Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.125
1.125 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.124 2022/05/27 05:01:25 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
1.123 markus 81: mm_log_handler(LogLevel level, int forced, const char *msg, void *ctx)
1.73 djm 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)
1.121 djm 89: fatal_f("no log channel");
1.73 djm 90:
1.103 markus 91: if ((log_msg = sshbuf_new()) == NULL)
1.121 djm 92: fatal_f("sshbuf_new failed");
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 ||
1.123 markus 96: (r = sshbuf_put_u32(log_msg, forced)) != 0 ||
1.103 markus 97: (r = sshbuf_put_cstring(log_msg, msg)) != 0)
1.121 djm 98: fatal_fr(r, "assemble");
1.103 markus 99: if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
1.121 djm 100: fatal_f("bad length %zu", len);
1.103 markus 101: POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4);
102: if (atomicio(vwrite, mon->m_log_sendfd,
103: sshbuf_mutable_ptr(log_msg), len) != len)
1.121 djm 104: fatal_f("write: %s", strerror(errno));
1.103 markus 105: sshbuf_free(log_msg);
1.73 djm 106: }
1.1 provos 107:
1.32 markus 108: int
109: mm_is_monitor(void)
110: {
111: /*
112: * m_pid is only set in the privileged part, and
113: * points to the unprivileged child.
114: */
1.34 markus 115: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 116: }
117:
1.1 provos 118: void
1.103 markus 119: mm_request_send(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 120: {
1.103 markus 121: size_t mlen = sshbuf_len(m);
1.1 provos 122: u_char buf[5];
123:
1.121 djm 124: debug3_f("entering, type %d", type);
1.1 provos 125:
1.103 markus 126: if (mlen >= 0xffffffff)
1.121 djm 127: fatal_f("bad length %zu", mlen);
1.103 markus 128: POKE_U32(buf, mlen + 1);
1.10 deraadt 129: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 130: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.121 djm 131: fatal_f("write: %s", strerror(errno));
1.103 markus 132: if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen)
1.121 djm 133: fatal_f("write: %s", strerror(errno));
1.1 provos 134: }
135:
136: void
1.103 markus 137: mm_request_receive(int sock, struct sshbuf *m)
1.1 provos 138: {
1.103 markus 139: u_char buf[4], *p = NULL;
1.13 deraadt 140: u_int msg_len;
1.103 markus 141: int r;
1.1 provos 142:
1.121 djm 143: debug3_f("entering");
1.1 provos 144:
1.40 avsm 145: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
146: if (errno == EPIPE)
1.32 markus 147: cleanup_exit(255);
1.121 djm 148: fatal_f("read: %s", strerror(errno));
1.1 provos 149: }
1.103 markus 150: msg_len = PEEK_U32(buf);
1.1 provos 151: if (msg_len > 256 * 1024)
1.121 djm 152: fatal_f("read: bad msg_len %d", msg_len);
1.103 markus 153: sshbuf_reset(m);
154: if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
1.121 djm 155: fatal_fr(r, "reserve");
1.103 markus 156: if (atomicio(read, sock, p, msg_len) != msg_len)
1.121 djm 157: fatal_f("read: %s", strerror(errno));
1.1 provos 158: }
159:
160: void
1.103 markus 161: mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 162: {
163: u_char rtype;
1.103 markus 164: int r;
1.1 provos 165:
1.121 djm 166: debug3_f("entering, type %d", type);
1.1 provos 167:
1.36 avsm 168: mm_request_receive(sock, m);
1.103 markus 169: if ((r = sshbuf_get_u8(m, &rtype)) != 0)
1.121 djm 170: fatal_fr(r, "parse");
1.1 provos 171: if (rtype != type)
1.121 djm 172: fatal_f("read: rtype %d != type %d", rtype, type);
1.1 provos 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)
1.121 djm 185: fatal_f("sshbuf_new failed");
1.103 markus 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)
1.121 djm 189: fatal_fr(r, "assemble");
1.1 provos 190:
1.103 markus 191: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
1.1 provos 192:
1.121 djm 193: debug3_f("waiting for MONITOR_ANS_MODULI");
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)
1.121 djm 197: fatal_fr(r, "parse success");
1.1 provos 198: if (success == 0)
1.121 djm 199: fatal_f("MONITOR_ANS_MODULI failed");
