Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.103
1.103 ! markus 1: /* $OpenBSD: monitor_wrap.c,v 1.102 2018/07/09 21:26:02 markus 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 */
1.101 sf 76: extern z_stream incoming_stream;
77: extern z_stream outgoing_stream;
1.7 mouring 78: extern struct monitor *pmonitor;
1.102 markus 79: extern struct sshbuf *loginmsg;
1.55 dtucker 80: extern ServerOptions options;
1.73 djm 81:
82: void
83: mm_log_handler(LogLevel level, const char *msg, void *ctx)
84: {
1.103 ! markus 85: struct sshbuf *log_msg;
1.73 djm 86: struct monitor *mon = (struct monitor *)ctx;
1.103 ! markus 87: int r;
! 88: size_t len;
1.73 djm 89:
90: if (mon->m_log_sendfd == -1)
91: fatal("%s: no log channel", __func__);
92:
1.103 ! markus 93: if ((log_msg = sshbuf_new()) == NULL)
! 94: fatal("%s: sshbuf_new failed", __func__);
1.73 djm 95:
1.103 ! markus 96: if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */
! 97: (r = sshbuf_put_u32(log_msg, level)) != 0 ||
! 98: (r = sshbuf_put_cstring(log_msg, msg)) != 0)
! 99: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 100: if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
! 101: fatal("%s: bad length %zu", __func__, len);
! 102: POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4);
! 103: if (atomicio(vwrite, mon->m_log_sendfd,
! 104: sshbuf_mutable_ptr(log_msg), len) != len)
1.73 djm 105: fatal("%s: write: %s", __func__, strerror(errno));
1.103 ! markus 106: sshbuf_free(log_msg);
1.73 djm 107: }
1.1 provos 108:
1.32 markus 109: int
110: mm_is_monitor(void)
111: {
112: /*
113: * m_pid is only set in the privileged part, and
114: * points to the unprivileged child.
115: */
1.34 markus 116: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 117: }
118:
1.1 provos 119: void
1.103 ! markus 120: mm_request_send(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 121: {
1.103 ! markus 122: size_t mlen = sshbuf_len(m);
1.1 provos 123: u_char buf[5];
124:
1.8 markus 125: debug3("%s entering: type %d", __func__, type);
1.1 provos 126:
1.103 ! markus 127: if (mlen >= 0xffffffff)
! 128: fatal("%s: bad length %zu", __func__, mlen);
! 129: POKE_U32(buf, mlen + 1);
1.10 deraadt 130: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 131: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 132: fatal("%s: write: %s", __func__, strerror(errno));
1.103 ! markus 133: if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen)
1.40 avsm 134: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 135: }
136:
137: void
1.103 ! markus 138: mm_request_receive(int sock, struct sshbuf *m)
1.1 provos 139: {
1.103 ! markus 140: u_char buf[4], *p = NULL;
1.13 deraadt 141: u_int msg_len;
1.103 ! markus 142: int r;
1.1 provos 143:
1.8 markus 144: debug3("%s entering", __func__);
1.1 provos 145:
1.40 avsm 146: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
147: if (errno == EPIPE)
1.32 markus 148: cleanup_exit(255);
1.40 avsm 149: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 150: }
1.103 ! markus 151: msg_len = PEEK_U32(buf);
1.1 provos 152: if (msg_len > 256 * 1024)
1.8 markus 153: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.103 ! markus 154: sshbuf_reset(m);
! 155: if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
! 156: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 157: if (atomicio(read, sock, p, msg_len) != msg_len)
1.40 avsm 158: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 159: }
160:
161: void
1.103 ! markus 162: mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 163: {
164: u_char rtype;
1.103 ! markus 165: int r;
1.1 provos 166:
1.8 markus 167: debug3("%s entering: type %d", __func__, type);
1.1 provos 168:
1.36 avsm 169: mm_request_receive(sock, m);
1.103 ! markus 170: if ((r = sshbuf_get_u8(m, &rtype)) != 0)
! 171: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 172: if (rtype != type)
1.8 markus 173: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 174: rtype, type);
175: }
176:
1.80 markus 177: #ifdef WITH_OPENSSL
1.1 provos 178: DH *
179: mm_choose_dh(int min, int nbits, int max)
180: {
181: BIGNUM *p, *g;
1.103 ! markus 182: int r;
! 183: u_char success = 0;
! 184: struct sshbuf *m;
1.1 provos 185:
1.103 ! markus 186: if ((m = sshbuf_new()) == NULL)
! 187: fatal("%s: sshbuf_new failed", __func__);
! 188: if ((r = sshbuf_put_u32(m, min)) != 0 ||
! 189: (r = sshbuf_put_u32(m, nbits)) != 0 ||
! 190: (r = sshbuf_put_u32(m, max)) != 0)
! 191: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 192:
1.103 ! markus 193: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
1.1 provos 194:
1.8 markus 195: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.103 ! markus 196: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m);
1.1 provos 197:
1.103 ! markus 198: if ((r = sshbuf_get_u8(m, &success)) != 0)
! 199: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 200: if (success == 0)
1.8 markus 201: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 202:
203: if ((p = BN_new()) == NULL)
1.8 markus 204: fatal("%s: BN_new failed", __func__);
1.3 markus 205: if ((g = BN_new()) == NULL)
1.8 markus 206: fatal("%s: BN_new failed", __func__);
1.103 ! markus 207: if ((r = sshbuf_get_bignum2(m, p)) != 0 ||
! 208: (r = sshbuf_get_bignum2(m, g)) != 0)
! 209: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 210:
1.103 ! markus 211: debug3("%s: remaining %zu", __func__, sshbuf_len(m));
! 212: sshbuf_free(m);
1.1 provos 213:
214: return (dh_new_group(g, p));
215: }
1.80 markus 216: #endif
1.1 provos 217:
218: int
1.91 markus 219: mm_key_sign(struct sshkey *key, u_char **sigp, u_int *lenp,
1.86 markus 220: const u_char *data, u_int datalen, const char *hostkey_alg)
1.1 provos 221: {
1.83 markus 222: struct kex *kex = *pmonitor->m_pkex;
1.103 ! markus 223: struct sshbuf *m;
! 224: size_t xxxlen;
! 225: u_int ndx = kex->host_key_index(key, 0, active_state);
! 226: int r;
1.1 provos 227:
1.8 markus 228: debug3("%s entering", __func__);
1.1 provos 229:
1.103 ! markus 230: if ((m = sshbuf_new()) == NULL)
! 231: fatal("%s: sshbuf_new failed", __func__);
! 232: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
! 233: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
! 234: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0)
! 235: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 236:
1.103 ! markus 237: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 238:
1.8 markus 239: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.103 ! markus 240: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
! 241: if ((r = sshbuf_get_string(m, sigp, &xxxlen)) != 0)
! 242: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 243: if (xxxlen > 0xffffffff)
! 244: fatal("%s: bad length %zu", __func__, xxxlen);
! 245: *lenp = xxxlen; /* XXX fix API: size_t vs u_int */
! 246: sshbuf_free(m);
1.1 provos 247:
248: return (0);
249: }
250:
251: struct passwd *
1.37 dtucker 252: mm_getpwnamallow(const char *username)
1.1 provos 253: {
1.93 djm 254: struct ssh *ssh = active_state; /* XXX */
1.103 ! markus 255: struct sshbuf *m;
1.1 provos 256: struct passwd *pw;
1.103 ! markus 257: size_t len;
! 258: u_int i;
1.55 dtucker 259: ServerOptions *newopts;
1.103 ! markus 260: int r;
! 261: u_char ok;
! 262: const u_char *p;
1.1 provos 263:
1.8 markus 264: debug3("%s entering", __func__);
1.1 provos 265:
1.103 ! markus 266: if ((m = sshbuf_new()) == NULL)
! 267: fatal("%s: sshbuf_new failed", __func__);
! 268: if ((r = sshbuf_put_cstring(m, username)) != 0)
! 269: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 270:
1.103 ! markus 271: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 272:
1.8 markus 273: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 ! markus 274: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 275:
1.103 ! markus 276: if ((r = sshbuf_get_u8(m, &ok)) != 0)
! 277: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 278: if (ok == 0) {
1.60 dtucker 279: pw = NULL;
280: goto out;
1.1 provos 281: }
1.103 ! markus 282:
! 283: /* XXX don't like passing struct passwd like this */
! 284: pw = xcalloc(sizeof(*pw), 1);
! 285: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
! 286: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 287: if (len != sizeof(*pw))
1.8 markus 288: fatal("%s: struct passwd size mismatch", __func__);
1.103 ! markus 289: memcpy(pw, p, sizeof(*pw));
! 290:
! 291: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
! 292: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
! 293: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
! 294: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
! 295: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
! 296: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
! 297: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 298:
1.60 dtucker 299: out:
1.55 dtucker 300: /* copy options block as a Match directive may have changed some */
1.103 ! markus 301: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
! 302: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 303: if (len != sizeof(*newopts))
304: fatal("%s: option block size mismatch", __func__);
1.103 ! markus 305: newopts = xcalloc(sizeof(*newopts), 1);
! 306: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 307:
308: #define M_CP_STROPT(x) do { \
1.103 ! markus 309: if (newopts->x != NULL) { \
! 310: if ((r = sshbuf_get_cstring(m, \
! 311: &newopts->x, NULL)) != 0) \
! 312: fatal("%s: buffer error: %s", \
! 313: __func__, ssh_err(r)); \
! 314: } \
1.71 djm 315: } while (0)
1.72 djm 316: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 317: newopts->x = newopts->nx == 0 ? \
318: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 ! markus 319: for (i = 0; i < newopts->nx; i++) { \
! 320: if ((r = sshbuf_get_cstring(m, \
! 321: &newopts->x[i], NULL)) != 0) \
! 322: fatal("%s: buffer error: %s", \
! 323: __func__, ssh_err(r)); \
! 324: } \
1.72 djm 325: } while (0)
1.71 djm 326: /* See comment in servconf.h */
327: COPY_MATCH_STRING_OPTS();
328: #undef M_CP_STROPT
1.72 djm 329: #undef M_CP_STRARRAYOPT
1.71 djm 330:
1.55 dtucker 331: copy_set_server_options(&options, newopts, 1);
1.90 djm 332: log_change_level(options.log_level);
1.93 djm 333: process_permitopen(ssh, &options);
1.76 djm 334: free(newopts);
1.55 dtucker 335:
1.103 ! markus 336: sshbuf_free(m);
1.1 provos 337:
338: return (pw);
1.6 djm 339: }
340:
1.33 markus 341: char *
342: mm_auth2_read_banner(void)
1.6 djm 343: {
1.103 ! markus 344: struct sshbuf *m;
1.6 djm 345: char *banner;
1.103 ! markus 346: int r;
1.6 djm 347:
1.8 markus 348: debug3("%s entering", __func__);
1.6 djm 349:
1.103 ! markus 350: if ((m = sshbuf_new()) == NULL)
! 351: fatal("%s: sshbuf_new failed", __func__);
! 352: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
! 353: sshbuf_reset(m);
1.6 djm 354:
1.33 markus 355: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 ! markus 356: MONITOR_ANS_AUTH2_READ_BANNER, m);
! 357: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
! 358: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 359: sshbuf_free(m);
1.10 deraadt 360:
1.33 markus 361: /* treat empty banner as missing banner */
362: if (strlen(banner) == 0) {
1.76 djm 363: free(banner);
1.33 markus 364: banner = NULL;
365: }
1.6 djm 366: return (banner);
1.1 provos 367: }
368:
369: /* Inform the privileged process about service and style */
370:
371: void
372: mm_inform_authserv(char *service, char *style)
373: {
1.103 ! markus 374: struct sshbuf *m;
! 375: int r;
1.1 provos 376:
1.8 markus 377: debug3("%s entering", __func__);
1.1 provos 378:
1.103 ! markus 379: if ((m = sshbuf_new()) == NULL)
! 380: fatal("%s: sshbuf_new failed", __func__);
! 381: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
! 382: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
! 383: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 384:
1.103 ! markus 385: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 386:
1.103 ! markus 387: sshbuf_free(m);
1.1 provos 388: }
389:
390: /* Do the password authentication */
391: int
1.99 djm 392: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 393: {
1.103 ! markus 394: struct sshbuf *m;
! 395: int r, authenticated = 0;
1.1 provos 396:
1.8 markus 397: debug3("%s entering", __func__);
1.1 provos 398:
1.103 ! markus 399: if ((m = sshbuf_new()) == NULL)
! 400: fatal("%s: sshbuf_new failed", __func__);
! 401: if ((r = sshbuf_put_cstring(m, password)) != 0)
! 402: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 403: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 404:
1.8 markus 405: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 ! markus 406: mm_request_receive_expect(pmonitor->m_recvfd,
! 407: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 408:
1.103 ! markus 409: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
! 410: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 411:
1.103 ! markus 412: sshbuf_free(m);
1.1 provos 413:
1.3 markus 414: debug3("%s: user %sauthenticated",
1.8 markus 415: __func__, authenticated ? "" : "not ");
1.1 provos 416: return (authenticated);
417: }
418:
419: int
1.99 djm 420: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
421: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 422: {
1.85 djm 423: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 424: pubkey_auth_attempt, authoptp));
1.1 provos 425: }
426:
427: int
1.88 djm 428: mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host,
1.91 markus 429: struct sshkey *key)
1.1 provos 430: {
1.99 djm 431: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 432: }
433:
434: int
1.88 djm 435: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 436: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 437: {
1.103 ! markus 438: struct sshbuf *m;
1.99 djm 439: int r, allowed = 0;
440: struct sshauthopt *opts = NULL;
1.1 provos 441:
1.8 markus 442: debug3("%s entering", __func__);
1.1 provos 443:
1.99 djm 444: if (authoptp != NULL)
445: *authoptp = NULL;
446:
1.103 ! markus 447: if ((m = sshbuf_new()) == NULL)
! 448: fatal("%s: sshbuf_new failed", __func__);
! 449: if ((r = sshbuf_put_u32(m, type)) != 0 ||
! 450: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
! 451: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
! 452: (r = sshkey_puts(key, m)) != 0 ||
! 453: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
! 454: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 455:
1.103 ! markus 456: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 457:
1.8 markus 458: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 459: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 ! markus 460: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 461:
1.103 ! markus 462: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
! 463: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 464: if (allowed && type == MM_USERKEY) {
1.103 ! markus 465: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 466: fatal("%s: sshauthopt_deserialise: %s",
467: __func__, ssh_err(r));
468: }
1.103 ! markus 469: sshbuf_free(m);
1.1 provos 470:
1.99 djm 471: if (authoptp != NULL) {
472: *authoptp = opts;
473: opts = NULL;
474: }
475: sshauthopt_free(opts);
1.1 provos 476:
1.99 djm 477: return allowed;
1.1 provos 478: }
479:
1.3 markus 480: /*
1.1 provos 481: * This key verify needs to send the key type along, because the
482: * privileged parent makes the decision if the key is allowed
483: * for authentication.
484: */
485:
486: int
1.92 markus 487: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.96 djm 488: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
1.1 provos 489: {
1.103 ! markus 490: struct sshbuf *m;
1.92 markus 491: u_int encoded_ret = 0;
1.103 ! markus 492: int r;
1.1 provos 493:
1.8 markus 494: debug3("%s entering", __func__);
1.1 provos 495:
496:
1.103 ! markus 497: if ((m = sshbuf_new()) == NULL)
! 498: fatal("%s: sshbuf_new failed", __func__);
! 499: if ((r = sshkey_puts(key, m)) != 0 ||
! 500: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
! 501: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
! 502: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
! 503: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 504:
1.103 ! markus 505: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 506:
1.8 markus 507: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 ! markus 508: mm_request_receive_expect(pmonitor->m_recvfd,
! 509: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 510:
1.103 ! markus 511: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0)
! 512: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 513:
1.103 ! markus 514: sshbuf_free(m);
1.1 provos 515:
1.92 markus 516: if (encoded_ret != 0)
517: return SSH_ERR_SIGNATURE_INVALID;
518: return 0;
1.1 provos 519: }
520:
521: void
1.36 avsm 522: mm_send_keystate(struct monitor *monitor)
1.1 provos 523: {
1.82 markus 524: struct ssh *ssh = active_state; /* XXX */
525: struct sshbuf *m;
526: int r;
527:
528: if ((m = sshbuf_new()) == NULL)
529: fatal("%s: sshbuf_new failed", __func__);
530: if ((r = ssh_packet_get_state(ssh, m)) != 0)
531: fatal("%s: get_state failed: %s",
532: __func__, ssh_err(r));
533: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 534: debug3("%s: Finished sending state", __func__);
1.82 markus 535: sshbuf_free(m);
1.1 provos 536: }
537:
538: int
1.42 deraadt 539: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 540: {
1.103 ! markus 541: struct sshbuf *m;
1.39 dtucker 542: char *p, *msg;
1.102 markus 543: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 544:
545: /* Kludge: ensure there are fds free to receive the pty/tty */
546: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
547: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
