Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.127
1.127 ! dtucker 1: /* $OpenBSD: monitor_wrap.c,v 1.126 2023/01/06 02:47:18 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);
1.126 djm 329: process_channel_timeouts(ssh, &options);
1.76 djm 330: free(newopts);
1.55 dtucker 331:
1.103 markus 332: sshbuf_free(m);
1.1 provos 333:
334: return (pw);
1.6 djm 335: }
336:
1.33 markus 337: char *
338: mm_auth2_read_banner(void)
1.6 djm 339: {
1.103 markus 340: struct sshbuf *m;
1.6 djm 341: char *banner;
1.103 markus 342: int r;
1.6 djm 343:
1.121 djm 344: debug3_f("entering");
1.6 djm 345:
1.103 markus 346: if ((m = sshbuf_new()) == NULL)
1.121 djm 347: fatal_f("sshbuf_new failed");
1.103 markus 348: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
349: sshbuf_reset(m);
1.6 djm 350:
1.33 markus 351: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 352: MONITOR_ANS_AUTH2_READ_BANNER, m);
353: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
1.121 djm 354: fatal_fr(r, "parse");
1.103 markus 355: sshbuf_free(m);
1.10 deraadt 356:
1.33 markus 357: /* treat empty banner as missing banner */
358: if (strlen(banner) == 0) {
1.76 djm 359: free(banner);
1.33 markus 360: banner = NULL;
361: }
1.6 djm 362: return (banner);
1.1 provos 363: }
364:
365: /* Inform the privileged process about service and style */
366:
367: void
368: mm_inform_authserv(char *service, char *style)
369: {
1.103 markus 370: struct sshbuf *m;
371: int r;
1.1 provos 372:
1.121 djm 373: debug3_f("entering");
1.1 provos 374:
1.103 markus 375: if ((m = sshbuf_new()) == NULL)
1.121 djm 376: fatal_f("sshbuf_new failed");
1.103 markus 377: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
378: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
1.121 djm 379: fatal_fr(r, "assemble");
1.1 provos 380:
1.103 markus 381: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 382:
1.103 markus 383: sshbuf_free(m);
1.1 provos 384: }
385:
386: /* Do the password authentication */
387: int
1.99 djm 388: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 389: {
1.103 markus 390: struct sshbuf *m;
391: int r, authenticated = 0;
1.1 provos 392:
1.121 djm 393: debug3_f("entering");
1.1 provos 394:
1.103 markus 395: if ((m = sshbuf_new()) == NULL)
1.121 djm 396: fatal_f("sshbuf_new failed");
1.103 markus 397: if ((r = sshbuf_put_cstring(m, password)) != 0)
1.121 djm 398: fatal_fr(r, "assemble");
1.103 markus 399: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 400:
1.121 djm 401: debug3_f("waiting for MONITOR_ANS_AUTHPASSWORD");
1.103 markus 402: mm_request_receive_expect(pmonitor->m_recvfd,
403: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 404:
1.103 markus 405: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 djm 406: fatal_fr(r, "parse");
1.1 provos 407:
1.103 markus 408: sshbuf_free(m);
1.1 provos 409:
1.121 djm 410: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.1 provos 411: return (authenticated);
412: }
413:
414: int
1.125 djm 415: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
416: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 417: {
1.85 djm 418: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 419: pubkey_auth_attempt, authoptp));
1.1 provos 420: }
421:
422: int
1.111 djm 423: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
424: const char *user, const char *host, struct sshkey *key)
1.1 provos 425: {
1.99 djm 426: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 427: }
428:
429: int
1.88 djm 430: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 431: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 432: {
1.103 markus 433: struct sshbuf *m;
1.99 djm 434: int r, allowed = 0;
435: struct sshauthopt *opts = NULL;
1.1 provos 436:
1.121 djm 437: debug3_f("entering");
1.1 provos 438:
1.99 djm 439: if (authoptp != NULL)
440: *authoptp = NULL;
441:
1.103 markus 442: if ((m = sshbuf_new()) == NULL)
1.121 djm 443: fatal_f("sshbuf_new failed");
1.103 markus 444: if ((r = sshbuf_put_u32(m, type)) != 0 ||
445: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