1.1 provos 200:
1.112 djm 201: if ((r = sshbuf_get_bignum2(m, &p)) != 0 ||
202: (r = sshbuf_get_bignum2(m, &g)) != 0)
1.121 djm 203: fatal_fr(r, "parse group");
1.1 provos 204:
1.121 djm 205: debug3_f("remaining %zu", sshbuf_len(m));
1.103 markus 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:
1.121 djm 222: debug3_f("entering");
1.103 markus 223: if ((m = sshbuf_new()) == NULL)
1.121 djm 224: fatal_f("sshbuf_new failed");
1.103 markus 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)
1.121 djm 229: fatal_fr(r, "assemble");
1.1 provos 230:
1.103 markus 231: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 232:
1.121 djm 233: debug3_f("waiting for MONITOR_ANS_SIGN");
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)
1.121 djm 236: fatal_fr(r, "parse");
1.103 markus 237: sshbuf_free(m);
1.1 provos 238:
239: return (0);
240: }
241:
1.122 djm 242: #define GETPW(b, id) \
243: do { \
244: if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0) \
245: fatal_fr(r, "parse pw %s", #id); \
246: if (len != sizeof(pw->id)) \
247: fatal_fr(r, "bad length for %s", #id); \
248: memcpy(&pw->id, p, len); \
249: } while (0)
250:
1.1 provos 251: struct passwd *
1.109 djm 252: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 253: {
1.103 markus 254: struct sshbuf *m;
1.1 provos 255: struct passwd *pw;
1.103 markus 256: size_t len;
257: u_int i;
1.55 dtucker 258: ServerOptions *newopts;
1.103 markus 259: int r;
260: u_char ok;
261: const u_char *p;
1.1 provos 262:
1.121 djm 263: debug3_f("entering");
1.1 provos 264:
1.103 markus 265: if ((m = sshbuf_new()) == NULL)
1.121 djm 266: fatal_f("sshbuf_new failed");
1.103 markus 267: if ((r = sshbuf_put_cstring(m, username)) != 0)
1.121 djm 268: fatal_fr(r, "assemble");
1.1 provos 269:
1.103 markus 270: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 271:
1.121 djm 272: debug3_f("waiting for MONITOR_ANS_PWNAM");
1.103 markus 273: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 274:
1.103 markus 275: if ((r = sshbuf_get_u8(m, &ok)) != 0)
1.121 djm 276: fatal_fr(r, "parse success");
1.103 markus 277: if (ok == 0) {
1.60 dtucker 278: pw = NULL;
279: goto out;
1.1 provos 280: }
1.103 markus 281:
282: pw = xcalloc(sizeof(*pw), 1);
1.122 djm 283: GETPW(m, pw_uid);
284: GETPW(m, pw_gid);
285: GETPW(m, pw_change);
286: GETPW(m, pw_expire);
1.103 markus 287: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
288: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
289: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
290: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
291: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
292: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
1.121 djm 293: fatal_fr(r, "parse pw");
1.55 dtucker 294:
1.60 dtucker 295: out:
1.55 dtucker 296: /* copy options block as a Match directive may have changed some */
1.103 markus 297: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
1.121 djm 298: fatal_fr(r, "parse opts");
1.55 dtucker 299: if (len != sizeof(*newopts))
1.121 djm 300: fatal_f("option block size mismatch");
1.103 markus 301: newopts = xcalloc(sizeof(*newopts), 1);
302: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 303:
304: #define M_CP_STROPT(x) do { \
1.121 djm 305: if (newopts->x != NULL && \
306: (r = sshbuf_get_cstring(m, &newopts->x, NULL)) != 0) \
307: fatal_fr(r, "parse %s", #x); \
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) \
1.121 djm 315: fatal_fr(r, "parse %s", #x); \
1.103 markus 316: } \
1.72 djm 317: } while (0)
1.71 djm 318: /* See comment in servconf.h */
319: COPY_MATCH_STRING_OPTS();
320: #undef M_CP_STROPT
1.72 djm 321: #undef M_CP_STRARRAYOPT
1.71 djm 322:
1.55 dtucker 323: copy_set_server_options(&options, newopts, 1);
1.90 djm 324: log_change_level(options.log_level);
1.120 djm 325: log_verbose_reset();
326: for (i = 0; i < options.num_log_verbose; i++)
327: log_verbose_add(options.log_verbose[i]);
1.93 djm 328: process_permitopen(ssh, &options);
1.76 djm 329: free(newopts);
1.55 dtucker 330:
