Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.118
1.118 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.117 2019/12/15 18:57:30 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,
1.118 ! djm 215: const char *sk_provider, const char *sk_pin, 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__);
1.103 markus 223: if ((m = sshbuf_new()) == NULL)
224: fatal("%s: sshbuf_new failed", __func__);
225: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
226: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
1.106 markus 227: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
228: (r = sshbuf_put_u32(m, compat)) != 0)
1.103 markus 229: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 230:
1.103 markus 231: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 232:
1.8 markus 233: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.103 markus 234: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
1.106 markus 235: if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
1.103 markus 236: fatal("%s: buffer error: %s", __func__, ssh_err(r));
237: sshbuf_free(m);
1.1 provos 238:
239: return (0);
240: }
241:
242: struct passwd *
1.109 djm 243: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 244: {
1.103 markus 245: struct sshbuf *m;
1.1 provos 246: struct passwd *pw;
1.103 markus 247: size_t len;
248: u_int i;
1.55 dtucker 249: ServerOptions *newopts;
1.103 markus 250: int r;
251: u_char ok;
252: const u_char *p;
1.1 provos 253:
1.8 markus 254: debug3("%s entering", __func__);
1.1 provos 255:
1.103 markus 256: if ((m = sshbuf_new()) == NULL)
257: fatal("%s: sshbuf_new failed", __func__);
258: if ((r = sshbuf_put_cstring(m, username)) != 0)
259: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 260:
1.103 markus 261: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 262:
1.8 markus 263: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 264: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 265:
1.103 markus 266: if ((r = sshbuf_get_u8(m, &ok)) != 0)
267: fatal("%s: buffer error: %s", __func__, ssh_err(r));
268: if (ok == 0) {
1.60 dtucker 269: pw = NULL;
270: goto out;
1.1 provos 271: }
1.103 markus 272:
273: /* XXX don't like passing struct passwd like this */
274: pw = xcalloc(sizeof(*pw), 1);
275: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
276: fatal("%s: buffer error: %s", __func__, ssh_err(r));
277: if (len != sizeof(*pw))
1.8 markus 278: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 279: memcpy(pw, p, sizeof(*pw));
280:
281: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
282: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
283: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
284: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
285: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
286: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
287: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 288:
1.60 dtucker 289: out:
1.55 dtucker 290: /* copy options block as a Match directive may have changed some */
1.103 markus 291: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
292: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 293: if (len != sizeof(*newopts))
294: fatal("%s: option block size mismatch", __func__);
1.103 markus 295: newopts = xcalloc(sizeof(*newopts), 1);
296: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 297:
298: #define M_CP_STROPT(x) do { \
1.103 markus 299: if (newopts->x != NULL) { \
300: if ((r = sshbuf_get_cstring(m, \
301: &newopts->x, NULL)) != 0) \
302: fatal("%s: buffer error: %s", \
303: __func__, ssh_err(r)); \
304: } \
1.71 djm 305: } while (0)
1.72 djm 306: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 307: newopts->x = newopts->nx == 0 ? \
308: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 309: for (i = 0; i < newopts->nx; i++) { \
310: if ((r = sshbuf_get_cstring(m, \
311: &newopts->x[i], NULL)) != 0) \
312: fatal("%s: buffer error: %s", \
313: __func__, ssh_err(r)); \
314: } \
1.72 djm 315: } while (0)
1.71 djm 316: /* See comment in servconf.h */
317: COPY_MATCH_STRING_OPTS();
318: #undef M_CP_STROPT
1.72 djm 319: #undef M_CP_STRARRAYOPT
1.71 djm 320:
1.55 dtucker 321: copy_set_server_options(&options, newopts, 1);
1.90 djm 322: log_change_level(options.log_level);
1.93 djm 323: process_permitopen(ssh, &options);
1.76 djm 324: free(newopts);
1.55 dtucker 325:
1.103 markus 326: sshbuf_free(m);
1.1 provos 327:
328: return (pw);
1.6 djm 329: }
330:
1.33 markus 331: char *
332: mm_auth2_read_banner(void)
1.6 djm 333: {
1.103 markus 334: struct sshbuf *m;
1.6 djm 335: char *banner;
1.103 markus 336: int r;
1.6 djm 337:
1.8 markus 338: debug3("%s entering", __func__);
1.6 djm 339:
