Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.121
1.121 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.120 2020/10/16 13:26:13 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:
245: struct passwd *
1.109 djm 246: mm_getpwnamallow(struct ssh *ssh, const char *username)
1.1 provos 247: {
1.103 markus 248: struct sshbuf *m;
1.1 provos 249: struct passwd *pw;
1.103 markus 250: size_t len;
251: u_int i;
1.55 dtucker 252: ServerOptions *newopts;
1.103 markus 253: int r;
254: u_char ok;
255: const u_char *p;
1.1 provos 256:
1.121 ! djm 257: debug3_f("entering");
1.1 provos 258:
1.103 markus 259: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 260: fatal_f("sshbuf_new failed");
1.103 markus 261: if ((r = sshbuf_put_cstring(m, username)) != 0)
1.121 ! djm 262: fatal_fr(r, "assemble");
1.1 provos 263:
1.103 markus 264: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
1.1 provos 265:
1.121 ! djm 266: debug3_f("waiting for MONITOR_ANS_PWNAM");
1.103 markus 267: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
1.1 provos 268:
1.103 markus 269: if ((r = sshbuf_get_u8(m, &ok)) != 0)
1.121 ! djm 270: fatal_fr(r, "parse success");
1.103 markus 271: if (ok == 0) {
1.60 dtucker 272: pw = NULL;
273: goto out;
1.1 provos 274: }
1.103 markus 275:
276: /* XXX don't like passing struct passwd like this */
277: pw = xcalloc(sizeof(*pw), 1);
278: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
1.121 ! djm 279: fatal_fr(r, "parse");
1.103 markus 280: if (len != sizeof(*pw))
1.121 ! djm 281: fatal_f("struct passwd size mismatch");
1.103 markus 282: memcpy(pw, p, sizeof(*pw));
283:
284: if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
285: (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
286: (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
287: (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
288: (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
289: (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
1.121 ! djm 290: fatal_fr(r, "parse pw");
1.55 dtucker 291:
1.60 dtucker 292: out:
1.55 dtucker 293: /* copy options block as a Match directive may have changed some */
1.103 markus 294: if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
1.121 ! djm 295: fatal_fr(r, "parse opts");
1.55 dtucker 296: if (len != sizeof(*newopts))
1.121 ! djm 297: fatal_f("option block size mismatch");
1.103 markus 298: newopts = xcalloc(sizeof(*newopts), 1);
299: memcpy(newopts, p, sizeof(*newopts));
1.71 djm 300:
301: #define M_CP_STROPT(x) do { \
1.121 ! djm 302: if (newopts->x != NULL && \
! 303: (r = sshbuf_get_cstring(m, &newopts->x, NULL)) != 0) \
! 304: fatal_fr(r, "parse %s", #x); \
1.71 djm 305: } while (0)
1.72 djm 306: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 307: newopts->x = newopts->nx == 0 ? \
308: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.103 markus 309: for (i = 0; i < newopts->nx; i++) { \
310: if ((r = sshbuf_get_cstring(m, \
311: &newopts->x[i], NULL)) != 0) \
1.121 ! djm 312: fatal_fr(r, "parse %s", #x); \
1.103 markus 313: } \
1.72 djm 314: } while (0)
1.71 djm 315: /* See comment in servconf.h */
316: COPY_MATCH_STRING_OPTS();
317: #undef M_CP_STROPT
1.72 djm 318: #undef M_CP_STRARRAYOPT
1.71 djm 319:
1.55 dtucker 320: copy_set_server_options(&options, newopts, 1);
1.90 djm 321: log_change_level(options.log_level);
1.120 djm 322: log_verbose_reset();
323: for (i = 0; i < options.num_log_verbose; i++)
324: log_verbose_add(options.log_verbose[i]);
1.93 djm 325: process_permitopen(ssh, &options);
1.76 djm 326: free(newopts);
1.55 dtucker 327:
1.103 markus 328: sshbuf_free(m);
1.1 provos 329:
330: return (pw);
1.6 djm 331: }
332:
1.33 markus 333: char *
334: mm_auth2_read_banner(void)
1.6 djm 335: {
1.103 markus 336: struct sshbuf *m;
1.6 djm 337: char *banner;
1.103 markus 338: int r;
1.6 djm 339:
1.121 ! djm 340: debug3_f("entering");
1.6 djm 341:
1.103 markus 342: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 343: fatal_f("sshbuf_new failed");
1.103 markus 344: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
345: sshbuf_reset(m);
1.6 djm 346:
1.33 markus 347: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 348: MONITOR_ANS_AUTH2_READ_BANNER, m);
349: if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
1.121 ! djm 350: fatal_fr(r, "parse");
