Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.111
1.111 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.110 2019/01/19 21:43:07 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:
200: if ((p = BN_new()) == NULL)
1.8 markus 201: fatal("%s: BN_new failed", __func__);
1.3 markus 202: if ((g = BN_new()) == NULL)
1.8 markus 203: fatal("%s: BN_new failed", __func__);
1.103 markus 204: if ((r = sshbuf_get_bignum2(m, p)) != 0 ||
205: (r = sshbuf_get_bignum2(m, g)) != 0)
206: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 207:
1.103 markus 208: debug3("%s: remaining %zu", __func__, sshbuf_len(m));
209: sshbuf_free(m);
1.1 provos 210:
211: return (dh_new_group(g, p));
212: }
1.80 markus 213: #endif
1.1 provos 214:
215: int
1.111 ! djm 216: mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.106 markus 217: const u_char *data, size_t datalen, const char *hostkey_alg, u_int compat)
1.1 provos 218: {
1.83 markus 219: struct kex *kex = *pmonitor->m_pkex;
1.103 markus 220: struct sshbuf *m;
1.111 ! djm 221: u_int ndx = kex->host_key_index(key, 0, ssh);
1.103 markus 222: int r;
1.1 provos 223:
1.8 markus 224: debug3("%s entering", __func__);
1.1 provos 225:
1.103 markus 226: if ((m = sshbuf_new()) == NULL)
227: fatal("%s: sshbuf_new failed", __func__);
228: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
229: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
1.106 markus 230: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
231: (r = sshbuf_put_u32(m, compat)) != 0)
1.103 markus 232: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 233:
1.103 markus 234: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 235:
1.8 markus 236: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.103 markus 237: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
1.106 markus 238: if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
1.103 markus 239: fatal("%s: buffer error: %s", __func__, ssh_err(r));
240: sshbuf_free(m);
1.1 provos 241:
242: return (0);
243: }
244:
245: struct passwd *
1.109 djm 246: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 247: {
1.103 markus 248: struct sshbuf *m;
1.1 provos 249: struct passwd *pw;
1.103 markus 250: size_t len;
251: u_int i;
1.55 dtucker 252: ServerOptions *newopts;
1.103 markus 253: int r;
254: u_char ok;
255: const u_char *p;
1.1 provos 256:
1.8 markus 257: debug3("%s entering", __func__);
1.1 provos 258:
1.103 markus 259: if ((m = sshbuf_new()) == NULL)
260: fatal("%s: sshbuf_new failed", __func__);
261: if ((r = sshbuf_put_cstring(m, username)) != 0)
262: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 263:
1.103 markus 264: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 265:
1.8 markus 266: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 267: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 268:
1.103 markus 269: if ((r = sshbuf_get_u8(m, &ok)) != 0)
270: fatal("%s: buffer error: %s", __func__, ssh_err(r));
271: if (ok == 0) {
1.60 dtucker 272: pw = NULL;
273: goto out;
1.1 provos 274: }
1.103 markus 275:
276: /* XXX don't like passing struct passwd like this */
277: pw = xcalloc(sizeof(*pw), 1);
278: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
279: fatal("%s: buffer error: %s", __func__, ssh_err(r));
280: if (len != sizeof(*pw))
1.8 markus 281: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 282: memcpy(pw, p, sizeof(*pw));
283:
284: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
285: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
286: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
287: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
288: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
289: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
290: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 291:
1.60 dtucker 292: out:
1.55 dtucker 293: /* copy options block as a Match directive may have changed some */
1.103 markus 294: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
295: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 296: if (len != sizeof(*newopts))
297: fatal("%s: option block size mismatch", __func__);
1.103 markus 298: newopts = xcalloc(sizeof(*newopts), 1);
299: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 300:
301: #define M_CP_STROPT(x) do { \
1.103 markus 302: if (newopts->x != NULL) { \
303: if ((r = sshbuf_get_cstring(m, \
304: &newopts->x, NULL)) != 0) \
305: fatal("%s: buffer error: %s", \
306: __func__, ssh_err(r)); \
307: } \
1.71 djm 308: } while (0)
1.72 djm 309: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 310: newopts->x = newopts->nx == 0 ? \
311: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 312: for (i = 0; i < newopts->nx; i++) { \
313: if ((r = sshbuf_get_cstring(m, \
314: &newopts->x[i], NULL)) != 0) \
315: fatal("%s: buffer error: %s", \
316: __func__, ssh_err(r)); \
317: } \
1.72 djm 318: } while (0)
1.71 djm 319: /* See comment in servconf.h */
320: COPY_MATCH_STRING_OPTS();
321: #undef M_CP_STROPT
1.72 djm 322: #undef M_CP_STRARRAYOPT
1.71 djm 323:
1.55 dtucker 324: copy_set_server_options(&options, newopts, 1);
1.90 djm 325: log_change_level(options.log_level);
1.93 djm 326: process_permitopen(ssh, &options);
1.76 djm 327: free(newopts);
1.55 dtucker 328:
1.103 markus 329: sshbuf_free(m);
1.1 provos 330:
331: return (pw);
1.6 djm 332: }
333:
1.33 markus 334: char *
335: mm_auth2_read_banner(void)
1.6 djm 336: {
1.103 markus 337: struct sshbuf *m;
1.6 djm 338: char *banner;
1.103 markus 339: int r;
1.6 djm 340:
1.8 markus 341: debug3("%s entering", __func__);
1.6 djm 342:
1.103 markus 343: if ((m = sshbuf_new()) == NULL)
344: fatal("%s: sshbuf_new failed", __func__);
345: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
346: sshbuf_reset(m);
1.6 djm 347:
1.33 markus 348: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 349: MONITOR_ANS_AUTH2_READ_BANNER, m);
350: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
351: fatal("%s: buffer error: %s", __func__, ssh_err(r));
352: sshbuf_free(m);
1.10 deraadt 353:
1.33 markus 354: /* treat empty banner as missing banner */
355: if (strlen(banner) == 0) {
1.76 djm 356: free(banner);
1.33 markus 357: banner = NULL;
358: }
1.6 djm 359: return (banner);
1.1 provos 360: }
361:
362: /* Inform the privileged process about service and style */
363:
364: void
365: mm_inform_authserv(char *service, char *style)
366: {
1.103 markus 367: struct sshbuf *m;
368: int r;
1.1 provos 369:
1.8 markus 370: debug3("%s entering", __func__);
1.1 provos 371:
1.103 markus 372: if ((m = sshbuf_new()) == NULL)
373: fatal("%s: sshbuf_new failed", __func__);
374: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
375: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
376: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 377:
1.103 markus 378: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 379:
1.103 markus 380: sshbuf_free(m);
1.1 provos 381: }
382:
383: /* Do the password authentication */
384: int
1.99 djm 385: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 386: {
1.103 markus 387: struct sshbuf *m;
388: int r, authenticated = 0;
1.1 provos 389:
1.8 markus 390: debug3("%s entering", __func__);
1.1 provos 391:
1.103 markus 392: if ((m = sshbuf_new()) == NULL)
393: fatal("%s: sshbuf_new failed", __func__);
394: if ((r = sshbuf_put_cstring(m, password)) != 0)
395: fatal("%s: buffer error: %s", __func__, ssh_err(r));
396: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 397:
1.8 markus 398: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 399: mm_request_receive_expect(pmonitor->m_recvfd,
400: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 401:
1.103 markus 402: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
403: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 404:
1.103 markus 405: sshbuf_free(m);
1.1 provos 406:
1.3 markus 407: debug3("%s: user %sauthenticated",
1.8 markus 408: __func__, authenticated ? "" : "not ");
1.1 provos 409: return (authenticated);
410: }
411:
412: int
1.99 djm 413: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
414: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 415: {
1.85 djm 416: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 417: pubkey_auth_attempt, authoptp));
1.1 provos 418: }
419:
420: int
1.111 ! djm 421: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
! 422: const char *user, const char *host, struct sshkey *key)
1.1 provos 423: {
1.99 djm 424: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 425: }
426:
427: int
1.88 djm 428: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 429: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 430: {
1.103 markus 431: struct sshbuf *m;
1.99 djm 432: int r, allowed = 0;
433: struct sshauthopt *opts = NULL;
1.1 provos 434:
1.8 markus 435: debug3("%s entering", __func__);
1.1 provos 436:
1.99 djm 437: if (authoptp != NULL)
438: *authoptp = NULL;
439:
1.103 markus 440: if ((m = sshbuf_new()) == NULL)
441: fatal("%s: sshbuf_new failed", __func__);
442: if ((r = sshbuf_put_u32(m, type)) != 0 ||
443: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
444: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
445: (r = sshkey_puts(key, m)) != 0 ||
446: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
447: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 448:
1.103 markus 449: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 450:
1.8 markus 451: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 452: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 453: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 454:
1.103 markus 455: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
456: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 457: if (allowed && type == MM_USERKEY) {
1.103 markus 458: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 459: fatal("%s: sshauthopt_deserialise: %s",
460: __func__, ssh_err(r));
461: }
1.103 markus 462: sshbuf_free(m);
1.1 provos 463:
1.99 djm 464: if (authoptp != NULL) {
465: *authoptp = opts;
466: opts = NULL;
467: }
468: sshauthopt_free(opts);
1.1 provos 469:
1.99 djm 470: return allowed;
1.1 provos 471: }
472:
1.3 markus 473: /*
1.1 provos 474: * This key verify needs to send the key type along, because the
475: * privileged parent makes the decision if the key is allowed
476: * for authentication.
477: */
478:
479: int
1.92 markus 480: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.96 djm 481: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
1.1 provos 482: {
1.103 markus 483: struct sshbuf *m;
1.92 markus 484: u_int encoded_ret = 0;
1.103 markus 485: int r;
1.1 provos 486:
1.8 markus 487: debug3("%s entering", __func__);
1.1 provos 488:
489:
1.103 markus 490: if ((m = sshbuf_new()) == NULL)
491: fatal("%s: sshbuf_new failed", __func__);
492: if ((r = sshkey_puts(key, m)) != 0 ||
493: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
494: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
495: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
496: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 497:
1.103 markus 498: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 499:
1.8 markus 500: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.103 markus 501: mm_request_receive_expect(pmonitor->m_recvfd,
502: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 503:
1.103 markus 504: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0)
505: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 506:
1.103 markus 507: sshbuf_free(m);
1.1 provos 508:
1.92 markus 509: if (encoded_ret != 0)
510: return SSH_ERR_SIGNATURE_INVALID;
511: return 0;
1.1 provos 512: }
513:
514: void
1.111 ! djm 515: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 516: {
1.82 markus 517: struct sshbuf *m;
518: int r;
519:
520: if ((m = sshbuf_new()) == NULL)
521: fatal("%s: sshbuf_new failed", __func__);
522: if ((r = ssh_packet_get_state(ssh, m)) != 0)
523: fatal("%s: get_state failed: %s",
524: __func__, ssh_err(r));
525: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 526: debug3("%s: Finished sending state", __func__);
1.82 markus 527: sshbuf_free(m);
1.1 provos 528: }
529:
530: int
1.42 deraadt 531: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 532: {
1.103 markus 533: struct sshbuf *m;
1.39 dtucker 534: char *p, *msg;
1.102 markus 535: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 536:
537: /* Kludge: ensure there are fds free to receive the pty/tty */
538: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
539: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
540: error("%s: cannot allocate fds for pty", __func__);
541: if (tmp1 > 0)
542: close(tmp1);
543: if (tmp2 > 0)
544: close(tmp2);
545: return 0;
546: }
547: close(tmp1);
548: close(tmp2);
1.1 provos 549:
1.103 markus 550: if ((m = sshbuf_new()) == NULL)
551: fatal("%s: sshbuf_new failed", __func__);
552: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 553:
1.8 markus 554: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 555: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 556:
1.103 markus 557: if ((r = sshbuf_get_u32(m, &success)) != 0)
558: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 559: if (success == 0) {
1.8 markus 560: debug3("%s: pty alloc failed", __func__);
1.103 markus 561: sshbuf_free(m);
1.1 provos 562: return (0);
563: }
1.103 markus 564: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
565: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
566: fatal("%s: buffer error: %s", __func__, ssh_err(r));
567: sshbuf_free(m);
1.1 provos 568:
569: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 570: free(p);
1.39 dtucker 571:
1.102 markus 572: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
573: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 574: free(msg);
1.1 provos 575:
1.58 djm 576: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
577: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
578: fatal("%s: receive fds failed", __func__);
1.1 provos 579:
580: /* Success */
581: return (1);
582: }
583:
584: void
1.32 markus 585: mm_session_pty_cleanup2(Session *s)
1.1 provos 586: {
1.103 markus 587: struct sshbuf *m;
588: int r;
1.1 provos 589:
590: if (s->ttyfd == -1)
591: return;
1.103 markus 592: if ((m = sshbuf_new()) == NULL)
593: fatal("%s: sshbuf_new failed", __func__);
594: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
595: fatal("%s: buffer error: %s", __func__, ssh_err(r));
596: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
597: sshbuf_free(m);
1.3 markus 598:
1.1 provos 599: /* closed dup'ed master */
1.62 djm 600: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
601: error("close(s->ptymaster/%d): %s",
602: s->ptymaster, strerror(errno));
1.1 provos 603:
604: /* unlink pty from session */
605: s->ttyfd = -1;
606: }
607:
608: /* Request process termination */
609:
610: void
611: mm_terminate(void)
612: {
1.103 markus 613: struct sshbuf *m;
1.1 provos 614:
1.103 markus 615: if ((m = sshbuf_new()) == NULL)
616: fatal("%s: sshbuf_new failed", __func__);
617: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
618: sshbuf_free(m);
1.1 provos 619: }
620:
1.2 markus 621: static void
1.1 provos 622: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
623: char ***prompts, u_int **echo_on)
624: {
1.10 deraadt 625: *name = xstrdup("");
626: *infotxt = xstrdup("");
1.1 provos 627: *numprompts = 1;
1.43 djm 628: *prompts = xcalloc(*numprompts, sizeof(char *));
629: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 630: (*echo_on)[0] = 0;
631: }
632:
633: int
634: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
635: u_int *numprompts, char ***prompts, u_int **echo_on)
636: {
1.103 markus 637: struct sshbuf *m;
1.21 markus 638: u_int success;
1.1 provos 639: char *challenge;
1.103 markus 640: int r;
1.1 provos 641:
1.8 markus 642: debug3("%s: entering", __func__);
1.1 provos 643:
1.103 markus 644: if ((m = sshbuf_new()) == NULL)
645: fatal("%s: sshbuf_new failed", __func__);
646: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 647:
1.103 markus 648: mm_request_receive_expect(pmonitor->m_recvfd,
649: MONITOR_ANS_BSDAUTHQUERY, m);
650: if ((r = sshbuf_get_u32(m, &success)) != 0)
651: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 652: if (success == 0) {
1.8 markus 653: debug3("%s: no challenge", __func__);
1.103 markus 654: sshbuf_free(m);
1.1 provos 655: return (-1);
656: }
657:
658: /* Get the challenge, and format the response */
1.103 markus 659: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
660: fatal("%s: buffer error: %s", __func__, ssh_err(r));
661: sshbuf_free(m);
1.1 provos 662:
663: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
664: (*prompts)[0] = challenge;
665:
1.8 markus 666: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 667:
668: return (0);
669: }
670:
671: int
672: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
673: {
1.103 markus 674: struct sshbuf *m;
675: int r, authok;
1.1 provos 676:
1.8 markus 677: debug3("%s: entering", __func__);
1.1 provos 678: if (numresponses != 1)
679: return (-1);
680:
1.103 markus 681: if ((m = sshbuf_new()) == NULL)
682: fatal("%s: sshbuf_new failed", __func__);
683: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
684: fatal("%s: buffer error: %s", __func__, ssh_err(r));
685: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 686:
1.7 mouring 687: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 688: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 689:
1.103 markus 690: if ((r = sshbuf_get_u32(m, &authok)) != 0)
691: fatal("%s: buffer error: %s", __func__, ssh_err(r));
692: sshbuf_free(m);
1.1 provos 693:
694: return ((authok == 0) ? -1 : 0);
695: }
1.29 markus 696:
697: #ifdef GSSAPI
698: OM_uint32
1.36 avsm 699: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 700: {
1.103 markus 701: struct sshbuf *m;
1.29 markus 702: OM_uint32 major;
1.103 markus 703: int r;
1.29 markus 704:
705: /* Client doesn't get to see the context */
706: *ctx = NULL;
707:
1.103 markus 708: if ((m = sshbuf_new()) == NULL)
709: fatal("%s: sshbuf_new failed", __func__);
710: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
711: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 712:
1.103 markus 713: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
714: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 715:
1.103 markus 716: if ((r = sshbuf_get_u32(m, &major)) != 0)
717: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 718:
1.103 markus 719: sshbuf_free(m);
1.29 markus 720: return (major);
721: }
722:
723: OM_uint32
724: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 725: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 726: {
1.103 markus 727: struct sshbuf *m;
1.29 markus 728: OM_uint32 major;
1.103 markus 729: u_int flags;
730: int r;
1.29 markus 731:
1.103 markus 732: if ((m = sshbuf_new()) == NULL)
733: fatal("%s: sshbuf_new failed", __func__);
734: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
735: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 736:
1.103 markus 737: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
738: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 739:
1.103 markus 740: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 741: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 742: fatal("%s: buffer error: %s", __func__, ssh_err(r));
743: if (flagsp != NULL) {
744: if ((r = sshbuf_get_u32(m, &flags)) != 0)
745: fatal("%s: buffer error: %s", __func__, ssh_err(r));
746: *flagsp = flags;
747: }
1.29 markus 748:
1.103 markus 749: sshbuf_free(m);
1.29 markus 750:
751: return (major);
1.35 markus 752: }
753:
754: OM_uint32
755: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
756: {
1.103 markus 757: struct sshbuf *m;
1.35 markus 758: OM_uint32 major;
1.103 markus 759: int r;
760:
761: if ((m = sshbuf_new()) == NULL)
762: fatal("%s: sshbuf_new failed", __func__);
763: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
764: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
765: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 766:
1.103 markus 767: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
768: mm_request_receive_expect(pmonitor->m_recvfd,
769: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 770:
1.103 markus 771: if ((r = sshbuf_get_u32(m, &major)) != 0)
772: fatal("%s: buffer error: %s", __func__, ssh_err(r));
773: sshbuf_free(m);
1.35 markus 774: return(major);
1.29 markus 775: }
776:
777: int
778: mm_ssh_gssapi_userok(char *user)
779: {
1.103 markus 780: struct sshbuf *m;
781: int r, authenticated = 0;
1.29 markus 782:
1.103 markus 783: if ((m = sshbuf_new()) == NULL)
784: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 785:
1.103 markus 786: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
787: mm_request_receive_expect(pmonitor->m_recvfd,
788: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 789:
1.103 markus 790: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
791: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 792:
1.103 markus 793: sshbuf_free(m);
1.29 markus 794: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
795: return (authenticated);
796: }
797: #endif /* GSSAPI */
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