1.103 markus 331: sshbuf_free(m);
1.1 provos 332:
333: return (pw);
1.6 djm 334: }
335:
1.33 markus 336: char *
337: mm_auth2_read_banner(void)
1.6 djm 338: {
1.103 markus 339: struct sshbuf *m;
1.6 djm 340: char *banner;
1.103 markus 341: int r;
1.6 djm 342:
1.121 djm 343: debug3_f("entering");
1.6 djm 344:
1.103 markus 345: if ((m = sshbuf_new()) == NULL)
1.121 djm 346: fatal_f("sshbuf_new failed");
1.103 markus 347: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
348: sshbuf_reset(m);
1.6 djm 349:
1.33 markus 350: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 351: MONITOR_ANS_AUTH2_READ_BANNER, m);
352: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
1.121 djm 353: fatal_fr(r, "parse");
1.103 markus 354: sshbuf_free(m);
1.10 deraadt 355:
1.33 markus 356: /* treat empty banner as missing banner */
357: if (strlen(banner) == 0) {
1.76 djm 358: free(banner);
1.33 markus 359: banner = NULL;
360: }
1.6 djm 361: return (banner);
1.1 provos 362: }
363:
364: /* Inform the privileged process about service and style */
365:
366: void
367: mm_inform_authserv(char *service, char *style)
368: {
1.103 markus 369: struct sshbuf *m;
370: int r;
1.1 provos 371:
1.121 djm 372: debug3_f("entering");
1.1 provos 373:
1.103 markus 374: if ((m = sshbuf_new()) == NULL)
1.121 djm 375: fatal_f("sshbuf_new failed");
1.103 markus 376: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
377: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
1.121 djm 378: fatal_fr(r, "assemble");
1.1 provos 379:
1.103 markus 380: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 381:
1.103 markus 382: sshbuf_free(m);
1.1 provos 383: }
384:
385: /* Do the password authentication */
386: int
1.99 djm 387: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 388: {
1.103 markus 389: struct sshbuf *m;
390: int r, authenticated = 0;
1.1 provos 391:
1.121 djm 392: debug3_f("entering");
1.1 provos 393:
1.103 markus 394: if ((m = sshbuf_new()) == NULL)
1.121 djm 395: fatal_f("sshbuf_new failed");
1.103 markus 396: if ((r = sshbuf_put_cstring(m, password)) != 0)
1.121 djm 397: fatal_fr(r, "assemble");
1.103 markus 398: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 399:
1.121 djm 400: debug3_f("waiting for MONITOR_ANS_AUTHPASSWORD");
1.103 markus 401: mm_request_receive_expect(pmonitor->m_recvfd,
402: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 403:
1.103 markus 404: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 djm 405: fatal_fr(r, "parse");
1.1 provos 406:
1.103 markus 407: sshbuf_free(m);
1.1 provos 408:
1.121 djm 409: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.1 provos 410: return (authenticated);
411: }
412:
413: int
1.125 ! 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
1.111 djm 422: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
423: const char *user, const char *host, 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:
1.121 djm 436: debug3_f("entering");
1.1 provos 437:
1.99 djm 438: if (authoptp != NULL)
439: *authoptp = NULL;
440:
1.103 markus 441: if ((m = sshbuf_new()) == NULL)
1.121 djm 442: fatal_f("sshbuf_new failed");
1.103 markus 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)
1.121 djm 448: fatal_fr(r, "assemble");
1.1 provos 449:
1.103 markus 450: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 451:
1.121 djm 452: debug3_f("waiting for MONITOR_ANS_KEYALLOWED");
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)
1.121 djm 457: fatal_fr(r, "parse");
458: if (allowed && type == MM_USERKEY &&
459: (r = sshauthopt_deserialise(m, &opts)) != 0)
460: fatal_fr(r, "sshauthopt_deserialise");
1.103 markus 461: sshbuf_free(m);
1.1 provos 462:
1.99 djm 463: if (authoptp != NULL) {
464: *authoptp = opts;
465: opts = NULL;
466: }
467: sshauthopt_free(opts);
1.1 provos 468:
1.99 djm 469: return allowed;
1.1 provos 470: }
471:
1.3 markus 472: /*
1.1 provos 473: * This key verify needs to send the key type along, because the
474: * privileged parent makes the decision if the key is allowed
475: * for authentication.