1.103 markus 351: sshbuf_free(m);
1.10 deraadt 352:
1.33 markus 353: /* treat empty banner as missing banner */
354: if (strlen(banner) == 0) {
1.76 djm 355: free(banner);
1.33 markus 356: banner = NULL;
357: }
1.6 djm 358: return (banner);
1.1 provos 359: }
360:
361: /* Inform the privileged process about service and style */
362:
363: void
364: mm_inform_authserv(char *service, char *style)
365: {
1.103 markus 366: struct sshbuf *m;
367: int r;
1.1 provos 368:
1.121 ! djm 369: debug3_f("entering");
1.1 provos 370:
1.103 markus 371: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 372: fatal_f("sshbuf_new failed");
1.103 markus 373: if ((r = sshbuf_put_cstring(m, service)) != 0 ||
374: (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
1.121 ! djm 375: fatal_fr(r, "assemble");
1.1 provos 376:
1.103 markus 377: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
1.1 provos 378:
1.103 markus 379: sshbuf_free(m);
1.1 provos 380: }
381:
382: /* Do the password authentication */
383: int
1.99 djm 384: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 385: {
1.103 markus 386: struct sshbuf *m;
387: int r, authenticated = 0;
1.1 provos 388:
1.121 ! djm 389: debug3_f("entering");
1.1 provos 390:
1.103 markus 391: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 392: fatal_f("sshbuf_new failed");
1.103 markus 393: if ((r = sshbuf_put_cstring(m, password)) != 0)
1.121 ! djm 394: fatal_fr(r, "assemble");
1.103 markus 395: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
1.1 provos 396:
1.121 ! djm 397: debug3_f("waiting for MONITOR_ANS_AUTHPASSWORD");
1.103 markus 398: mm_request_receive_expect(pmonitor->m_recvfd,
399: MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 400:
1.103 markus 401: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 ! djm 402: fatal_fr(r, "parse");
1.1 provos 403:
1.103 markus 404: sshbuf_free(m);
1.1 provos 405:
1.121 ! djm 406: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.1 provos 407: return (authenticated);
408: }
409:
410: int
1.99 djm 411: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
412: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 413: {
1.85 djm 414: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 415: pubkey_auth_attempt, authoptp));
1.1 provos 416: }
417:
418: int
1.111 djm 419: mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
420: const char *user, const char *host, struct sshkey *key)
1.1 provos 421: {
1.99 djm 422: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 423: }
424:
425: int
1.88 djm 426: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 427: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 428: {
1.103 markus 429: struct sshbuf *m;
1.99 djm 430: int r, allowed = 0;
431: struct sshauthopt *opts = NULL;
1.1 provos 432:
1.121 ! djm 433: debug3_f("entering");
1.1 provos 434:
1.99 djm 435: if (authoptp != NULL)
436: *authoptp = NULL;
437:
1.103 markus 438: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 439: fatal_f("sshbuf_new failed");
1.103 markus 440: if ((r = sshbuf_put_u32(m, type)) != 0 ||
441: (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
442: (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
443: (r = sshkey_puts(key, m)) != 0 ||
444: (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
1.121 ! djm 445: fatal_fr(r, "assemble");
1.1 provos 446:
1.103 markus 447: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
1.1 provos 448:
1.121 ! djm 449: debug3_f("waiting for MONITOR_ANS_KEYALLOWED");
1.99 djm 450: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 451: MONITOR_ANS_KEYALLOWED, m);
1.1 provos 452:
1.103 markus 453: if ((r = sshbuf_get_u32(m, &allowed)) != 0)
1.121 ! djm 454: fatal_fr(r, "parse");
! 455: if (allowed && type == MM_USERKEY &&
! 456: (r = sshauthopt_deserialise(m, &opts)) != 0)
! 457: fatal_fr(r, "sshauthopt_deserialise");
1.103 markus 458: sshbuf_free(m);
1.1 provos 459:
1.99 djm 460: if (authoptp != NULL) {
461: *authoptp = opts;
462: opts = NULL;
463: }
464: sshauthopt_free(opts);
1.1 provos 465:
1.99 djm 466: return allowed;
1.1 provos 467: }
468:
1.3 markus 469: /*
1.1 provos 470: * This key verify needs to send the key type along, because the
471: * privileged parent makes the decision if the key is allowed
472: * for authentication.