1.103 markus 340: if ((m = sshbuf_new()) == NULL)
341: fatal("%s: sshbuf_new failed", __func__);
342: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
343: sshbuf_reset(m);
1.6 djm 344:
1.33 markus 345: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 346: MONITOR_ANS_AUTH2_READ_BANNER, m);
347: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
348: fatal("%s: buffer error: %s", __func__, ssh_err(r));
349: sshbuf_free(m);
1.10 deraadt 350:
1.33 markus 351: /* treat empty banner as missing banner */
352: if (strlen(banner) == 0) {
1.76 djm 353: free(banner);
1.33 markus 354: banner = NULL;
355: }
1.6 djm 356: return (banner);
1.1 provos 357: }
358:
359: /* Inform the privileged process about service and style */
360:
361: void
362: mm_inform_authserv(char *service, char *style)
363: {
1.103 markus 364: struct sshbuf *m;
365: int r;
1.1 provos 366:
1.8 markus 367: debug3("%s entering", __func__);
1.1 provos 368:
1.103 markus 369: if ((m = sshbuf_new()) == NULL)
370: fatal("%s: sshbuf_new failed", __func__);
371: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
372: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
373: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 374:
1.103 markus 375: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 376:
1.103 markus 377: sshbuf_free(m);
1.1 provos 378: }
379:
380: /* Do the password authentication */
381: int
1.99 djm 382: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 383: {
1.103 markus 384: struct sshbuf *m;
385: int r, authenticated = 0;
1.1 provos 386:
1.8 markus 387: debug3("%s entering", __func__);
1.1 provos 388:
1.103 markus 389: if ((m = sshbuf_new()) == NULL)
390: fatal("%s: sshbuf_new failed", __func__);
391: if ((r = sshbuf_put_cstring(m, password)) != 0)
392: fatal("%s: buffer error: %s", __func__, ssh_err(r));
393: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 394:
1.8 markus 395: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 396: mm_request_receive_expect(pmonitor->m_recvfd,
397: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 398:
1.103 markus 399: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
400: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 401:
1.103 markus 402: sshbuf_free(m);
1.1 provos 403:
1.3 markus 404: debug3("%s: user %sauthenticated",
1.8 markus 405: __func__, authenticated ? "" : "not ");
1.1 provos 406: return (authenticated);
407: }
408:
409: int
1.99 djm 410: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
411: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 412: {
1.85 djm 413: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 414: pubkey_auth_attempt, authoptp));
1.1 provos 415: }
416:
417: int
1.111 djm 418: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
419: const char *user, const char *host, struct sshkey *key)
1.1 provos 420: {
1.99 djm 421: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 422: }
423:
424: int
1.88 djm 425: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 426: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 427: {
1.103 markus 428: struct sshbuf *m;
1.99 djm 429: int r, allowed = 0;
430: struct sshauthopt *opts = NULL;
1.1 provos 431:
1.8 markus 432: debug3("%s entering", __func__);
1.1 provos 433:
1.99 djm 434: if (authoptp != NULL)
435: *authoptp = NULL;
436:
1.103 markus 437: if ((m = sshbuf_new()) == NULL)
438: fatal("%s: sshbuf_new failed", __func__);
439: if ((r = sshbuf_put_u32(m, type)) != 0 ||
440: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
441: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
442: (r = sshkey_puts(key, m)) != 0 ||
443: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
444: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 445:
1.103 markus 446: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 447:
1.8 markus 448: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 449: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 450: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 451:
1.103 markus 452: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
453: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 454: if (allowed && type == MM_USERKEY) {
1.103 markus 455: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 456: fatal("%s: sshauthopt_deserialise: %s",
457: __func__, ssh_err(r));
458: }
1.103 markus 459: sshbuf_free(m);
1.1 provos 460:
1.99 djm 461: if (authoptp != NULL) {
462: *authoptp = opts;
463: opts = NULL;
464: }
465: sshauthopt_free(opts);
1.1 provos 466:
1.99 djm 467: return allowed;
1.1 provos 468: }
469:
1.3 markus 470: /*
1.1 provos 471: * This key verify needs to send the key type along, because the
472: * privileged parent makes the decision if the key is allowed
473: * for authentication.
