| /* $OpenBSD: monitor_wrap.c,v 1.103 2018/07/09 21:53:45 markus Exp $ */ |
| /* |
| * Copyright 2002 Niels Provos <provos@citi.umich.edu> |
| * Copyright 2002 Markus Friedl <markus@openbsd.org> |
| * 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 <sys/types.h> |
| #include <sys/uio.h> |
| |
| #include <errno.h> |
| #include <pwd.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #ifdef WITH_OPENSSL |
| #include <openssl/bn.h> |
| #include <openssl/dh.h> |
| #include <openssl/evp.h> |
| #endif |
| |
| #include "openbsd-compat/sys-queue.h" |
| #include "xmalloc.h" |
| #include "ssh.h" |
| #ifdef WITH_OPENSSL |
| #include "dh.h" |
| #endif |
| #include "sshbuf.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" |
| #include "auth-pam.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 "channels.h" |
| #include "session.h" |
| #include "servconf.h" |
| |
| #include "ssherr.h" |
| |
| /* Imports */ |
| extern z_stream incoming_stream; |
| extern z_stream outgoing_stream; |
| extern struct monitor *pmonitor; |
| extern struct sshbuf *loginmsg; |
| extern ServerOptions options; |
| |
| void |
| mm_log_handler(LogLevel level, const char *msg, void *ctx) |
| { |
| struct sshbuf *log_msg; |
| struct monitor *mon = (struct monitor *)ctx; |
| int r; |
| size_t len; |
| |
| if (mon->m_log_sendfd == -1) |
| fatal("%s: no log channel", __func__); |
| |
| if ((log_msg = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| |
| if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */ |
| (r = sshbuf_put_u32(log_msg, level)) != 0 || |
| (r = sshbuf_put_cstring(log_msg, msg)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff) |
| fatal("%s: bad length %zu", __func__, len); |
| POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4); |
| if (atomicio(vwrite, mon->m_log_sendfd, |
| sshbuf_mutable_ptr(log_msg), len) != len) |
| fatal("%s: write: %s", __func__, strerror(errno)); |
| sshbuf_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, struct sshbuf *m) |
| { |
| size_t mlen = sshbuf_len(m); |
| u_char buf[5]; |
| |
| debug3("%s entering: type %d", __func__, type); |
| |
| if (mlen >= 0xffffffff) |
| fatal("%s: bad length %zu", __func__, mlen); |
| POKE_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, sshbuf_mutable_ptr(m), mlen) != mlen) |
| fatal("%s: write: %s", __func__, strerror(errno)); |
| } |
| |
| void |
| mm_request_receive(int sock, struct sshbuf *m) |
| { |
| u_char buf[4], *p = NULL; |
| u_int msg_len; |
| int r; |
| |
| 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 = PEEK_U32(buf); |
| if (msg_len > 256 * 1024) |
| fatal("%s: read: bad msg_len %d", __func__, msg_len); |
| sshbuf_reset(m); |
| if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (atomicio(read, sock, p, msg_len) != msg_len) |
| fatal("%s: read: %s", __func__, strerror(errno)); |
| } |
| |
| void |
| mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m) |
| { |
| u_char rtype; |
| int r; |
| |
| debug3("%s entering: type %d", __func__, type); |
| |
| mm_request_receive(sock, m); |
| if ((r = sshbuf_get_u8(m, &rtype)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (rtype != type) |
| fatal("%s: read: rtype %d != type %d", __func__, |
| rtype, type); |
| } |
| |
| #ifdef WITH_OPENSSL |
| DH * |
| mm_choose_dh(int min, int nbits, int max) |
| { |
| BIGNUM *p, *g; |
| int r; |
| u_char success = 0; |
| struct sshbuf *m; |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_u32(m, min)) != 0 || |
| (r = sshbuf_put_u32(m, nbits)) != 0 || |
| (r = sshbuf_put_u32(m, max)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| 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); |
| |
| if ((r = sshbuf_get_u8(m, &success)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 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__); |
| if ((r = sshbuf_get_bignum2(m, p)) != 0 || |
| (r = sshbuf_get_bignum2(m, g)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| debug3("%s: remaining %zu", __func__, sshbuf_len(m)); |
| sshbuf_free(m); |
| |
| return (dh_new_group(g, p)); |
| } |
| #endif |
| |
| int |
| mm_key_sign(struct sshkey *key, u_char **sigp, u_int *lenp, |
| const u_char *data, u_int datalen, const char *hostkey_alg) |
| { |
| struct kex *kex = *pmonitor->m_pkex; |
| struct sshbuf *m; |
