Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.109
1.109 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.108 2019/01/19 21:31:32 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 *
1.109 ! djm 249: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 250: {
1.103 markus 251: struct sshbuf *m;
1.1 provos 252: struct passwd *pw;
1.103 markus 253: size_t len;
254: u_int i;
1.55 dtucker 255: ServerOptions *newopts;
1.103 markus 256: int r;
257: u_char ok;
258: const u_char *p;
1.1 provos 259:
1.8 markus 260: debug3("%s entering", __func__);
1.1 provos 261:
1.103 markus 262: if ((m = sshbuf_new()) == NULL)
263: fatal("%s: sshbuf_new failed", __func__);
264: if ((r = sshbuf_put_cstring(m, username)) != 0)
265: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 266:
1.103 markus 267: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 268:
1.8 markus 269: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 270: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 271:
1.103 markus 272: if ((r = sshbuf_get_u8(m, &ok)) != 0)
273: fatal("%s: buffer error: %s", __func__, ssh_err(r));
274: if (ok == 0) {
1.60 dtucker 275: pw = NULL;
276: goto out;
1.1 provos 277: }
1.103 markus 278:
279: /* XXX don't like passing struct passwd like this */
280: pw = xcalloc(sizeof(*pw), 1);
281: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
282: fatal("%s: buffer error: %s", __func__, ssh_err(r));
283: if (len != sizeof(*pw))
1.8 markus 284: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 285: memcpy(pw, p, sizeof(*pw));
286:
287: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
288: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
289: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
290: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
291: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
292: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
293: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 294:
1.60 dtucker 295: out:
1.55 dtucker 296: /* copy options block as a Match directive may have changed some */
1.103 markus 297: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
298: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 299: if (len != sizeof(*newopts))
300: fatal("%s: option block size mismatch", __func__);
1.103 markus 301: newopts = xcalloc(sizeof(*newopts), 1);
302: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 303:
304: #define M_CP_STROPT(x) do { \
1.103 markus 305: if (newopts->x != NULL) { \
306: if ((r = sshbuf_get_cstring(m, \
307: &newopts->x, NULL)) != 0) \
308: fatal("%s: buffer error: %s", \
309: __func__, ssh_err(r)); \
310: } \
1.71 djm 311: } while (0)
1.72 djm 312: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 313: newopts->x = newopts->nx == 0 ? \
314: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 315: for (i = 0; i < newopts->nx; i++) { \
316: if ((r = sshbuf_get_cstring(m, \
317: &newopts->x[i], NULL)) != 0) \
318: fatal("%s: buffer error: %s", \
319: __func__, ssh_err(r)); \
320: } \
1.72 djm 321: } while (0)
1.71 djm 322: /* See comment in servconf.h */
323: COPY_MATCH_STRING_OPTS();
324: #undef M_CP_STROPT
1.72 djm 325: #undef M_CP_STRARRAYOPT
1.71 djm 326:
1.55 dtucker 327: copy_set_server_options(&options, newopts, 1);
1.90 djm 328: log_change_level(options.log_level);
1.93 djm 329: process_permitopen(ssh, &options);
1.76 djm 330: free(newopts);
1.55 dtucker 331:
1.103 markus 332: sshbuf_free(m);
1.1 provos 333:
334: return (pw);
1.6 djm 335: }
336:
1.33 markus 337: char *
338: mm_auth2_read_banner(void)
1.6 djm 339: {
1.103 markus 340: struct sshbuf *m;
1.6 djm 341: char *banner;
1.103 markus 342: int r;
1.6 djm 343:
1.8 markus 344: debug3("%s entering", __func__);
1.6 djm 345:
1.103 markus 346: if ((m = sshbuf_new()) == NULL)
347: fatal("%s: sshbuf_new failed", __func__);
348: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
349: sshbuf_reset(m);
1.6 djm 350:
1.33 markus 351: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 352: MONITOR_ANS_AUTH2_READ_BANNER, m);
353: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
354: fatal("%s: buffer error: %s", __func__, ssh_err(r));
355: sshbuf_free(m);
1.10 deraadt 356:
1.33 markus 357: /* treat empty banner as missing banner */
358: if (strlen(banner) == 0) {
1.76 djm 359: free(banner);
1.33 markus 360: banner = NULL;
361: }
1.6 djm 362: return (banner);
1.1 provos 363: }
364:
365: /* Inform the privileged process about service and style */
366:
367: void
368: mm_inform_authserv(char *service, char *style)
369: {
1.103 markus 370: struct sshbuf *m;
371: int r;
1.1 provos 372:
1.8 markus 373: debug3("%s entering", __func__);
1.1 provos 374:
1.103 markus 375: if ((m = sshbuf_new()) == NULL)
376: fatal("%s: sshbuf_new failed", __func__);
377: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
378: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
379: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 380:
1.103 markus 381: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 382:
1.103 markus 383: sshbuf_free(m);
1.1 provos 384: }
385:
386: /* Do the password authentication */
387: int
1.99 djm 388: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 389: {
1.103 markus 390: struct sshbuf *m;
391: int r, authenticated = 0;
1.1 provos 392:
1.8 markus 393: debug3("%s entering", __func__);
1.1 provos 394:
1.103 markus 395: if ((m = sshbuf_new()) == NULL)
396: fatal("%s: sshbuf_new failed", __func__);
397: if ((r = sshbuf_put_cstring(m, password)) != 0)
398: fatal("%s: buffer error: %s", __func__, ssh_err(r));
399: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 400:
1.8 markus 401: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 402: mm_request_receive_expect(pmonitor->m_recvfd,
403: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 404:
1.103 markus 405: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
406: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 407:
1.103 markus 408: sshbuf_free(m);
1.1 provos 409:
1.3 markus 410: debug3("%s: user %sauthenticated",
1.8 markus 411: __func__, authenticated ? "" : "not ");
1.1 provos 412: return (authenticated);
413: }
414:
415: int
1.99 djm 416: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
417: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 418: {
1.85 djm 419: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 420: pubkey_auth_attempt, authoptp));
1.1 provos 421: }
422:
423: int
1.88 djm 424: mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host,
1.91 markus 425: struct sshkey *key)
1.1 provos 426: {
1.99 djm 427: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 428: }
429:
430: int
1.88 djm 431: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 432: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 433: {
1.103 markus 434: struct sshbuf *m;
1.99 djm 435: int r, allowed = 0;
436: struct sshauthopt *opts = NULL;
1.1 provos 437:
1.8 markus 438: debug3("%s entering", __func__);
1.1 provos 439:
1.99 djm 440: if (authoptp != NULL)
441: *authoptp = NULL;
442:
1.103 markus 443: if ((m = sshbuf_new()) == NULL)
444: fatal("%s: sshbuf_new failed", __func__);
445: if ((r = sshbuf_put_u32(m, type)) != 0 ||
446: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
447: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
448: (r = sshkey_puts(key, m)) != 0 ||
449: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
450: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 451:
1.103 markus 452: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 453:
1.8 markus 454: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 455: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 456: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 457:
1.103 markus 458: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
459: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 460: if (allowed && type == MM_USERKEY) {
1.103 markus 461: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 462: fatal("%s: sshauthopt_deserialise: %s",
463: __func__, ssh_err(r));
464: }
1.103 markus 465: sshbuf_free(m);
1.1 provos 466:
1.99 djm 467: if (authoptp != NULL) {
468: *authoptp = opts;
469: opts = NULL;
470: }
471: sshauthopt_free(opts);
1.1 provos 472:
1.99 djm 473: return allowed;
1.1 provos 474: }
475:
1.3 markus 476: /*
1.1 provos 477: * This key verify needs to send the key type along, because the
478: * privileged parent makes the decision if the key is allowed
479: * for authentication.
