X-Git-Url: http://www.project-moonshot.org/gitweb/?a=blobdiff_plain;f=.pc%2F0001-initial-empty-usernames-on-top-of-keyex-and-role.patch%2Fmonitor_wrap.c;fp=.pc%2F0001-initial-empty-usernames-on-top-of-keyex-and-role.patch%2Fmonitor_wrap.c;h=f46be660d68198c529a4da80de302ead654ff60a;hb=5fb5d3075dd41dd6897367de230850ea4bb04240;hp=0000000000000000000000000000000000000000;hpb=fa76dbe8547968c5e25298d4187ce71264f4e00e;p=openssh.git diff --git a/.pc/0001-initial-empty-usernames-on-top-of-keyex-and-role.patch/monitor_wrap.c b/.pc/0001-initial-empty-usernames-on-top-of-keyex-and-role.patch/monitor_wrap.c new file mode 100644 index 0000000..f46be66 --- /dev/null +++ b/.pc/0001-initial-empty-usernames-on-top-of-keyex-and-role.patch/monitor_wrap.c @@ -0,0 +1,1515 @@ +/* $OpenBSD: monitor_wrap.c,v 1.73 2011/06/17 21:44:31 djm Exp $ */ +/* + * Copyright 2002 Niels Provos + * Copyright 2002 Markus Friedl + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "includes.h" + +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "openbsd-compat/sys-queue.h" +#include "xmalloc.h" +#include "ssh.h" +#include "dh.h" +#include "buffer.h" +#include "key.h" +#include "cipher.h" +#include "kex.h" +#include "hostfile.h" +#include "auth.h" +#include "auth-options.h" +#include "packet.h" +#include "mac.h" +#include "log.h" +#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ +#undef TARGET_OS_MAC +#include "zlib.h" +#define TARGET_OS_MAC 1 +#else +#include "zlib.h" +#endif +#include "monitor.h" +#ifdef GSSAPI +#include "ssh-gss.h" +#endif +#include "monitor_wrap.h" +#include "atomicio.h" +#include "monitor_fdpass.h" +#include "misc.h" +#include "schnorr.h" +#include "jpake.h" +#include "uuencode.h" + +#include "channels.h" +#include "session.h" +#include "servconf.h" +#include "roaming.h" + +/* Imports */ +extern int compat20; +extern z_stream incoming_stream; +extern z_stream outgoing_stream; +extern struct monitor *pmonitor; +extern Buffer loginmsg; +extern ServerOptions options; + +void +mm_log_handler(LogLevel level, const char *msg, void *ctx) +{ + Buffer log_msg; + struct monitor *mon = (struct monitor *)ctx; + + if (mon->m_log_sendfd == -1) + fatal("%s: no log channel", __func__); + + buffer_init(&log_msg); + /* + * Placeholder for packet length. Will be filled in with the actual + * packet length once the packet has been constucted. This saves + * fragile math. + */ + buffer_put_int(&log_msg, 0); + + buffer_put_int(&log_msg, level); + buffer_put_cstring(&log_msg, msg); + put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4); + if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg), + buffer_len(&log_msg)) != buffer_len(&log_msg)) + fatal("%s: write: %s", __func__, strerror(errno)); + buffer_free(&log_msg); +} + +int +mm_is_monitor(void) +{ + /* + * m_pid is only set in the privileged part, and + * points to the unprivileged child. + */ + return (pmonitor && pmonitor->m_pid > 0); +} + +void +mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) +{ + u_int mlen = buffer_len(m); + u_char buf[5]; + + debug3("%s entering: type %d", __func__, type); + + put_u32(buf, mlen + 1); + buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ + if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) + fatal("%s: write: %s", __func__, strerror(errno)); + if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) + fatal("%s: write: %s", __func__, strerror(errno)); +} + +void +mm_request_receive(int sock, Buffer *m) +{ + u_char buf[4]; + u_int msg_len; + + debug3("%s entering", __func__); + + if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { + if (errno == EPIPE) + cleanup_exit(255); + fatal("%s: read: %s", __func__, strerror(errno)); + } + msg_len = get_u32(buf); + if (msg_len > 256 * 1024) + fatal("%s: read: bad msg_len %d", __func__, msg_len); + buffer_clear(m); + buffer_append_space(m, msg_len); + if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) + fatal("%s: read: %s", __func__, strerror(errno)); +} + +void +mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) +{ + u_char rtype; + + debug3("%s entering: type %d", __func__, type); + + mm_request_receive(sock, m); + rtype = buffer_get_char(m); + if (rtype != type) + fatal("%s: read: rtype %d != type %d", __func__, + rtype, type); +} + +DH * +mm_choose_dh(int min, int nbits, int max) +{ + BIGNUM *p, *g; + int success = 0; + Buffer