Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.122
1.122 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.121 2020/10/18 11:32:01 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
1.119 djm 81: mm_log_handler(const char *file, const char *func, int line,
82: LogLevel level, const char *msg, void *ctx)
1.73 djm 83: {
1.103 markus 84: struct sshbuf *log_msg;
1.73 djm 85: struct monitor *mon = (struct monitor *)ctx;
1.103 markus 86: int r;
87: size_t len;
1.73 djm 88:
89: if (mon->m_log_sendfd == -1)
1.121 djm 90: fatal_f("no log channel");
1.73 djm 91:
1.103 markus 92: if ((log_msg = sshbuf_new()) == NULL)
1.121 djm 93: fatal_f("sshbuf_new failed");
1.73 djm 94:
1.103 markus 95: if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */
1.119 djm 96: (r = sshbuf_put_cstring(log_msg, file)) != 0 ||
97: (r = sshbuf_put_cstring(log_msg, func)) != 0 ||
98: (r = sshbuf_put_u32(log_msg, (u_int)line)) != 0 ||
1.103 markus 99: (r = sshbuf_put_u32(log_msg, level)) != 0 ||
100: (r = sshbuf_put_cstring(log_msg, msg)) != 0)
1.121 djm 101: fatal_fr(r, "assemble");
1.103 markus 102: if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
1.121 djm 103: fatal_f("bad length %zu", len);
1.103 markus 104: POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4);
105: if (atomicio(vwrite, mon->m_log_sendfd,
106: sshbuf_mutable_ptr(log_msg), len) != len)
1.121 djm 107: fatal_f("write: %s", strerror(errno));
1.103 markus 108: sshbuf_free(log_msg);
1.73 djm 109: }
1.1 provos 110:
1.32 markus 111: int
112: mm_is_monitor(void)
113: {
114: /*
115: * m_pid is only set in the privileged part, and
116: * points to the unprivileged child.
117: */
1.34 markus 118: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 119: }
120:
1.1 provos 121: void
1.103 markus 122: mm_request_send(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 123: {
1.103 markus 124: size_t mlen = sshbuf_len(m);
1.1 provos 125: u_char buf[5];
126:
1.121 djm 127: debug3_f("entering, type %d", type);
1.1 provos 128:
1.103 markus 129: if (mlen >= 0xffffffff)
1.121 djm 130: fatal_f("bad length %zu", mlen);
1.103 markus 131: POKE_U32(buf, mlen + 1);
1.10 deraadt 132: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 133: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.121 djm 134: fatal_f("write: %s", strerror(errno));
1.103 markus 135: if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen)
1.121 djm 136: fatal_f("write: %s", strerror(errno));
1.1 provos 137: }
138:
139: void
1.103 markus 140: mm_request_receive(int sock, struct sshbuf *m)
1.1 provos 141: {
1.103 markus 142: u_char buf[4], *p = NULL;
1.13 deraadt 143: u_int msg_len;
1.103 markus 144: int r;
1.1 provos 145:
1.121 djm 146: debug3_f("entering");
1.1 provos 147:
1.40 avsm 148: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
149: if (errno == EPIPE)
1.32 markus 150: cleanup_exit(255);
1.121 djm 151: fatal_f("read: %s", strerror(errno));
1.1 provos 152: }
1.103 markus 153: msg_len = PEEK_U32(buf);
1.1 provos 154: if (msg_len > 256 * 1024)
1.121 djm 155: fatal_f("read: bad msg_len %d", msg_len);
1.103 markus 156: sshbuf_reset(m);
157: if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
1.121 djm 158: fatal_fr(r, "reserve");
1.103 markus 159: if (atomicio(read, sock, p, msg_len) != msg_len)
1.121 djm 160: fatal_f("read: %s", strerror(errno));
1.1 provos 161: }
162:
163: void
1.103 markus 164: mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
1.1 provos 165: {
166: u_char rtype;
1.103 markus 167: int r;
1.1 provos 168:
1.121 djm 169: debug3_f("entering, type %d", type);
1.1 provos 170:
1.36 avsm 171: mm_request_receive(sock, m);
1.103 markus 172: if ((r = sshbuf_get_u8(m, &rtype)) != 0)