473: */
474:
475: int
1.92 markus 476: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.116 djm 477: const u_char *data, size_t datalen, const char *sigalg, u_int compat,
478: struct sshkey_sig_details **sig_detailsp)
1.1 provos 479: {
1.103 markus 480: struct sshbuf *m;
1.92 markus 481: u_int encoded_ret = 0;
1.103 markus 482: int r;
1.116 djm 483: u_char sig_details_present, flags;
484: u_int counter;
1.1 provos 485:
1.121 ! djm 486: debug3_f("entering");
1.1 provos 487:
1.116 djm 488: if (sig_detailsp != NULL)
489: *sig_detailsp = NULL;
1.103 markus 490: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 491: fatal_f("sshbuf_new failed");
1.103 markus 492: if ((r = sshkey_puts(key, m)) != 0 ||
493: (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
494: (r = sshbuf_put_string(m, data, datalen)) != 0 ||
495: (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
1.121 ! djm 496: fatal_fr(r, "assemble");
1.1 provos 497:
1.103 markus 498: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
1.1 provos 499:
1.121 ! djm 500: debug3_f("waiting for MONITOR_ANS_KEYVERIFY");
1.103 markus 501: mm_request_receive_expect(pmonitor->m_recvfd,
502: MONITOR_ANS_KEYVERIFY, m);
1.1 provos 503:
1.116 djm 504: if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
505: (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
1.121 ! djm 506: fatal_fr(r, "parse");
1.116 djm 507: if (sig_details_present && encoded_ret == 0) {
508: if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
509: (r = sshbuf_get_u8(m, &flags)) != 0)
1.121 ! djm 510: fatal_fr(r, "parse sig_details");
1.116 djm 511: if (sig_detailsp != NULL) {
512: *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
513: (*sig_detailsp)->sk_counter = counter;
514: (*sig_detailsp)->sk_flags = flags;
515: }
516: }
1.1 provos 517:
1.103 markus 518: sshbuf_free(m);
1.1 provos 519:
1.92 markus 520: if (encoded_ret != 0)
521: return SSH_ERR_SIGNATURE_INVALID;
522: return 0;
1.1 provos 523: }
524:
525: void
1.111 djm 526: mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
1.1 provos 527: {
1.82 markus 528: struct sshbuf *m;
529: int r;
530:
531: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 532: fatal_f("sshbuf_new failed");
1.82 markus 533: if ((r = ssh_packet_get_state(ssh, m)) != 0)
1.121 ! djm 534: fatal_fr(r, "ssh_packet_get_state");
1.82 markus 535: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.121 ! djm 536: debug3_f("Finished sending state");
1.82 markus 537: sshbuf_free(m);
1.1 provos 538: }
539:
540: int
1.42 deraadt 541: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 542: {
1.103 markus 543: struct sshbuf *m;
1.39 dtucker 544: char *p, *msg;
1.102 markus 545: int success = 0, tmp1 = -1, tmp2 = -1, r;
1.62 djm 546:
547: /* Kludge: ensure there are fds free to receive the pty/tty */
548: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
549: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
1.121 ! djm 550: error_f("cannot allocate fds for pty");
1.62 djm 551: if (tmp1 > 0)
552: close(tmp1);
553: if (tmp2 > 0)
554: close(tmp2);
555: return 0;
556: }
557: close(tmp1);
558: close(tmp2);
1.1 provos 559:
1.103 markus 560: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 561: fatal_f("sshbuf_new failed");
1.103 markus 562: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
1.1 provos 563:
1.121 ! djm 564: debug3_f("waiting for MONITOR_ANS_PTY");
1.103 markus 565: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
1.1 provos 566:
1.103 markus 567: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 ! djm 568: fatal_fr(r, "parse success");
1.1 provos 569: if (success == 0) {
1.121 ! djm 570: debug3_f("pty alloc failed");
1.103 markus 571: sshbuf_free(m);
1.1 provos 572: return (0);
573: }
1.103 markus 574: if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
575: (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
1.121 ! djm 576: fatal_fr(r, "parse");
1.103 markus 577: sshbuf_free(m);
1.1 provos 578:
579: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 580: free(p);
1.39 dtucker 581:
1.102 markus 582: if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
1.121 ! djm 583: fatal_fr(r, "put loginmsg");
1.76 djm 584: free(msg);
1.1 provos 585:
1.58 djm 586: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
587: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
1.121 ! djm 588: fatal_f("receive fds failed");
1.1 provos 589:
590: /* Success */
591: return (1);
592: }
593:
594: void
1.32 markus 595: mm_session_pty_cleanup2(Session *s)
1.1 provos 596: {
1.103 markus 597: struct sshbuf *m;
598: int r;
1.1 provos 599:
600: if (s->ttyfd == -1)
601: return;
1.103 markus 602: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 603: fatal_f("sshbuf_new failed");
1.103 markus 604: if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
1.121 ! djm 605: fatal_fr(r, "assmble");
1.103 markus 606: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
607: sshbuf_free(m);
1.3 markus 608:
1.1 provos 609: /* closed dup'ed master */
1.113 deraadt 610: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.62 djm 611: error("close(s->ptymaster/%d): %s",
612: s->ptymaster, strerror(errno));
1.1 provos 613:
614: /* unlink pty from session */
615: s->ttyfd = -1;
616: }
617:
618: /* Request process termination */
619:
620: void
621: mm_terminate(void)
622: {
1.103 markus 623: struct sshbuf *m;
1.1 provos 624:
1.103 markus 625: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 626: fatal_f("sshbuf_new failed");
1.103 markus 627: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
628: sshbuf_free(m);
1.1 provos 629: }
630:
1.2 markus 631: static void
1.1 provos 632: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
633: char ***prompts, u_int **echo_on)
634: {
1.10 deraadt 635: *name = xstrdup("");
636: *infotxt = xstrdup("");
1.1 provos 637: *numprompts = 1;
1.43 djm 638: *prompts = xcalloc(*numprompts, sizeof(char *));
639: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 640: (*echo_on)[0] = 0;
641: }
642:
643: int
644: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
645: u_int *numprompts, char ***prompts, u_int **echo_on)
646: {
1.103 markus 647: struct sshbuf *m;
1.21 markus 648: u_int success;
1.1 provos 649: char *challenge;
1.103 markus 650: int r;
1.1 provos 651:
1.121 ! djm 652: debug3_f("entering");
1.1 provos 653:
1.103 markus 654: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 655: fatal_f("sshbuf_new failed");
1.103 markus 656: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
1.1 provos 657:
1.103 markus 658: mm_request_receive_expect(pmonitor->m_recvfd,
659: MONITOR_ANS_BSDAUTHQUERY, m);
660: if ((r = sshbuf_get_u32(m, &success)) != 0)
1.121 ! djm 661: fatal_fr(r, "parse success");
1.21 markus 662: if (success == 0) {
1.121 ! djm 663: debug3_f("no challenge");
1.103 markus 664: sshbuf_free(m);
1.1 provos 665: return (-1);
666: }
667:
668: /* Get the challenge, and format the response */
1.103 markus 669: if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
1.121 ! djm 670: fatal_fr(r, "parse challenge");
1.103 markus 671: sshbuf_free(m);
1.1 provos 672:
673: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
674: (*prompts)[0] = challenge;
675:
1.121 ! djm 676: debug3_f("received challenge: %s", challenge);
1.1 provos 677:
678: return (0);
679: }
680:
681: int
682: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
683: {
1.103 markus 684: struct sshbuf *m;
685: int r, authok;
1.1 provos 686:
1.121 ! djm 687: debug3_f("entering");
1.1 provos 688: if (numresponses != 1)
689: return (-1);
690:
1.103 markus 691: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 692: fatal_f("sshbuf_new failed");
1.103 markus 693: if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
1.121 ! djm 694: fatal_fr(r, "assemble");
1.103 markus 695: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
1.1 provos 696:
1.7 mouring 697: mm_request_receive_expect(pmonitor->m_recvfd,