m; + + buffer_init(&m); + buffer_put_int(&m, min); + buffer_put_int(&m, nbits); + buffer_put_int(&m, max); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); + + debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); + + success = buffer_get_char(&m); + if (success == 0) + fatal("%s: MONITOR_ANS_MODULI failed", __func__); + + if ((p = BN_new()) == NULL) + fatal("%s: BN_new failed", __func__); + if ((g = BN_new()) == NULL) + fatal("%s: BN_new failed", __func__); + buffer_get_bignum2(&m, p); + buffer_get_bignum2(&m, g); + + debug3("%s: remaining %d", __func__, buffer_len(&m)); + buffer_free(&m); + + return (dh_new_group(g, p)); +} + +int +mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) +{ + Kex *kex = *pmonitor->m_pkex; + Buffer m; + + debug3("%s entering", __func__); + + buffer_init(&m); + buffer_put_int(&m, kex->host_key_index(key)); + buffer_put_string(&m, data, datalen); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); + + debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); + *sigp = buffer_get_string(&m, lenp); + buffer_free(&m); + + return (0); +} + +struct passwd * +mm_getpwnamallow(const char *username) +{ + Buffer m; + struct passwd *pw; + u_int len, i; + ServerOptions *newopts; + + debug3("%s entering", __func__); + + buffer_init(&m); + buffer_put_cstring(&m, username); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); + + debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); + + if (buffer_get_char(&m) == 0) { + pw = NULL; + goto out; + } + pw = buffer_get_string(&m, &len); + if (len != sizeof(struct passwd)) + fatal("%s: struct passwd size mismatch", __func__); + pw->pw_name = buffer_get_string(&m, NULL); + pw->pw_passwd = buffer_get_string(&m, NULL); + pw->pw_gecos = buffer_get_string(&m, NULL); +#ifdef HAVE_PW_CLASS_IN_PASSWD + pw->pw_class = buffer_get_string(&m, NULL); +#endif + pw->pw_dir = buffer_get_string(&m, NULL); + pw->pw_shell = buffer_get_string(&m, NULL); + +out: + /* copy options block as a Match directive may have changed some */ + newopts = buffer_get_string(&m, &len); + if (len != sizeof(*newopts)) + fatal("%s: option block size mismatch", __func__); + +#define M_CP_STROPT(x) do { \ + if (newopts->x != NULL) \ + newopts->x = buffer_get_string(&m, NULL); \ + } while (0) +#define M_CP_STRARRAYOPT(x, nx) do { \ + for (i = 0; i < newopts->nx; i++) \ + newopts->x[i] = buffer_get_string(&m, NULL); \ + } while (0) + /* See comment in servconf.h */ + COPY_MATCH_STRING_OPTS(); +#undef M_CP_STROPT +#undef M_CP_STRARRAYOPT + + copy_set_server_options(&options, newopts, 1); + xfree(newopts); + + buffer_free(&m); + + return (pw); +} + +char * +mm_auth2_read_banner(void) +{ + Buffer m; + char *banner; + + debug3("%s entering", __func__); + + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); + buffer_clear(&m); + + mm_request_receive_expect(pmonitor->m_recvfd, + MONITOR_ANS_AUTH2_READ_BANNER, &m); + banner = buffer_get_string(&m, NULL); + buffer_free(&m); + + /* treat empty banner as missing banner */ + if (strlen(banner) == 0) { + xfree(banner); + banner = NULL; + } + return (banner); +} + +/* Inform the privileged process about service, style, and role */ + +void +mm_inform_authserv(char *service, char *style, char *role) +{ + Buffer m; + + debug3("%s entering", __func__); + + buffer_init(&m); + buffer_put_cstring(&m, service); + buffer_put_cstring(&m, style ? style : ""); + buffer_put_cstring(&m, role ? role : ""); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); + + buffer_free(&m); +} + +/* Inform the privileged process about role */ + +void +mm_inform_authrole(char *role) +{ + Buffer m; + + debug3("%s entering", __func__); + + buffer_init(&m); + buffer_put_cstring(&m, role ? role : ""); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHROLE, &m); + + buffer_free(&m); +} + +/* Do the password authentication */ +int +mm_auth_password(Authctxt *authctxt, char *password) +{ + Buffer m; + int authenticated = 0; + + debug3("%s entering", __func__); + + buffer_init(&m); + buffer_put_cstring(&m, password); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); + + debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); + + authenticated = buffer_get_int(&m); + + buffer_free(&m); + + debug3("%s: user %sauthenticated", + __func__, authenticated ? "" : "not "); + return (authenticated); +} + +int +mm_user_key_allowed(struct passwd *pw, Key *key) +{ + return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); +} + +int +mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, + Key *key) +{ + return (mm_key_allowed(MM_HOSTKEY, user, host, key)); +} + +int +mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, + char *host, Key *key) +{ + int ret; + + key->type = KEY_RSA; /* XXX hack for key_to_blob */ + ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); + key->type = KEY_RSA1; + return (ret); +} + +int +mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) +{ + Buffer m; + u_char *blob; + u_int len; + int allowed = 0, have_forced = 0; + + debug3("%s entering", __func__); + + /* Convert the key to a blob and the pass it over */ + if (!key_to_blob(key, &blob, &len)) + return (0); + + buffer_init(&m); + buffer_put_int(&m, type); + buffer_put_cstring(&m, user ? user : ""); + buffer_put_cstring(&m, host ? host : ""); + buffer_put_string(&m, blob, len); + xfree(blob); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); + + debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); + + allowed = buffer_get_int(&m); + + /* fake forced command */ + auth_clear_options(); + have_forced = buffer_get_int(&m); + forced_command = have_forced ? xstrdup("true") : NULL; + + buffer_free(&m); + + return (allowed); +} + +/* + * This key verify needs to send the key type along, because the + * privileged parent makes the decision if the key is allowed + * for authentication. + */ + +int +mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) +{ + Buffer m; + u_char *blob; + u_int len; + int verified = 0; + + debug3("%s entering", __func__); + + /* Convert the key to a blob and the pass it over */ + if (!key_to_blob(key, &blob, &len)) + return (0); + + buffer_init(&m); + buffer_put_string(&m, blob, len); + buffer_put_string(&m, sig, siglen); + buffer_put_string(&m, data, datalen); + xfree(blob); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); + + debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); + + verified = buffer_get_int(&m); + + buffer_free(&m); + + return (verified); +} + +/* Export key state after authentication */ +Newkeys * +mm_newkeys_from_blob(u_char *blob, int blen) +{ + Buffer b; + u_int len; + Newkeys *newkey = NULL; + Enc *enc; + Mac *mac; + Comp *comp; + + debug3("%s: %p(%d)", __func__, blob, blen); +#ifdef DEBUG_PK + dump_base64(stderr, blob, blen); +#endif + buffer_init(&b); + buffer_append(&b, blob, blen); + + newkey = xmalloc(sizeof(*newkey)); + enc = &newkey->enc; + mac = &newkey->mac; + comp = &newkey->comp; + + /* Enc structure */ + enc->name = buffer_get_string(&b, NULL); + buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); + enc->enabled = buffer_get_int(&b); + enc->block_size = buffer_get_int(&b); + enc->key = buffer_get_string(&b, &enc->key_len); + enc->iv = buffer_get_string(&b, &len); + if (len != enc->block_size) + fatal("%s: bad ivlen: expected %u != %u", __func__, + enc->block_size, len); + + if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) + fatal("%s: bad cipher name %s or pointer %p", __func__, + enc->name, enc->cipher); + + /* Mac structure */ + mac->name = buffer_get_string(&b, NULL); + if (mac->name == NULL || mac_setup(mac, mac->name) == -1) + fatal("%s: can not setup mac %s", __func__, mac->name); + mac->enabled = buffer_get_int(&b); + mac->key = buffer_get_string(&b, &len); + if (len > mac->key_len) + fatal("%s: bad mac key length: %u > %d", __func__, len, + mac->key_len); + mac->key_len = len; + + /* Comp structure */ + comp->type = buffer_get_int(&b); + comp->enabled = buffer_get_int(&b); + comp->name = buffer_get_string(&b, NULL); + + len = buffer_len(&b); + if (len != 0) + error("newkeys_from_blob: remaining bytes in blob %u", len); + buffer_free(&b); + return (newkey); +} + +int +mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) +{ + Buffer b; + int len; + Enc *enc; + Mac *mac; + Comp *comp; + Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode); + + debug3("%s: converting %p", __func__, newkey); + + if (newkey == NULL) { + error("%s: newkey == NULL", __func__); + return 0; + } + enc = &newkey->enc; + mac = &newkey->mac; + comp = &newkey->comp; + + buffer_init(&b); + /* Enc structure */ + buffer_put_cstring(&b, enc->name); + /* The cipher struct is constant and shared, you export pointer */ + buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); + buffer_put_int(&b, enc->enabled); + buffer_put_int(&b, enc->block_size); + buffer_put_string(&b, enc->key, enc->key_len); + packet_get_keyiv(mode, enc->iv, enc->block_size); + buffer_put_string(&b, enc->iv, enc->block_size); + + /* Mac structure */ + buffer_put_cstring(&b, mac->name); + buffer_put_int(&b, mac->enabled); + buffer_put_string(&b, mac->key, mac->key_len); + + /* Comp structure */ + buffer_put_int(&b, comp->type); + buffer_put_int(&b, comp->enabled); + buffer_put_cstring(&b, comp->name); + + len = buffer_len(&b); + if (lenp != NULL) + *lenp = len; + if (blobp != NULL) { + *blobp = xmalloc(len); + memcpy(*blobp, buffer_ptr(&b), len); + } + memset(buffer_ptr(&b), 0, len); + buffer_free(&b); + return len; +} + +static void +mm_send_kex(Buffer *m, Kex *kex) +{ + buffer_put_string(m, kex->session_id, kex->session_id_len); + buffer_put_int(m, kex->we_need); + buffer_put_int(m, kex->hostkey_type); + buffer_put_int(m, kex->kex_type); + buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); + buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); + buffer_put_int(m, kex->flags); + buffer_put_cstring(m, kex->client_version_string); + buffer_put_cstring(m, kex->server_version_string); +} + +void +mm_send_keystate(struct monitor *monitor) +{ + Buffer m, *input, *output; + u_char *blob, *p; + u_int bloblen, plen; + u_int32_t seqnr, packets; + u_int64_t blocks, bytes; + + buffer_init(&m); + + if (!compat20) { + u_char iv[24]; + u_char *key; + u_int ivlen, keylen; + + buffer_put_int(&m, packet_get_protocol_flags()); + + buffer_put_int(&m, packet_get_ssh1_cipher()); + + debug3("%s: Sending ssh1 KEY+IV", __func__); + keylen = packet_get_encryption_key(NULL); + key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ + keylen = packet_get_encryption_key(key); + buffer_put_string(&m, key, keylen); + memset(key, 0, keylen); + xfree(key); + + ivlen = packet_get_keyiv_len(MODE_OUT); + packet_get_keyiv(MODE_OUT, iv, ivlen); + buffer_put_string(&m, iv, ivlen); + ivlen = packet_get_keyiv_len(MODE_OUT); + packet_get_keyiv(MODE_IN, iv, ivlen); + buffer_put_string(&m, iv, ivlen); + goto skip; + } else { + /* Kex for rekeying */ + mm_send_kex(&m, *monitor->m_pkex); + } + + debug3("%s: Sending new keys: %p %p", + __func__, packet_get_newkeys(MODE_OUT), + packet_get_newkeys(MODE_IN)); + + /* Keys from Kex */ + if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) + fatal("%s: conversion of newkeys failed", __func__); + + buffer_put_string(&m, blob, bloblen); + xfree(blob); + + if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) + fatal("%s: conversion of newkeys failed", __func__); + + buffer_put_string(&m, blob, bloblen); + xfree(blob); + + packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); + buffer_put_int(&m, seqnr); + buffer_put_int64(&m, blocks); + buffer_put_int(&m, packets); + buffer_put_int64(&m, bytes); + packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); + buffer_put_int(&m, seqnr); + buffer_put_int64(&m, blocks); + buffer_put_int(&m, packets); + buffer_put_int64(&m, bytes); + + debug3("%s: New keys have been sent", __func__); + skip: + /* More key context */ + plen = packet_get_keycontext(MODE_OUT, NULL); + p = xmalloc(plen+1); + packet_get_keycontext(MODE_OUT, p); + buffer_put_string(&m, p, plen); + xfree(p); + + plen = packet_get_keycontext(MODE_IN, NULL); + p = xmalloc(plen+1); + packet_get_keycontext(MODE_IN, p); + buffer_put_string(&m, p, plen); + xfree(p); + + /* Compression state */ + debug3("%s: Sending compression state", __func__); + buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); + buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); + + /* Network I/O buffers */ + input = (Buffer *)packet_get_input(); + output = (Buffer *)packet_get_output(); + buffer_put_string(&m, buffer_ptr(input), buffer_len(input)); + buffer_put_string(&m, buffer_ptr(output), buffer_len(output)); + + /* Roaming */ + if (compat20) { + buffer_put_int64(&m, get_sent_bytes()); + buffer_put_int64(&m, get_recv_bytes()); + } + + mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); + debug3("%s: Finished sending state", __func__); + + buffer_free(&m); +} + +int +mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) +{ + Buffer m; + char *p, *msg; + int success = 0, tmp1 = -1, tmp2 = -1; + + /* Kludge: ensure there are fds free to receive the pty/tty */ + if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || + (tmp2 = dup(pmonitor->m_recvfd)) == -1) { + error("%s: cannot allocate fds for pty", __func__); + if (tmp1 > 0) + close(tmp1); + if (tmp2 > 0) + close(tmp2); + return 0; + } + close(tmp1); + close(tmp2); + + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); + + debug3("%s: waiting for MONITOR_ANS_PTY", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); + + success = buffer_get_int(&m); + if (success == 0) { + debug3("%s: pty alloc failed", __func__); + buffer_free(&m); + return (0); + } + p = buffer_get_string(&m, NULL); + msg = buffer_get_string(&m, NULL); + buffer_free(&m); + + strlcpy(namebuf, p, namebuflen); /* Possible truncation */ + xfree(p); + + buffer_append(&loginmsg, msg, strlen(msg)); + xfree(msg); + + if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || + (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) + fatal("%s: receive fds failed", __func__); + + /* Success */ + return (1); +} + +void +mm_session_pty_cleanup2(Session *s) +{ + Buffer m; + + if (s->ttyfd == -1) + return; + buffer_init(&m); + buffer_put_cstring(&m, s->tty); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); + buffer_free(&m); + + /* closed dup'ed master */ + if (s->ptymaster != -1 && close(s->ptymaster) < 0) + error("close(s->ptymaster/%d): %s", + s->ptymaster, strerror(errno)); + + /* unlink pty from session */ + s->ttyfd = -1; +} + +#ifdef USE_PAM +void +mm_start_pam(Authctxt *authctxt) +{ + Buffer m; + + debug3("%s entering", __func__); + if (!options.use_pam) + fatal("UsePAM=no, but ended up in %s anyway", __func__); + + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); + + buffer_free(&m); +} + +u_int +mm_do_pam_account(void) +{ + Buffer m; + u_int ret; + char *msg; + + debug3("%s entering", __func__); + if (!options.use_pam) + fatal("UsePAM=no, but ended up in %s anyway", __func__); + + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); + + mm_request_receive_expect(pmonitor->m_recvfd, + MONITOR_ANS_PAM_ACCOUNT, &m); + ret = buffer_get_int(&m); + msg = buffer_get_string(&m, NULL); + buffer_append(&loginmsg, msg, strlen(msg)); + xfree(msg); + + buffer_free(&m); + + debug3("%s returning %d", __func__, ret); + + return (ret); +} + +void * +mm_sshpam_init_ctx(Authctxt *authctxt) +{ + Buffer m; + int success; + + debug3("%s", __func__); + buffer_init(&m); + buffer_put_cstring(&m, authctxt->user); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); + debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); + success = buffer_get_int(&m); + if (success == 0) { + debug3("%s: pam_init_ctx failed", __func__); + buffer_free(&m); + return (NULL); + } + buffer_free(&m); + return (authctxt); +} + +int +mm_sshpam_query(void *ctx, char **name, char **info, + u_int *num, char ***prompts, u_int **echo_on) +{ + Buffer m; + u_int i; + int ret; + + debug3("%s", __func__); + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); + debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); + ret = buffer_get_int(&m); + debug3("%s: pam_query returned %d", __func__, ret); + *name = buffer_get_string(&m, NULL); + *info = buffer_get_string(&m, NULL); + *num = buffer_get_int(&m); + if (*num > PAM_MAX_NUM_MSG) + fatal("%s: recieved %u PAM messages, expected <= %u", + __func__, *num, PAM_MAX_NUM_MSG); + *prompts = xcalloc((*num + 1), sizeof(char *)); + *echo_on = xcalloc((*num + 1), sizeof(u_int)); + for (i = 0; i < *num; ++i) { + (*prompts)[i] = buffer_get_string(&m, NULL); + (*echo_on)[i] = buffer_get_int(&m); + } + buffer_free(&m); + return (ret); +} + +int +mm_sshpam_respond(void *ctx, u_int num, char **resp) +{ + Buffer m; + u_int i; + int ret; + + debug3("%s", __func__); + buffer_init(&m); + buffer_put_int(&m, num); + for (i = 0; i < num; ++i) + buffer_put_cstring(&m, resp[i]); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); + debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); + ret = buffer_get_int(&m); + debug3("%s: pam_respond returned %d", __func__, ret); + buffer_free(&m); + return (ret); +} + +void +mm_sshpam_free_ctx(void *ctxtp) +{ + Buffer m; + + debug3("%s", __func__); + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); + debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); + buffer_free(&m); +} +#endif /* USE_PAM */ + +/* Request process termination */ + +void +mm_terminate(void) +{ + Buffer m; + + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); + buffer_free(&m); +} + +int +mm_ssh1_session_key(BIGNUM *num) +{ + int rsafail; + Buffer m; + + buffer_init(&m); + buffer_put_bignum2(&m, num); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); + + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); + + rsafail = buffer_get_int(&m); + buffer_get_bignum2(&m, num); + + buffer_free(&m); + + return (rsafail); +} + +static void +mm_chall_setup(char **name, char **infotxt, u_int *numprompts, + char ***prompts, u_int **echo_on) +{ + *name = xstrdup(""); + *infotxt = xstrdup(""); + *numprompts = 1; + *prompts = xcalloc(*numprompts, sizeof(char *)); + *echo_on = xcalloc(*numprompts, sizeof(u_int)); + (*echo_on)[0] = 0; +} + +int +mm_bsdauth_query(void *ctx, char **name, char **infotxt, + u_int *numprompts, char ***prompts, u_int **echo_on) +{ + Buffer m; + u_int success; + char *challenge; + + debug3("%s: entering", __func__); + + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); + + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, + &m); + success = buffer_get_int(&m); + if (success == 0) { + debug3("%s: no challenge", __func__); + buffer_free(&m); + return (-1); + } + + /* Get the challenge, and format the response */ + challenge = buffer_get_string(&m, NULL); + buffer_free(&m); + + mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); + (*prompts)[0] = challenge; + + debug3("%s: received challenge: %s", __func__, challenge); + + return (0); +} + +int +mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) +{ + Buffer m; + int authok; + + debug3("%s: entering", __func__); + if (numresponses != 1) + return (-1); + + buffer_init(&m); + buffer_put_cstring(&m, responses[0]); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); + + mm_request_receive_expect(pmonitor->m_recvfd, + MONITOR_ANS_BSDAUTHRESPOND, &m); + + authok = buffer_get_int(&m); + buffer_free(&m); + + return ((authok == 0) ? -1 : 0); +} + +#ifdef SKEY +int +mm_skey_query(void *ctx, char **name, char **infotxt, + u_int *numprompts, char ***prompts, u_int **echo_on) +{ + Buffer m; + u_int success; + char *challenge; + + debug3("%s: entering", __func__); + + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); + + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, + &m); + success = buffer_get_int(&m); + if (success == 0) { + debug3("%s: no challenge", __func__); + buffer_free(&m); + return (-1); + } + + /* Get the challenge, and format the response */ + challenge = buffer_get_string(&m, NULL); + buffer_free(&m); + + debug3("%s: received challenge: %s", __func__, challenge); + + mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); + + xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); + xfree(challenge); + + return (0); +} + +int +mm_skey_respond(void *ctx, u_int numresponses, char **responses) +{ + Buffer m; + int authok; + + debug3("%s: entering", __func__); + if (numresponses != 1) + return (-1); + + buffer_init(&m); + buffer_put_cstring(&m, responses[0]); + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); + + mm_request_receive_expect(pmonitor->m_recvfd, + MONITOR_ANS_SKEYRESPOND, &m); + + authok = buffer_get_int(&m); + buffer_free(&m); + + return ((authok == 0) ? -1 : 0); +} +#endif /* SKEY */ + +void +mm_ssh1_session_id(u_char session_id[16]) +{ + Buffer m; + int i; + + debug3("%s entering", __func__); + + buffer_init(&m); + for (i = 0; i < 16; i++) + buffer_put_char(&m, session_id[i]); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); + buffer_free(&m); +} + +int +mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) +{ + Buffer m; + Key *key; + u_char *blob; + u_int blen; + int allowed = 0, have_forced = 0; + + debug3("%s entering", __func__); + + buffer_init(&m); + buffer_put_bignum2(&m, client_n); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); + + allowed = buffer_get_int(&m); + + /* fake forced command */ + auth_clear_options(); + have_forced = buffer_get_int(&m); + forced_command = have_forced ? xstrdup("true") : NULL; + + if (allowed && rkey != NULL) { + blob = buffer_get_string(&m, &blen); + if ((key = key_from_blob(blob, blen)) == NULL) + fatal("%s: key_from_blob failed", __func__); + *rkey = key; + xfree(blob); + } + buffer_free(&m); + + return (allowed); +} + +BIGNUM * +mm_auth_rsa_generate_challenge(Key *key) +{ + Buffer m; + BIGNUM *challenge; + u_char *blob; + u_int blen; + + debug3("%s entering", __func__); + + if ((challenge = BN_new()) == NULL) + fatal("%s: BN_new failed", __func__); + + key->type = KEY_RSA; /* XXX cheat for key_to_blob */ + if (key_to_blob(key, &blob, &blen) == 0) + fatal("%s: key_to_blob failed", __func__); + key->type = KEY_RSA1; + + buffer_init(&m); + buffer_put_string(&m, blob, blen); + xfree(blob); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); + + buffer_get_bignum2(&m, challenge); + buffer_free(&m); + + return (challenge); +} + +int +mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) +{ + Buffer m; + u_char *blob; + u_int blen; + int success = 0; + + debug3("%s entering", __func__); + + key->type = KEY_RSA; /* XXX cheat for key_to_blob */ + if (key_to_blob(key, &blob, &blen) == 0) + fatal("%s: key_to_blob failed", __func__); + key->type = KEY_RSA1; + + buffer_init(&m); + buffer_put_string(&m, blob, blen); + buffer_put_string(&m, response, 16); + xfree(blob); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); + + success = buffer_get_int(&m); + buffer_free(&m); + + return (success); +} + +#ifdef SSH_AUDIT_EVENTS +void +mm_audit_event(ssh_audit_event_t event) +{ + Buffer m; + + debug3("%s entering", __func__); + + buffer_init(&m); + buffer_put_int(&m, event); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); + buffer_free(&m); +} + +void +mm_audit_run_command(const char *command) +{ + Buffer m; + + debug3("%s entering command %s", __func__, command); + + buffer_init(&m); + buffer_put_cstring(&m, command); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); + buffer_free(&m); +} +#endif /* SSH_AUDIT_EVENTS */ + +#ifdef GSSAPI +OM_uint32 +mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) +{ + Buffer m; + OM_uint32 major; + + /* Client doesn't get to see the context */ + *ctx = NULL; + + buffer_init(&m); + buffer_put_string(&m, goid->elements, goid->length); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); + + major = buffer_get_int(&m); + + buffer_free(&m); + return (major); +} + +OM_uint32 +mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, + gss_buffer_desc *out, OM_uint32 *flags) +{ + Buffer m; + OM_uint32 major; + u_int len; + + buffer_init(&m); + buffer_put_string(&m, in->value, in->length); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); + + major = buffer_get_int(&m); + out->value = buffer_get_string(&m, &len); + out->length = len; + if (flags) + *flags = buffer_get_int(&m); + + buffer_free(&m); + + return (major); +} + +OM_uint32 +mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) +{ + Buffer m; + OM_uint32 major; + + buffer_init(&m); + buffer_put_string(&m, gssbuf->value, gssbuf->length); + buffer_put_string(&m, gssmic->value, gssmic->length); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, + &m); + + major = buffer_get_int(&m); + buffer_free(&m); + return(major); +} + +int +mm_ssh_gssapi_userok(char *user, struct passwd *pw) +{ + Buffer m; + int authenticated = 0; + + buffer_init(&m); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, + &m); + + authenticated = buffer_get_int(&m); + + buffer_free(&m); + debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); + return (authenticated); +} + +OM_uint32 +mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash) +{ + Buffer m; + OM_uint32 major; + u_int len; + + buffer_init(&m); + buffer_put_string(&m, data->value, data->length); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, &m); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, &m); + + major = buffer_get_int(&m); + hash->value = buffer_get_string(&m, &len); + hash->length = len; + + buffer_free(&m); + + return(major); +} + +int +mm_ssh_gssapi_update_creds(ssh_gssapi_ccache *store) +{ + Buffer m; + int ok; + + buffer_init(&m); + + buffer_put_cstring(&m, store->filename ? store->filename : ""); + buffer_put_cstring(&m, store->envvar ? store->envvar : ""); + buffer_put_cstring(&m, store->envval ? store->envval : ""); + + mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUPCREDS, &m); + mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUPCREDS, &m); + + ok = buffer_get_int(&m); + + buffer_free(&m); + + return (ok); +} + +#endif /* GSSAPI */ + +#ifdef JPAKE +void +mm_auth2_jpake_get_pwdata(Authctxt *authctxt, BIGNUM **s, + char **hash_scheme, char **salt) +{ + Buffer m; + + debug3("%s entering", __func__); + + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, + MONITOR_REQ_JPAKE_GET_PWDATA, &m); + + debug3("%s: waiting for