Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.108
1.108 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.107 2018/07/20 03:46:34 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"
1.106 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"
59: #include "monitor.h"
1.50 deraadt 60: #ifdef GSSAPI
61: #include "ssh-gss.h"
62: #endif
1.1 provos 63: #include "monitor_wrap.h"
64: #include "atomicio.h"
65: #include "monitor_fdpass.h"
1.45 djm 66: #include "misc.h"
1.1 provos 67:
68: #include "channels.h"
69: #include "session.h"
1.55 dtucker 70: #include "servconf.h"
1.29 markus 71:
1.82 markus 72: #include "ssherr.h"
1.108 ! djm 73:
! 74: #include "opacket.h" /* XXX */
! 75: extern struct ssh *active_state; /* XXX */
1.82 markus 76:
1.1 provos 77: /* Imports */
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
1.106 markus 219: mm_sshkey_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
220: const u_char *data, size_t datalen, const char *hostkey_alg, u_int compat)
1.1 provos 221: {
1.83 markus 222: struct kex *kex = *pmonitor->m_pkex;
1.103 markus 223: struct sshbuf *m;
224: u_int ndx = kex->host_key_index(key, 0, active_state);
225: int r;
1.1 provos 226:
1.8 markus 227: debug3("%s entering", __func__);
1.1 provos 228:
1.103 markus 229: if ((m = sshbuf_new()) == NULL)
230: fatal("%s: sshbuf_new failed", __func__);
231: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
232: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
1.106 markus 233: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
234: (r = sshbuf_put_u32(m, compat)) != 0)
1.103 markus 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);
1.106 markus 241: if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
1.103 markus 242: fatal("%s: buffer error: %s", __func__, ssh_err(r));
243: sshbuf_free(m);
1.1 provos 244:
245: return (0);
246: }
247:
248: struct passwd *
1.37 dtucker 249: mm_getpwnamallow(const char *username)
1.1 provos 250: {
1.93 djm 251: struct ssh *ssh = active_state; /* XXX */
1.103 markus 252: struct sshbuf *m;
1.1 provos 253: struct passwd *pw;
1.103 markus 254: size_t len;
255: u_int i;
1.55 dtucker 256: ServerOptions *newopts;
1.103 markus 257: int r;
258: u_char ok;
259: const u_char *p;
1.1 provos 260:
1.8 markus 261: debug3("%s entering", __func__);
1.1 provos 262:
1.103 markus 263: if ((m = sshbuf_new()) == NULL)
264: fatal("%s: sshbuf_new failed", __func__);
265: if ((r = sshbuf_put_cstring(m, username)) != 0)
266: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 267:
1.103 markus 268: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 269:
1.8 markus 270: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 271: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 272:
1.103 markus 273: if ((r = sshbuf_get_u8(m, &ok)) != 0)
274: fatal("%s: buffer error: %s", __func__, ssh_err(r));
275: if (ok == 0) {
1.60 dtucker 276: pw = NULL;
277: goto out;
1.1 provos 278: }
1.103 markus 279:
280: /* XXX don't like passing struct passwd like this */
281: pw = xcalloc(sizeof(*pw), 1);
282: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
283: fatal("%s: buffer error: %s", __func__, ssh_err(r));
284: if (len != sizeof(*pw))
1.8 markus 285: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 286: memcpy(pw, p, sizeof(*pw));
287:
288: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
289: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
290: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
291: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
292: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
293: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
294: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 295:
1.60 dtucker 296: out:
1.55 dtucker 297: /* copy options block as a Match directive may have changed some */
1.103 markus 298: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
299: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 300: if (len != sizeof(*newopts))
301: fatal("%s: option block size mismatch", __func__);
1.103 markus 302: newopts = xcalloc(sizeof(*newopts), 1);
303: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 304:
305: #define M_CP_STROPT(x) do { \
1.103 markus 306: if (newopts->x != NULL) { \
307: if ((r = sshbuf_get_cstring(m, \
308: &newopts->x, NULL)) != 0) \
309: fatal("%s: buffer error: %s", \
310: __func__, ssh_err(r)); \
311: } \
1.71 djm 312: } while (0)
1.72 djm 313: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 314: newopts->x = newopts->nx == 0 ? \
315: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 316: for (i = 0; i < newopts->nx; i++) { \
317: if ((r = sshbuf_get_cstring(m, \
318: &newopts->x[i], NULL)) != 0) \
319: fatal("%s: buffer error: %s", \
320: __func__, ssh_err(r)); \
321: } \
1.72 djm 322: } while (0)
1.71 djm 323: /* See comment in servconf.h */
324: COPY_MATCH_STRING_OPTS();
325: #undef M_CP_STROPT
1.72 djm 326: #undef M_CP_STRARRAYOPT
1.71 djm 327:
1.55 dtucker 328: copy_set_server_options(&options, newopts, 1);
1.90 djm 329: log_change_level(options.log_level);
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
1.88 djm 425: mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host,
1.91 markus 426: 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,
1.96 djm 485: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
1.1 provos 486: {
1.103 markus 487: struct sshbuf *m;
1.92 markus 488: u_int encoded_ret = 0;
1.103 markus 489: int r;
1.1 provos 490:
1.8 markus 491: debug3("%s entering", __func__);
1.1 provos 492:
493:
1.103 markus 494: if ((m = sshbuf_new()) == NULL)
495: fatal("%s: sshbuf_new failed", __func__);
496: if ((r = sshkey_puts(key, m)) != 0 ||
497: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
498: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
499: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
500: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 501:
1.103 markus 502: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 503:
1.8 markus 504: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 505: mm_request_receive_expect(pmonitor->m_recvfd,
506: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 507:
1.103 markus 508: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0)
509: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 510:
1.103 markus 511: sshbuf_free(m);
1.1 provos 512:
1.92 markus 513: if (encoded_ret != 0)
514: return SSH_ERR_SIGNATURE_INVALID;
515: return 0;
1.1 provos 516: }
517:
518: void
1.36 avsm 519: mm_send_keystate(struct monitor *monitor)
1.1 provos 520: {
1.82 markus 521: struct ssh *ssh = active_state; /* XXX */
522: struct sshbuf *m;
523: int r;
524:
525: if ((m = sshbuf_new()) == NULL)
526: fatal("%s: sshbuf_new failed", __func__);
527: if ((r = ssh_packet_get_state(ssh, m)) != 0)
528: fatal("%s: get_state failed: %s",
529: __func__, ssh_err(r));
530: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 531: debug3("%s: Finished sending state", __func__);
1.82 markus 532: sshbuf_free(m);
1.1 provos 533: }
534:
535: int
1.42 deraadt 536: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 537: {
1.103 markus 538: struct sshbuf *m;
1.39 dtucker 539: char *p, *msg;
1.102 markus 540: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 541:
542: /* Kludge: ensure there are fds free to receive the pty/tty */
543: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
544: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
545: error("%s: cannot allocate fds for pty", __func__);
546: if (tmp1 > 0)
547: close(tmp1);
548: if (tmp2 > 0)
549: close(tmp2);
550: return 0;
551: }
552: close(tmp1);
553: close(tmp2);
1.1 provos 554:
1.103 markus 555: if ((m = sshbuf_new()) == NULL)
556: fatal("%s: sshbuf_new failed", __func__);
557: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 558:
1.8 markus 559: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 560: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 561:
1.103 markus 562: if ((r = sshbuf_get_u32(m, &success)) != 0)
563: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 564: if (success == 0) {
1.8 markus 565: debug3("%s: pty alloc failed", __func__);
1.103 markus 566: sshbuf_free(m);
1.1 provos 567: return (0);
568: }
1.103 markus 569: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
570: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
571: fatal("%s: buffer error: %s", __func__, ssh_err(r));
572: sshbuf_free(m);
1.1 provos 573:
574: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 575: free(p);
1.39 dtucker 576:
1.102 markus 577: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
578: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 579: free(msg);
1.1 provos 580:
1.58 djm 581: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
582: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
583: fatal("%s: receive fds failed", __func__);
1.1 provos 584:
585: /* Success */
586: return (1);
587: }
588:
589: void
1.32 markus 590: mm_session_pty_cleanup2(Session *s)
1.1 provos 591: {
1.103 markus 592: struct sshbuf *m;
593: int r;
1.1 provos 594:
595: if (s->ttyfd == -1)
596: return;
1.103 markus 597: if ((m = sshbuf_new()) == NULL)
598: fatal("%s: sshbuf_new failed", __func__);
599: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
600: fatal("%s: buffer error: %s", __func__, ssh_err(r));
601: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
602: sshbuf_free(m);
1.3 markus 603:
1.1 provos 604: /* closed dup'ed master */
1.62 djm 605: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
606: error("close(s->ptymaster/%d): %s",
607: s->ptymaster, strerror(errno));
1.1 provos 608:
609: /* unlink pty from session */
610: s->ttyfd = -1;
611: }
612:
613: /* Request process termination */
614:
615: void
616: mm_terminate(void)
617: {
1.103 markus 618: struct sshbuf *m;
1.1 provos 619:
1.103 markus 620: if ((m = sshbuf_new()) == NULL)
621: fatal("%s: sshbuf_new failed", __func__);
622: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
623: sshbuf_free(m);
1.1 provos 624: }
625:
1.2 markus 626: static void
1.1 provos 627: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
628: char ***prompts, u_int **echo_on)
629: {
1.10 deraadt 630: *name = xstrdup("");
631: *infotxt = xstrdup("");
1.1 provos 632: *numprompts = 1;
1.43 djm 633: *prompts = xcalloc(*numprompts, sizeof(char *));
634: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 635: (*echo_on)[0] = 0;
636: }
637:
638: int
639: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
640: u_int *numprompts, char ***prompts, u_int **echo_on)
641: {
1.103 markus 642: struct sshbuf *m;
1.21 markus 643: u_int success;
1.1 provos 644: char *challenge;
1.103 markus 645: int r;
1.1 provos 646:
1.8 markus 647: debug3("%s: entering", __func__);
1.1 provos 648:
1.103 markus 649: if ((m = sshbuf_new()) == NULL)
650: fatal("%s: sshbuf_new failed", __func__);
651: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 652:
1.103 markus 653: mm_request_receive_expect(pmonitor->m_recvfd,
654: MONITOR_ANS_BSDAUTHQUERY, m);
655: if ((r = sshbuf_get_u32(m, &success)) != 0)
656: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 657: if (success == 0) {
1.8 markus 658: debug3("%s: no challenge", __func__);
1.103 markus 659: sshbuf_free(m);
1.1 provos 660: return (-1);
661: }
662:
663: /* Get the challenge, and format the response */
1.103 markus 664: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
665: fatal("%s: buffer error: %s", __func__, ssh_err(r));
666: sshbuf_free(m);
1.1 provos 667:
668: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
669: (*prompts)[0] = challenge;
670:
1.8 markus 671: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 672:
673: return (0);
674: }
675:
676: int
677: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
678: {
1.103 markus 679: struct sshbuf *m;
680: int r, authok;
1.1 provos 681:
1.8 markus 682: debug3("%s: entering", __func__);
1.1 provos 683: if (numresponses != 1)
684: return (-1);
685:
1.103 markus 686: if ((m = sshbuf_new()) == NULL)
687: fatal("%s: sshbuf_new failed", __func__);
688: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
689: fatal("%s: buffer error: %s", __func__, ssh_err(r));
690: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 691:
1.7 mouring 692: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 693: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 694:
1.103 markus 695: if ((r = sshbuf_get_u32(m, &authok)) != 0)
696: fatal("%s: buffer error: %s", __func__, ssh_err(r));
697: sshbuf_free(m);
1.1 provos 698:
699: return ((authok == 0) ? -1 : 0);
700: }
1.29 markus 701:
702: #ifdef GSSAPI
703: OM_uint32
1.36 avsm 704: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 705: {
1.103 markus 706: struct sshbuf *m;
1.29 markus 707: OM_uint32 major;
1.103 markus 708: int r;
1.29 markus 709:
710: /* Client doesn't get to see the context */
711: *ctx = NULL;
712:
1.103 markus 713: if ((m = sshbuf_new()) == NULL)
714: fatal("%s: sshbuf_new failed", __func__);
715: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
716: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 717:
1.103 markus 718: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
719: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 720:
1.103 markus 721: if ((r = sshbuf_get_u32(m, &major)) != 0)
722: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 723:
1.103 markus 724: sshbuf_free(m);
1.29 markus 725: return (major);
726: }
727:
728: OM_uint32
729: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 730: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 731: {
1.103 markus 732: struct sshbuf *m;
1.29 markus 733: OM_uint32 major;
1.103 markus 734: u_int flags;
735: int r;
1.29 markus 736:
1.103 markus 737: if ((m = sshbuf_new()) == NULL)
738: fatal("%s: sshbuf_new failed", __func__);
739: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
740: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 741:
1.103 markus 742: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
743: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 744:
1.103 markus 745: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 746: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 747: fatal("%s: buffer error: %s", __func__, ssh_err(r));
748: if (flagsp != NULL) {
749: if ((r = sshbuf_get_u32(m, &flags)) != 0)
750: fatal("%s: buffer error: %s", __func__, ssh_err(r));
751: *flagsp = flags;
752: }
1.29 markus 753:
1.103 markus 754: sshbuf_free(m);
1.29 markus 755:
756: return (major);
1.35 markus 757: }
758:
759: OM_uint32
760: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
761: {
1.103 markus 762: struct sshbuf *m;
1.35 markus 763: OM_uint32 major;
1.103 markus 764: int r;
765:
766: if ((m = sshbuf_new()) == NULL)
767: fatal("%s: sshbuf_new failed", __func__);
768: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
769: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
770: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 771:
1.103 markus 772: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
773: mm_request_receive_expect(pmonitor->m_recvfd,
774: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 775:
1.103 markus 776: if ((r = sshbuf_get_u32(m, &major)) != 0)
777: fatal("%s: buffer error: %s", __func__, ssh_err(r));
778: sshbuf_free(m);
1.35 markus 779: return(major);
1.29 markus 780: }
781:
782: int
783: mm_ssh_gssapi_userok(char *user)
784: {
1.103 markus 785: struct sshbuf *m;
786: int r, authenticated = 0;
1.29 markus 787:
1.103 markus 788: if ((m = sshbuf_new()) == NULL)
789: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 790:
1.103 markus 791: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
792: mm_request_receive_expect(pmonitor->m_recvfd,
793: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 794:
1.103 markus 795: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
796: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 797:
1.103 markus 798: sshbuf_free(m);
1.29 markus 799: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
800: return (authenticated);
801: }
802: #endif /* GSSAPI */
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