480: */
481:
482: int
1.92 markus 483: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.96 djm 484: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
1.1 provos 485: {
1.103 markus 486: struct sshbuf *m;
1.92 markus 487: u_int encoded_ret = 0;
1.103 markus 488: int r;
1.1 provos 489:
1.8 markus 490: debug3("%s entering", __func__);
1.1 provos 491:
492:
1.103 markus 493: if ((m = sshbuf_new()) == NULL)
494: fatal("%s: sshbuf_new failed", __func__);
495: if ((r = sshkey_puts(key, m)) != 0 ||
496: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
497: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
498: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
499: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 500:
1.103 markus 501: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 502:
1.8 markus 503: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 504: mm_request_receive_expect(pmonitor->m_recvfd,
505: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 506:
1.103 markus 507: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0)
508: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 509:
1.103 markus 510: sshbuf_free(m);
1.1 provos 511:
1.92 markus 512: if (encoded_ret != 0)
513: return SSH_ERR_SIGNATURE_INVALID;
514: return 0;
1.1 provos 515: }
516:
517: void
1.36 avsm 518: mm_send_keystate(struct monitor *monitor)
1.1 provos 519: {
1.82 markus 520: struct ssh *ssh = active_state; /* XXX */
521: struct sshbuf *m;
522: int r;
523:
524: if ((m = sshbuf_new()) == NULL)
525: fatal("%s: sshbuf_new failed", __func__);
526: if ((r = ssh_packet_get_state(ssh, m)) != 0)
527: fatal("%s: get_state failed: %s",
528: __func__, ssh_err(r));
529: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 530: debug3("%s: Finished sending state", __func__);
1.82 markus 531: sshbuf_free(m);
1.1 provos 532: }
533:
534: int
1.42 deraadt 535: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 536: {
1.103 markus 537: struct sshbuf *m;
1.39 dtucker 538: char *p, *msg;
1.102 markus 539: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 540:
541: /* Kludge: ensure there are fds free to receive the pty/tty */
542: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
543: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
544: error("%s: cannot allocate fds for pty", __func__);
545: if (tmp1 > 0)
546: close(tmp1);
547: if (tmp2 > 0)
548: close(tmp2);
549: return 0;
550: }
551: close(tmp1);
552: close(tmp2);
1.1 provos 553:
1.103 markus 554: if ((m = sshbuf_new()) == NULL)
555: fatal("%s: sshbuf_new failed", __func__);
556: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 557:
1.8 markus 558: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 559: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 560:
1.103 markus 561: if ((r = sshbuf_get_u32(m, &success)) != 0)
562: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 563: if (success == 0) {
1.8 markus 564: debug3("%s: pty alloc failed", __func__);
1.103 markus 565: sshbuf_free(m);
1.1 provos 566: return (0);
567: }
1.103 markus 568: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
569: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
570: fatal("%s: buffer error: %s", __func__, ssh_err(r));
571: sshbuf_free(m);
1.1 provos 572:
573: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 574: free(p);
1.39 dtucker 575:
1.102 markus 576: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
577: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 578: free(msg);
1.1 provos 579:
1.58 djm 580: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
581: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
582: fatal("%s: receive fds failed", __func__);
1.1 provos 583:
584: /* Success */
585: return (1);
586: }
587:
588: void
1.32 markus 589: mm_session_pty_cleanup2(Session *s)
1.1 provos 590: {
1.103 markus 591: struct sshbuf *m;
592: int r;
1.1 provos 593:
594: if (s->ttyfd == -1)
595: return;
1.103 markus 596: if ((m = sshbuf_new()) == NULL)
597: fatal("%s: sshbuf_new failed", __func__);
598: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
599: fatal("%s: buffer error: %s", __func__, ssh_err(r));
600: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
601: sshbuf_free(m);
1.3 markus 602:
1.1 provos 603: /* closed dup'ed master */
1.62 djm 604: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
605: error("close(s->ptymaster/%d): %s",
606: s->ptymaster, strerror(errno));
1.1 provos 607:
608: /* unlink pty from session */
609: s->ttyfd = -1;
610: }
611:
612: /* Request process termination */
613:
614: void
615: mm_terminate(void)
616: {
1.103 markus 617: struct sshbuf *m;
1.1 provos 618:
1.103 markus 619: if ((m = sshbuf_new()) == NULL)
620: fatal("%s: sshbuf_new failed", __func__);
621: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
622: sshbuf_free(m);
1.1 provos 623: }
624:
1.2 markus 625: static void
1.1 provos 626: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
627: char ***prompts, u_int **echo_on)
628: {
1.10 deraadt 629: *name = xstrdup("");
630: *infotxt = xstrdup("");
1.1 provos 631: *numprompts = 1;
1.43 djm 632: *prompts = xcalloc(*numprompts, sizeof(char *));
633: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 634: (*echo_on)[0] = 0;
635: }
636:
637: int
638: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
639: u_int *numprompts, char ***prompts, u_int **echo_on)
640: {
1.103 markus 641: struct sshbuf *m;
1.21 markus 642: u_int success;
1.1 provos 643: char *challenge;
