Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.112
1.112 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.111 2019/01/19 21:43:56 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:
1.1 provos 74: /* Imports */
1.7 mouring 75: extern struct monitor *pmonitor;
1.102 markus 76: extern struct sshbuf *loginmsg;
1.55 dtucker 77: extern ServerOptions options;
1.73 djm 78:
79: void
80: mm_log_handler(LogLevel level, const char *msg, void *ctx)
81: {
1.103 markus 82: struct sshbuf *log_msg;
1.73 djm 83: struct monitor *mon = (struct monitor *)ctx;
1.103 markus 84: int r;
85: size_t len;
1.73 djm 86:
87: if (mon->m_log_sendfd == -1)
88: fatal("%s: no log channel", __func__);
89:
1.103 markus 90: if ((log_msg = sshbuf_new()) == NULL)
91: fatal("%s: sshbuf_new failed", __func__);
1.73 djm 92:
1.103 markus 93: if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */
94: (r = sshbuf_put_u32(log_msg, level)) != 0 ||
95: (r = sshbuf_put_cstring(log_msg, msg)) != 0)
96: fatal("%s: buffer error: %s", __func__, ssh_err(r));
97: if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
98: fatal("%s: bad length %zu", __func__, len);
99: POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4);
100: if (atomicio(vwrite, mon->m_log_sendfd,
101: sshbuf_mutable_ptr(log_msg), len) != len)
1.73 djm 102: fatal("%s: write: %s", __func__, strerror(errno));
1.103 markus 103: sshbuf_free(log_msg);
1.73 djm 104: }
1.1 provos 105:
1.32 markus 106: int
107: mm_is_monitor(void)
108: {
109: /*
110: * m_pid is only set in the privileged part, and
111: * points to the unprivileged child.
112: */
1.34 markus 113: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 114: }
115:
1.1 provos 116: void
1.103 markus 117: mm_request_send(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 118: {
1.103 markus 119: size_t mlen = sshbuf_len(m);
1.1 provos 120: u_char buf[5];
121:
1.8 markus 122: debug3("%s entering: type %d", __func__, type);
1.1 provos 123:
1.103 markus 124: if (mlen >= 0xffffffff)
125: fatal("%s: bad length %zu", __func__, mlen);
126: POKE_U32(buf, mlen + 1);
1.10 deraadt 127: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 128: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 129: fatal("%s: write: %s", __func__, strerror(errno));
1.103 markus 130: if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen)
1.40 avsm 131: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 132: }
133:
134: void
1.103 markus 135: mm_request_receive(int sock, struct sshbuf *m)
1.1 provos 136: {
1.103 markus 137: u_char buf[4], *p = NULL;
1.13 deraadt 138: u_int msg_len;
1.103 markus 139: int r;
1.1 provos 140:
1.8 markus 141: debug3("%s entering", __func__);
1.1 provos 142:
1.40 avsm 143: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
144: if (errno == EPIPE)
1.32 markus 145: cleanup_exit(255);
1.40 avsm 146: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 147: }
1.103 markus 148: msg_len = PEEK_U32(buf);
1.1 provos 149: if (msg_len > 256 * 1024)
1.8 markus 150: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.103 markus 151: sshbuf_reset(m);
152: if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
153: fatal("%s: buffer error: %s", __func__, ssh_err(r));
154: if (atomicio(read, sock, p, msg_len) != msg_len)
1.40 avsm 155: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 156: }
157:
158: void
1.103 markus 159: mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 160: {
161: u_char rtype;
1.103 markus 162: int r;
1.1 provos 163:
1.8 markus 164: debug3("%s entering: type %d", __func__, type);
1.1 provos 165:
1.36 avsm 166: mm_request_receive(sock, m);
1.103 markus 167: if ((r = sshbuf_get_u8(m, &rtype)) != 0)
168: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 169: if (rtype != type)
1.8 markus 170: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 171: rtype, type);
172: }
173:
1.80 markus 174: #ifdef WITH_OPENSSL
1.1 provos 175: DH *
176: mm_choose_dh(int min, int nbits, int max)
177: {
178: BIGNUM *p, *g;
1.103 markus 179: int r;
180: u_char success = 0;
181: struct sshbuf *m;
1.1 provos 182:
1.103 markus 183: if ((m = sshbuf_new()) == NULL)
184: fatal("%s: sshbuf_new failed", __func__);
185: if ((r = sshbuf_put_u32(m, min)) != 0 ||
186: (r = sshbuf_put_u32(m, nbits)) != 0 ||
