Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.107
1.107 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.106 2018/07/11 18:53:29 markus 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"
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
1.106 markus 216: mm_sshkey_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
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;
221: u_int ndx = kex->host_key_index(key, 0, active_state);
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 *
1.37 dtucker 246: mm_getpwnamallow(const char *username)
1.1 provos 247: {
1.93 djm 248: struct ssh *ssh = active_state; /* XXX */
1.103 markus 249: struct sshbuf *m;
1.1 provos 250: struct passwd *pw;
1.103 markus 251: size_t len;
252: u_int i;
1.55 dtucker 253: ServerOptions *newopts;
1.103 markus 254: int r;
255: u_char ok;
256: const u_char *p;
1.1 provos 257:
1.8 markus 258: debug3("%s entering", __func__);
1.1 provos 259:
1.103 markus 260: if ((m = sshbuf_new()) == NULL)
261: fatal("%s: sshbuf_new failed", __func__);
262: if ((r = sshbuf_put_cstring(m, username)) != 0)
263: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 264:
1.103 markus 265: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 266:
1.8 markus 267: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.103 markus 268: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 269:
1.103 markus 270: if ((r = sshbuf_get_u8(m, &ok)) != 0)
271: fatal("%s: buffer error: %s", __func__, ssh_err(r));
272: if (ok == 0) {
1.60 dtucker 273: pw = NULL;
274: goto out;
1.1 provos 275: }
1.103 markus 276:
277: /* XXX don't like passing struct passwd like this */
278: pw = xcalloc(sizeof(*pw), 1);
279: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
280: fatal("%s: buffer error: %s", __func__, ssh_err(r));
281: if (len != sizeof(*pw))
1.8 markus 282: fatal("%s: struct passwd size mismatch", __func__);
1.103 markus 283: memcpy(pw, p, sizeof(*pw));
284:
285: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
286: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
287: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
288: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
289: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
290: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
291: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 292:
1.60 dtucker 293: out:
1.55 dtucker 294: /* copy options block as a Match directive may have changed some */
1.103 markus 295: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
296: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.55 dtucker 297: if (len != sizeof(*newopts))
298: fatal("%s: option block size mismatch", __func__);
1.103 markus 299: newopts = xcalloc(sizeof(*newopts), 1);
300: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 301:
302: #define M_CP_STROPT(x) do { \
1.103 markus 303: if (newopts->x != NULL) { \
304: if ((r = sshbuf_get_cstring(m, \
305: &newopts->x, NULL)) != 0) \
306: fatal("%s: buffer error: %s", \
307: __func__, ssh_err(r)); \
308: } \
1.71 djm 309: } while (0)
1.72 djm 310: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 311: newopts->x = newopts->nx == 0 ? \
312: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 313: for (i = 0; i < newopts->nx; i++) { \
314: if ((r = sshbuf_get_cstring(m, \
315: &newopts->x[i], NULL)) != 0) \
316: fatal("%s: buffer error: %s", \
317: __func__, ssh_err(r)); \
318: } \
1.72 djm 319: } while (0)
1.71 djm 320: /* See comment in servconf.h */
321: COPY_MATCH_STRING_OPTS();
322: #undef M_CP_STROPT
1.72 djm 323: #undef M_CP_STRARRAYOPT
1.71 djm 324:
1.55 dtucker 325: copy_set_server_options(&options, newopts, 1);
1.90 djm 326: log_change_level(options.log_level);
1.93 djm 327: process_permitopen(ssh, &options);
1.76 djm 328: free(newopts);
1.55 dtucker 329:
1.103 markus 330: sshbuf_free(m);
1.1 provos 331:
332: return (pw);
1.6 djm 333: }
334:
1.33 markus 335: char *
336: mm_auth2_read_banner(void)
1.6 djm 337: {
1.103 markus 338: struct sshbuf *m;
1.6 djm 339: char *banner;
1.103 markus 340: int r;
1.6 djm 341:
1.8 markus 342: debug3("%s entering", __func__);
1.6 djm 343:
1.103 markus 344: if ((m = sshbuf_new()) == NULL)
345: fatal("%s: sshbuf_new failed", __func__);
346: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
347: sshbuf_reset(m);
1.6 djm 348:
1.33 markus 349: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 350: MONITOR_ANS_AUTH2_READ_BANNER, m);