1.121 djm 173: fatal_fr(r, "parse");
1.1 provos 174: if (rtype != type)
1.121 djm 175: fatal_f("read: rtype %d != type %d", rtype, type);
1.1 provos 176: }
177:
1.80 markus 178: #ifdef WITH_OPENSSL
1.1 provos 179: DH *
180: mm_choose_dh(int min, int nbits, int max)
181: {
182: BIGNUM *p, *g;
1.103 markus 183: int r;
184: u_char success = 0;
185: struct sshbuf *m;
1.1 provos 186:
1.103 markus 187: if ((m = sshbuf_new()) == NULL)
1.121 djm 188: fatal_f("sshbuf_new failed");
1.103 markus 189: if ((r = sshbuf_put_u32(m, min)) != 0 ||
190: (r = sshbuf_put_u32(m, nbits)) != 0 ||
191: (r = sshbuf_put_u32(m, max)) != 0)
1.121 djm 192: fatal_fr(r, "assemble");
1.1 provos 193:
1.103 markus 194: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
1.1 provos 195:
1.121 djm 196: debug3_f("waiting for MONITOR_ANS_MODULI");
1.103 markus 197: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m);
1.1 provos 198:
1.103 markus 199: if ((r = sshbuf_get_u8(m, &success)) != 0)
1.121 djm 200: fatal_fr(r, "parse success");
1.1 provos 201: if (success == 0)
1.121 djm 202: fatal_f("MONITOR_ANS_MODULI failed");
1.1 provos 203:
1.112 djm 204: if ((r = sshbuf_get_bignum2(m, &p)) != 0 ||
205: (r = sshbuf_get_bignum2(m, &g)) != 0)
1.121 djm 206: fatal_fr(r, "parse group");
1.1 provos 207:
1.121 djm 208: debug3_f("remaining %zu", sshbuf_len(m));
1.103 markus 209: sshbuf_free(m);
1.1 provos 210:
211: return (dh_new_group(g, p));
212: }
1.80 markus 213: #endif
1.1 provos 214:
215: int
1.111 djm 216: mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.114 djm 217: const u_char *data, size_t datalen, const char *hostkey_alg,
1.118 djm 218: const char *sk_provider, const char *sk_pin, u_int compat)
1.1 provos 219: {
1.83 markus 220: struct kex *kex = *pmonitor->m_pkex;
1.103 markus 221: struct sshbuf *m;
1.111 djm 222: u_int ndx = kex->host_key_index(key, 0, ssh);
1.103 markus 223: int r;
1.1 provos 224:
1.121 djm 225: debug3_f("entering");
1.103 markus 226: if ((m = sshbuf_new()) == NULL)
1.121 djm 227: fatal_f("sshbuf_new failed");
1.103 markus 228: if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
229: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
1.106 markus 230: (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
231: (r = sshbuf_put_u32(m, compat)) != 0)
1.121 djm 232: fatal_fr(r, "assemble");
1.1 provos 233:
1.103 markus 234: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
1.1 provos 235:
1.121 djm 236: debug3_f("waiting for MONITOR_ANS_SIGN");
1.103 markus 237: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
1.106 markus 238: if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
1.121 djm 239: fatal_fr(r, "parse");
1.103 markus 240: sshbuf_free(m);
1.1 provos 241:
242: return (0);
243: }
244:
1.122 ! djm 245: #define GETPW(b, id) \
! 246: do { \
! 247: if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0) \
! 248: fatal_fr(r, "parse pw %s", #id); \
! 249: if (len != sizeof(pw->id)) \
! 250: fatal_fr(r, "bad length for %s", #id); \
! 251: memcpy(&pw->id, p, len); \
! 252: } while (0)
! 253:
1.1 provos 254: struct passwd *
1.109 djm 255: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 256: {
1.103 markus 257: struct sshbuf *m;
1.1 provos 258: struct passwd *pw;
1.103 markus 259: size_t len;
260: u_int i;
1.55 dtucker 261: ServerOptions *newopts;
1.103 markus 262: int r;
263: u_char ok;
264: const u_char *p;
1.1 provos 265:
1.121 djm 266: debug3_f("entering");
1.1 provos 267:
1.103 markus 268: if ((m = sshbuf_new()) == NULL)
1.121 djm 269: fatal_f("sshbuf_new failed");
1.103 markus 270: if ((r = sshbuf_put_cstring(m, username)) != 0)
1.121 djm 271: fatal_fr(r, "assemble");
1.1 provos 272:
1.103 markus 273: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 274:
1.121 djm 275: debug3_f("waiting for MONITOR_ANS_PWNAM");
1.103 markus 276: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 277:
1.103 markus 278: if ((r = sshbuf_get_u8(m, &ok)) != 0)
1.121 djm 279: fatal_fr(r, "parse success");
1.103 markus 280: if (ok == 0) {
1.60 dtucker 281: pw = NULL;
282: goto out;
1.1 provos 283: }
1.103 markus 284:
285: pw = xcalloc(sizeof(*pw), 1);
1.122 ! djm 286: GETPW(m, pw_uid);
! 287: GETPW(m, pw_gid);
! 288: GETPW(m, pw_change);
! 289: GETPW(m, pw_expire);
1.103 markus 290: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
291: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
292: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
293: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
294: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
295: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
1.121 djm 296: fatal_fr(r, "parse pw");
1.55 dtucker 297:
1.60 dtucker 298: out:
1.55 dtucker 299: /* copy options block as a Match directive may have changed some */
1.103 markus 300: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
1.121 djm 301: fatal_fr(r, "parse opts");
1.55 dtucker 302: if (len != sizeof(*newopts))
1.121 djm 303: fatal_f("option block size mismatch");
1.103 markus 304: newopts = xcalloc(sizeof(*newopts), 1);
305: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 306:
307: #define M_CP_STROPT(x) do { \
1.121 djm 308: if (newopts->x != NULL && \
309: (r = sshbuf_get_cstring(m, &newopts->x, NULL)) != 0) \
310: fatal_fr(r, "parse %s", #x); \
1.71 djm 311: } while (0)
1.72 djm 312: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 313: newopts->x = newopts->nx == 0 ? \
314: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 315: for (i = 0; i < newopts->nx; i++) { \
316: if ((r = sshbuf_get_cstring(m, \
317: &newopts->x[i], NULL)) != 0) \
1.121 djm 318: fatal_fr(r, "parse %s", #x); \
1.103 markus 319: } \
1.72 djm 320: } while (0)
1.71 djm 321: /* See comment in servconf.h */
322: COPY_MATCH_STRING_OPTS();
323: #undef M_CP_STROPT
1.72 djm 324: #undef M_CP_STRARRAYOPT
1.71 djm 325:
1.55 dtucker 326: copy_set_server_options(&options, newopts, 1);
1.90 djm 327: log_change_level(options.log_level);
1.120 djm 328: log_verbose_reset();
329: for (i = 0; i < options.num_log_verbose; i++)
330: log_verbose_add(options.log_verbose[i]);
1.93 djm 331: process_permitopen(ssh, &options);
1.76 djm 332: free(newopts);
1.55 dtucker 333:
1.103 markus 334: sshbuf_free(m);
1.1 provos 335:
336: return (pw);
1.6 djm 337: }
338:
1.33 markus 339: char *
340: mm_auth2_read_banner(void)
1.6 djm 341: {
1.103 markus 342: struct sshbuf *m;
1.6 djm 343: char *banner;
1.103 markus 344: int r;
1.6 djm 345:
1.121 djm 346: debug3_f("entering");
1.6 djm 347:
1.103 markus 348: if ((m = sshbuf_new()) == NULL)
1.121 djm 349: fatal_f("sshbuf_new failed");
1.103 markus 350: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
351: sshbuf_reset(m);
1.6 djm 352:
1.33 markus 353: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 354: MONITOR_ANS_AUTH2_READ_BANNER, m);
355: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
1.121 djm 356: fatal_fr(r, "parse");
1.103 markus 357: sshbuf_free(m);
1.10 deraadt 358:
1.33 markus 359: /* treat empty banner as missing banner */
360: if (strlen(banner) == 0) {
1.76 djm 361: free(banner);
1.33 markus 362: banner = NULL;
363: }
1.6 djm 364: return (banner);
1.1 provos 365: }
366:
367: /* Inform the privileged process about service and style */
368:
369: void
370: mm_inform_authserv(char *service, char *style)
371: {
1.103 markus 372: struct sshbuf *m;
373: int r;
1.1 provos 374:
1.121 djm 375: debug3_f("entering");
1.1 provos 376:
1.103 markus 377: if ((m = sshbuf_new()) == NULL)
1.121 djm 378: fatal_f("sshbuf_new failed");
1.103 markus 379: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
380: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
1.121 djm 381: fatal_fr(r, "assemble");
1.1 provos 382:
1.103 markus 383: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 384:
1.103 markus 385: sshbuf_free(m);
1.1 provos 386: }
387:
388: /* Do the password authentication */
389: int
1.99 djm 390: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 391: {
1.103 markus 392: struct sshbuf *m;
393: int r, authenticated = 0;
1.1 provos 394:
1.121 djm 395: debug3_f("entering");
1.1 provos 396:
1.103 markus 397: if ((m = sshbuf_new()) == NULL)
1.121 djm 398: fatal_f("sshbuf_new failed");
1.103 markus 399: if ((r = sshbuf_put_cstring(m, password)) != 0)
1.121 djm 400: fatal_fr(r, "assemble");
1.103 markus 401: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 402:
1.121 djm 403: debug3_f("waiting for MONITOR_ANS_AUTHPASSWORD");
1.103 markus 404: mm_request_receive_expect(pmonitor->m_recvfd,
405: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 406:
1.103 markus 407: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 djm 408: fatal_fr(r, "parse");
1.1 provos 409:
1.103 markus 410: sshbuf_free(m);
1.1 provos 411:
1.121 djm 412: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.1 provos 413: return (authenticated);
414: }
415:
416: int
1.99 djm 417: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
418: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 419: {
1.85 djm 420: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 421: pubkey_auth_attempt, authoptp));
1.1 provos 422: }
423:
424: int
1.111 djm 425: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
426: const char *user, const char *host, struct sshkey *key)
1.1 provos 427: {
1.99 djm 428: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 429: }
430:
431: int
1.88 djm 432: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 433: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 434: {
1.103 markus 435: struct sshbuf *m;
1.99 djm 436: int r, allowed = 0;
437: struct sshauthopt *opts = NULL;
1.1 provos 438:
1.121 djm 439: debug3_f("entering");
1.1 provos 440:
1.99 djm 441: if (authoptp != NULL)
442: *authoptp = NULL;
443:
1.103 markus 444: if ((m = sshbuf_new()) == NULL)
1.121 djm 445: fatal_f("sshbuf_new failed");
1.103 markus 446: if ((r = sshbuf_put_u32(m, type)) != 0 ||
447: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
448: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
449: (r = sshkey_puts(key, m)) != 0 ||
450: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
1.121 djm 451: fatal_fr(r, "assemble");
1.1 provos 452:
1.103 markus 453: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 454:
1.121 djm 455: debug3_f("waiting for MONITOR_ANS_KEYALLOWED");
1.99 djm 456: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 457: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 458:
1.103 markus 459: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
1.121 djm 460: fatal_fr(r, "parse");
461: if (allowed && type == MM_USERKEY &&
462: (r = sshauthopt_deserialise(m, &opts)) != 0)
463: fatal_fr(r, "sshauthopt_deserialise");
1.103 markus 464: sshbuf_free(m);
1.1 provos 465:
1.99 djm 466: if (authoptp != NULL) {
467: *authoptp = opts;
468: opts = NULL;
469: }
470: sshauthopt_free(opts);
1.1 provos 471:
1.99 djm 472: return allowed;
1.1 provos 473: }
474:
1.3 markus 475: /*
1.1 provos 476: * This key verify needs to send the key type along, because the
477: * privileged parent makes the decision if the key is allowed
478: * for authentication.
479: */
480:
481: int
1.92 markus 482: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.116 djm 483: const u_char *data, size_t datalen, const char *sigalg, u_int compat,
484: struct sshkey_sig_details **sig_detailsp)
1.1 provos 485: {
1.103 markus 486: struct sshbuf *m;
1.92 markus 487: u_int encoded_ret = 0;
1.103 markus 488: int r;
1.116 djm 489: u_char sig_details_present, flags;
490: u_int counter;
1.1 provos 491:
1.121 djm 492: debug3_f("entering");
1.1 provos 493:
1.116 djm 494: if (sig_detailsp != NULL)
495: *sig_detailsp = NULL;
1.103 markus 496: if ((m = sshbuf_new()) == NULL)
1.121 djm 497: fatal_f("sshbuf_new failed");
1.103 markus 498: if ((r = sshkey_puts(key, m)) != 0 ||
499: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
500: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
501: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
1.121 djm 502: fatal_fr(r, "assemble");
1.1 provos 503:
1.103 markus 504: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 505:
1.121 djm 506: debug3_f("waiting for MONITOR_ANS_KEYVERIFY");
1.103 markus 507: mm_request_receive_expect(pmonitor->m_recvfd,
508: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 509:
1.116 djm 510: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
511: (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
1.121 djm 512: fatal_fr(r, "parse");
1.116 djm 513: if (sig_details_present && encoded_ret == 0) {
514: if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
515: (r = sshbuf_get_u8(m, &flags)) != 0)
1.121 djm 516: fatal_fr(r, "parse sig_details");
1.116 djm 517: if (sig_detailsp != NULL) {
518: *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
519: (*sig_detailsp)->sk_counter = counter;
520: (*sig_detailsp)->sk_flags = flags;
521: }
522: }
1.1 provos 523:
1.103 markus 524: sshbuf_free(m);
1.1 provos 525:
1.92 markus 526: if (encoded_ret != 0)
527: return SSH_ERR_SIGNATURE_INVALID;
528: return 0;
1.1 provos 529: }
530:
531: void
1.111 djm 532: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 533: {
1.82 markus 534: struct sshbuf *m;
535: int r;
536:
537: if ((m = sshbuf_new()) == NULL)
1.121 djm 538: fatal_f("sshbuf_new failed");
1.82 markus 539: if ((r = ssh_packet_get_state(ssh, m)) != 0)
1.121 djm 540: fatal_fr(r, "ssh_packet_get_state");
1.82 markus 541: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.121 djm 542: debug3_f("Finished sending state");
1.82 markus 543: sshbuf_free(m);
1.1 provos 544: }
545:
546: int
1.42 deraadt 547: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 548: {
1.103 markus 549: struct sshbuf *m;
1.39 dtucker 550: char *p, *msg;
1.102 markus 551: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 552:
553: /* Kludge: ensure there are fds free to receive the pty/tty */
554: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
555: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
1.121 djm 556: error_f("cannot allocate fds for pty");
1.62 djm 557: if (tmp1 > 0)
558: close(tmp1);
559: if (tmp2 > 0)
560: close(tmp2);
561: return 0;
562: }
563: close(tmp1);
564: close(tmp2);
1.1 provos 565:
1.103 markus 566: if ((m = sshbuf_new()) == NULL)
1.121 djm 567: fatal_f("sshbuf_new failed");
1.103 markus 568: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 569:
1.121 djm 570: debug3_f("waiting for MONITOR_ANS_PTY");
1.103 markus 571: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 572:
1.103 markus 573: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 djm 574: fatal_fr(r, "parse success");
1.1 provos 575: if (success == 0) {
1.121 djm 576: debug3_f("pty alloc failed");
1.103 markus 577: sshbuf_free(m);
1.1 provos 578: return (0);
579: }
1.103 markus 580: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
581: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
1.121 djm 582: fatal_fr(r, "parse");
1.103 markus 583: sshbuf_free(m);