| size_t xxxlen; |
| u_int ndx = kex->host_key_index(key, 0, active_state); |
| int r; |
| |
| debug3("%s entering", __func__); |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_u32(m, ndx)) != 0 || |
| (r = sshbuf_put_string(m, data, datalen)) != 0 || |
| (r = sshbuf_put_cstring(m, hostkey_alg)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| 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); |
| if ((r = sshbuf_get_string(m, sigp, &xxxlen)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (xxxlen > 0xffffffff) |
| fatal("%s: bad length %zu", __func__, xxxlen); |
| *lenp = xxxlen; /* XXX fix API: size_t vs u_int */ |
| sshbuf_free(m); |
| |
| return (0); |
| } |
| |
| struct passwd * |
| mm_getpwnamallow(const char *username) |
| { |
| struct ssh *ssh = active_state; /* XXX */ |
| struct sshbuf *m; |
| struct passwd *pw; |
| size_t len; |
| u_int i; |
| ServerOptions *newopts; |
| int r; |
| u_char ok; |
| const u_char *p; |
| |
| debug3("%s entering", __func__); |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_cstring(m, username)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| 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 ((r = sshbuf_get_u8(m, &ok)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (ok == 0) { |
| pw = NULL; |
| goto out; |
| } |
| |
| /* XXX don't like passing struct passwd like this */ |
| pw = xcalloc(sizeof(*pw), 1); |
| if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (len != sizeof(*pw)) |
| fatal("%s: struct passwd size mismatch", __func__); |
| memcpy(pw, p, sizeof(*pw)); |
| |
| if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 || |
| (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 || |
| #ifdef HAVE_STRUCT_PASSWD_PW_GECOS |
| (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 || |
| #endif |
| #ifdef HAVE_STRUCT_PASSWD_PW_CLASS |
| (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 || |
| #endif |
| (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 || |
| (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| out: |
| /* copy options block as a Match directive may have changed some */ |
| if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (len != sizeof(*newopts)) |
| fatal("%s: option block size mismatch", __func__); |
| newopts = xcalloc(sizeof(*newopts), 1); |
| memcpy(newopts, p, sizeof(*newopts)); |
| |
| #define M_CP_STROPT(x) do { \ |
| if (newopts->x != NULL) { \ |
| if ((r = sshbuf_get_cstring(m, \ |
| &newopts->x, NULL)) != 0) \ |
| fatal("%s: buffer error: %s", \ |
| __func__, ssh_err(r)); \ |
| } \ |
| } while (0) |
| #define M_CP_STRARRAYOPT(x, nx) do { \ |
| newopts->x = newopts->nx == 0 ? \ |
| NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \ |
| for (i = 0; i < newopts->nx; i++) { \ |
| if ((r = sshbuf_get_cstring(m, \ |
| &newopts->x[i], NULL)) != 0) \ |
| fatal("%s: buffer error: %s", \ |
| __func__, ssh_err(r)); \ |
| } \ |
| } 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); |
| log_change_level(options.log_level); |
| process_permitopen(ssh, &options); |
| free(newopts); |
| |
| sshbuf_free(m); |
| |
| return (pw); |
| } |
| |
| char * |
| mm_auth2_read_banner(void) |
| { |
| struct sshbuf *m; |
| char *banner; |
| int r; |
| |
| debug3("%s entering", __func__); |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m); |
| sshbuf_reset(m); |
| |
| mm_request_receive_expect(pmonitor->m_recvfd, |
| MONITOR_ANS_AUTH2_READ_BANNER, m); |
| if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| sshbuf_free(m); |
| |
| /* treat empty banner as missing banner */ |
| if (strlen(banner) == 0) { |
| free(banner); |
| banner = NULL; |
| } |
| return (banner); |
| } |
| |
| /* Inform the privileged process about service and style */ |
| |
| void |
| mm_inform_authserv(char *service, char *style) |
| { |
| struct sshbuf *m; |
| int r; |
| |
| debug3("%s entering", __func__); |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_cstring(m, service)) != 0 || |
| (r = sshbuf_put_cstring(m, style ? style : "")) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m); |
| |
| sshbuf_free(m); |
| } |
| |
| /* Do the password authentication */ |
| int |
| mm_auth_password(struct ssh *ssh, char *password) |
| { |
| struct sshbuf *m; |
| int r, maxtries = 0, authenticated = 0; |