351: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
352: fatal("%s: buffer error: %s", __func__, ssh_err(r));
353: sshbuf_free(m);
1.10 deraadt 354:
1.33 markus 355: /* treat empty banner as missing banner */
356: if (strlen(banner) == 0) {
1.76 djm 357: free(banner);
1.33 markus 358: banner = NULL;
359: }
1.6 djm 360: return (banner);
1.1 provos 361: }
362:
363: /* Inform the privileged process about service and style */
364:
365: void
366: mm_inform_authserv(char *service, char *style)
367: {
1.103 markus 368: struct sshbuf *m;
369: int r;
1.1 provos 370:
1.8 markus 371: debug3("%s entering", __func__);
1.1 provos 372:
1.103 markus 373: if ((m = sshbuf_new()) == NULL)
374: fatal("%s: sshbuf_new failed", __func__);
375: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
376: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
377: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 378:
1.103 markus 379: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 380:
1.103 markus 381: sshbuf_free(m);
1.1 provos 382: }
383:
384: /* Do the password authentication */
385: int
1.99 djm 386: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 387: {
1.103 markus 388: struct sshbuf *m;
389: int r, authenticated = 0;
1.1 provos 390:
1.8 markus 391: debug3("%s entering", __func__);
1.1 provos 392:
1.103 markus 393: if ((m = sshbuf_new()) == NULL)
394: fatal("%s: sshbuf_new failed", __func__);
395: if ((r = sshbuf_put_cstring(m, password)) != 0)
396: fatal("%s: buffer error: %s", __func__, ssh_err(r));
397: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 398:
1.8 markus 399: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.103 markus 400: mm_request_receive_expect(pmonitor->m_recvfd,
401: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 402:
1.103 markus 403: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
404: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 405:
1.103 markus 406: sshbuf_free(m);
1.1 provos 407:
1.3 markus 408: debug3("%s: user %sauthenticated",
1.8 markus 409: __func__, authenticated ? "" : "not ");
1.1 provos 410: return (authenticated);
411: }
412:
413: int
1.99 djm 414: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
415: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 416: {
1.85 djm 417: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 418: pubkey_auth_attempt, authoptp));
1.1 provos 419: }
420:
421: int
1.88 djm 422: mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host,
1.91 markus 423: struct sshkey *key)
1.1 provos 424: {
1.99 djm 425: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 426: }
427:
428: int
1.88 djm 429: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 430: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 431: {
1.103 markus 432: struct sshbuf *m;
1.99 djm 433: int r, allowed = 0;
434: struct sshauthopt *opts = NULL;
1.1 provos 435:
1.8 markus 436: debug3("%s entering", __func__);
1.1 provos 437:
1.99 djm 438: if (authoptp != NULL)
439: *authoptp = NULL;
440:
1.103 markus 441: if ((m = sshbuf_new()) == NULL)
442: fatal("%s: sshbuf_new failed", __func__);
443: if ((r = sshbuf_put_u32(m, type)) != 0 ||
444: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
445: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
446: (r = sshkey_puts(key, m)) != 0 ||
447: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
448: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 449:
1.103 markus 450: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 451:
1.8 markus 452: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 453: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 454: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 455:
1.103 markus 456: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
457: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.99 djm 458: if (allowed && type == MM_USERKEY) {
1.103 markus 459: if ((r = sshauthopt_deserialise(m, &opts)) != 0)
1.99 djm 460: fatal("%s: sshauthopt_deserialise: %s",
461: __func__, ssh_err(r));
462: }
1.103 markus 463: sshbuf_free(m);
1.1 provos 464:
1.99 djm 465: if (authoptp != NULL) {
466: *authoptp = opts;
467: opts = NULL;
468: }
469: sshauthopt_free(opts);
1.1 provos 470:
1.99 djm 471: return allowed;
1.1 provos 472: }
473:
1.3 markus 474: /*
1.1 provos 475: * This key verify needs to send the key type along, because the
476: * privileged parent makes the decision if the key is allowed
477: * for authentication.