1.1 provos 584:
585: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 586: free(p);
1.39 dtucker 587:
1.102 markus 588: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
1.121 djm 589: fatal_fr(r, "put loginmsg");
1.76 djm 590: free(msg);
1.1 provos 591:
1.58 djm 592: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
593: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
1.121 djm 594: fatal_f("receive fds failed");
1.1 provos 595:
596: /* Success */
597: return (1);
598: }
599:
600: void
1.32 markus 601: mm_session_pty_cleanup2(Session *s)
1.1 provos 602: {
1.103 markus 603: struct sshbuf *m;
604: int r;
1.1 provos 605:
606: if (s->ttyfd == -1)
607: return;
1.103 markus 608: if ((m = sshbuf_new()) == NULL)
1.121 djm 609: fatal_f("sshbuf_new failed");
1.103 markus 610: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
1.121 djm 611: fatal_fr(r, "assmble");
1.103 markus 612: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
613: sshbuf_free(m);
1.3 markus 614:
1.1 provos 615: /* closed dup'ed master */
1.113 deraadt 616: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.62 djm 617: error("close(s->ptymaster/%d): %s",
618: s->ptymaster, strerror(errno));
1.1 provos 619:
620: /* unlink pty from session */
621: s->ttyfd = -1;
622: }
623:
624: /* Request process termination */
625:
626: void
627: mm_terminate(void)
628: {
1.103 markus 629: struct sshbuf *m;
1.1 provos 630:
1.103 markus 631: if ((m = sshbuf_new()) == NULL)
1.121 djm 632: fatal_f("sshbuf_new failed");
1.103 markus 633: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
634: sshbuf_free(m);
1.1 provos 635: }
636:
1.2 markus 637: static void
1.1 provos 638: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
639: char ***prompts, u_int **echo_on)
640: {
1.10 deraadt 641: *name = xstrdup("");
642: *infotxt = xstrdup("");
1.1 provos 643: *numprompts = 1;
1.43 djm 644: *prompts = xcalloc(*numprompts, sizeof(char *));
645: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 646: (*echo_on)[0] = 0;
647: }
648:
649: int
650: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
651: u_int *numprompts, char ***prompts, u_int **echo_on)
652: {
1.103 markus 653: struct sshbuf *m;
1.21 markus 654: u_int success;
1.1 provos 655: char *challenge;
1.103 markus 656: int r;
1.1 provos 657:
1.121 djm 658: debug3_f("entering");
1.1 provos 659:
1.103 markus 660: if ((m = sshbuf_new()) == NULL)
1.121 djm 661: fatal_f("sshbuf_new failed");
1.103 markus 662: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 663:
1.103 markus 664: mm_request_receive_expect(pmonitor->m_recvfd,
665: MONITOR_ANS_BSDAUTHQUERY, m);
666: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 djm 667: fatal_fr(r, "parse success");
1.21 markus 668: if (success == 0) {
1.121 djm 669: debug3_f("no challenge");
1.103 markus 670: sshbuf_free(m);
1.1 provos 671: return (-1);
672: }
673:
674: /* Get the challenge, and format the response */
1.103 markus 675: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
1.121 djm 676: fatal_fr(r, "parse challenge");
1.103 markus 677: sshbuf_free(m);
1.1 provos 678:
679: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
680: (*prompts)[0] = challenge;
681:
1.121 djm 682: debug3_f("received challenge: %s", challenge);
1.1 provos 683:
684: return (0);
685: }
686:
687: int
688: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
689: {
1.103 markus 690: struct sshbuf *m;
691: int r, authok;
1.1 provos 692:
1.121 djm 693: debug3_f("entering");
1.1 provos 694: if (numresponses != 1)
695: return (-1);
696:
1.103 markus 697: if ((m = sshbuf_new()) == NULL)
1.121 djm 698: fatal_f("sshbuf_new failed");
1.103 markus 699: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
1.121 djm 700: fatal_fr(r, "assemble");
1.103 markus 701: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 702:
1.7 mouring 703: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 704: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 705:
1.103 markus 706: if ((r = sshbuf_get_u32(m, &authok)) != 0)
1.121 djm 707: fatal_fr(r, "parse");
1.103 markus 708: sshbuf_free(m);
1.1 provos 709:
710: return ((authok == 0) ? -1 : 0);
711: }
1.29 markus 712:
713: #ifdef GSSAPI
714: OM_uint32
1.36 avsm 715: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 716: {
1.103 markus 717: struct sshbuf *m;
1.29 markus 718: OM_uint32 major;
1.103 markus 719: int r;
1.29 markus 720:
721: /* Client doesn't get to see the context */
722: *ctx = NULL;
723:
1.103 markus 724: if ((m = sshbuf_new()) == NULL)
1.121 djm 725: fatal_f("sshbuf_new failed");
1.103 markus 726: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
1.121 djm 727: fatal_fr(r, "assemble");
1.29 markus 728:
1.103 markus 729: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
730: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 731:
1.103 markus 732: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 djm 733: fatal_fr(r, "parse");
1.29 markus 734:
1.103 markus 735: sshbuf_free(m);
1.29 markus 736: return (major);
737: }
738:
739: OM_uint32
740: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 741: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 742: {
1.103 markus 743: struct sshbuf *m;
1.29 markus 744: OM_uint32 major;
1.103 markus 745: u_int flags;
746: int r;
1.29 markus 747:
1.103 markus 748: if ((m = sshbuf_new()) == NULL)
1.121 djm 749: fatal_f("sshbuf_new failed");
1.103 markus 750: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
1.121 djm 751: fatal_fr(r, "assemble");
1.29 markus 752:
1.103 markus 753: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
754: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 755:
1.103 markus 756: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 757: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.121 djm 758: fatal_fr(r, "parse");
1.103 markus 759: if (flagsp != NULL) {
760: if ((r = sshbuf_get_u32(m, &flags)) != 0)
1.121 djm 761: fatal_fr(r, "parse flags");
1.103 markus 762: *flagsp = flags;
763: }
1.29 markus 764:
1.103 markus 765: sshbuf_free(m);
1.29 markus 766:
767: return (major);
1.35 markus 768: }
769:
770: OM_uint32
771: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
772: {
1.103 markus 773: struct sshbuf *m;
1.35 markus 774: OM_uint32 major;
1.103 markus 775: int r;
776:
777: if ((m = sshbuf_new()) == NULL)
1.121 djm 778: fatal_f("sshbuf_new failed");
1.103 markus 779: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
780: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
1.121 djm 781: fatal_fr(r, "assemble");
1.35 markus 782:
1.103 markus 783: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
784: mm_request_receive_expect(pmonitor->m_recvfd,
785: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 786:
1.103 markus 787: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 djm 788: fatal_fr(r, "parse");
1.103 markus 789: sshbuf_free(m);
1.35 markus 790: return(major);
1.29 markus 791: }
792:
793: int
794: mm_ssh_gssapi_userok(char *user)
795: {
1.103 markus 796: struct sshbuf *m;
797: int r, authenticated = 0;
1.29 markus 798:
1.103 markus 799: if ((m = sshbuf_new()) == NULL)
1.121 djm 800: fatal_f("sshbuf_new failed");
1.29 markus 801:
1.103 markus 802: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
803: mm_request_receive_expect(pmonitor->m_recvfd,
804: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 805:
1.103 markus 806: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 djm 807: fatal_fr(r, "parse");
1.29 markus 808:
1.103 markus 809: sshbuf_free(m);
1.121 djm 810: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.29 markus 811: return (authenticated);
812: }
813: #endif /* GSSAPI */
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