Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.130
1.130 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.129 2023/12/18 14:45:49 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 "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"
1.130 ! djm 71: #include "monitor_wrap.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)) {
1.130 ! djm 146: if (errno == EPIPE) {
! 147: debug3_f("monitor fd closed");
1.32 markus 148: cleanup_exit(255);
1.130 ! djm 149: }
1.121 djm 150: fatal_f("read: %s", strerror(errno));
1.1 provos 151: }
1.103 markus 152: msg_len = PEEK_U32(buf);
1.1 provos 153: if (msg_len > 256 * 1024)
1.121 djm 154: fatal_f("read: bad msg_len %d", msg_len);
1.103 markus 155: sshbuf_reset(m);
156: if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
1.121 djm 157: fatal_fr(r, "reserve");
1.103 markus 158: if (atomicio(read, sock, p, msg_len) != msg_len)
1.121 djm 159: fatal_f("read: %s", strerror(errno));
1.1 provos 160: }
161:
162: void
1.103 markus 163: mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 164: {
165: u_char rtype;
1.103 markus 166: int r;
1.1 provos 167:
1.121 djm 168: debug3_f("entering, type %d", type);
1.1 provos 169:
1.36 avsm 170: mm_request_receive(sock, m);
1.103 markus 171: if ((r = sshbuf_get_u8(m, &rtype)) != 0)
1.121 djm 172: fatal_fr(r, "parse");
1.1 provos 173: if (rtype != type)
1.121 djm 174: fatal_f("read: rtype %d != type %d", rtype, type);
1.1 provos 175: }
176:
1.80 markus 177: #ifdef WITH_OPENSSL
1.1 provos 178: DH *
179: mm_choose_dh(int min, int nbits, int max)
180: {
181: BIGNUM *p, *g;
1.103 markus 182: int r;
183: u_char success = 0;
184: struct sshbuf *m;
1.1 provos 185:
1.103 markus 186: if ((m = sshbuf_new()) == NULL)
1.121 djm 187: fatal_f("sshbuf_new failed");
1.103 markus 188: if ((r = sshbuf_put_u32(m, min)) != 0 ||
189: (r = sshbuf_put_u32(m, nbits)) != 0 ||
190: (r = sshbuf_put_u32(m, max)) != 0)
1.121 djm 191: fatal_fr(r, "assemble");
1.1 provos 192:
1.103 markus 193: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
1.1 provos 194:
1.121 djm 195: debug3_f("waiting for MONITOR_ANS_MODULI");
1.103 markus 196: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m);
1.1 provos 197:
1.103 markus 198: if ((r = sshbuf_get_u8(m, &success)) != 0)
1.121 djm 199: fatal_fr(r, "parse success");
1.1 provos 200: if (success == 0)
1.121 djm 201: fatal_f("MONITOR_ANS_MODULI failed");
1.1 provos 202:
1.112 djm 203: if ((r = sshbuf_get_bignum2(m, &p)) != 0 ||
204: (r = sshbuf_get_bignum2(m, &g)) != 0)
1.121 djm 205: fatal_fr(r, "parse group");
1.1 provos 206:
1.121 djm 207: debug3_f("remaining %zu", sshbuf_len(m));
1.103 markus 208: sshbuf_free(m);
1.1 provos 209:
210: return (dh_new_group(g, p));
211: }
1.80 markus 212: #endif
1.1 provos 213:
214: int
1.111 djm 215: mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.114 djm 216: const u_char *data, size_t datalen, const char *hostkey_alg,
1.118 djm 217: const char *sk_provider, const char *sk_pin, 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:
1.121 djm 224: debug3_f("entering");
1.103 markus 225: if ((m = sshbuf_new()) == NULL)
1.121 djm 226: fatal_f("sshbuf_new failed");
1.103 markus 227: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
228: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
1.106 markus 229: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
230: (r = sshbuf_put_u32(m, compat)) != 0)
1.121 djm 231: fatal_fr(r, "assemble");
1.1 provos 232:
1.103 markus 233: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 234:
1.121 djm 235: debug3_f("waiting for MONITOR_ANS_SIGN");
1.103 markus 236: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
1.106 markus 237: if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
1.121 djm 238: fatal_fr(r, "parse");
1.103 markus 239: sshbuf_free(m);
1.1 provos 240:
241: return (0);
242: }
243:
1.130 ! djm 244: void
! 245: mm_decode_activate_server_options(struct ssh *ssh, struct sshbuf *m)
! 246: {
! 247: const u_char *p;