478: */
479:
480: int
1.92 markus 481: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.96 djm 482: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
1.1 provos 483: {
1.103 markus 484: struct sshbuf *m;
1.92 markus 485: u_int encoded_ret = 0;
1.103 markus 486: int r;
1.1 provos 487:
1.8 markus 488: debug3("%s entering", __func__);
1.1 provos 489:
490:
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:
1.103 markus 505: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0)
506: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 507:
1.103 markus 508: sshbuf_free(m);
1.1 provos 509:
1.92 markus 510: if (encoded_ret != 0)
511: return SSH_ERR_SIGNATURE_INVALID;
512: return 0;
1.1 provos 513: }
514:
515: void
1.36 avsm 516: mm_send_keystate(struct monitor *monitor)
1.1 provos 517: {
1.82 markus 518: struct ssh *ssh = active_state; /* XXX */
519: struct sshbuf *m;
520: int r;
521:
522: if ((m = sshbuf_new()) == NULL)
523: fatal("%s: sshbuf_new failed", __func__);
524: if ((r = ssh_packet_get_state(ssh, m)) != 0)
525: fatal("%s: get_state failed: %s",
526: __func__, ssh_err(r));
527: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 528: debug3("%s: Finished sending state", __func__);
1.82 markus 529: sshbuf_free(m);
1.1 provos 530: }
531:
532: int
1.42 deraadt 533: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 534: {
1.103 markus 535: struct sshbuf *m;
1.39 dtucker 536: char *p, *msg;
1.102 markus 537: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 538:
539: /* Kludge: ensure there are fds free to receive the pty/tty */
540: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
541: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
542: error("%s: cannot allocate fds for pty", __func__);
543: if (tmp1 > 0)
544: close(tmp1);
545: if (tmp2 > 0)
546: close(tmp2);
547: return 0;
548: }
549: close(tmp1);
550: close(tmp2);
1.1 provos 551:
1.103 markus 552: if ((m = sshbuf_new()) == NULL)
553: fatal("%s: sshbuf_new failed", __func__);
554: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 555:
1.8 markus 556: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.103 markus 557: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 558:
1.103 markus 559: if ((r = sshbuf_get_u32(m, &success)) != 0)
560: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 provos 561: if (success == 0) {
1.8 markus 562: debug3("%s: pty alloc failed", __func__);
1.103 markus 563: sshbuf_free(m);
1.1 provos 564: return (0);
565: }
1.103 markus 566: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
567: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
568: fatal("%s: buffer error: %s", __func__, ssh_err(r));
569: sshbuf_free(m);
1.1 provos 570:
571: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 572: free(p);
1.39 dtucker 573:
1.102 markus 574: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
575: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.76 djm 576: free(msg);
1.1 provos 577:
1.58 djm 578: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
579: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
580: fatal("%s: receive fds failed", __func__);
1.1 provos 581:
582: /* Success */
583: return (1);
584: }
585:
586: void
1.32 markus 587: mm_session_pty_cleanup2(Session *s)
1.1 provos 588: {
1.103 markus 589: struct sshbuf *m;
590: int r;
1.1 provos 591:
592: if (s->ttyfd == -1)
593: return;
1.103 markus 594: if ((m = sshbuf_new()) == NULL)
595: fatal("%s: sshbuf_new failed", __func__);
596: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
597: fatal("%s: buffer error: %s", __func__, ssh_err(r));
598: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
599: sshbuf_free(m);
1.3 markus 600:
1.1 provos 601: /* closed dup'ed master */
1.62 djm 602: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
603: error("close(s->ptymaster/%d): %s",
604: s->ptymaster, strerror(errno));
1.1 provos 605:
606: /* unlink pty from session */
607: s->ttyfd = -1;
608: }
609:
610: /* Request process termination */
611:
612: void
613: mm_terminate(void)
614: {
1.103 markus 615: struct sshbuf *m;
1.1 provos 616:
1.103 markus 617: if ((m = sshbuf_new()) == NULL)
618: fatal("%s: sshbuf_new failed", __func__);
619: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
620: sshbuf_free(m);
1.1 provos 621: }
622:
1.2 markus 623: static void
1.1 provos 624: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
625: char ***prompts, u_int **echo_on)
626: {
1.10 deraadt 627: *name = xstrdup("");
628: *infotxt = xstrdup("");
1.1 provos 629: *numprompts = 1;
1.43 djm 630: *prompts = xcalloc(*numprompts, sizeof(char *));
631: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 632: (*echo_on)[0] = 0;
633: }
634:
635: int
636: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
637: u_int *numprompts, char ***prompts, u_int **echo_on)
638: {
1.103 markus 639: struct sshbuf *m;
1.21 markus 640: u_int success;
1.1 provos 641: char *challenge;
1.103 markus 642: int r;
1.1 provos 643:
1.8 markus 644: debug3("%s: entering", __func__);
1.1 provos 645:
1.103 markus 646: if ((m = sshbuf_new()) == NULL)
647: fatal("%s: sshbuf_new failed", __func__);
648: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 649:
1.103 markus 650: mm_request_receive_expect(pmonitor->m_recvfd,
651: MONITOR_ANS_BSDAUTHQUERY, m);
652: if ((r = sshbuf_get_u32(m, &success)) != 0)
653: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 654: if (success == 0) {
1.8 markus 655: debug3("%s: no challenge", __func__);
1.103 markus 656: sshbuf_free(m);
1.1 provos 657: return (-1);
658: }
659:
660: /* Get the challenge, and format the response */
1.103 markus 661: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
662: fatal("%s: buffer error: %s", __func__, ssh_err(r));
663: sshbuf_free(m);
1.1 provos 664:
665: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
666: (*prompts)[0] = challenge;
667:
1.8 markus 668: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 669:
670: return (0);
671: }
672:
673: int
674: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
675: {
1.103 markus 676: struct sshbuf *m;
677: int r, authok;
1.1 provos 678:
1.8 markus 679: debug3("%s: entering", __func__);
1.1 provos 680: if (numresponses != 1)
681: return (-1);
682:
1.103 markus 683: if ((m = sshbuf_new()) == NULL)
684: fatal("%s: sshbuf_new failed", __func__);
685: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
686: fatal("%s: buffer error: %s", __func__, ssh_err(r));
687: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 688:
1.7 mouring 689: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 690: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 691:
1.103 markus 692: if ((r = sshbuf_get_u32(m, &authok)) != 0)
693: fatal("%s: buffer error: %s", __func__, ssh_err(r));
694: sshbuf_free(m);
1.1 provos 695:
696: return ((authok == 0) ? -1 : 0);
697: }
1.29 markus 698:
699: #ifdef GSSAPI
700: OM_uint32
1.36 avsm 701: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 702: {
1.103 markus 703: struct sshbuf *m;
1.29 markus 704: OM_uint32 major;
1.103 markus 705: int r;
1.29 markus 706:
707: /* Client doesn't get to see the context */
708: *ctx = NULL;
709:
1.103 markus 710: if ((m = sshbuf_new()) == NULL)
711: fatal("%s: sshbuf_new failed", __func__);
712: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
713: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 714:
1.103 markus 715: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
716: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 717:
1.103 markus 718: if ((r = sshbuf_get_u32(m, &major)) != 0)
719: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 720:
1.103 markus 721: sshbuf_free(m);
1.29 markus 722: return (major);
723: }
724:
725: OM_uint32
726: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 727: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 728: {
1.103 markus 729: struct sshbuf *m;
1.29 markus 730: OM_uint32 major;
1.103 markus 731: u_int flags;
732: int r;
1.29 markus 733:
1.103 markus 734: if ((m = sshbuf_new()) == NULL)
735: fatal("%s: sshbuf_new failed", __func__);
736: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
737: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 738:
1.103 markus 739: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
740: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 741:
1.103 markus 742: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 743: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.103 markus 744: fatal("%s: buffer error: %s", __func__, ssh_err(r));
745: if (flagsp != NULL) {
746: if ((r = sshbuf_get_u32(m, &flags)) != 0)
747: fatal("%s: buffer error: %s", __func__, ssh_err(r));
748: *flagsp = flags;
749: }
1.29 markus 750:
1.103 markus 751: sshbuf_free(m);
1.29 markus 752:
753: return (major);
1.35 markus 754: }
755:
756: OM_uint32
757: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
758: {
1.103 markus 759: struct sshbuf *m;
1.35 markus 760: OM_uint32 major;
1.103 markus 761: int r;
762:
763: if ((m = sshbuf_new()) == NULL)
764: fatal("%s: sshbuf_new failed", __func__);
765: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
766: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
767: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.35 markus 768:
1.103 markus 769: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
770: mm_request_receive_expect(pmonitor->m_recvfd,
771: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 772:
1.103 markus 773: if ((r = sshbuf_get_u32(m, &major)) != 0)
774: fatal("%s: buffer error: %s", __func__, ssh_err(r));
775: sshbuf_free(m);
1.35 markus 776: return(major);
1.29 markus 777: }
778:
779: int
780: mm_ssh_gssapi_userok(char *user)
781: {
1.103 markus 782: struct sshbuf *m;
783: int r, authenticated = 0;
1.29 markus 784:
1.103 markus 785: if ((m = sshbuf_new()) == NULL)
786: fatal("%s: sshbuf_new failed", __func__);
1.29 markus 787:
1.103 markus 788: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
789: mm_request_receive_expect(pmonitor->m_recvfd,
790: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 791:
1.103 markus 792: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
793: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.29 markus 794:
1.103 markus 795: sshbuf_free(m);
1.29 markus 796: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
797: return (authenticated);
798: }
799: #endif /* GSSAPI */
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