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/* $OpenBSD: monitor_wrap.c,v 1.107 2018/07/20 03:46:34 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, 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_sshkey_sign(struct sshkey *key, u_char **sigp, size_t *lenp,
const u_char *data, size_t datalen, const char *hostkey_alg, u_int compat)
{
struct kex *kex = *pmonitor->m_pkex;
struct sshbuf *m;
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 ||
(r = sshbuf_put_u32(m, compat)) != 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, lenp)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
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, style, and role */
void
mm_inform_authserv(char *service, char *style, char *role)
{
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 ||
(r = sshbuf_put_cstring(m, role ? role : "")) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
sshbuf_free(m);
}
/* Inform the privileged process about role */
void
mm_inform_authrole(char *role)
{
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, role ? role : "")) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHROLE, 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("%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));
if (maxtries > INT_MAX)
fatal("%s: bad maxtries %u", __func__, maxtries);
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)
{
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("%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 SSH_AUDIT_EVENTS
void
mm_audit_event(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("%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 = ssh_gssapi_get_buffer_desc(m, out)) != 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 passwd *pw)
{
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);
}
OM_uint32
mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash)
{
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, data->value, data->length)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, m);
mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, m);
if ((r = sshbuf_get_u32(m, &major)) != 0 ||
(r = ssh_gssapi_get_buffer_desc(m, hash)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
sshbuf_free(m);
return(major);
}
int
mm_ssh_gssapi_update_creds(ssh_gssapi_ccache *store)
{
struct sshbuf *m;
int r, ok;
if ((m = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
if ((r = sshbuf_put_cstring(m,
store->filename ? store->filename : "")) != 0 ||
(r = sshbuf_put_cstring(m,
store->envvar ? store->envvar : "")) != 0 ||
(r = sshbuf_put_cstring(m,
store->envval ? store->envval : "")) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUPCREDS, m);
mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUPCREDS, m);
if ((r = sshbuf_get_u32(m, &ok)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
sshbuf_free(m);
return (ok);
}
#endif /* GSSAPI */
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