| |
| debug3("%s entering", __func__); |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_cstring(m, password)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| 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); |
| |
| if ((r = sshbuf_get_u32(m, &authenticated)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| #ifdef USE_PAM |
| if ((r = sshbuf_get_u32(m, &maxtries)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| sshpam_set_maxtries_reached(maxtries); |
| #endif |
| |
| sshbuf_free(m); |
| |
| debug3("%s: user %sauthenticated", |
| __func__, authenticated ? "" : "not "); |
| return (authenticated); |
| } |
| |
| int |
| mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key, |
| int pubkey_auth_attempt, struct sshauthopt **authoptp) |
| { |
| return (mm_key_allowed(MM_USERKEY, NULL, NULL, key, |
| pubkey_auth_attempt, authoptp)); |
| } |
| |
| int |
| mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host, |
| struct sshkey *key) |
| { |
| return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL)); |
| } |
| |
| int |
| mm_key_allowed(enum mm_keytype type, const char *user, const char *host, |
| struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp) |
| { |
| struct sshbuf *m; |
| int r, allowed = 0; |
| struct sshauthopt *opts = NULL; |
| |
| debug3("%s entering", __func__); |
| |
| if (authoptp != NULL) |
| *authoptp = NULL; |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_u32(m, type)) != 0 || |
| (r = sshbuf_put_cstring(m, user ? user : "")) != 0 || |
| (r = sshbuf_put_cstring(m, host ? host : "")) != 0 || |
| (r = sshkey_puts(key, m)) != 0 || |
| (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| 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); |
| |
| if ((r = sshbuf_get_u32(m, &allowed)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (allowed && type == MM_USERKEY) { |
| if ((r = sshauthopt_deserialise(m, &opts)) != 0) |
| fatal("%s: sshauthopt_deserialise: %s", |
| __func__, ssh_err(r)); |
| } |
| sshbuf_free(m); |
| |
| if (authoptp != NULL) { |
| *authoptp = opts; |
| opts = NULL; |
| } |
| sshauthopt_free(opts); |
| |
| 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_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen, |
| const u_char *data, size_t datalen, const char *sigalg, u_int compat) |
| { |
| struct sshbuf *m; |
| u_int encoded_ret = 0; |
| int r; |
| |
| debug3("%s entering", __func__); |
| |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshkey_puts(key, m)) != 0 || |
| (r = sshbuf_put_string(m, sig, siglen)) != 0 || |
| (r = sshbuf_put_string(m, data, datalen)) != 0 || |
| (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| 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); |
| |
| if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| sshbuf_free(m); |
| |
| if (encoded_ret != 0) |
| return SSH_ERR_SIGNATURE_INVALID; |
| return 0; |
| } |
| |
| void |
| mm_send_keystate(struct monitor *monitor) |
| { |
| struct ssh *ssh = active_state; /* XXX */ |
| struct sshbuf *m; |
| int r; |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = ssh_packet_get_state(ssh, m)) != 0) |
| fatal("%s: get_state failed: %s", |
| __func__, ssh_err(r)); |
| mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m); |
| debug3("%s: Finished sending state", __func__); |
| sshbuf_free(m); |
| } |
| |
| int |
| mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) |
| { |
| struct sshbuf *m; |
| char *p, *msg; |
| int success = 0, tmp1 = -1, tmp2 = -1, r; |
| |
| /* 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); |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| 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); |
| |
| if ((r = sshbuf_get_u32(m, &success)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (success == 0) { |
| debug3("%s: pty alloc failed", __func__); |
| sshbuf_free(m); |
| return (0); |
| } |
| if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 || |
| (r = sshbuf_get_cstring(m, &msg, NULL)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| sshbuf_free(m); |
| |
| strlcpy(namebuf, p, namebuflen); /* Possible truncation */ |
| free(p); |
| |
| if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| free(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) |
