.1 provos 531: }
532:
533: int
1.42 deraadt 534: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 535: {
1.103 markus 536: struct sshbuf *m;
1.39 dtucker 537: char *p, *msg;
1.102 markus 538: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 539:
540: /* Kludge: ensure there are fds free to receive the pty/tty */
541: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
542: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
543: error("%s: cannot allocate fds for pty", __func__);
544: if (tmp1 > 0)
545: close(tmp1);
546: if (tmp2 > 0)
547: close(tmp2);
548: return 0;
549: }
550: close(tmp1);
551: close(tmp2);
1.1 provos 552:
1.103 markus 553: if ((m = sshbuf_new()) == NULL)
554: fatal("%s: sshbuf_new failed", __func__);
555: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 556:
1.8 markus 557: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 558: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 559:
1.103 markus 560: if ((r = sshbuf_get_u32(m, &success)) != 0)
561: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 562: if (success == 0) {
1.8 markus 563: debug3("%s: pty alloc failed", __func__);
1.103 markus 564: sshbuf_free(m);
1.1 provos 565: return (0);
566: }
1.103 markus 567: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
568: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
569: fatal("%s: buffer error: %s", __func__, ssh_err(r));
570: sshbuf_free(m);
1.1 provos 571:
572: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 573: free(p);
1.39 dtucker 574:
1.102 markus 575: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
576: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 577: free(msg);
1.1 provos 578:
1.58 djm 579: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
580: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
581: fatal("%s: receive fds failed", __func__);
1.1 provos 582:
583: /* Success */
584: return (1);
585: }
586:
587: void
1.32 markus 588: mm_session_pty_cleanup2(Session *s)
1.1 provos 589: {
1.103 markus 590: struct sshbuf *m;
591: int r;
1.1 provos 592:
593: if (s->ttyfd == -1)
594: return;
1.103 markus 595: if ((m = sshbuf_new()) == NULL)
596: fatal("%s: sshbuf_new failed", __func__);
597: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
598: fatal("%s: buffer error: %s", __func__, ssh_err(r));
599: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
600: sshbuf_free(m);
1.3 markus 601:
1.1 provos 602: /* closed dup'ed master */
1.62 djm 603: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
604: error("close(s->ptymaster/%d): %s",
605: s->ptymaster, strerror(errno));
1.1 provos 606:
607: /* unlink pty from session */
608: s->ttyfd = -1;
609: }
610:
611: /* Request process termination */
612:
613: void
614: mm_terminate(void)
615: {
1.103 markus 616: struct sshbuf *m;
1.1 provos 617:
1.103 markus 618: if ((m = sshbuf_new()) == NULL)
619: fatal("%s: sshbuf_new failed", __func__);
620: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
621: sshbuf_free(m);
1.1 provos 622: }
623:
1.2 markus 624: static void
1.1 provos 625: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
626: char ***prompts, u_int **echo_on)
627: {
1.10 deraadt 628: *name = xstrdup("");
629: *infotxt = xstrdup("");
1.1 provos 630: *numprompts = 1;
1.43 djm 631: *prompts = xcalloc(*numprompts, sizeof(char *));
632: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 633: (*echo_on)[0] = 0;
634: }
635:
636: int
637: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
638: u_int *numprompts, char ***prompts, u_int **echo_on)
639: {
1.103 markus 640: struct sshbuf *m;
1.21 markus 641: u_int success;
1.1 provos 642: char *challenge;
1.103 markus 643: int r;
1.1 provos 644:
1.8 markus 645: debug3("%s: entering", __func__);
1.1 provos 646:
1.103 markus 647: if ((m = sshbuf_new()) == NULL)
648: fatal("%s: sshbuf_new failed", __func__);
649: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 650:
1.103 markus 651: mm_request_receive_expect(pmonitor->m_recvfd,
652: MONITOR_ANS_BSDAUTHQUERY, m);
653: if ((r = sshbuf_get_u32(m, &success)) != 0)
654: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 655: if (success == 0) {
1.8 markus 656: debug3("%s: no challenge", __func__);
1.103 markus 657: sshbuf_free(m);
1.1 provos 658: return (-1);
659: }
660:
661: /* Get the challenge, and format the response */
1.103 markus 662: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
663: fatal("%s: buffer error: %s", __func__, ssh_err(r));
664: sshbuf_free(m);
1.1 provos 665:
666: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