446: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
447: (r = sshkey_puts(key, m)) != 0 ||
448: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
1.121 djm 449: fatal_fr(r, "assemble");
1.1 provos 450:
1.103 markus 451: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 452:
1.121 djm 453: debug3_f("waiting for MONITOR_ANS_KEYALLOWED");
1.99 djm 454: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 455: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 456:
1.103 markus 457: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
1.121 djm 458: fatal_fr(r, "parse");
459: if (allowed && type == MM_USERKEY &&
460: (r = sshauthopt_deserialise(m, &opts)) != 0)
461: fatal_fr(r, "sshauthopt_deserialise");
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,
1.116 djm 481: const u_char *data, size_t datalen, const char *sigalg, u_int compat,
482: struct sshkey_sig_details **sig_detailsp)
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;
1.116 djm 487: u_char sig_details_present, flags;
488: u_int counter;
1.1 provos 489:
1.121 djm 490: debug3_f("entering");
1.1 provos 491:
1.116 djm 492: if (sig_detailsp != NULL)
493: *sig_detailsp = NULL;
1.103 markus 494: if ((m = sshbuf_new()) == NULL)
1.121 djm 495: fatal_f("sshbuf_new failed");
1.103 markus 496: if ((r = sshkey_puts(key, m)) != 0 ||
497: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
498: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
499: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
1.121 djm 500: fatal_fr(r, "assemble");
1.1 provos 501:
1.103 markus 502: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 503:
1.121 djm 504: debug3_f("waiting for MONITOR_ANS_KEYVERIFY");
1.103 markus 505: mm_request_receive_expect(pmonitor->m_recvfd,
506: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 507:
1.116 djm 508: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
509: (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
1.121 djm 510: fatal_fr(r, "parse");
1.116 djm 511: if (sig_details_present && encoded_ret == 0) {
512: if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
513: (r = sshbuf_get_u8(m, &flags)) != 0)
1.121 djm 514: fatal_fr(r, "parse sig_details");
1.116 djm 515: if (sig_detailsp != NULL) {
516: *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
517: (*sig_detailsp)->sk_counter = counter;
518: (*sig_detailsp)->sk_flags = flags;
519: }
520: }
1.1 provos 521:
1.103 markus 522: sshbuf_free(m);
1.1 provos 523:
1.92 markus 524: if (encoded_ret != 0)
525: return SSH_ERR_SIGNATURE_INVALID;
526: return 0;
1.1 provos 527: }
528:
529: void
1.111 djm 530: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 531: {
1.82 markus 532: struct sshbuf *m;
533: int r;
534:
535: if ((m = sshbuf_new()) == NULL)
1.121 djm 536: fatal_f("sshbuf_new failed");
1.82 markus 537: if ((r = ssh_packet_get_state(ssh, m)) != 0)
1.121 djm 538: fatal_fr(r, "ssh_packet_get_state");
1.82 markus 539: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.121 djm 540: debug3_f("Finished sending state");
1.82 markus 541: sshbuf_free(m);
1.1 provos 542: }
543:
544: int
1.42 deraadt 545: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 546: {
1.103 markus 547: struct sshbuf *m;
1.39 dtucker 548: char *p, *msg;
1.102 markus 549: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 550:
551: /* Kludge: ensure there are fds free to receive the pty/tty */
552: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
553: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
1.121 djm 554: error_f("cannot allocate fds for pty");
1.62 djm 555: if (tmp1 > 0)
556: close(tmp1);
557: return 0;
558: }
559: close(tmp1);
560: close(tmp2);
1.1 provos 561:
1.103 markus 562: if ((m = sshbuf_new()) == NULL)
1.121 djm 563: fatal_f("sshbuf_new failed");
1.103 markus 564: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 565:
1.121 djm 566: debug3_f("waiting for MONITOR_ANS_PTY");
1.103 markus 567: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 568:
1.103 markus 569: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 djm 570: fatal_fr(r, "parse success");
1.1 provos 571: if (success == 0) {
1.121 djm 572: debug3_f("pty alloc failed");
1.103 markus 573: sshbuf_free(m);
1.1 provos 574: return (0);
575: }
1.103 markus 576: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
577: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
1.121 djm 578: fatal_fr(r, "parse");
1.103 markus 579: sshbuf_free(m);
1.1 provos 580:
581: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 582: free(p);
1.39 dtucker 583:
1.102 markus 584: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
1.121 djm 585: fatal_fr(r, "put loginmsg");
1.76 djm 586: free(msg);
1.1 provos 587:
1.58 djm 588: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
589: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
1.121 djm 590: fatal_f("receive fds failed");
1.1 provos 591:
592: /* Success */
593: return (1);
594: }
595:
596: void
1.32 markus 597: mm_session_pty_cleanup2(Session *s)
1.1 provos 598: {
1.103 markus 599: struct sshbuf *m;
600: int r;
1.1 provos 601:
602: if (s->ttyfd == -1)
603: return;
1.103 markus 604: if ((m = sshbuf_new()) == NULL)
1.121 djm 605: fatal_f("sshbuf_new failed");
1.103 markus 606: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
1.121 djm 607: fatal_fr(r, "assmble");
1.103 markus 608: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
609: sshbuf_free(m);
1.3 markus 610:
1.1 provos 611: /* closed dup'ed master */
1.113 deraadt 612: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.62 djm 613: error("close(s->ptymaster/%d): %s",
614: s->ptymaster, strerror(errno));
1.1 provos 615:
616: /* unlink pty from session */
617: s->ttyfd = -1;
618: }
619:
620: /* Request process termination */
621:
622: void
623: mm_terminate(void)
624: {
1.103 markus 625: struct sshbuf *m;
1.1 provos 626:
1.103 markus 627: if ((m = sshbuf_new()) == NULL)
1.121 djm 628: fatal_f("sshbuf_new failed");
1.103 markus 629: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
630: sshbuf_free(m);
1.1 provos 631: }
632:
1.2 markus 633: static void
1.1 provos 634: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
635: char ***prompts, u_int **echo_on)
636: {
1.10 deraadt 637: *name = xstrdup("");
638: *infotxt = xstrdup("");
1.1 provos 639: *numprompts = 1;
1.43 djm 640: *prompts = xcalloc(*numprompts, sizeof(char *));
641: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 642: (*echo_on)[0] = 0;
643: }
644:
645: int
646: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
647: u_int *numprompts, char ***prompts, u_int **echo_on)
648: {
1.103 markus 649: struct sshbuf *m;
1.21 markus 650: u_int success;
1.1 provos 651: char *challenge;
1.103 markus 652: int r;
1.1 provos 653:
1.121 djm 654: debug3_f("entering");
1.1 provos 655:
1.103 markus 656: if ((m = sshbuf_new()) == NULL)
1.121 djm 657: fatal_f("sshbuf_new failed");
1.103 markus 658: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 659:
1.103 markus 660: mm_request_receive_expect(pmonitor->m_recvfd,
661: MONITOR_ANS_BSDAUTHQUERY, m);
662: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 djm 663: fatal_fr(r, "parse success");
1.21 markus 664: if (success == 0) {
1.121 djm 665: debug3_f("no challenge");
1.103 markus 666: sshbuf_free(m);
1.1 provos 667: return (-1);
668: }
669:
670: /* Get the challenge, and format the response */
1.103 markus 671: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
1.121 djm 672: fatal_fr(r, "parse challenge");
1.103 markus 673: sshbuf_free(m);
1.1 provos 674:
675: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
676: (*prompts)[0] = challenge;
677:
1.121 djm 678: debug3_f("received challenge: %s", challenge);
1.1 provos 679:
680: return (0);
681: }
682:
683: int
684: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
685: {
1.103 markus 686: struct sshbuf *m;
687: int r, authok;
1.1 provos 688:
1.121 djm 689: debug3_f("entering");
1.1 provos 690: if (numresponses != 1)
691: return (-1);
692:
1.103 markus 693: if ((m = sshbuf_new()) == NULL)
1.121 djm 694: fatal_f("sshbuf_new failed");
1.103 markus 695: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
1.121 djm 696: fatal_fr(r, "assemble");
1.103 markus 697: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 698:
1.7 mouring 699: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 700: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 701:
1.103 markus 702: if ((r = sshbuf_get_u32(m, &authok)) != 0)
1.121 djm 703: fatal_fr(r, "parse");
1.103 markus 704: sshbuf_free(m);
1.1 provos 705:
706: return ((authok == 0) ? -1 : 0);
707: }
1.29 markus 708:
709: #ifdef GSSAPI
710: OM_uint32
1.36 avsm 711: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 712: {
1.103 markus 713: struct sshbuf *m;
1.29 markus 714: OM_uint32 major;
1.103 markus 715: int r;
1.29 markus 716:
717: /* Client doesn't get to see the context */
718: *ctx = NULL;
719:
1.103 markus 720: if ((m = sshbuf_new()) == NULL)
1.121 djm 721: fatal_f("sshbuf_new failed");
1.103 markus 722: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
1.121 djm 723: fatal_fr(r, "assemble");
1.29 markus 724:
1.103 markus 725: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
726: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 727:
1.103 markus 728: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 djm 729: fatal_fr(r, "parse");
1.29 markus 730:
1.103 markus 731: sshbuf_free(m);
1.29 markus 732: return (major);
733: }
734:
735: OM_uint32
736: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 737: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 738: {
1.103 markus 739: struct sshbuf *m;
1.29 markus 740: OM_uint32 major;
1.103 markus 741: u_int flags;
742: int r;
1.29 markus 743:
1.103 markus 744: if ((m = sshbuf_new()) == NULL)
1.121 djm 745: fatal_f("sshbuf_new failed");
1.103 markus 746: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
1.121 djm 747: fatal_fr(r, "assemble");
1.29 markus 748:
1.103 markus 749: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
750: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 751:
1.103 markus 752: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 753: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.121 djm 754: fatal_fr(r, "parse");
1.103 markus 755: if (flagsp != NULL) {
756: if ((r = sshbuf_get_u32(m, &flags)) != 0)
1.121 djm 757: fatal_fr(r, "parse flags");
1.103 markus 758: *flagsp = flags;
759: }
1.29 markus 760:
1.103 markus 761: sshbuf_free(m);
1.29 markus 762:
763: return (major);
1.35 markus 764: }
765:
766: OM_uint32
767: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
768: {
1.103 markus 769: struct sshbuf *m;
1.35 markus 770: OM_uint32 major;
1.103 markus 771: int r;
772:
773: if ((m = sshbuf_new()) == NULL)
1.121 djm 774: fatal_f("sshbuf_new failed");
1.103 markus 775: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
776: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
1.121 djm 777: fatal_fr(r, "assemble");
1.35 markus 778:
1.103 markus 779: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
780: mm_request_receive_expect(pmonitor->m_recvfd,
781: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 782:
1.103 markus 783: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 djm 784: fatal_fr(r, "parse");
1.103 markus 785: sshbuf_free(m);
1.35 markus 786: return(major);
1.29 markus 787: }
788:
789: int
790: mm_ssh_gssapi_userok(char *user)
791: {
1.103 markus 792: struct sshbuf *m;
793: int r, authenticated = 0;
1.29 markus 794:
1.103 markus 795: if ((m = sshbuf_new()) == NULL)
1.121 djm 796: fatal_f("sshbuf_new failed");
1.29 markus 797:
1.103 markus 798: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
799: mm_request_receive_expect(pmonitor->m_recvfd,
800: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 801:
1.103 markus 802: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 djm 803: fatal_fr(r, "parse");
1.29 markus 804:
1.103 markus 805: sshbuf_free(m);
1.121 djm 806: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.29 markus 807: return (authenticated);
808: }
809: #endif /* GSSAPI */
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