| { |
| struct sshbuf *m; |
| int r; |
| |
| if (s->ttyfd == -1) |
| return; |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_cstring(m, s->tty)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m); |
| sshbuf_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)); |
| free(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); |
| 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); |
| sshpam_set_maxtries_reached(buffer_get_int(&m)); |
| *num = buffer_get_int(&m); |
| if (*num > PAM_MAX_NUM_MSG) |
| fatal("%s: received %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) |
| { |
| struct sshbuf *m; |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m); |
| sshbuf_free(m); |
| } |
| |
| 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) |
| { |
| struct sshbuf *m; |
| u_int success; |
| char *challenge; |
| int r; |
| |
| debug3("%s: entering", __func__); |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m); |
| |
| mm_request_receive_expect(pmonitor->m_recvfd, |
| MONITOR_ANS_BSDAUTHQUERY, m); |
| if ((r = sshbuf_get_u32(m, &success)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (success == 0) { |
| debug3("%s: no challenge", __func__); |
| sshbuf_free(m); |
| return (-1); |
| } |
| |
| /* Get the challenge, and format the response */ |
| if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| sshbuf_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) |
| { |
| struct sshbuf *m; |
| int r, authok; |
| |
| debug3("%s: entering", __func__); |
| if (numresponses != 1) |
| return (-1); |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_cstring(m, responses[0])) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m); |
| |
| mm_request_receive_expect(pmonitor->m_recvfd, |
| MONITOR_ANS_BSDAUTHRESPOND, m); |
| |
| if ((r = sshbuf_get_u32(m, &authok)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| sshbuf_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); |
| free(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 */ |
| |
| #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) |
| { |
| struct sshbuf *m; |
| OM_uint32 major; |
| int r; |
| |
| /* Client doesn't get to see the context */ |
| *ctx = NULL; |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m); |
| mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m); |
| |
| if ((r = sshbuf_get_u32(m, &major)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| sshbuf_free(m); |
| return (major); |
| } |
| |
| OM_uint32 |
| mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, |
| gss_buffer_desc *out, OM_uint32 *flagsp) |
| { |
| struct sshbuf *m; |
| OM_uint32 major; |
| u_int flags; |
| int r; |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_string(m, in->value, in->length)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m); |
| mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m); |
| |
| if ((r = sshbuf_get_u32(m, &major)) != 0 || |
| (r = sshbuf_get_string(m, &out->value, &out->length)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| if (flagsp != NULL) { |
| if ((r = sshbuf_get_u32(m, &flags)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| *flagsp = flags; |
| } |
| |
| sshbuf_free(m); |
| |
| return (major); |
| } |
| |
| OM_uint32 |
| mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) |
| { |
| struct sshbuf *m; |
| OM_uint32 major; |
| int r; |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 || |
| (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m); |
| mm_request_receive_expect(pmonitor->m_recvfd, |
| MONITOR_ANS_GSSCHECKMIC, m); |
| |
| if ((r = sshbuf_get_u32(m, &major)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| sshbuf_free(m); |
| return(major); |
| } |
| |
| int |
| mm_ssh_gssapi_userok(char *user) |
| { |
| struct sshbuf *m; |
| int r, authenticated = 0; |
| |
| if ((m = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| |
| mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m); |
| mm_request_receive_expect(pmonitor->m_recvfd, |
| MONITOR_ANS_GSSUSEROK, m); |
| |
| if ((r = sshbuf_get_u32(m, &authenticated)) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| |
| sshbuf_free(m); |
| debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); |
| return (authenticated); |
| } |
| #endif /* GSSAPI */ |