MONITOR_ANS_JPAKE_GET_PWDATA", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, + MONITOR_ANS_JPAKE_GET_PWDATA, &m); + + *hash_scheme = buffer_get_string(&m, NULL); + *salt = buffer_get_string(&m, NULL); + + buffer_free(&m); +} + +void +mm_jpake_step1(struct modp_group *grp, + u_char **id, u_int *id_len, + BIGNUM **priv1, BIGNUM **priv2, BIGNUM **g_priv1, BIGNUM **g_priv2, + u_char **priv1_proof, u_int *priv1_proof_len, + u_char **priv2_proof, u_int *priv2_proof_len) +{ + Buffer m; + + debug3("%s entering", __func__); + + buffer_init(&m); + mm_request_send(pmonitor->m_recvfd, + MONITOR_REQ_JPAKE_STEP1, &m); + + debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP1", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, + MONITOR_ANS_JPAKE_STEP1, &m); + + if ((*priv1 = BN_new()) == NULL || + (*priv2 = BN_new()) == NULL || + (*g_priv1 = BN_new()) == NULL || + (*g_priv2 = BN_new()) == NULL) + fatal("%s: BN_new", __func__); + + *id = buffer_get_string(&m, id_len); + /* priv1 and priv2 are, well, private */ + buffer_get_bignum2(&m, *g_priv1); + buffer_get_bignum2(&m, *g_priv2); + *priv1_proof = buffer_get_string(&m, priv1_proof_len); + *priv2_proof = buffer_get_string(&m, priv2_proof_len); + + buffer_free(&m); +} + +void +mm_jpake_step2(struct modp_group *grp, BIGNUM *s, + BIGNUM *mypub1, BIGNUM *theirpub1, BIGNUM *theirpub2, BIGNUM *mypriv2, + const u_char *theirid, u_int theirid_len, + const u_char *myid, u_int myid_len, + const u_char *theirpub1_proof, u_int theirpub1_proof_len, + const u_char *theirpub2_proof, u_int theirpub2_proof_len, + BIGNUM **newpub, + u_char **newpub_exponent_proof, u_int *newpub_exponent_proof_len) +{ + Buffer m; + + debug3("%s entering", __func__); + + buffer_init(&m); + /* monitor already has all bignums except theirpub1, theirpub2 */ + buffer_put_bignum2(&m, theirpub1); + buffer_put_bignum2(&m, theirpub2); + /* monitor already knows our id */ + buffer_put_string(&m, theirid, theirid_len); + buffer_put_string(&m, theirpub1_proof, theirpub1_proof_len); + buffer_put_string(&m, theirpub2_proof, theirpub2_proof_len); + + mm_request_send(pmonitor->m_recvfd, + MONITOR_REQ_JPAKE_STEP2, &m); + + debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP2", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, + MONITOR_ANS_JPAKE_STEP2, &m); + + if ((*newpub = BN_new()) == NULL) + fatal("%s: BN_new", __func__); + + buffer_get_bignum2(&m, *newpub); + *newpub_exponent_proof = buffer_get_string(&m, + newpub_exponent_proof_len); + + buffer_free(&m); +} + +void +mm_jpake_key_confirm(struct modp_group *grp, BIGNUM *s, BIGNUM *step2_val, + BIGNUM *mypriv2, BIGNUM *mypub1, BIGNUM *mypub2, + BIGNUM *theirpub1, BIGNUM *theirpub2, + const u_char *my_id, u_int my_id_len, + const u_char *their_id, u_int their_id_len, + const u_char *sess_id, u_int sess_id_len, + const u_char *theirpriv2_s_proof, u_int theirpriv2_s_proof_len, + BIGNUM **k, + u_char **confirm_hash, u_int *confirm_hash_len) +{ + Buffer m; + + debug3("%s entering", __func__); + + buffer_init(&m); + /* monitor already has all bignums except step2_val */ + buffer_put_bignum2(&m, step2_val); + /* monitor already knows all the ids */ + buffer_put_string(&m, theirpriv2_s_proof, theirpriv2_s_proof_len); + + mm_request_send(pmonitor->m_recvfd, + MONITOR_REQ_JPAKE_KEY_CONFIRM, &m); + + debug3("%s: waiting for MONITOR_ANS_JPAKE_KEY_CONFIRM", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, + MONITOR_ANS_JPAKE_KEY_CONFIRM, &m); + + /* 'k' is sensitive and stays in the monitor */ + *confirm_hash = buffer_get_string(&m, confirm_hash_len); + + buffer_free(&m); +} + +int +mm_jpake_check_confirm(const BIGNUM *k, + const u_char *peer_id, u_int peer_id_len, + const u_char *sess_id, u_int sess_id_len, + const u_char *peer_confirm_hash, u_int peer_confirm_hash_len) +{ + Buffer m; + int success = 0; + + debug3("%s entering", __func__); + + buffer_init(&m); + /* k is dummy in slave, ignored */ + /* monitor knows all the ids */ + buffer_put_string(&m, peer_confirm_hash, peer_confirm_hash_len); + mm_request_send(pmonitor->m_recvfd, + MONITOR_REQ_JPAKE_CHECK_CONFIRM, &m); + + debug3("%s: waiting for MONITOR_ANS_JPAKE_CHECK_CONFIRM", __func__); + mm_request_receive_expect(pmonitor->m_recvfd, + MONITOR_ANS_JPAKE_CHECK_CONFIRM, &m); + + success = buffer_get_int(&m); + buffer_free(&m); + + debug3("%s: success = %d", __func__, success); + return success; +} +#endif /* JPAKE */