474: */
475:
476: int
1.92 markus 477: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.116 djm 478: const u_char *data, size_t datalen, const char *sigalg, u_int compat,
479: struct sshkey_sig_details **sig_detailsp)
1.1 provos 480: {
1.103 markus 481: struct sshbuf *m;
1.92 markus 482: u_int encoded_ret = 0;
1.103 markus 483: int r;
1.116 djm 484: u_char sig_details_present, flags;
485: u_int counter;
1.1 provos 486:
1.8 markus 487: debug3("%s entering", __func__);
1.1 provos 488:
1.116 djm 489: if (sig_detailsp != NULL)
490: *sig_detailsp = NULL;
1.103 markus 491: if ((m = sshbuf_new()) == NULL)
492: fatal("%s: sshbuf_new failed", __func__);
493: if ((r = sshkey_puts(key, m)) != 0 ||
494: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
495: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
496: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
497: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 498:
1.103 markus 499: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 500:
1.8 markus 501: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 502: mm_request_receive_expect(pmonitor->m_recvfd,
503: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 504:
1.116 djm 505: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
506: (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
1.103 markus 507: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.116 djm 508: if (sig_details_present && encoded_ret == 0) {
509: if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
510: (r = sshbuf_get_u8(m, &flags)) != 0)
511: fatal("%s: buffer error: %s", __func__, ssh_err(r));
512: if (sig_detailsp != NULL) {
513: *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
514: (*sig_detailsp)->sk_counter = counter;
515: (*sig_detailsp)->sk_flags = flags;
516: }
517: }
1.1 provos 518:
1.103 markus 519: sshbuf_free(m);
1.1 provos 520:
1.92 markus 521: if (encoded_ret != 0)
522: return SSH_ERR_SIGNATURE_INVALID;
523: return 0;
1.1 provos 524: }
525:
526: void
1.111 djm 527: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 528: {
1.82 markus 529: struct sshbuf *m;
530: int r;
531:
532: if ((m = sshbuf_new()) == NULL)
533: fatal("%s: sshbuf_new failed", __func__);
534: if ((r = ssh_packet_get_state(ssh, m)) != 0)
535: fatal("%s: get_state failed: %s",
536: __func__, ssh_err(r));
537: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 538: debug3("%s: Finished sending state", __func__);
1.82 markus 539: sshbuf_free(m);
1.1 provos 540: }
541:
542: int
1.42 deraadt 543: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 544: {
1.103 markus 545: struct sshbuf *m;
1.39 dtucker 546: char *p, *msg;
1.102 markus 547: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 548:
549: /* Kludge: ensure there are fds free to receive the pty/tty */
550: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
551: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
552: error("%s: cannot allocate fds for pty", __func__);
553: if (tmp1 > 0)
554: close(tmp1);
555: if (tmp2 > 0)
556: close(tmp2);
557: return 0;
558: }
559: close(tmp1);
560: close(tmp2);
1.1 provos 561:
1.103 markus 562: if ((m = sshbuf_new()) == NULL)
563: fatal("%s: sshbuf_new failed", __func__);
564: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 565:
1.8 markus 566: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 567: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 568:
1.103 markus 569: if ((r = sshbuf_get_u32(m, &success)) != 0)
570: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 571: if (success == 0) {
1.8 markus 572: debug3("%s: pty alloc failed", __func__);
1.103 markus 573: sshbuf_free(m);
1.1 provos 574: return (0);
575: }
1.103 markus 576: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
577: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
578: fatal("%s: buffer error: %s", __func__, ssh_err(r));
579: sshbuf_free(m);
1.1 provos 580:
581: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 582: free(p);
1.39 dtucker 583:
1.102 markus 584: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
585: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 586: free(msg);
1.1 provos 587:
1.58 djm 588: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
589: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
590: fatal("%s: receive fds failed", __func__);
1.1 provos 591:
592: /* Success */
593: return (1);
594: }
595:
596: void
1.32 markus 597: mm_session_pty_cleanup2(Session *s)
1.1 provos 598: {
1.103 markus 599: struct sshbuf *m;
600: int r;
1.1 provos 601:
602: if (s->ttyfd == -1)
603: return;
1.103 markus 604: if ((m = sshbuf_new()) == NULL)
605: fatal("%s: sshbuf_new failed", __func__);
606: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
607: fatal("%s: buffer error: %s", __func__, ssh_err(r));
608: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
609: sshbuf_free(m);
1.3 markus 610:
1.1 provos 611: /* closed dup'ed master */
1.113 deraadt 612: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.62 djm 613: error("close(s->ptymaster/%d): %s",
614: s->ptymaster, strerror(errno));
1.1 provos 615:
616: /* unlink pty from session */
617: s->ttyfd = -1;
618: }
619:
620: /* Request process termination */
621:
622: void
623: mm_terminate(void)
624: {
1.103 markus 625: struct sshbuf *m;
1.1 provos 626:
1.103 markus 627: if ((m = sshbuf_new()) == NULL)
628: fatal("%s: sshbuf_new failed", __func__);
629: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
630: sshbuf_free(m);
1.1 provos 631: }
632:
1.2 markus 633: static void
1.1 provos 634: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
635: char ***prompts, u_int **echo_on)
636: {
1.10 deraadt 637: *name = xstrdup("");
638: *infotxt = xstrdup("");
1.1 provos 639: *numprompts = 1;
1.43 djm 640: *prompts = xcalloc(*numprompts, sizeof(char *));