1.103 markus 644: int r;
1.1 provos 645:
1.8 markus 646: debug3("%s: entering", __func__);
1.1 provos 647:
1.103 markus 648: if ((m = sshbuf_new()) == NULL)
649: fatal("%s: sshbuf_new failed", __func__);
650: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 651:
1.103 markus 652: mm_request_receive_expect(pmonitor->m_recvfd,
653: MONITOR_ANS_BSDAUTHQUERY, m);
654: if ((r = sshbuf_get_u32(m, &success)) != 0)
655: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 656: if (success == 0) {
1.8 markus 657: debug3("%s: no challenge", __func__);
1.103 markus 658: sshbuf_free(m);
1.1 provos 659: return (-1);
660: }
661:
662: /* Get the challenge, and format the response */
1.103 markus 663: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
664: fatal("%s: buffer error: %s", __func__, ssh_err(r));
665: sshbuf_free(m);
1.1 provos 666:
667: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
668: (*prompts)[0] = challenge;
669:
1.8 markus 670: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 671:
672: return (0);
673: }
674:
675: int
676: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
677: {
1.103 markus 678: struct sshbuf *m;
679: int r, authok;
1.1 provos 680:
1.8 markus 681: debug3("%s: entering", __func__);
1.1 provos 682: if (numresponses != 1)
683: return (-1);
684:
1.103 markus 685: if ((m = sshbuf_new()) == NULL)
686: fatal("%s: sshbuf_new failed", __func__);
687: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
688: fatal("%s: buffer error: %s", __func__, ssh_err(r));
689: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 690:
1.7 mouring 691: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 692: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 693:
1.103 markus 694: if ((r = sshbuf_get_u32(m, &authok)) != 0)
695: fatal("%s: buffer error: %s", __func__, ssh_err(r));
696: sshbuf_free(m);
1.1 provos 697:
698: return ((authok == 0) ? -1 : 0);
699: }
1.29 markus 700:
701: #ifdef GSSAPI
702: OM_uint32
1.36 avsm 703: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 704: {
1.103 markus 705: struct sshbuf *m;
1.29 markus 706: OM_uint32 major;
1.103 markus 707: int r;
1.29 markus 708:
709: /* Client doesn't get to see the context */
710: *ctx = NULL;
711:
1.103 markus 712: if ((m = sshbuf_new()) == NULL)
713: fatal("%s: sshbuf_new failed", __func__);
714: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
715: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 716:
1.103 markus 717: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
718: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 719:
1.103 markus 720: if ((r = sshbuf_get_u32(m, &major)) != 0)
721: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 722:
1.103 markus 723: sshbuf_free(m);
1.29 markus 724: return (major);
725: }
726:
727: OM_uint32
728: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 729: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 730: {
1.103 markus 731: struct sshbuf *m;
1.29 markus 732: OM_uint32 major;
1.103 markus 733: u_int flags;
734: int r;
1.29 markus 735:
1.103 markus 736: if ((m = sshbuf_new()) == NULL)
737: fatal("%s: sshbuf_new failed", __func__);
738: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
739: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 740:
1.103 markus 741: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
742: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 743:
1.103 markus 744: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 745: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 746: fatal("%s: buffer error: %s", __func__, ssh_err(r));
747: if (flagsp != NULL) {
748: if ((r = sshbuf_get_u32(m, &flags)) != 0)
749: fatal("%s: buffer error: %s", __func__, ssh_err(r));
750: *flagsp = flags;
751: }
1.29 markus 752:
1.103 markus 753: sshbuf_free(m);
1.29 markus 754:
755: return (major);
1.35 markus 756: }
757:
758: OM_uint32
759: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
760: {
1.103 markus 761: struct sshbuf *m;
1.35 markus 762: OM_uint32 major;
1.103 markus 763: int r;
764:
765: if ((m = sshbuf_new()) == NULL)
766: fatal("%s: sshbuf_new failed", __func__);
767: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
768: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
769: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 770:
1.103 markus 771: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
772: mm_request_receive_expect(pmonitor->m_recvfd,
773: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 774:
1.103 markus 775: if ((r = sshbuf_get_u32(m, &major)) != 0)
776: fatal("%s: buffer error: %s", __func__, ssh_err(r));
777: sshbuf_free(m);
1.35 markus 778: return(major);
1.29 markus 779: }
780:
781: int
782: mm_ssh_gssapi_userok(char *user)
783: {
1.103 markus 784: struct sshbuf *m;
785: int r, authenticated = 0;
1.29 markus 786:
1.103 markus 787: if ((m = sshbuf_new()) == NULL)
788: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 789:
1.103 markus 790: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
791: mm_request_receive_expect(pmonitor->m_recvfd,
792: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 793:
1.103 markus 794: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
795: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 796:
1.103 markus 797: sshbuf_free(m);
1.29 markus 798: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
799: return (authenticated);
800: }
801: #endif /* GSSAPI */
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