476: */
477:
478: int
1.92 markus 479: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.116 djm 480: const u_char *data, size_t datalen, const char *sigalg, u_int compat,
481: struct sshkey_sig_details **sig_detailsp)
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;
1.116 djm 486: u_char sig_details_present, flags;
487: u_int counter;
1.1 provos 488:
1.121 djm 489: debug3_f("entering");
1.1 provos 490:
1.116 djm 491: if (sig_detailsp != NULL)
492: *sig_detailsp = NULL;
1.103 markus 493: if ((m = sshbuf_new()) == NULL)
1.121 djm 494: fatal_f("sshbuf_new failed");
1.103 markus 495: if ((r = sshkey_puts(key, m)) != 0 ||
496: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
497: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
498: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
1.121 djm 499: fatal_fr(r, "assemble");
1.1 provos 500:
1.103 markus 501: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 502:
1.121 djm 503: debug3_f("waiting for MONITOR_ANS_KEYVERIFY");
1.103 markus 504: mm_request_receive_expect(pmonitor->m_recvfd,
505: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 506:
1.116 djm 507: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
508: (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
1.121 djm 509: fatal_fr(r, "parse");
1.116 djm 510: if (sig_details_present && encoded_ret == 0) {
511: if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
512: (r = sshbuf_get_u8(m, &flags)) != 0)
1.121 djm 513: fatal_fr(r, "parse sig_details");
1.116 djm 514: if (sig_detailsp != NULL) {
515: *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
516: (*sig_detailsp)->sk_counter = counter;
517: (*sig_detailsp)->sk_flags = flags;
518: }
519: }
1.1 provos 520:
1.103 markus 521: sshbuf_free(m);
1.1 provos 522:
1.92 markus 523: if (encoded_ret != 0)
524: return SSH_ERR_SIGNATURE_INVALID;
525: return 0;
1.1 provos 526: }
527:
528: void
1.111 djm 529: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 530: {
1.82 markus 531: struct sshbuf *m;
532: int r;
533:
534: if ((m = sshbuf_new()) == NULL)
1.121 djm 535: fatal_f("sshbuf_new failed");
1.82 markus 536: if ((r = ssh_packet_get_state(ssh, m)) != 0)
1.121 djm 537: fatal_fr(r, "ssh_packet_get_state");
1.82 markus 538: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.121 djm 539: debug3_f("Finished sending state");
1.82 markus 540: sshbuf_free(m);
1.1 provos 541: }
542:
543: int
1.42 deraadt 544: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 545: {
1.103 markus 546: struct sshbuf *m;
1.39 dtucker 547: char *p, *msg;
1.102 markus 548: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 549:
550: /* Kludge: ensure there are fds free to receive the pty/tty */
551: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
552: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
1.121 djm 553: error_f("cannot allocate fds for pty");
1.62 djm 554: if (tmp1 > 0)
555: close(tmp1);
556: if (tmp2 > 0)
557: close(tmp2);
558: return 0;
559: }
560: close(tmp1);
561: close(tmp2);
1.1 provos 562:
1.103 markus 563: if ((m = sshbuf_new()) == NULL)
1.121 djm 564: fatal_f("sshbuf_new failed");
1.103 markus 565: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 566:
1.121 djm 567: debug3_f("waiting for MONITOR_ANS_PTY");
1.103 markus 568: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 569:
1.103 markus 570: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 djm 571: fatal_fr(r, "parse success");
1.1 provos 572: if (success == 0) {
1.121 djm 573: debug3_f("pty alloc failed");
1.103 markus 574: sshbuf_free(m);
1.1 provos 575: return (0);
576: }
1.103 markus 577: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
578: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
1.121 djm 579: fatal_fr(r, "parse");
1.103 markus 580: sshbuf_free(m);
1.1 provos 581:
582: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 583: free(p);
1.39 dtucker 584:
1.102 markus 585: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
1.121 djm 586: fatal_fr(r, "put loginmsg");
1.76 djm 587: free(msg);
1.1 provos 588:
1.58 djm 589: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
590: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
1.121 djm 591: fatal_f("receive fds failed");
1.1 provos 592:
593: /* Success */
594: return (1);
595: }
596:
597: void
1.32 markus 598: mm_session_pty_cleanup2(Session *s)
1.1 provos 599: {
1.103 markus 600: struct sshbuf *m;
601: int r;
1.1 provos 602:
603: if (s->ttyfd == -1)
604: return;
1.103 markus 605: if ((m = sshbuf_new()) == NULL)
1.121 djm 606: fatal_f("sshbuf_new failed");
1.103 markus 607: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
1.121 djm 608: fatal_fr(r, "assmble");
1.103 markus 609: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
610: sshbuf_free(m);
1.3 markus 611:
1.1 provos 612: /* closed dup'ed master */
1.113 deraadt 613: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.62 djm 614: error("close(s->ptymaster/%d): %s",
615: s->ptymaster, strerror(errno));
1.1 provos 616:
617: /* unlink pty from session */
618: s->ttyfd = -1;
619: }
620:
621: /* Request process termination */
622:
623: void
624: mm_terminate(void)
625: {
1.103 markus 626: struct sshbuf *m;
1.1 provos 627:
1.103 markus 628: if ((m = sshbuf_new()) == NULL)
1.121 djm 629: fatal_f("sshbuf_new failed");
1.103 markus 630: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
631: sshbuf_free(m);
1.1 provos 632: }
633:
1.2 markus 634: static void
1.1 provos 635: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
636: char ***prompts, u_int **echo_on)
637: {
1.10 deraadt 638: *name = xstrdup("");
639: *infotxt = xstrdup("");
1.1 provos 640: *numprompts = 1;
1.43 djm 641: *prompts = xcalloc(*numprompts, sizeof(char *));
642: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 643: (*echo_on)[0] = 0;
644: }
645:
646: int
647: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
648: u_int *numprompts, char ***prompts, u_int **echo_on)
649: {
1.103 markus 650: struct sshbuf *m;
1.21 markus 651: u_int success;
1.1 provos 652: char *challenge;
1.103 markus 653: int r;
1.1 provos 654:
1.121 djm 655: debug3_f("entering");
1.1 provos 656:
1.103 markus 657: if ((m = sshbuf_new()) == NULL)
1.121 djm 658: fatal_f("sshbuf_new failed");
1.103 markus 659: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 660:
1.103 markus 661: mm_request_receive_expect(pmonitor->m_recvfd,
662: MONITOR_ANS_BSDAUTHQUERY, m);
663: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 djm 664: fatal_fr(r, "parse success");
1.21 markus 665: if (success == 0) {
1.121 djm 666: debug3_f("no challenge");
1.103 markus 667: sshbuf_free(m);
1.1 provos 668: return (-1);
669: }
670:
671: /* Get the challenge, and format the response */
1.103 markus 672: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
1.121 djm 673: fatal_fr(r, "parse challenge");
1.103 markus 674: sshbuf_free(m);
1.1 provos 675:
676: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
677: (*prompts)[0] = challenge;
678:
1.121 djm 679: debug3_f("received challenge: %s", challenge);
1.1 provos 680:
681: return (0);
682: }
683:
684: int
685: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
686: {
1.103 markus 687: struct sshbuf *m;
688: int r, authok;
1.1 provos 689:
1.121 djm 690: debug3_f("entering");
1.1 provos 691: if (numresponses != 1)
692: return (-1);
693:
1.103 markus 694: if ((m = sshbuf_new()) == NULL)
1.121 djm 695: fatal_f("sshbuf_new failed");
1.103 markus 696: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
1.121 djm 697: fatal_fr(r, "assemble");
1.103 markus 698: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 699:
1.7 mouring 700: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 701: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 702:
1.103 markus 703: if ((r = sshbuf_get_u32(m, &authok)) != 0)
1.121 djm 704: fatal_fr(r, "parse");
1.103 markus 705: sshbuf_free(m);
1.1 provos 706:
707: return ((authok == 0) ? -1 : 0);
708: }
1.29 markus 709:
710: #ifdef GSSAPI
711: OM_uint32
1.36 avsm 712: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 713: {
1.103 markus 714: struct sshbuf *m;
1.29 markus 715: OM_uint32 major;
1.103 markus 716: int r;
1.29 markus 717:
718: /* Client doesn't get to see the context */
719: *ctx = NULL;
720:
1.103 markus 721: if ((m = sshbuf_new()) == NULL)
1.121 djm 722: fatal_f("sshbuf_new failed");
1.103 markus 723: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
1.121 djm 724: fatal_fr(r, "assemble");
1.29 markus 725:
1.103 markus 726: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
727: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 728:
1.103 markus 729: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 djm 730: fatal_fr(r, "parse");
1.29 markus 731:
1.103 markus 732: sshbuf_free(m);
1.29 markus 733: return (major);
734: }
735:
736: OM_uint32
737: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 738: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 739: {
1.103 markus 740: struct sshbuf *m;
1.29 markus 741: OM_uint32 major;
1.103 markus 742: u_int flags;
743: int r;
1.29 markus 744:
1.103 markus 745: if ((m = sshbuf_new()) == NULL)
1.121 djm 746: fatal_f("sshbuf_new failed");
1.103 markus 747: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
1.121 djm 748: fatal_fr(r, "assemble");
1.29 markus 749:
1.103 markus 750: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
751: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 752:
1.103 markus 753: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 754: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.121 djm 755: fatal_fr(r, "parse");
1.103 markus 756: if (flagsp != NULL) {
757: if ((r = sshbuf_get_u32(m, &flags)) != 0)
1.121 djm 758: fatal_fr(r, "parse flags");
1.103 markus 759: *flagsp = flags;
760: }
1.29 markus 761:
1.103 markus 762: sshbuf_free(m);
1.29 markus 763:
764: return (major);
1.35 markus 765: }
766:
767: OM_uint32
768: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
769: {
1.103 markus 770: struct sshbuf *m;
1.35 markus 771: OM_uint32 major;
1.103 markus 772: int r;
773:
774: if ((m = sshbuf_new()) == NULL)
1.121 djm 775: fatal_f("sshbuf_new failed");
1.103 markus 776: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
777: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
1.121 djm 778: fatal_fr(r, "assemble");
1.35 markus 779:
1.103 markus 780: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
781: mm_request_receive_expect(pmonitor->m_recvfd,
782: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 783:
1.103 markus 784: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 djm 785: fatal_fr(r, "parse");
1.103 markus 786: sshbuf_free(m);
1.35 markus 787: return(major);
1.29 markus 788: }
789:
790: int
791: mm_ssh_gssapi_userok(char *user)
792: {
1.103 markus 793: struct sshbuf *m;
794: int r, authenticated = 0;
1.29 markus 795:
1.103 markus 796: if ((m = sshbuf_new()) == NULL)
1.121 djm 797: fatal_f("sshbuf_new failed");
1.29 markus 798:
1.103 markus 799: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
800: mm_request_receive_expect(pmonitor->m_recvfd,
801: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 802:
1.103 markus 803: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 djm 804: fatal_fr(r, "parse");
1.29 markus 805:
1.103 markus 806: sshbuf_free(m);
1.121 djm 807: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.29 markus 808: return (authenticated);
809: }
810: #endif /* GSSAPI */
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