641: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 642: (*echo_on)[0] = 0;
643: }
644:
645: int
646: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
647: u_int *numprompts, char ***prompts, u_int **echo_on)
648: {
1.103 markus 649: struct sshbuf *m;
1.21 markus 650: u_int success;
1.1 provos 651: char *challenge;
1.103 markus 652: int r;
1.1 provos 653:
1.8 markus 654: debug3("%s: entering", __func__);
1.1 provos 655:
1.103 markus 656: if ((m = sshbuf_new()) == NULL)
657: fatal("%s: sshbuf_new failed", __func__);
658: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 659:
1.103 markus 660: mm_request_receive_expect(pmonitor->m_recvfd,
661: MONITOR_ANS_BSDAUTHQUERY, m);
662: if ((r = sshbuf_get_u32(m, &success)) != 0)
663: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 664: if (success == 0) {
1.8 markus 665: debug3("%s: no challenge", __func__);
1.103 markus 666: sshbuf_free(m);
1.1 provos 667: return (-1);
668: }
669:
670: /* Get the challenge, and format the response */
1.103 markus 671: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
672: fatal("%s: buffer error: %s", __func__, ssh_err(r));
673: sshbuf_free(m);
1.1 provos 674:
675: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
676: (*prompts)[0] = challenge;
677:
1.8 markus 678: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 679:
680: return (0);
681: }
682:
683: int
684: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
685: {
1.103 markus 686: struct sshbuf *m;
687: int r, authok;
1.1 provos 688:
1.8 markus 689: debug3("%s: entering", __func__);
1.1 provos 690: if (numresponses != 1)
691: return (-1);
692:
1.103 markus 693: if ((m = sshbuf_new()) == NULL)
694: fatal("%s: sshbuf_new failed", __func__);
695: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
696: fatal("%s: buffer error: %s", __func__, ssh_err(r));
697: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 698:
1.7 mouring 699: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 700: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 701:
1.103 markus 702: if ((r = sshbuf_get_u32(m, &authok)) != 0)
703: fatal("%s: buffer error: %s", __func__, ssh_err(r));
704: sshbuf_free(m);
1.1 provos 705:
706: return ((authok == 0) ? -1 : 0);
707: }
1.29 markus 708:
709: #ifdef GSSAPI
710: OM_uint32
1.36 avsm 711: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 712: {
1.103 markus 713: struct sshbuf *m;
1.29 markus 714: OM_uint32 major;
1.103 markus 715: int r;
1.29 markus 716:
717: /* Client doesn't get to see the context */
718: *ctx = NULL;
719:
1.103 markus 720: if ((m = sshbuf_new()) == NULL)
721: fatal("%s: sshbuf_new failed", __func__);
722: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
723: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 724:
1.103 markus 725: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
726: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 727:
1.103 markus 728: if ((r = sshbuf_get_u32(m, &major)) != 0)
729: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 730:
1.103 markus 731: sshbuf_free(m);
1.29 markus 732: return (major);
733: }
734:
735: OM_uint32
736: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 737: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 738: {
1.103 markus 739: struct sshbuf *m;
1.29 markus 740: OM_uint32 major;
1.103 markus 741: u_int flags;
742: int r;
1.29 markus 743:
1.103 markus 744: if ((m = sshbuf_new()) == NULL)
745: fatal("%s: sshbuf_new failed", __func__);
746: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
747: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 748:
1.103 markus 749: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
750: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 751:
1.103 markus 752: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 753: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 754: fatal("%s: buffer error: %s", __func__, ssh_err(r));
755: if (flagsp != NULL) {
756: if ((r = sshbuf_get_u32(m, &flags)) != 0)
757: fatal("%s: buffer error: %s", __func__, ssh_err(r));
758: *flagsp = flags;
759: }
1.29 markus 760:
1.103 markus 761: sshbuf_free(m);
1.29 markus 762:
763: return (major);
1.35 markus 764: }
765:
766: OM_uint32
767: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
768: {
1.103 markus 769: struct sshbuf *m;
1.35 markus 770: OM_uint32 major;
1.103 markus 771: int r;
772:
773: if ((m = sshbuf_new()) == NULL)
774: fatal("%s: sshbuf_new failed", __func__);
775: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
776: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
777: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 778:
1.103 markus 779: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
780: mm_request_receive_expect(pmonitor->m_recvfd,
781: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 782:
1.103 markus 783: if ((r = sshbuf_get_u32(m, &major)) != 0)
784: fatal("%s: buffer error: %s", __func__, ssh_err(r));
785: sshbuf_free(m);
1.35 markus 786: return(major);
1.29 markus 787: }
788:
789: int
790: mm_ssh_gssapi_userok(char *user)
791: {
1.103 markus 792: struct sshbuf *m;
793: int r, authenticated = 0;
1.29 markus 794:
1.103 markus 795: if ((m = sshbuf_new()) == NULL)
796: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 797:
1.103 markus 798: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
799: mm_request_receive_expect(pmonitor->m_recvfd,
800: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 801:
1.103 markus 802: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
803: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 804:
1.103 markus 805: sshbuf_free(m);
1.29 markus 806: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
807: return (authenticated);
808: }
809: #endif /* GSSAPI */
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