187: (r = sshbuf_put_u32(m, max)) != 0)
188: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 189:
1.103 markus 190: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
1.1 provos 191:
1.8 markus 192: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.103 markus 193: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m);
1.1 provos 194:
1.103 markus 195: if ((r = sshbuf_get_u8(m, &success)) != 0)
196: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 197: if (success == 0)
1.8 markus 198: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 199:
1.112 ! djm 200: if ((r = sshbuf_get_bignum2(m, &p)) != 0 ||
! 201: (r = sshbuf_get_bignum2(m, &g)) != 0)
1.103 markus 202: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 203:
1.103 markus 204: debug3("%s: remaining %zu", __func__, sshbuf_len(m));
205: sshbuf_free(m);
1.1 provos 206:
207: return (dh_new_group(g, p));
208: }
1.80 markus 209: #endif
1.1 provos 210:
211: int
1.111 djm 212: mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.106 markus 213: const u_char *data, size_t datalen, const char *hostkey_alg, u_int compat)
1.1 provos 214: {
1.83 markus 215: struct kex *kex = *pmonitor->m_pkex;
1.103 markus 216: struct sshbuf *m;
1.111 djm 217: u_int ndx = kex->host_key_index(key, 0, ssh);
1.103 markus 218: int r;
1.1 provos 219:
1.8 markus 220: debug3("%s entering", __func__);
1.1 provos 221:
1.103 markus 222: if ((m = sshbuf_new()) == NULL)
223: fatal("%s: sshbuf_new failed", __func__);
224: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
225: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
1.106 markus 226: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
227: (r = sshbuf_put_u32(m, compat)) != 0)
1.103 markus 228: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 229:
1.103 markus 230: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 231:
1.8 markus 232: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.103 markus 233: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
1.106 markus 234: if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
1.103 markus 235: fatal("%s: buffer error: %s", __func__, ssh_err(r));
236: sshbuf_free(m);
1.1 provos 237:
238: return (0);
239: }
240:
241: struct passwd *
1.109 djm 242: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 243: {
1.103 markus 244: struct sshbuf *m;
1.1 provos 245: struct passwd *pw;
1.103 markus 246: size_t len;
247: u_int i;
1.55 dtucker 248: ServerOptions *newopts;
1.103 markus 249: int r;
250: u_char ok;
251: const u_char *p;
1.1 provos 252:
1.8 markus 253: debug3("%s entering", __func__);
1.1 provos 254:
1.103 markus 255: if ((m = sshbuf_new()) == NULL)
256: fatal("%s: sshbuf_new failed", __func__);
257: if ((r = sshbuf_put_cstring(m, username)) != 0)
258: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 259:
1.103 markus 260: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 261:
1.8 markus 262: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 263: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 264:
1.103 markus 265: if ((r = sshbuf_get_u8(m, &ok)) != 0)
266: fatal("%s: buffer error: %s", __func__, ssh_err(r));
267: if (ok == 0) {
1.60 dtucker 268: pw = NULL;
269: goto out;
1.1 provos 270: }
1.103 markus 271:
272: /* XXX don't like passing struct passwd like this */
273: pw = xcalloc(sizeof(*pw), 1);
274: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
275: fatal("%s: buffer error: %s", __func__, ssh_err(r));
276: if (len != sizeof(*pw))
1.8 markus 277: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 278: memcpy(pw, p, sizeof(*pw));
279:
280: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
281: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
282: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
283: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
284: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
285: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
286: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 287:
1.60 dtucker 288: out:
1.55 dtucker 289: /* copy options block as a Match directive may have changed some */
1.103 markus 290: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
291: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 292: if (len != sizeof(*newopts))
293: fatal("%s: option block size mismatch", __func__);
1.103 markus 294: newopts = xcalloc(sizeof(*newopts), 1);
295: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 296:
297: #define M_CP_STROPT(x) do { \
1.103 markus 298: if (newopts->x != NULL) { \
299: if ((r = sshbuf_get_cstring(m, \
300: &newopts->x, NULL)) != 0) \
301: fatal("%s: buffer error: %s", \
302: __func__, ssh_err(r)); \
303: } \
1.71 djm 304: } while (0)
1.72 djm 305: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 306: newopts->x = newopts->nx == 0 ? \
307: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 308: for (i = 0; i < newopts->nx; i++) { \
309: if ((r = sshbuf_get_cstring(m, \
310: &newopts->x[i], NULL)) != 0) \
311: fatal("%s: buffer error: %s", \
312: __func__, ssh_err(r)); \
313: } \
1.72 djm 314: } while (0)
1.71 djm 315: /* See comment in servconf.h */
316: COPY_MATCH_STRING_OPTS();
317: #undef M_CP_STROPT
1.72 djm 318: #undef M_CP_STRARRAYOPT
1.71 djm 319:
1.55 dtucker 320: copy_set_server_options(&options, newopts, 1);
1.90 djm 321: log_change_level(options.log_level);
1.93 djm 322: process_permitopen(ssh, &options);
1.76 djm 323: free(newopts);
1.55 dtucker 324:
1.103 markus 325: sshbuf_free(m);
1.1 provos 326:
327: return (pw);
1.6 djm 328: }
329:
1.33 markus 330: char *
331: mm_auth2_read_banner(void)
1.6 djm 332: {
1.103 markus 333: struct sshbuf *m;
1.6 djm 334: char *banner;
1.103 markus 335: int r;
1.6 djm 336:
1.8 markus 337: debug3("%s entering", __func__);
1.6 djm 338:
1.103 markus 339: if ((m = sshbuf_new()) == NULL)
340: fatal("%s: sshbuf_new failed", __func__);
341: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
342: sshbuf_reset(m);
1.6 djm 343:
1.33 markus 344: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 345: MONITOR_ANS_AUTH2_READ_BANNER, m);
346: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
347: fatal("%s: buffer error: %s", __func__, ssh_err(r));
348: sshbuf_free(m);
1.10 deraadt 349:
1.33 markus 350: /* treat empty banner as missing banner */
351: if (strlen(banner) == 0) {
1.76 djm 352: free(banner);
1.33 markus 353: banner = NULL;
354: }
1.6 djm 355: return (banner);
1.1 provos 356: }
357:
358: /* Inform the privileged process about service and style */
359:
360: void
361: mm_inform_authserv(char *service, char *style)
362: {
1.103 markus 363: struct sshbuf *m;
364: int r;
1.1 provos 365:
1.8 markus 366: debug3("%s entering", __func__);
1.1 provos 367:
1.103 markus 368: if ((m = sshbuf_new()) == NULL)
369: fatal("%s: sshbuf_new failed", __func__);
370: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
371: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
372: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 373:
1.103 markus 374: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 375:
1.103 markus 376: sshbuf_free(m);
1.1 provos 377: }
378:
379: /* Do the password authentication */
380: int
1.99 djm 381: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 382: {
1.103 markus 383: struct sshbuf *m;
384: int r, authenticated = 0;
1.1 provos 385:
1.8 markus 386: debug3("%s entering", __func__);
1.1 provos 387:
1.103 markus 388: if ((m = sshbuf_new()) == NULL)
389: fatal("%s: sshbuf_new failed", __func__);
390: if ((r = sshbuf_put_cstring(m, password)) != 0)
391: fatal("%s: buffer error: %s", __func__, ssh_err(r));
392: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 393:
1.8 markus 394: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 395: mm_request_receive_expect(pmonitor->m_recvfd,
396: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 397:
1.103 markus 398: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
399: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 400:
1.103 markus 401: sshbuf_free(m);
1.1 provos 402:
1.3 markus 403: debug3("%s: user %sauthenticated",
1.8 markus 404: __func__, authenticated ? "" : "not ");
1.1 provos 405: return (authenticated);
406: }
407:
408: int
1.99 djm 409: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
410: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 411: {
1.85 djm 412: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 413: pubkey_auth_attempt, authoptp));
1.1 provos 414: }
415:
416: int
1.111 djm 417: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
418: const char *user, const char *host, struct sshkey *key)
1.1 provos 419: {
1.99 djm 420: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 421: }
422:
423: int
1.88 djm 424: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 425: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 426: {
1.103 markus 427: struct sshbuf *m;
1.99 djm 428: int r, allowed = 0;
429: struct sshauthopt *opts = NULL;
1.1 provos 430:
1.8 markus 431: debug3("%s entering", __func__);
1.1 provos 432:
1.99 djm 433: if (authoptp != NULL)
434: *authoptp = NULL;
435:
1.103 markus 436: if ((m = sshbuf_new()) == NULL)
437: fatal("%s: sshbuf_new failed", __func__);
438: if ((r = sshbuf_put_u32(m, type)) != 0 ||
439: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
440: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
441: (r = sshkey_puts(key, m)) != 0 ||
442: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
443: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 444:
1.103 markus 445: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 446:
1.8 markus 447: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 448: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 449: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 450:
1.103 markus 451: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
452: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 453: if (allowed && type == MM_USERKEY) {
1.103 markus 454: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 455: fatal("%s: sshauthopt_deserialise: %s",
456: __func__, ssh_err(r));
457: }
1.103 markus 458: sshbuf_free(m);
1.1 provos 459:
1.99 djm 460: if (authoptp != NULL) {
461: *authoptp = opts;
462: opts = NULL;
463: }
464: sshauthopt_free(opts);
1.1 provos 465:
1.99 djm 466: return allowed;
1.1 provos 467: }
468:
1.3 markus 469: /*
1.1 provos 470: * This key verify needs to send the key type along, because the
471: * privileged parent makes the decision if the key is allowed
472: * for authentication.
473: */
474:
475: int
1.92 markus 476: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.96 djm 477: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
1.1 provos 478: {
1.103 markus 479: struct sshbuf *m;
1.92 markus 480: u_int encoded_ret = 0;
1.103 markus 481: int r;
1.1 provos 482:
1.8 markus 483: debug3("%s entering", __func__);
1.1 provos 484:
485:
1.103 markus 486: if ((m = sshbuf_new()) == NULL)
487: fatal("%s: sshbuf_new failed", __func__);
488: if ((r = sshkey_puts(key, m)) != 0 ||
489: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
490: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
491: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
492: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 493:
1.103 markus 494: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 495:
1.8 markus 496: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 497: mm_request_receive_expect(pmonitor->m_recvfd,
498: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 499:
1.103 markus 500: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0)
501: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 502:
1.103 markus 503: sshbuf_free(m);
1.1 provos 504:
1.92 markus 505: if (encoded_ret != 0)
506: return SSH_ERR_SIGNATURE_INVALID;
507: return 0;
1.1 provos 508: }
509:
510: void
1.111 djm 511: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 512: {
1.82 markus 513: struct sshbuf *m;
514: int r;
515:
516: if ((m = sshbuf_new()) == NULL)
517: fatal("%s: sshbuf_new failed", __func__);
518: if ((r = ssh_packet_get_state(ssh, m)) != 0)
519: fatal("%s: get_state failed: %s",
520: __func__, ssh_err(r));
521: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 522: debug3("%s: Finished sending state", __func__);
1.82 markus 523: sshbuf_free(m);
1.1 provos 524: }
525:
526: int
1.42 deraadt 527: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 528: {
1.103 markus 529: struct sshbuf *m;
1.39 dtucker 530: char *p, *msg;
1.102 markus 531: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 532:
533: /* Kludge: ensure there are fds free to receive the pty/tty */
534: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
535: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
536: error("%s: cannot allocate fds for pty", __func__);
537: if (tmp1 > 0)
538: close(tmp1);
539: if (tmp2 > 0)
540: close(tmp2);
541: return 0;
542: }
543: close(tmp1);
544: close(tmp2);
1.1 provos 545:
1.103 markus 546: if ((m = sshbuf_new()) == NULL)
547: fatal("%s: sshbuf_new failed", __func__);
548: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 549:
1.8 markus 550: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 551: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 552:
1.103 markus 553: if ((r = sshbuf_get_u32(m, &success)) != 0)
554: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 555: if (success == 0) {
1.8 markus 556: debug3("%s: pty alloc failed", __func__);
1.103 markus 557: sshbuf_free(m);
1.1 provos 558: return (0);
559: }
1.103 markus 560: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
561: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
562: fatal("%s: buffer error: %s", __func__, ssh_err(r));
563: sshbuf_free(m);
1.1 provos 564:
565: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 566: free(p);
1.39 dtucker 567:
1.102 markus 568: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
569: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 570: free(msg);
1.1 provos 571:
1.58 djm 572: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
573: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
574: fatal("%s: receive fds failed", __func__);
1.1 provos 575:
576: /* Success */
577: return (1);
578: }
579:
580: void
1.32 markus 581: mm_session_pty_cleanup2(Session *s)
1.1 provos 582: {
1.103 markus 583: struct sshbuf *m;
584: int r;
1.1 provos 585:
586: if (s->ttyfd == -1)
587: return;
1.103 markus 588: if ((m = sshbuf_new()) == NULL)
589: fatal("%s: sshbuf_new failed", __func__);
590: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
591: fatal("%s: buffer error: %s", __func__, ssh_err(r));
592: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
593: sshbuf_free(m);
1.3 markus 594:
1.1 provos 595: /* closed dup'ed master */
1.62 djm 596: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
597: error("close(s->ptymaster/%d): %s",
598: s->ptymaster, strerror(errno));
1.1 provos 599:
600: /* unlink pty from session */
601: s->ttyfd = -1;
602: }
603:
604: /* Request process termination */
605:
606: void
607: mm_terminate(void)
608: {
1.103 markus 609: struct sshbuf *m;
1.1 provos 610:
1.103 markus 611: if ((m = sshbuf_new()) == NULL)
612: fatal("%s: sshbuf_new failed", __func__);
613: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
614: sshbuf_free(m);
1.1 provos 615: }
616:
1.2 markus 617: static void
1.1 provos 618: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
619: char ***prompts, u_int **echo_on)
620: {
1.10 deraadt 621: *name = xstrdup("");
622: *infotxt = xstrdup("");
1.1 provos 623: *numprompts = 1;
1.43 djm 624: *prompts = xcalloc(*numprompts, sizeof(char *));
625: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 626: (*echo_on)[0] = 0;
627: }
628:
629: int
630: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
631: u_int *numprompts, char ***prompts, u_int **echo_on)
632: {
1.103 markus 633: struct sshbuf *m;
1.21 markus 634: u_int success;
1.1 provos 635: char *challenge;
1.103 markus 636: int r;
1.1 provos 637:
1.8 markus 638: debug3("%s: entering", __func__);
1.1 provos 639:
1.103 markus 640: if ((m = sshbuf_new()) == NULL)
641: fatal("%s: sshbuf_new failed", __func__);
642: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 643:
1.103 markus 644: mm_request_receive_expect(pmonitor->m_recvfd,
645: MONITOR_ANS_BSDAUTHQUERY, m);
646: if ((r = sshbuf_get_u32(m, &success)) != 0)
647: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 648: if (success == 0) {
1.8 markus 649: debug3("%s: no challenge", __func__);
1.103 markus 650: sshbuf_free(m);
1.1 provos 651: return (-1);
652: }
653:
654: /* Get the challenge, and format the response */
1.103 markus 655: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
656: fatal("%s: buffer error: %s", __func__, ssh_err(r));
657: sshbuf_free(m);
1.1 provos 658:
659: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
660: (*prompts)[0] = challenge;
661:
1.8 markus 662: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 663:
664: return (0);
665: }
666:
667: int
668: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
669: {
1.103 markus 670: struct sshbuf *m;
671: int r, authok;
1.1 provos 672:
1.8 markus 673: debug3("%s: entering", __func__);
1.1 provos 674: if (numresponses != 1)
675: return (-1);
676:
1.103 markus 677: if ((m = sshbuf_new()) == NULL)
678: fatal("%s: sshbuf_new failed", __func__);
679: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
680: fatal("%s: buffer error: %s", __func__, ssh_err(r));
681: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 682:
1.7 mouring 683: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 684: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 685:
1.103 markus 686: if ((r = sshbuf_get_u32(m, &authok)) != 0)
687: fatal("%s: buffer error: %s", __func__, ssh_err(r));
688: sshbuf_free(m);
1.1 provos 689:
690: return ((authok == 0) ? -1 : 0);
691: }
1.29 markus 692:
693: #ifdef GSSAPI
694: OM_uint32
1.36 avsm 695: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 696: {
1.103 markus 697: struct sshbuf *m;
1.29 markus 698: OM_uint32 major;
1.103 markus 699: int r;
1.29 markus 700:
701: /* Client doesn't get to see the context */
702: *ctx = NULL;
703:
1.103 markus 704: if ((m = sshbuf_new()) == NULL)
705: fatal("%s: sshbuf_new failed", __func__);
706: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
707: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 708:
1.103 markus 709: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
710: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 711:
1.103 markus 712: if ((r = sshbuf_get_u32(m, &major)) != 0)
713: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 714:
1.103 markus 715: sshbuf_free(m);
1.29 markus 716: return (major);
717: }
718:
719: OM_uint32
720: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 721: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 722: {
1.103 markus 723: struct sshbuf *m;
1.29 markus 724: OM_uint32 major;
1.103 markus 725: u_int flags;
726: int r;
1.29 markus 727:
1.103 markus 728: if ((m = sshbuf_new()) == NULL)
729: fatal("%s: sshbuf_new failed", __func__);
730: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
731: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 732:
1.103 markus 733: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
734: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 735:
1.103 markus 736: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 737: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 738: fatal("%s: buffer error: %s", __func__, ssh_err(r));
739: if (flagsp != NULL) {
740: if ((r = sshbuf_get_u32(m, &flags)) != 0)
741: fatal("%s: buffer error: %s", __func__, ssh_err(r));
742: *flagsp = flags;
743: }
1.29 markus 744:
1.103 markus 745: sshbuf_free(m);
1.29 markus 746:
747: return (major);
1.35 markus 748: }
749:
750: OM_uint32
751: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
752: {
1.103 markus 753: struct sshbuf *m;
1.35 markus 754: OM_uint32 major;
1.103 markus 755: int r;
756:
757: if ((m = sshbuf_new()) == NULL)
758: fatal("%s: sshbuf_new failed", __func__);
759: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
760: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
761: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 762:
1.103 markus 763: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
764: mm_request_receive_expect(pmonitor->m_recvfd,
765: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 766:
1.103 markus 767: if ((r = sshbuf_get_u32(m, &major)) != 0)
768: fatal("%s: buffer error: %s", __func__, ssh_err(r));
769: sshbuf_free(m);
1.35 markus 770: return(major);
1.29 markus 771: }
772:
773: int
774: mm_ssh_gssapi_userok(char *user)
775: {
1.103 markus 776: struct sshbuf *m;
777: int r, authenticated = 0;
1.29 markus 778:
1.103 markus 779: if ((m = sshbuf_new()) == NULL)
780: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 781:
1.103 markus 782: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
783: mm_request_receive_expect(pmonitor->m_recvfd,
784: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 785:
1.103 markus 786: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
787: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 788:
1.103 markus 789: sshbuf_free(m);
1.29 markus 790: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
791: return (authenticated);
792: }
793: #endif /* GSSAPI */
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