summaryrefslogtreecommitdiffstats
path: root/monitor_wrap.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--monitor_wrap.c1022
1 files changed, 1022 insertions, 0 deletions
diff --git a/monitor_wrap.c b/monitor_wrap.c
new file mode 100644
index 0000000..8e379a1
--- /dev/null
+++ b/monitor_wrap.c
@@ -0,0 +1,1022 @@
+/* $OpenBSD: monitor_wrap.c,v 1.126 2023/01/06 02:47:18 djm 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 "sshkey.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"
+#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 struct monitor *pmonitor;
+extern struct sshbuf *loginmsg;
+extern ServerOptions options;
+
+void
+mm_log_handler(LogLevel level, int forced, 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_f("no log channel");
+
+ if ((log_msg = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+
+ if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */
+ (r = sshbuf_put_u32(log_msg, level)) != 0 ||
+ (r = sshbuf_put_u32(log_msg, forced)) != 0 ||
+ (r = sshbuf_put_cstring(log_msg, msg)) != 0)
+ fatal_fr(r, "assemble");
+ if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
+ fatal_f("bad length %zu", 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_f("write: %s", 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_f("entering, type %d", type);
+
+ if (mlen >= 0xffffffff)
+ fatal_f("bad length %zu", 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_f("write: %s", strerror(errno));
+ if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen)
+ fatal_f("write: %s", strerror(errno));
+}
+
+void
+mm_request_receive(int sock, struct sshbuf *m)
+{
+ u_char buf[4], *p = NULL;
+ u_int msg_len;
+ int r;
+
+ debug3_f("entering");
+
+ if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
+ if (errno == EPIPE)
+ cleanup_exit(255);
+ fatal_f("read: %s", strerror(errno));
+ }
+ msg_len = PEEK_U32(buf);
+ if (msg_len > 256 * 1024)
+ fatal_f("read: bad msg_len %d", msg_len);
+ sshbuf_reset(m);
+ if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
+ fatal_fr(r, "reserve");
+ if (atomicio(read, sock, p, msg_len) != msg_len)
+ fatal_f("read: %s", strerror(errno));
+}
+
+void
+mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
+{
+ u_char rtype;
+ int r;
+
+ debug3_f("entering, type %d", type);
+
+ mm_request_receive(sock, m);
+ if ((r = sshbuf_get_u8(m, &rtype)) != 0)
+ fatal_fr(r, "parse");
+ if (rtype != type)
+ fatal_f("read: rtype %d != type %d", 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_f("sshbuf_new failed");
+ if ((r = sshbuf_put_u32(m, min)) != 0 ||
+ (r = sshbuf_put_u32(m, nbits)) != 0 ||
+ (r = sshbuf_put_u32(m, max)) != 0)
+ fatal_fr(r, "assemble");
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
+
+ debug3_f("waiting for MONITOR_ANS_MODULI");
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m);
+
+ if ((r = sshbuf_get_u8(m, &success)) != 0)
+ fatal_fr(r, "parse success");
+ if (success == 0)
+ fatal_f("MONITOR_ANS_MODULI failed");
+
+ if ((r = sshbuf_get_bignum2(m, &p)) != 0 ||
+ (r = sshbuf_get_bignum2(m, &g)) != 0)
+ fatal_fr(r, "parse group");
+
+ debug3_f("remaining %zu", sshbuf_len(m));
+ sshbuf_free(m);
+
+ return (dh_new_group(g, p));
+}
+#endif
+
+int
+mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
+ const u_char *data, size_t datalen, const char *hostkey_alg,
+ const char *sk_provider, const char *sk_pin, u_int compat)
+{
+ struct kex *kex = *pmonitor->m_pkex;
+ struct sshbuf *m;
+ u_int ndx = kex->host_key_index(key, 0, ssh);
+ int r;
+
+ debug3_f("entering");
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ if ((r = sshbuf_put_u32(m, ndx)) != 0 ||
+ (r = sshbuf_put_string(m, data, datalen)) != 0 ||
+ (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
+ (r = sshbuf_put_u32(m, compat)) != 0)
+ fatal_fr(r, "assemble");
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
+
+ debug3_f("waiting for MONITOR_ANS_SIGN");
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
+ if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
+ fatal_fr(r, "parse");
+ sshbuf_free(m);
+
+ return (0);
+}
+
+#define GETPW(b, id) \
+ do { \
+ if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0) \
+ fatal_fr(r, "parse pw %s", #id); \
+ if (len != sizeof(pw->id)) \
+ fatal_fr(r, "bad length for %s", #id); \
+ memcpy(&pw->id, p, len); \
+ } while (0)
+
+struct passwd *
+mm_getpwnamallow(struct ssh *ssh, const char *username)
+{
+ struct sshbuf *m;
+ struct passwd *pw;
+ size_t len;
+ u_int i;
+ ServerOptions *newopts;
+ int r;
+ u_char ok;
+ const u_char *p;
+
+ debug3_f("entering");
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ if ((r = sshbuf_put_cstring(m, username)) != 0)
+ fatal_fr(r, "assemble");
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
+
+ debug3_f("waiting for MONITOR_ANS_PWNAM");
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
+
+ if ((r = sshbuf_get_u8(m, &ok)) != 0)
+ fatal_fr(r, "parse success");
+ if (ok == 0) {
+ pw = NULL;
+ goto out;
+ }
+
+ /* XXX don't like passing struct passwd like this */
+ pw = xcalloc(sizeof(*pw), 1);
+ GETPW(m, pw_uid);
+ GETPW(m, pw_gid);
+#ifdef HAVE_STRUCT_PASSWD_PW_CHANGE
+ GETPW(m, pw_change);
+#endif
+#ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE
+ GETPW(m, pw_expire);
+#endif
+ 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_fr(r, "parse pw");
+
+out:
+ /* copy options block as a Match directive may have changed some */
+ if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
+ fatal_fr(r, "parse opts");
+ if (len != sizeof(*newopts))
+ fatal_f("option block size mismatch");
+ newopts = xcalloc(sizeof(*newopts), 1);
+ memcpy(newopts, p, sizeof(*newopts));
+
+#define M_CP_STROPT(x) do { \
+ if (newopts->x != NULL && \
+ (r = sshbuf_get_cstring(m, &newopts->x, NULL)) != 0) \
+ fatal_fr(r, "parse %s", #x); \
+ } 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_fr(r, "parse %s", #x); \
+ } \
+ } 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);
+ log_verbose_reset();
+ for (i = 0; i < options.num_log_verbose; i++)
+ log_verbose_add(options.log_verbose[i]);
+ process_permitopen(ssh, &options);
+ process_channel_timeouts(ssh, &options);
+ free(newopts);
+
+ sshbuf_free(m);
+
+ return (pw);
+}
+
+char *
+mm_auth2_read_banner(void)
+{
+ struct sshbuf *m;
+ char *banner;
+ int r;
+
+ debug3_f("entering");
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ 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_fr(r, "parse");
+ 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_f("entering");
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ if ((r = sshbuf_put_cstring(m, service)) != 0 ||
+ (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
+ fatal_fr(r, "assemble");
+
+ 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, authenticated = 0;
+#ifdef USE_PAM
+ u_int maxtries = 0;
+#endif
+
+ debug3_f("entering");
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ if ((r = sshbuf_put_cstring(m, password)) != 0)
+ fatal_fr(r, "assemble");
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
+
+ debug3_f("waiting for MONITOR_ANS_AUTHPASSWORD");
+ mm_request_receive_expect(pmonitor->m_recvfd,
+ MONITOR_ANS_AUTHPASSWORD, m);
+
+ if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
+ fatal_fr(r, "parse");
+#ifdef USE_PAM
+ if ((r = sshbuf_get_u32(m, &maxtries)) != 0)
+ fatal_fr(r, "parse PAM");
+ if (maxtries > INT_MAX)
+ fatal_fr(r, "bad maxtries");
+ sshpam_set_maxtries_reached(maxtries);
+#endif
+
+ sshbuf_free(m);
+
+ debug3_f("user %sauthenticated", 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 ssh *ssh, 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_f("entering");
+
+ if (authoptp != NULL)
+ *authoptp = NULL;
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ 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_fr(r, "assemble");
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
+
+ debug3_f("waiting for MONITOR_ANS_KEYALLOWED");
+ mm_request_receive_expect(pmonitor->m_recvfd,
+ MONITOR_ANS_KEYALLOWED, m);
+
+ if ((r = sshbuf_get_u32(m, &allowed)) != 0)
+ fatal_fr(r, "parse");
+ if (allowed && type == MM_USERKEY &&
+ (r = sshauthopt_deserialise(m, &opts)) != 0)
+ fatal_fr(r, "sshauthopt_deserialise");
+ 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 sshkey_sig_details **sig_detailsp)
+{
+ struct sshbuf *m;
+ u_int encoded_ret = 0;
+ int r;
+ u_char sig_details_present, flags;
+ u_int counter;
+
+ debug3_f("entering");
+
+ if (sig_detailsp != NULL)
+ *sig_detailsp = NULL;
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ 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_fr(r, "assemble");
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
+
+ debug3_f("waiting for MONITOR_ANS_KEYVERIFY");
+ mm_request_receive_expect(pmonitor->m_recvfd,
+ MONITOR_ANS_KEYVERIFY, m);
+
+ if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
+ (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
+ fatal_fr(r, "parse");
+ if (sig_details_present && encoded_ret == 0) {
+ if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
+ (r = sshbuf_get_u8(m, &flags)) != 0)
+ fatal_fr(r, "parse sig_details");
+ if (sig_detailsp != NULL) {
+ *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
+ (*sig_detailsp)->sk_counter = counter;
+ (*sig_detailsp)->sk_flags = flags;
+ }
+ }
+
+ sshbuf_free(m);
+
+ if (encoded_ret != 0)
+ return SSH_ERR_SIGNATURE_INVALID;
+ return 0;
+}
+
+void
+mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
+{
+ struct sshbuf *m;
+ int r;
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ if ((r = ssh_packet_get_state(ssh, m)) != 0)
+ fatal_fr(r, "ssh_packet_get_state");
+ mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
+ debug3_f("Finished sending state");
+ 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_f("cannot allocate fds for pty");
+ if (tmp1 > 0)
+ close(tmp1);
+ if (tmp2 > 0)
+ close(tmp2);
+ return 0;
+ }
+ close(tmp1);
+ close(tmp2);
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
+
+ debug3_f("waiting for MONITOR_ANS_PTY");
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
+
+ if ((r = sshbuf_get_u32(m, &success)) != 0)
+ fatal_fr(r, "parse success");
+ if (success == 0) {
+ debug3_f("pty alloc failed");
+ sshbuf_free(m);
+ return (0);
+ }
+ if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
+ fatal_fr(r, "parse");
+ sshbuf_free(m);
+
+ strlcpy(namebuf, p, namebuflen); /* Possible truncation */
+ free(p);
+
+ if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
+ fatal_fr(r, "put loginmsg");
+ free(msg);
+
+ if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
+ (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
+ fatal_f("receive fds failed");
+
+ /* 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_f("sshbuf_new failed");
+ if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
+ fatal_fr(r, "assmble");
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
+ sshbuf_free(m);
+
+ /* closed dup'ed master */
+ if (s->ptymaster != -1 && close(s->ptymaster) == -1)
+ error("close(s->ptymaster/%d): %s",
+ s->ptymaster, strerror(errno));
+
+ /* unlink pty from session */
+ s->ttyfd = -1;
+}
+
+#ifdef USE_PAM
+void
+mm_start_pam(struct ssh *ssh)
+{
+ struct sshbuf *m;
+
+ debug3("%s entering", __func__);
+ if (!options.use_pam)
+ fatal("UsePAM=no, but ended up in %s anyway", __func__);
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, m);
+
+ sshbuf_free(m);
+}
+
+u_int
+mm_do_pam_account(void)
+{
+ struct sshbuf *m;
+ u_int ret;
+ char *msg;
+ size_t msglen;
+ int r;
+
+ debug3("%s entering", __func__);
+ if (!options.use_pam)
+ fatal("UsePAM=no, but ended up in %s anyway", __func__);
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, m);
+
+ mm_request_receive_expect(pmonitor->m_recvfd,
+ MONITOR_ANS_PAM_ACCOUNT, m);
+ if ((r = sshbuf_get_u32(m, &ret)) != 0 ||
+ (r = sshbuf_get_cstring(m, &msg, &msglen)) != 0 ||
+ (r = sshbuf_put(loginmsg, msg, msglen)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ free(msg);
+ sshbuf_free(m);
+
+ debug3("%s returning %d", __func__, ret);
+
+ return (ret);
+}
+
+void *
+mm_sshpam_init_ctx(Authctxt *authctxt)
+{
+ struct sshbuf *m;
+ int r, success;
+
+ debug3("%s", __func__);
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ 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);
+ if ((r = sshbuf_get_u32(m, &success)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ if (success == 0) {
+ debug3("%s: pam_init_ctx failed", __func__);
+ sshbuf_free(m);
+ return (NULL);
+ }
+ sshbuf_free(m);
+ return (authctxt);
+}
+
+int
+mm_sshpam_query(void *ctx, char **name, char **info,
+ u_int *num, char ***prompts, u_int **echo_on)
+{
+ struct sshbuf *m;
+ u_int i, n;
+ int r, ret;
+
+ debug3("%s", __func__);
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ 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);
+ if ((r = sshbuf_get_u32(m, &ret)) != 0 ||
+ (r = sshbuf_get_cstring(m, name, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(m, info, NULL)) != 0 ||
+ (r = sshbuf_get_u32(m, &n)) != 0 ||
+ (r = sshbuf_get_u32(m, num)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ debug3("%s: pam_query returned %d", __func__, ret);
+ sshpam_set_maxtries_reached(n);
+ 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) {
+ if ((r = sshbuf_get_cstring(m, &((*prompts)[i]), NULL)) != 0 ||
+ (r = sshbuf_get_u32(m, &((*echo_on)[i]))) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ }
+ sshbuf_free(m);
+ return (ret);
+}
+
+int
+mm_sshpam_respond(void *ctx, u_int num, char **resp)
+{
+ struct sshbuf *m;
+ u_int n, i;
+ int r, ret;
+
+ debug3("%s", __func__);
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u32(m, num)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ for (i = 0; i < num; ++i) {
+ if ((r = sshbuf_put_cstring(m, resp[i])) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ }
+ 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);
+ if ((r = sshbuf_get_u32(m, &n)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ ret = (int)n; /* XXX */
+ debug3("%s: pam_respond returned %d", __func__, ret);
+ sshbuf_free(m);
+ return (ret);
+}
+
+void
+mm_sshpam_free_ctx(void *ctxtp)
+{
+ struct sshbuf *m;
+
+ debug3("%s", __func__);
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ 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);
+ sshbuf_free(m);
+}
+#endif /* USE_PAM */
+
+/* Request process termination */
+
+void
+mm_terminate(void)
+{
+ struct sshbuf *m;
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ 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_f("entering");
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ 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_fr(r, "parse success");
+ if (success == 0) {
+ debug3_f("no challenge");
+ sshbuf_free(m);
+ return (-1);
+ }
+
+ /* Get the challenge, and format the response */
+ if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
+ fatal_fr(r, "parse challenge");
+ sshbuf_free(m);
+
+ mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
+ (*prompts)[0] = challenge;
+
+ debug3_f("received challenge: %s", challenge);
+
+ return (0);
+}
+
+int
+mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
+{
+ struct sshbuf *m;
+ int r, authok;
+
+ debug3_f("entering");
+ if (numresponses != 1)
+ return (-1);
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal_f("sshbuf_new failed");
+ if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
+ fatal_fr(r, "assemble");
+ 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_fr(r, "parse");
+ sshbuf_free(m);
+
+ return ((authok == 0) ? -1 : 0);
+}
+
+#ifdef SSH_AUDIT_EVENTS
+void
+mm_audit_event(struct ssh *ssh, ssh_audit_event_t event)
+{
+ struct sshbuf *m;
+ int r;
+
+ debug3("%s entering", __func__);
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u32(m, event)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, m);
+ sshbuf_free(m);
+}
+
+void
+mm_audit_run_command(const char *command)
+{
+ struct sshbuf *m;
+ int r;
+
+ debug3("%s entering command %s", __func__, command);
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_cstring(m, command)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, m);
+ sshbuf_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_f("sshbuf_new failed");
+ if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
+ fatal_fr(r, "assemble");
+
+ 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_fr(r, "parse");
+
+ 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_f("sshbuf_new failed");
+ if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
+ fatal_fr(r, "assemble");
+
+ 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 = ssh_gssapi_get_buffer_desc(m, out)) != 0)
+ fatal_fr(r, "parse");
+ if (flagsp != NULL) {
+ if ((r = sshbuf_get_u32(m, &flags)) != 0)
+ fatal_fr(r, "parse flags");
+ *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_f("sshbuf_new failed");
+ if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
+ (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
+ fatal_fr(r, "assemble");
+
+ 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_fr(r, "parse");
+ 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_f("sshbuf_new failed");
+
+ 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_fr(r, "parse");
+
+ sshbuf_free(m);
+ debug3_f("user %sauthenticated", authenticated ? "" : "not ");
+ return (authenticated);
+}
+#endif /* GSSAPI */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 04:10:56 +0000