667: (*prompts)[0] = challenge;
668:
1.8 markus 669: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 670:
671: return (0);
672: }
673:
674: int
675: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
676: {
1.103 markus 677: struct sshbuf *m;
678: int r, authok;
1.1 provos 679:
1.8 markus 680: debug3("%s: entering", __func__);
1.1 provos 681: if (numresponses != 1)
682: return (-1);
683:
1.103 markus 684: if ((m = sshbuf_new()) == NULL)
685: fatal("%s: sshbuf_new failed", __func__);
686: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
687: fatal("%s: buffer error: %s", __func__, ssh_err(r));
688: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 689:
1.7 mouring 690: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 691: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 692:
1.103 markus 693: if ((r = sshbuf_get_u32(m, &authok)) != 0)
694: fatal("%s: buffer error: %s", __func__, ssh_err(r));
695: sshbuf_free(m);
1.1 provos 696:
697: return ((authok == 0) ? -1 : 0);
698: }
1.29 markus 699:
700: #ifdef GSSAPI
701: OM_uint32
1.36 avsm 702: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 703: {
1.103 markus 704: struct sshbuf *m;
1.29 markus 705: OM_uint32 major;
1.103 markus 706: int r;
1.29 markus 707:
708: /* Client doesn't get to see the context */
709: *ctx = NULL;
710:
1.103 markus 711: if ((m = sshbuf_new()) == NULL)
712: fatal("%s: sshbuf_new failed", __func__);
713: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
714: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 715:
1.103 markus 716: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
717: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 718:
1.103 markus 719: if ((r = sshbuf_get_u32(m, &major)) != 0)
720: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 721:
1.103 markus 722: sshbuf_free(m);
1.29 markus 723: return (major);
724: }
725:
726: OM_uint32
727: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 728: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 729: {
1.103 markus 730: struct sshbuf *m;
1.29 markus 731: OM_uint32 major;
1.103 markus 732: u_int flags;
733: int r;
1.29 markus 734:
1.103 markus 735: if ((m = sshbuf_new()) == NULL)
736: fatal("%s: sshbuf_new failed", __func__);
737: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
738: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 739:
1.103 markus 740: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
741: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 742:
1.103 markus 743: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 744: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 745: fatal("%s: buffer error: %s", __func__, ssh_err(r));
746: if (flagsp != NULL) {
747: if ((r = sshbuf_get_u32(m, &flags)) != 0)
748: fatal("%s: buffer error: %s", __func__, ssh_err(r));
749: *flagsp = flags;
750: }
1.29 markus 751:
1.103 markus 752: sshbuf_free(m);
1.29 markus 753:
754: return (major);
1.35 markus 755: }
756:
757: OM_uint32
758: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
759: {
1.103 markus 760: struct sshbuf *m;
1.35 markus 761: OM_uint32 major;
1.103 markus 762: int r;
763:
764: if ((m = sshbuf_new()) == NULL)
765: fatal("%s: sshbuf_new failed", __func__);
766: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
767: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
768: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 769:
1.103 markus 770: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
771: mm_request_receive_expect(pmonitor->m_recvfd,
772: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 773:
1.103 markus 774: if ((r = sshbuf_get_u32(m, &major)) != 0)
775: fatal("%s: buffer error: %s", __func__, ssh_err(r));
776: sshbuf_free(m);
1.35 markus 777: return(major);
1.29 markus 778: }
779:
780: int
781: mm_ssh_gssapi_userok(char *user)
782: {
1.103 markus 783: struct sshbuf *m;
784: int r, authenticated = 0;
1.29 markus 785:
1.103 markus 786: if ((m = sshbuf_new()) == NULL)
787: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 788:
1.103 markus 789: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
790: mm_request_receive_expect(pmonitor->m_recvfd,
791: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 792:
1.103 markus 793: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
794: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 795:
1.103 markus 796: sshbuf_free(m);
1.29 markus 797: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
798: return (authenticated);
799: }
800: #endif /* GSSAPI */
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