! 248: size_t len;
! 249: u_int i;
! 250: ServerOptions *newopts;
! 251: int r;
! 252:
! 253: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
! 254: fatal_fr(r, "parse opts");
! 255: if (len != sizeof(*newopts))
! 256: fatal_f("option block size mismatch");
! 257: newopts = xcalloc(sizeof(*newopts), 1);
! 258: memcpy(newopts, p, sizeof(*newopts));
! 259:
! 260: #define M_CP_STROPT(x) do { \
! 261: if (newopts->x != NULL && \
! 262: (r = sshbuf_get_cstring(m, &newopts->x, NULL)) != 0) \
! 263: fatal_fr(r, "parse %s", #x); \
! 264: } while (0)
! 265: #define M_CP_STRARRAYOPT(x, nx) do { \
! 266: newopts->x = newopts->nx == 0 ? \
! 267: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
! 268: for (i = 0; i < newopts->nx; i++) { \
! 269: if ((r = sshbuf_get_cstring(m, \
! 270: &newopts->x[i], NULL)) != 0) \
! 271: fatal_fr(r, "parse %s", #x); \
! 272: } \
! 273: } while (0)
! 274: /* See comment in servconf.h */
! 275: COPY_MATCH_STRING_OPTS();
! 276: #undef M_CP_STROPT
! 277: #undef M_CP_STRARRAYOPT
! 278:
! 279: copy_set_server_options(&options, newopts, 1);
! 280: log_change_level(options.log_level);
! 281: log_verbose_reset();
! 282: for (i = 0; i < options.num_log_verbose; i++)
! 283: log_verbose_add(options.log_verbose[i]);
! 284: free(newopts);
! 285: }
! 286:
1.122 djm 287: #define GETPW(b, id) \
288: do { \
289: if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0) \
290: fatal_fr(r, "parse pw %s", #id); \
291: if (len != sizeof(pw->id)) \
292: fatal_fr(r, "bad length for %s", #id); \
293: memcpy(&pw->id, p, len); \
294: } while (0)
295:
1.1 provos 296: struct passwd *
1.109 djm 297: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 298: {
1.103 markus 299: struct sshbuf *m;
1.1 provos 300: struct passwd *pw;
1.103 markus 301: size_t len;
302: int r;
303: u_char ok;
304: const u_char *p;
1.1 provos 305:
1.121 djm 306: debug3_f("entering");
1.1 provos 307:
1.103 markus 308: if ((m = sshbuf_new()) == NULL)
1.121 djm 309: fatal_f("sshbuf_new failed");
1.103 markus 310: if ((r = sshbuf_put_cstring(m, username)) != 0)
1.121 djm 311: fatal_fr(r, "assemble");
1.1 provos 312:
1.103 markus 313: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 314:
1.121 djm 315: debug3_f("waiting for MONITOR_ANS_PWNAM");
1.103 markus 316: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 317:
1.103 markus 318: if ((r = sshbuf_get_u8(m, &ok)) != 0)
1.121 djm 319: fatal_fr(r, "parse success");
1.103 markus 320: if (ok == 0) {
1.60 dtucker 321: pw = NULL;
322: goto out;
1.1 provos 323: }
1.103 markus 324:
325: pw = xcalloc(sizeof(*pw), 1);
1.122 djm 326: GETPW(m, pw_uid);
327: GETPW(m, pw_gid);
328: GETPW(m, pw_change);
329: GETPW(m, pw_expire);
1.103 markus 330: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
331: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
332: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
333: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
334: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
335: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
1.121 djm 336: fatal_fr(r, "parse pw");
1.55 dtucker 337:
1.60 dtucker 338: out:
1.55 dtucker 339: /* copy options block as a Match directive may have changed some */
1.130 ! djm 340: mm_decode_activate_server_options(ssh, m);
! 341: server_process_permitopen(ssh);
! 342: server_process_channel_timeouts(ssh);
1.129 djm 343: kex_set_server_sig_algs(ssh, options.pubkey_accepted_algos);
1.103 markus 344: sshbuf_free(m);
1.1 provos 345:
346: return (pw);
1.6 djm 347: }
348:
1.33 markus 349: char *
350: mm_auth2_read_banner(void)
1.6 djm 351: {
1.103 markus 352: struct sshbuf *m;
1.6 djm 353: char *banner;
1.103 markus 354: int r;
1.6 djm 355:
1.121 djm 356: debug3_f("entering");
1.6 djm 357:
1.103 markus 358: if ((m = sshbuf_new()) == NULL)
1.121 djm 359: fatal_f("sshbuf_new failed");
1.103 markus 360: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
361: sshbuf_reset(m);
1.6 djm 362:
1.33 markus 363: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 364: MONITOR_ANS_AUTH2_READ_BANNER, m);
365: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
1.121 djm 366: fatal_fr(r, "parse");
1.103 markus 367: sshbuf_free(m);
1.10 deraadt 368:
1.33 markus 369: /* treat empty banner as missing banner */
370: if (strlen(banner) == 0) {
1.76 djm 371: free(banner);
1.33 markus 372: banner = NULL;
373: }
1.6 djm 374: return (banner);
1.1 provos 375: }
376:
377: /* Inform the privileged process about service and style */
378:
379: void
380: mm_inform_authserv(char *service, char *style)
381: {
1.103 markus 382: struct sshbuf *m;
383: int r;
1.1 provos 384:
1.121 djm 385: debug3_f("entering");
1.1 provos 386:
1.103 markus 387: if ((m = sshbuf_new()) == NULL)
1.121 djm 388: fatal_f("sshbuf_new failed");
1.103 markus 389: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
390: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
1.121 djm 391: fatal_fr(r, "assemble");
1.1 provos 392:
1.103 markus 393: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 394:
1.103 markus 395: sshbuf_free(m);
1.1 provos 396: }
397:
398: /* Do the password authentication */
399: int
1.99 djm 400: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 401: {
1.103 markus 402: struct sshbuf *m;
403: int r, authenticated = 0;
1.1 provos 404:
1.121 djm 405: debug3_f("entering");
1.1 provos 406:
1.103 markus 407: if ((m = sshbuf_new()) == NULL)
1.121 djm 408: fatal_f("sshbuf_new failed");
1.103 markus 409: if ((r = sshbuf_put_cstring(m, password)) != 0)
1.121 djm 410: fatal_fr(r, "assemble");
1.103 markus 411: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 412:
1.121 djm 413: debug3_f("waiting for MONITOR_ANS_AUTHPASSWORD");
1.103 markus 414: mm_request_receive_expect(pmonitor->m_recvfd,
415: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 416:
1.103 markus 417: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 djm 418: fatal_fr(r, "parse");
1.1 provos 419:
1.103 markus 420: sshbuf_free(m);
1.1 provos 421:
1.121 djm 422: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.1 provos 423: return (authenticated);
424: }
425:
426: int
1.125 djm 427: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
428: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 429: {
1.85 djm 430: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 431: pubkey_auth_attempt, authoptp));
1.1 provos 432: }
433:
434: int
1.111 djm 435: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
436: const char *user, const char *host, struct sshkey *key)
1.1 provos 437: {
1.99 djm 438: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 439: }
440:
441: int
1.88 djm 442: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 443: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 444: {
1.103 markus 445: struct sshbuf *m;
1.99 djm 446: int r, allowed = 0;
447: struct sshauthopt *opts = NULL;
1.1 provos 448:
1.121 djm 449: debug3_f("entering");
1.1 provos 450:
1.99 djm 451: if (authoptp != NULL)
452: *authoptp = NULL;
453:
1.103 markus 454: if ((m = sshbuf_new()) == NULL)
1.121 djm 455: fatal_f("sshbuf_new failed");
1.103 markus 456: if ((r = sshbuf_put_u32(m, type)) != 0 ||
457: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
458: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
459: (r = sshkey_puts(key, m)) != 0 ||
460: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
1.121 djm 461: fatal_fr(r, "assemble");
1.1 provos 462:
1.103 markus 463: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 464:
1.121 djm 465: debug3_f("waiting for MONITOR_ANS_KEYALLOWED");
1.99 djm 466: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 467: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 468:
1.103 markus 469: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
1.121 djm 470: fatal_fr(r, "parse");
471: if (allowed && type == MM_USERKEY &&
472: (r = sshauthopt_deserialise(m, &opts)) != 0)
473: fatal_fr(r, "sshauthopt_deserialise");
1.103 markus 474: sshbuf_free(m);
1.1 provos 475:
1.99 djm 476: if (authoptp != NULL) {
477: *authoptp = opts;
478: opts = NULL;
479: }
480: sshauthopt_free(opts);
1.1 provos 481:
1.99 djm 482: return allowed;
1.1 provos 483: }
484:
1.3 markus 485: /*
1.1 provos 486: * This key verify needs to send the key type along, because the
487: * privileged parent makes the decision if the key is allowed
488: * for authentication.
489: */
490:
491: int
1.92 markus 492: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.116 djm 493: const u_char *data, size_t datalen, const char *sigalg, u_int compat,
494: struct sshkey_sig_details **sig_detailsp)
1.1 provos 495: {
1.103 markus 496: struct sshbuf *m;
1.92 markus 497: u_int encoded_ret = 0;
1.103 markus 498: int r;
1.116 djm 499: u_char sig_details_present, flags;
500: u_int counter;
1.1 provos 501:
1.121 djm 502: debug3_f("entering");
1.1 provos 503:
1.116 djm 504: if (sig_detailsp != NULL)
505: *sig_detailsp = NULL;
1.103 markus 506: if ((m = sshbuf_new()) == NULL)
1.121 djm 507: fatal_f("sshbuf_new failed");
1.103 markus 508: if ((r = sshkey_puts(key, m)) != 0 ||
509: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
510: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
511: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
1.121 djm 512: fatal_fr(r, "assemble");
1.1 provos 513:
1.103 markus 514: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 515:
1.121 djm 516: debug3_f("waiting for MONITOR_ANS_KEYVERIFY");
1.103 markus 517: mm_request_receive_expect(pmonitor->m_recvfd,
518: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 519:
1.116 djm 520: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
521: (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
1.121 djm 522: fatal_fr(r, "parse");
1.116 djm 523: if (sig_details_present && encoded_ret == 0) {
524: if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
525: (r = sshbuf_get_u8(m, &flags)) != 0)
1.121 djm 526: fatal_fr(r, "parse sig_details");
1.116 djm 527: if (sig_detailsp != NULL) {
528: *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
529: (*sig_detailsp)->sk_counter = counter;
530: (*sig_detailsp)->sk_flags = flags;
531: }
532: }
1.1 provos 533:
1.103 markus 534: sshbuf_free(m);
1.1 provos 535:
1.92 markus 536: if (encoded_ret != 0)
537: return SSH_ERR_SIGNATURE_INVALID;
538: return 0;
1.1 provos 539: }
540:
541: void
1.111 djm 542: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 543: {
1.82 markus 544: struct sshbuf *m;
545: int r;
546:
547: if ((m = sshbuf_new()) == NULL)
1.121 djm 548: fatal_f("sshbuf_new failed");
1.82 markus 549: if ((r = ssh_packet_get_state(ssh, m)) != 0)
1.121 djm 550: fatal_fr(r, "ssh_packet_get_state");
1.82 markus 551: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.121 djm 552: debug3_f("Finished sending state");
1.82 markus 553: sshbuf_free(m);
1.1 provos 554: }
555:
556: int
1.42 deraadt 557: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 558: {
1.103 markus 559: struct sshbuf *m;
1.39 dtucker 560: char *p, *msg;
1.102 markus 561: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 562:
563: /* Kludge: ensure there are fds free to receive the pty/tty */
564: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
565: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
1.121 djm 566: error_f("cannot allocate fds for pty");
1.128 dtucker 567: if (tmp1 >= 0)
1.62 djm 568: close(tmp1);
569: return 0;
570: }
571: close(tmp1);
572: close(tmp2);
1.1 provos 573:
1.103 markus 574: if ((m = sshbuf_new()) == NULL)
1.121 djm 575: fatal_f("sshbuf_new failed");
1.103 markus 576: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 577:
1.121 djm 578: debug3_f("waiting for MONITOR_ANS_PTY");
1.103 markus 579: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 580:
1.103 markus 581: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 djm 582: fatal_fr(r, "parse success");
1.1 provos 583: if (success == 0) {
1.121 djm 584: debug3_f("pty alloc failed");
1.103 markus 585: sshbuf_free(m);
1.1 provos 586: return (0);
587: }
1.103 markus 588: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
589: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
1.121 djm 590: fatal_fr(r, "parse");
1.103 markus 591: sshbuf_free(m);
1.1 provos 592:
593: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 594: free(p);
1.39 dtucker 595:
1.102 markus 596: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
1.121 djm 597: fatal_fr(r, "put loginmsg");
1.76 djm 598: free(msg);
1.1 provos 599:
1.58 djm 600: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
601: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
1.121 djm 602: fatal_f("receive fds failed");
1.1 provos 603:
604: /* Success */
605: return (1);
606: }
607:
608: void
1.32 markus 609: mm_session_pty_cleanup2(Session *s)
1.1 provos 610: {
1.103 markus 611: struct sshbuf *m;
612: int r;
1.1 provos 613:
614: if (s->ttyfd == -1)
615: return;
1.103 markus 616: if ((m = sshbuf_new()) == NULL)
1.121 djm 617: fatal_f("sshbuf_new failed");
1.103 markus 618: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
1.121 djm 619: fatal_fr(r, "assmble");
1.103 markus 620: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
621: sshbuf_free(m);
1.3 markus 622:
1.1 provos 623: /* closed dup'ed master */
1.113 deraadt 624: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.62 djm 625: error("close(s->ptymaster/%d): %s",
626: s->ptymaster, strerror(errno));
1.1 provos 627:
628: /* unlink pty from session */
629: s->ttyfd = -1;
630: }
631:
632: /* Request process termination */
633:
634: void
635: mm_terminate(void)
636: {
1.103 markus 637: struct sshbuf *m;
1.1 provos 638:
1.103 markus 639: if ((m = sshbuf_new()) == NULL)
1.121 djm 640: fatal_f("sshbuf_new failed");
1.103 markus 641: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
642: sshbuf_free(m);
1.1 provos 643: }
644:
1.2 markus 645: static void
1.1 provos 646: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
647: char ***prompts, u_int **echo_on)
648: {
1.10 deraadt 649: *name = xstrdup("");
650: *infotxt = xstrdup("");
1.1 provos 651: *numprompts = 1;
1.43 djm 652: *prompts = xcalloc(*numprompts, sizeof(char *));
653: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 654: (*echo_on)[0] = 0;
655: }
656:
657: int
658: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
659: u_int *numprompts, char ***prompts, u_int **echo_on)
660: {
1.103 markus 661: struct sshbuf *m;
1.21 markus 662: u_int success;
1.1 provos 663: char *challenge;
1.103 markus 664: int r;
1.1 provos 665:
1.121 djm 666: debug3_f("entering");
1.1 provos 667:
1.103 markus 668: if ((m = sshbuf_new()) == NULL)
1.121 djm 669: fatal_f("sshbuf_new failed");
1.103 markus 670: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 671:
1.103 markus 672: mm_request_receive_expect(pmonitor->m_recvfd,
673: MONITOR_ANS_BSDAUTHQUERY, m);
674: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 djm 675: fatal_fr(r, "parse success");
1.21 markus 676: if (success == 0) {
1.121 djm 677: debug3_f("no challenge");
1.103 markus 678: sshbuf_free(m);
1.1 provos 679: return (-1);
680: }
681:
682: /* Get the challenge, and format the response */
1.103 markus 683: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
1.121 djm 684: fatal_fr(r, "parse challenge");
1.103 markus 685: sshbuf_free(m);
1.1 provos 686:
687: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
688: (*prompts)[0] = challenge;
689:
1.121 djm 690: debug3_f("received challenge: %s", challenge);
1.1 provos 691:
692: return (0);
693: }
694:
695: int
696: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
697: {
1.103 markus 698: struct sshbuf *m;
699: int r, authok;
1.1 provos 700:
1.121 djm 701: debug3_f("entering");
1.1 provos 702: if (numresponses != 1)
703: return (-1);
704:
1.103 markus 705: if ((m = sshbuf_new()) == NULL)
1.121 djm 706: fatal_f("sshbuf_new failed");
1.103 markus 707: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
1.121 djm 708: fatal_fr(r, "assemble");
1.103 markus 709: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 710:
1.7 mouring 711: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 712: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 713:
1.103 markus 714: if ((r = sshbuf_get_u32(m, &authok)) != 0)
1.121 djm 715: fatal_fr(r, "parse");
1.103 markus 716: sshbuf_free(m);
1.1 provos 717:
718: return ((authok == 0) ? -1 : 0);
719: }
1.29 markus 720:
721: #ifdef GSSAPI
722: OM_uint32
1.36 avsm 723: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 724: {
1.103 markus 725: struct sshbuf *m;
1.29 markus 726: OM_uint32 major;
1.103 markus 727: int r;
1.29 markus 728:
729: /* Client doesn't get to see the context */
730: *ctx = NULL;
731:
1.103 markus 732: if ((m = sshbuf_new()) == NULL)
1.121 djm 733: fatal_f("sshbuf_new failed");
1.103 markus 734: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
1.121 djm 735: fatal_fr(r, "assemble");
1.29 markus 736:
1.103 markus 737: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
738: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 739:
1.103 markus 740: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 djm 741: fatal_fr(r, "parse");
1.29 markus 742:
1.103 markus 743: sshbuf_free(m);
1.29 markus 744: return (major);
745: }
746:
747: OM_uint32
748: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 749: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 750: {
1.103 markus 751: struct sshbuf *m;
1.29 markus 752: OM_uint32 major;
1.103 markus 753: u_int flags;
754: int r;
1.29 markus 755:
1.103 markus 756: if ((m = sshbuf_new()) == NULL)
1.121 djm 757: fatal_f("sshbuf_new failed");
1.103 markus 758: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
1.121 djm 759: fatal_fr(r, "assemble");
1.29 markus 760:
1.103 markus 761: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
762: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 763:
1.103 markus 764: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 765: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.121 djm 766: fatal_fr(r, "parse");
1.103 markus 767: if (flagsp != NULL) {
768: if ((r = sshbuf_get_u32(m, &flags)) != 0)
1.121 djm 769: fatal_fr(r, "parse flags");
1.103 markus 770: *flagsp = flags;
771: }
1.29 markus 772:
1.103 markus 773: sshbuf_free(m);
1.29 markus 774:
775: return (major);
1.35 markus 776: }
777:
778: OM_uint32
779: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
780: {
1.103 markus 781: struct sshbuf *m;
1.35 markus 782: OM_uint32 major;
1.103 markus 783: int r;
784:
785: if ((m = sshbuf_new()) == NULL)
1.121 djm 786: fatal_f("sshbuf_new failed");
1.103 markus 787: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
788: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
1.121 djm 789: fatal_fr(r, "assemble");
1.35 markus 790:
1.103 markus 791: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
792: mm_request_receive_expect(pmonitor->m_recvfd,
793: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 794:
1.103 markus 795: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 djm 796: fatal_fr(r, "parse");
1.103 markus 797: sshbuf_free(m);
1.35 markus 798: return(major);
1.29 markus 799: }
800:
801: int
802: mm_ssh_gssapi_userok(char *user)
803: {
1.103 markus 804: struct sshbuf *m;
805: int r, authenticated = 0;
1.29 markus 806:
1.103 markus 807: if ((m = sshbuf_new()) == NULL)
1.121 djm 808: fatal_f("sshbuf_new failed");
1.29 markus 809:
1.103 markus 810: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
811: mm_request_receive_expect(pmonitor->m_recvfd,
812: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 813:
1.103 markus 814: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 djm 815: fatal_fr(r, "parse");
1.29 markus 816:
1.103 markus 817: sshbuf_free(m);
1.121 djm 818: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.29 markus 819: return (authenticated);
820: }
821: #endif /* GSSAPI */
1.130 ! djm 822:
! 823: /*
! 824: * Inform channels layer of permitopen options for a single forwarding
! 825: * direction (local/remote).
! 826: */
! 827: static void
! 828: server_process_permitopen_list(struct ssh *ssh, int listen,
! 829: char **opens, u_int num_opens)
! 830: {
! 831: u_int i;
! 832: int port;
! 833: char *host, *arg, *oarg;
! 834: int where = listen ? FORWARD_REMOTE : FORWARD_LOCAL;
! 835: const char *what = listen ? "permitlisten" : "permitopen";
! 836:
! 837: channel_clear_permission(ssh, FORWARD_ADM, where);
! 838: if (num_opens == 0)
! 839: return; /* permit any */
! 840:
! 841: /* handle keywords: "any" / "none" */
! 842: if (num_opens == 1 && strcmp(opens[0], "any") == 0)
! 843: return;
! 844: if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
! 845: channel_disable_admin(ssh, where);
! 846: return;
! 847: }
! 848: /* Otherwise treat it as a list of permitted host:port */
! 849: for (i = 0; i < num_opens; i++) {
! 850: oarg = arg = xstrdup(opens[i]);
! 851: host = hpdelim(&arg);
! 852: if (host == NULL)
! 853: fatal_f("missing host in %s", what);
! 854: host = cleanhostname(host);
! 855: if (arg == NULL || ((port = permitopen_port(arg)) < 0))
! 856: fatal_f("bad port number in %s", what);
! 857: /* Send it to channels layer */
! 858: channel_add_permission(ssh, FORWARD_ADM,
! 859: where, host, port);
! 860: free(oarg);
! 861: }
! 862: }
! 863:
! 864: /*
! 865: * Inform channels layer of permitopen options from configuration.
! 866: */
! 867: void
! 868: server_process_permitopen(struct ssh *ssh)
! 869: {
! 870: server_process_permitopen_list(ssh, 0,
! 871: options.permitted_opens, options.num_permitted_opens);
! 872: server_process_permitopen_list(ssh, 1,
! 873: options.permitted_listens, options.num_permitted_listens);
! 874: }
! 875:
! 876: void
! 877: server_process_channel_timeouts(struct ssh *ssh)
! 878: {
! 879: u_int i, secs;
! 880: char *type;
! 881:
! 882: debug3_f("setting %u timeouts", options.num_channel_timeouts);
! 883: channel_clear_timeouts(ssh);
! 884: for (i = 0; i < options.num_channel_timeouts; i++) {
! 885: if (parse_pattern_interval(options.channel_timeouts[i],
! 886: &type, &secs) != 0) {
! 887: fatal_f("internal error: bad timeout %s",
! 888: options.channel_timeouts[i]);
! 889: }
! 890: channel_add_timeout(ssh, type, secs);
! 891: free(type);
! 892: }
! 893: }
! 894:
! 895: struct connection_info *
! 896: server_get_connection_info(struct ssh *ssh, int populate, int use_dns)
! 897: {
! 898: static struct connection_info ci;
! 899:
! 900: if (ssh == NULL || !populate)
! 901: return &ci;
! 902: ci.host = use_dns ? ssh_remote_hostname(ssh) : ssh_remote_ipaddr(ssh);
! 903: ci.address = ssh_remote_ipaddr(ssh);
! 904: ci.laddress = ssh_local_ipaddr(ssh);
! 905: ci.lport = ssh_local_port(ssh);
! 906: ci.rdomain = ssh_packet_rdomain_in(ssh);
! 907: return &ci;
! 908: }
! 909:
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