1.103 markus 698: MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 699:
1.103 markus 700: if ((r = sshbuf_get_u32(m, &authok)) != 0)
1.121 ! djm 701: fatal_fr(r, "parse");
1.103 markus 702: sshbuf_free(m);
1.1 provos 703:
704: return ((authok == 0) ? -1 : 0);
705: }
1.29 markus 706:
707: #ifdef GSSAPI
708: OM_uint32
1.36 avsm 709: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 710: {
1.103 markus 711: struct sshbuf *m;
1.29 markus 712: OM_uint32 major;
1.103 markus 713: int r;
1.29 markus 714:
715: /* Client doesn't get to see the context */
716: *ctx = NULL;
717:
1.103 markus 718: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 719: fatal_f("sshbuf_new failed");
1.103 markus 720: if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
1.121 ! djm 721: fatal_fr(r, "assemble");
1.29 markus 722:
1.103 markus 723: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
724: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1.29 markus 725:
1.103 markus 726: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 ! djm 727: fatal_fr(r, "parse");
1.29 markus 728:
1.103 markus 729: sshbuf_free(m);
1.29 markus 730: return (major);
731: }
732:
733: OM_uint32
734: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1.103 markus 735: gss_buffer_desc *out, OM_uint32 *flagsp)
1.29 markus 736: {
1.103 markus 737: struct sshbuf *m;
1.29 markus 738: OM_uint32 major;
1.103 markus 739: u_int flags;
740: int r;
1.29 markus 741:
1.103 markus 742: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 743: fatal_f("sshbuf_new failed");
1.103 markus 744: if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
1.121 ! djm 745: fatal_fr(r, "assemble");
1.29 markus 746:
1.103 markus 747: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
748: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1.29 markus 749:
1.103 markus 750: if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1.104 djm 751: (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1.121 ! djm 752: fatal_fr(r, "parse");
1.103 markus 753: if (flagsp != NULL) {
754: if ((r = sshbuf_get_u32(m, &flags)) != 0)
1.121 ! djm 755: fatal_fr(r, "parse flags");
1.103 markus 756: *flagsp = flags;
757: }
1.29 markus 758:
1.103 markus 759: sshbuf_free(m);
1.29 markus 760:
761: return (major);
1.35 markus 762: }
763:
764: OM_uint32
765: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
766: {
1.103 markus 767: struct sshbuf *m;
1.35 markus 768: OM_uint32 major;
1.103 markus 769: int r;
770:
771: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 772: fatal_f("sshbuf_new failed");
1.103 markus 773: if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
774: (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
1.121 ! djm 775: fatal_fr(r, "assemble");
1.35 markus 776:
1.103 markus 777: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
778: mm_request_receive_expect(pmonitor->m_recvfd,
779: MONITOR_ANS_GSSCHECKMIC, m);
1.35 markus 780:
1.103 markus 781: if ((r = sshbuf_get_u32(m, &major)) != 0)
1.121 ! djm 782: fatal_fr(r, "parse");
1.103 markus 783: sshbuf_free(m);
1.35 markus 784: return(major);
1.29 markus 785: }
786:
787: int
788: mm_ssh_gssapi_userok(char *user)
789: {
1.103 markus 790: struct sshbuf *m;
791: int r, authenticated = 0;
1.29 markus 792:
1.103 markus 793: if ((m = sshbuf_new()) == NULL)
1.121 ! djm 794: fatal_f("sshbuf_new failed");
1.29 markus 795:
1.103 markus 796: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
797: mm_request_receive_expect(pmonitor->m_recvfd,
798: MONITOR_ANS_GSSUSEROK, m);
1.29 markus 799:
1.103 markus 800: if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1.121 ! djm 801: fatal_fr(r, "parse");
1.29 markus 802:
1.103 markus 803: sshbuf_free(m);
1.121 ! djm 804: debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1.29 markus 805: return (authenticated);
806: }
807: #endif /* GSSAPI */
![[BACK]](/icons/back.gif){kind=icon}
Return to monitor_wrap.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh