Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.115
1.115 ! naddy 1: /* $OpenBSD: monitor_wrap.c,v 1.114 2019/10/31 21:23:19 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>
1.115 ! naddy 37: #include <stdarg.h>
1.51 dtucker 38: #include <unistd.h>
1.68 dtucker 39:
1.80 markus 40: #ifdef WITH_OPENSSL
1.68 dtucker 41: #include <openssl/bn.h>
42: #include <openssl/dh.h>
1.80 markus 43: #endif
1.1 provos 44:
1.50 deraadt 45: #include "xmalloc.h"
1.1 provos 46: #include "ssh.h"
1.80 markus 47: #ifdef WITH_OPENSSL
1.1 provos 48: #include "dh.h"
1.80 markus 49: #endif
1.103 markus 50: #include "sshbuf.h"
1.106 markus 51: #include "sshkey.h"
1.50 deraadt 52: #include "cipher.h"
1.1 provos 53: #include "kex.h"
1.50 deraadt 54: #include "hostfile.h"
1.1 provos 55: #include "auth.h"
1.22 markus 56: #include "auth-options.h"
1.1 provos 57: #include "packet.h"
58: #include "mac.h"
59: #include "log.h"
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"
1.108 djm 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:
1.112 djm 201: if ((r = sshbuf_get_bignum2(m, &p)) != 0 ||
202: (r = sshbuf_get_bignum2(m, &g)) != 0)
1.103 markus 203: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 204:
1.103 markus 205: debug3("%s: remaining %zu", __func__, sshbuf_len(m));
206: sshbuf_free(m);
1.1 provos 207:
208: return (dh_new_group(g, p));
209: }
1.80 markus 210: #endif
1.1 provos 211:
212: int
1.111 djm 213: mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.114 djm 214: const u_char *data, size_t datalen, const char *hostkey_alg,
215: const char *sk_provider, u_int compat)
1.1 provos 216: {
1.83 markus 217: struct kex *kex = *pmonitor->m_pkex;
1.103 markus 218: struct sshbuf *m;
1.111 djm 219: u_int ndx = kex->host_key_index(key, 0, ssh);
1.103 markus 220: int r;
1.1 provos 221:
1.8 markus 222: debug3("%s entering", __func__);
1.114 djm 223: if (sk_provider != NULL)
224: fatal("%s: sk_provider != NULL", __func__);
1.103 markus 225: if ((m = sshbuf_new()) == NULL)
226: fatal("%s: sshbuf_new failed", __func__);
227: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
228: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
1.106 markus 229: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
230: (r = sshbuf_put_u32(m, compat)) != 0)
1.103 markus 231: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 232:
1.103 markus 233: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 234:
1.8 markus 235: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.103 markus 236: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
1.106 markus 237: if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
1.103 markus 238: fatal("%s: buffer error: %s", __func__, ssh_err(r));
239: sshbuf_free(m);
1.1 provos 240:
241: return (0);
242: }
243:
244: struct passwd *
1.109 djm 245: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 246: {
1.103 markus 247: struct sshbuf *m;
1.1 provos 248: struct passwd *pw;
1.103 markus 249: size_t len;
250: u_int i;
1.55 dtucker 251: ServerOptions *newopts;
1.103 markus 252: int r;
253: u_char ok;
254: const u_char *p;
1.1 provos 255:
1.8 markus 256: debug3("%s entering", __func__);
1.1 provos 257:
1.103 markus 258: if ((m = sshbuf_new()) == NULL)
259: fatal("%s: sshbuf_new failed", __func__);
260: if ((r = sshbuf_put_cstring(m, username)) != 0)
261: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 262:
1.103 markus 263: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 264:
1.8 markus 265: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 266: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 267:
1.103 markus 268: if ((r = sshbuf_get_u8(m, &ok)) != 0)
269: fatal("%s: buffer error: %s", __func__, ssh_err(r));
270: if (ok == 0) {
1.60 dtucker 271: pw = NULL;
272: goto out;
1.1 provos 273: }
1.103 markus 274:
275: /* XXX don't like passing struct passwd like this */
276: pw = xcalloc(sizeof(*pw), 1);
277: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
278: fatal("%s: buffer error: %s", __func__, ssh_err(r));
279: if (len != sizeof(*pw))
1.8 markus 280: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 281: memcpy(pw, p, sizeof(*pw));
282:
283: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
284: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
285: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
286: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
287: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
288: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
289: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 290:
1.60 dtucker 291: out:
1.55 dtucker 292: /* copy options block as a Match directive may have changed some */
1.103 markus 293: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
294: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 295: if (len != sizeof(*newopts))
296: fatal("%s: option block size mismatch", __func__);
1.103 markus 297: newopts = xcalloc(sizeof(*newopts), 1);
298: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 299:
300: #define M_CP_STROPT(x) do { \
1.103 markus 301: if (newopts->x != NULL) { \
302: if ((r = sshbuf_get_cstring(m, \
303: &newopts->x, NULL)) != 0) \
304: fatal("%s: buffer error: %s", \
305: __func__, ssh_err(r)); \
306: } \
1.71 djm 307: } while (0)
1.72 djm 308: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 309: newopts->x = newopts->nx == 0 ? \
310: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 311: for (i = 0; i < newopts->nx; i++) { \
312: if ((r = sshbuf_get_cstring(m, \
313: &newopts->x[i], NULL)) != 0) \
314: fatal("%s: buffer error: %s", \
315: __func__, ssh_err(r)); \
316: } \
1.72 djm 317: } while (0)
1.71 djm 318: /* See comment in servconf.h */
319: COPY_MATCH_STRING_OPTS();
320: #undef M_CP_STROPT
1.72 djm 321: #undef M_CP_STRARRAYOPT
1.71 djm 322:
1.55 dtucker 323: copy_set_server_options(&options, newopts, 1);
1.90 djm 324: log_change_level(options.log_level);
1.93 djm 325: process_permitopen(ssh, &options);
1.76 djm 326: free(newopts);
1.55 dtucker 327:
1.103 markus 328: sshbuf_free(m);
1.1 provos 329:
330: return (pw);
1.6 djm 331: }
332:
1.33 markus 333: char *
334: mm_auth2_read_banner(void)
1.6 djm 335: {
1.103 markus 336: struct sshbuf *m;
1.6 djm 337: char *banner;
1.103 markus 338: int r;
1.6 djm 339:
1.8 markus 340: debug3("%s entering", __func__);
1.6 djm 341:
1.103 markus 342: if ((m = sshbuf_new()) == NULL)
343: fatal("%s: sshbuf_new failed", __func__);
344: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
345: sshbuf_reset(m);
1.6 djm 346:
1.33 markus 347: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 348: MONITOR_ANS_AUTH2_READ_BANNER, m);
349: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
350: fatal("%s: buffer error: %s", __func__, ssh_err(r));
351: sshbuf_free(m);
1.10 deraadt 352:
1.33 markus 353: /* treat empty banner as missing banner */
354: if (strlen(banner) == 0) {
1.76 djm 355: free(banner);
1.33 markus 356: banner = NULL;
357: }
1.6 djm 358: return (banner);
1.1 provos 359: }
360:
361: /* Inform the privileged process about service and style */
362:
363: void
364: mm_inform_authserv(char *service, char *style)
365: {
1.103 markus 366: struct sshbuf *m;
367: int r;
1.1 provos 368:
1.8 markus 369: debug3("%s entering", __func__);
1.1 provos 370:
1.103 markus 371: if ((m = sshbuf_new()) == NULL)
372: fatal("%s: sshbuf_new failed", __func__);
373: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
374: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
375: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 376:
1.103 markus 377: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 378:
1.103 markus 379: sshbuf_free(m);
1.1 provos 380: }
381:
382: /* Do the password authentication */
383: int
1.99 djm 384: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 385: {
1.103 markus 386: struct sshbuf *m;
387: int r, authenticated = 0;
1.1 provos 388:
1.8 markus 389: debug3("%s entering", __func__);
1.1 provos 390:
1.103 markus 391: if ((m = sshbuf_new()) == NULL)
392: fatal("%s: sshbuf_new failed", __func__);
393: if ((r = sshbuf_put_cstring(m, password)) != 0)
394: fatal("%s: buffer error: %s", __func__, ssh_err(r));
395: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 396:
1.8 markus 397: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 398: mm_request_receive_expect(pmonitor->m_recvfd,
399: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 400:
1.103 markus 401: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
402: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 403:
1.103 markus 404: sshbuf_free(m);
1.1 provos 405:
1.3 markus 406: debug3("%s: user %sauthenticated",
1.8 markus 407: __func__, authenticated ? "" : "not ");
1.1 provos 408: return (authenticated);
409: }
410:
411: int
1.99 djm 412: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
413: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 414: {
1.85 djm 415: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 416: pubkey_auth_attempt, authoptp));
1.1 provos 417: }
418:
419: int
1.111 djm 420: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
421: const char *user, const char *host, struct sshkey *key)
1.1 provos 422: {
1.99 djm 423: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 424: }
425:
426: int
1.88 djm 427: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 428: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 429: {
1.103 markus 430: struct sshbuf *m;
1.99 djm 431: int r, allowed = 0;
432: struct sshauthopt *opts = NULL;
1.1 provos 433:
1.8 markus 434: debug3("%s entering", __func__);
1.1 provos 435:
1.99 djm 436: if (authoptp != NULL)
437: *authoptp = NULL;
438:
1.103 markus 439: if ((m = sshbuf_new()) == NULL)
440: fatal("%s: sshbuf_new failed", __func__);
441: if ((r = sshbuf_put_u32(m, type)) != 0 ||
442: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
443: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
444: (r = sshkey_puts(key, m)) != 0 ||
445: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
446: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 447:
1.103 markus 448: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 449:
1.8 markus 450: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 451: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 452: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 453:
1.103 markus 454: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
455: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 456: if (allowed && type == MM_USERKEY) {
1.103 markus 457: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 458: fatal("%s: sshauthopt_deserialise: %s",
459: __func__, ssh_err(r));
460: }
1.103 markus 461: sshbuf_free(m);
1.1 provos 462:
1.99 djm 463: if (authoptp != NULL) {
464: *authoptp = opts;
465: opts = NULL;
466: }
467: sshauthopt_free(opts);
1.1 provos 468:
1.99 djm 469: return allowed;
1.1 provos 470: }
471:
1.3 markus 472: /*
1.1 provos 473: * This key verify needs to send the key type along, because the
474: * privileged parent makes the decision if the key is allowed
475: * for authentication.
476: */
477:
478: int
1.92 markus 479: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.96 djm 480: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
1.1 provos 481: {
1.103 markus 482: struct sshbuf *m;
1.92 markus 483: u_int encoded_ret = 0;
1.103 markus 484: int r;
1.1 provos 485:
1.8 markus 486: debug3("%s entering", __func__);
1.1 provos 487:
488:
1.103 markus 489: if ((m = sshbuf_new()) == NULL)
490: fatal("%s: sshbuf_new failed", __func__);
491: if ((r = sshkey_puts(key, m)) != 0 ||
492: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
493: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
494: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
495: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 496:
1.103 markus 497: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 498:
1.8 markus 499: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 500: mm_request_receive_expect(pmonitor->m_recvfd,
501: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 502:
1.103 markus 503: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0)
504: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 505:
1.103 markus 506: sshbuf_free(m);
1.1 provos 507:
1.92 markus 508: if (encoded_ret != 0)
509: return SSH_ERR_SIGNATURE_INVALID;
510: return 0;
1.1 provos 511: }
512:
513: void
1.111 djm 514: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 515: {
1.82 markus 516: struct sshbuf *m;
517: int r;
518:
519: if ((m = sshbuf_new()) == NULL)
520: fatal("%s: sshbuf_new failed", __func__);
521: if ((r = ssh_packet_get_state(ssh, m)) != 0)
522: fatal("%s: get_state failed: %s",
523: __func__, ssh_err(r));
524: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 525: debug3("%s: Finished sending state", __func__);
1.82 markus 526: sshbuf_free(m);
1.1 provos 527: }
528:
529: int
1.42 deraadt 530: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 531: {
1.103 markus 532: struct sshbuf *m;
1.39 dtucker 533: char *p, *msg;
1.102 markus 534: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 535:
536: /* Kludge: ensure there are fds free to receive the pty/tty */
537: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
538: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
539: error("%s: cannot allocate fds for pty", __func__);
540: if (tmp1 > 0)
541: close(tmp1);
542: if (tmp2 > 0)
543: close(tmp2);
544: return 0;
545: }
546: close(tmp1);
547: close(tmp2);
1.1 provos 548:
1.103 markus 549: if ((m = sshbuf_new()) == NULL)
550: fatal("%s: sshbuf_new failed", __func__);
551: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 552:
1.8 markus 553: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 554: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 555:
1.103 markus 556: if ((r = sshbuf_get_u32(m, &success)) != 0)
557: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 558: if (success == 0) {
1.8 markus 559: debug3("%s: pty alloc failed", __func__);
1.103 markus 560: sshbuf_free(m);
1.1 provos 561: return (0);
562: }
1.103 markus 563: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
564: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
565: fatal("%s: buffer error: %s", __func__, ssh_err(r));
566: sshbuf_free(m);
1.1 provos 567:
568: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 569: free(p);
1.39 dtucker 570:
1.102 markus 571: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
572: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 573: free(msg);
1.1 provos 574:
1.58 djm 575: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
576: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
577: fatal("%s: receive fds failed", __func__);
1.1 provos 578:
579: /* Success */
580: return (1);
581: }
582:
583: void
1.32 markus 584: mm_session_pty_cleanup2(Session *s)
1.1 provos 585: {
1.103 markus 586: struct sshbuf *m;
587: int r;
1.1 provos 588:
589: if (s->ttyfd == -1)
590: return;
1.103 markus 591: if ((m = sshbuf_new()) == NULL)
592: fatal("%s: sshbuf_new failed", __func__);
593: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
594: fatal("%s: buffer error: %s", __func__, ssh_err(r));
595: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
596: sshbuf_free(m);
1.3 markus 597:
1.1 provos 598: /* closed dup'ed master */
1.113 deraadt 599: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.62 djm 600: error("close(s->ptymaster/%d): %s",
601: s->ptymaster, strerror(errno));
1.1 provos 602:
603: /* unlink pty from session */
604: s->ttyfd = -1;
605: }
606:
607: /* Request process termination */
608:
609: void
610: mm_terminate(void)
611: {
1.103 markus 612: struct sshbuf *m;
1.1 provos 613:
1.103 markus 614: if ((m = sshbuf_new()) == NULL)
615: fatal("%s: sshbuf_new failed", __func__);
616: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
617: sshbuf_free(m);
1.1 provos 618: }
619:
1.2 markus 620: static void
1.1 provos 621: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
622: char ***prompts, u_int **echo_on)
623: {
1.10 deraadt 624: *name = xstrdup("");
625: *infotxt = xstrdup("");
1.1 provos 626: *numprompts = 1;
1.43 djm 627: *prompts = xcalloc(*numprompts, sizeof(char *));
628: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 629: (*echo_on)[0] = 0;
630: }
631:
632: int
633: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
634: u_int *numprompts, char ***prompts, u_int **echo_on)
635: {
1.103 markus 636: struct sshbuf *m;
1.21 markus 637: u_int success;
1.1 provos 638: char *challenge;
1.103 markus 639: int r;
1.1 provos 640:
1.8 markus 641: debug3("%s: entering", __func__);
1.1 provos 642:
1.103 markus 643: if ((m = sshbuf_new()) == NULL)
644: fatal("%s: sshbuf_new failed", __func__);
645: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 646:
1.103 markus 647: mm_request_receive_expect(pmonitor->m_recvfd,
648: MONITOR_ANS_BSDAUTHQUERY, m);
649: if ((r = sshbuf_get_u32(m, &success)) != 0)
650: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 651: if (success == 0) {
1.8 markus 652: debug3("%s: no challenge", __func__);
1.103 markus 653: sshbuf_free(m);
1.1 provos 654: return (-1);
655: }
656:
657: /* Get the challenge, and format the response */
1.103 markus 658: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
659: fatal("%s: buffer error: %s", __func__, ssh_err(r));
660: sshbuf_free(m);
1.1 provos 661:
662: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
663: (*prompts)[0] = challenge;
664:
1.8 markus 665: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 666:
667: return (0);
668: }
669:
670: int
671: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
672: {
1.103 markus 673: struct sshbuf *m;
674: int r, authok;
1.1 provos 675:
1.8 markus 676: debug3("%s: entering", __func__);
1.1 provos 677: if (numresponses != 1)
678: return (-1);
679:
1.103 markus 680: if ((m = sshbuf_new()) == NULL)
681: fatal("%s: sshbuf_new failed", __func__);
682: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
683: fatal("%s: buffer error: %s", __func__, ssh_err(r));
684: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 685:
1.7 mouring 686: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 687: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 688:
1.103 markus 689: if ((r = sshbuf_get_u32(m, &authok)) != 0)
690: fatal("%s: buffer error: %s", __func__, ssh_err(r));
691: sshbuf_free(m);
1.1 provos 692:
693: return ((authok == 0) ? -1 : 0);
694: }
1.29 markus 695:
696: #ifdef GSSAPI
697: OM_uint32
1.36 avsm 698: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 699: {
1.103 markus 700: struct sshbuf *m;
1.29 markus 701: OM_uint32 major;
1.103 markus 702: int r;
1.29 markus 703:
704: /* Client doesn't get to see the context */
705: *ctx = NULL;
706:
1.103 markus 707: if ((m = sshbuf_new()) == NULL)
708: fatal("%s: sshbuf_new failed", __func__);
709: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
710: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 711:
1.103 markus 712: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
713: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 714:
1.103 markus 715: if ((r = sshbuf_get_u32(m, &major)) != 0)
716: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 717:
1.103 markus 718: sshbuf_free(m);
1.29 markus 719: return (major);
720: }
721:
722: OM_uint32
723: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 724: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 725: {
1.103 markus 726: struct sshbuf *m;
1.29 markus 727: OM_uint32 major;
1.103 markus 728: u_int flags;
729: int r;
1.29 markus 730:
1.103 markus 731: if ((m = sshbuf_new()) == NULL)
732: fatal("%s: sshbuf_new failed", __func__);
733: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
734: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 735:
1.103 markus 736: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
737: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 738:
1.103 markus 739: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 740: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 741: fatal("%s: buffer error: %s", __func__, ssh_err(r));
742: if (flagsp != NULL) {
743: if ((r = sshbuf_get_u32(m, &flags)) != 0)
744: fatal("%s: buffer error: %s", __func__, ssh_err(r));
745: *flagsp = flags;
746: }
1.29 markus 747:
1.103 markus 748: sshbuf_free(m);
1.29 markus 749:
750: return (major);
1.35 markus 751: }
752:
753: OM_uint32
754: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
755: {
1.103 markus 756: struct sshbuf *m;
1.35 markus 757: OM_uint32 major;
1.103 markus 758: int r;
759:
760: if ((m = sshbuf_new()) == NULL)
761: fatal("%s: sshbuf_new failed", __func__);
762: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
763: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
764: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 765:
1.103 markus 766: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
767: mm_request_receive_expect(pmonitor->m_recvfd,
768: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 769:
1.103 markus 770: if ((r = sshbuf_get_u32(m, &major)) != 0)
771: fatal("%s: buffer error: %s", __func__, ssh_err(r));
772: sshbuf_free(m);
1.35 markus 773: return(major);
1.29 markus 774: }
775:
776: int
777: mm_ssh_gssapi_userok(char *user)
778: {
1.103 markus 779: struct sshbuf *m;
780: int r, authenticated = 0;
1.29 markus 781:
1.103 markus 782: if ((m = sshbuf_new()) == NULL)
783: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 784:
1.103 markus 785: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
786: mm_request_receive_expect(pmonitor->m_recvfd,
787: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 788:
1.103 markus 789: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
790: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 791:
1.103 markus 792: sshbuf_free(m);
1.29 markus 793: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
794: return (authenticated);
795: }
796: #endif /* GSSAPI */
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