548: error("%s: cannot allocate fds for pty", __func__);
549: if (tmp1 > 0)
550: close(tmp1);
551: if (tmp2 > 0)
552: close(tmp2);
553: return 0;
554: }
555: close(tmp1);
556: close(tmp2);
1.1 provos 557:
1.103 ! markus 558: if ((m = sshbuf_new()) == NULL)
! 559: fatal("%s: sshbuf_new failed", __func__);
! 560: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 561:
1.8 markus 562: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 ! markus 563: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 564:
1.103 ! markus 565: if ((r = sshbuf_get_u32(m, &success)) != 0)
! 566: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 567: if (success == 0) {
1.8 markus 568: debug3("%s: pty alloc failed", __func__);
1.103 ! markus 569: sshbuf_free(m);
1.1 provos 570: return (0);
571: }
1.103 ! markus 572: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
! 573: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
! 574: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 575: sshbuf_free(m);
1.1 provos 576:
577: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 578: free(p);
1.39 dtucker 579:
1.102 markus 580: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
581: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 582: free(msg);
1.1 provos 583:
1.58 djm 584: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
585: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
586: fatal("%s: receive fds failed", __func__);
1.1 provos 587:
588: /* Success */
589: return (1);
590: }
591:
592: void
1.32 markus 593: mm_session_pty_cleanup2(Session *s)
1.1 provos 594: {
1.103 ! markus 595: struct sshbuf *m;
! 596: int r;
1.1 provos 597:
598: if (s->ttyfd == -1)
599: return;
1.103 ! markus 600: if ((m = sshbuf_new()) == NULL)
! 601: fatal("%s: sshbuf_new failed", __func__);
! 602: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
! 603: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 604: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
! 605: sshbuf_free(m);
1.3 markus 606:
1.1 provos 607: /* closed dup'ed master */
1.62 djm 608: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
609: error("close(s->ptymaster/%d): %s",
610: s->ptymaster, strerror(errno));
1.1 provos 611:
612: /* unlink pty from session */
613: s->ttyfd = -1;
614: }
615:
616: /* Request process termination */
617:
618: void
619: mm_terminate(void)
620: {
1.103 ! markus 621: struct sshbuf *m;
1.1 provos 622:
1.103 ! markus 623: if ((m = sshbuf_new()) == NULL)
! 624: fatal("%s: sshbuf_new failed", __func__);
! 625: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
! 626: sshbuf_free(m);
1.1 provos 627: }
628:
1.2 markus 629: static void
1.1 provos 630: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
631: char ***prompts, u_int **echo_on)
632: {
1.10 deraadt 633: *name = xstrdup("");
634: *infotxt = xstrdup("");
1.1 provos 635: *numprompts = 1;
1.43 djm 636: *prompts = xcalloc(*numprompts, sizeof(char *));
637: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 638: (*echo_on)[0] = 0;
639: }
640:
641: int
642: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
643: u_int *numprompts, char ***prompts, u_int **echo_on)
644: {
1.103 ! markus 645: struct sshbuf *m;
1.21 markus 646: u_int success;
1.1 provos 647: char *challenge;
1.103 ! markus 648: int r;
1.1 provos 649:
1.8 markus 650: debug3("%s: entering", __func__);
1.1 provos 651:
1.103 ! markus 652: if ((m = sshbuf_new()) == NULL)
! 653: fatal("%s: sshbuf_new failed", __func__);
! 654: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 655:
1.103 ! markus 656: mm_request_receive_expect(pmonitor->m_recvfd,
! 657: MONITOR_ANS_BSDAUTHQUERY, m);
! 658: if ((r = sshbuf_get_u32(m, &success)) != 0)
! 659: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 660: if (success == 0) {
1.8 markus 661: debug3("%s: no challenge", __func__);
1.103 ! markus 662: sshbuf_free(m);
1.1 provos 663: return (-1);
664: }
665:
666: /* Get the challenge, and format the response */
1.103 ! markus 667: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
! 668: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 669: sshbuf_free(m);
1.1 provos 670:
671: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
672: (*prompts)[0] = challenge;
673:
1.8 markus 674: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 675:
676: return (0);
677: }
678:
679: int
680: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
681: {
1.103 ! markus 682: struct sshbuf *m;
! 683: int r, authok;
1.1 provos 684:
1.8 markus 685: debug3("%s: entering", __func__);
1.1 provos 686: if (numresponses != 1)
687: return (-1);
688:
1.103 ! markus 689: if ((m = sshbuf_new()) == NULL)
! 690: fatal("%s: sshbuf_new failed", __func__);
! 691: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
! 692: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 693: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 694:
1.7 mouring 695: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 ! markus 696: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 697:
1.103 ! markus 698: if ((r = sshbuf_get_u32(m, &authok)) != 0)
! 699: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 700: sshbuf_free(m);
1.1 provos 701:
702: return ((authok == 0) ? -1 : 0);
703: }
1.29 markus 704:
705: #ifdef GSSAPI
706: OM_uint32
1.36 avsm 707: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 708: {
1.103 ! markus 709: struct sshbuf *m;
1.29 markus 710: OM_uint32 major;
1.103 ! markus 711: int r;
1.29 markus 712:
713: /* Client doesn't get to see the context */
714: *ctx = NULL;
715:
1.103 ! markus 716: if ((m = sshbuf_new()) == NULL)
! 717: fatal("%s: sshbuf_new failed", __func__);
! 718: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
! 719: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 720:
1.103 ! markus 721: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
! 722: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 723:
1.103 ! markus 724: if ((r = sshbuf_get_u32(m, &major)) != 0)
! 725: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 726:
1.103 ! markus 727: sshbuf_free(m);
1.29 markus 728: return (major);
729: }
730:
731: OM_uint32
732: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 ! markus 733: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 734: {
1.103 ! markus 735: struct sshbuf *m;
1.29 markus 736: OM_uint32 major;
1.103 ! markus 737: u_int flags;
! 738: int r;
1.29 markus 739:
1.103 ! markus 740: if ((m = sshbuf_new()) == NULL)
! 741: fatal("%s: sshbuf_new failed", __func__);
! 742: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
! 743: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 744:
1.103 ! markus 745: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
! 746: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 747:
1.103 ! markus 748: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
! 749: (r = sshbuf_get_string(m, &out->value, &out->length)) != 0)
! 750: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 751: if (flagsp != NULL) {
! 752: if ((r = sshbuf_get_u32(m, &flags)) != 0)
! 753: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 754: *flagsp = flags;
! 755: }
1.29 markus 756:
1.103 ! markus 757: sshbuf_free(m);
1.29 markus 758:
759: return (major);
1.35 markus 760: }
761:
762: OM_uint32
763: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
764: {
1.103 ! markus 765: struct sshbuf *m;
1.35 markus 766: OM_uint32 major;
1.103 ! markus 767: int r;
! 768:
! 769: if ((m = sshbuf_new()) == NULL)
! 770: fatal("%s: sshbuf_new failed", __func__);
! 771: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
! 772: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
! 773: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 774:
1.103 ! markus 775: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
! 776: mm_request_receive_expect(pmonitor->m_recvfd,
! 777: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 778:
1.103 ! markus 779: if ((r = sshbuf_get_u32(m, &major)) != 0)
! 780: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 781: sshbuf_free(m);
1.35 markus 782: return(major);
1.29 markus 783: }
784:
785: int
786: mm_ssh_gssapi_userok(char *user)
787: {
1.103 ! markus 788: struct sshbuf *m;
! 789: int r, authenticated = 0;
1.29 markus 790:
1.103 ! markus 791: if ((m = sshbuf_new()) == NULL)
! 792: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 793:
1.103 ! markus 794: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
! 795: mm_request_receive_expect(pmonitor->m_recvfd,
! 796: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 797:
1.103 ! markus 798: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
! 799: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 800:
1.103 ! markus 801: sshbuf_free(m);
1.29 markus 802: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
803: return (authenticated);
804: }
805: #endif /* GSSAPI */
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