*/
#include "includes.h"
-RCSID("$OpenBSD: monitor.c,v 1.21 2002/06/27 10:35:47 deraadt Exp $");
+RCSID("$OpenBSD: monitor.c,v 1.55 2004/02/05 05:37:17 dtucker Exp $");
#include <openssl/dh.h>
#include "auth.h"
#include "kex.h"
#include "dh.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 "packet.h"
#include "auth-options.h"
#include "sshpty.h"
#include "ssh2.h"
#include "mpaux.h"
+#ifdef GSSAPI
+#include "ssh-gss.h"
+static Gssctxt *gsscontext = NULL;
+#endif
+
/* Imports */
extern ServerOptions options;
extern u_int utmp_len;
u_int olen;
} child_state;
-/* Functions on the montior that answer unprivileged requests */
+/* Functions on the monitor that answer unprivileged requests */
int mm_answer_moduli(int, Buffer *);
int mm_answer_sign(int, Buffer *);
#ifdef USE_PAM
int mm_answer_pam_start(int, Buffer *);
+int mm_answer_pam_account(int, Buffer *);
+int mm_answer_pam_init_ctx(int, Buffer *);
+int mm_answer_pam_query(int, Buffer *);
+int mm_answer_pam_respond(int, Buffer *);
+int mm_answer_pam_free_ctx(int, Buffer *);
+#endif
+
+#ifdef GSSAPI
+int mm_answer_gss_setup_ctx(int, Buffer *);
+int mm_answer_gss_accept_ctx(int, Buffer *);
+int mm_answer_gss_userok(int, Buffer *);
+int mm_answer_gss_checkmic(int, Buffer *);
#endif
static Authctxt *authctxt;
static u_char *key_blob = NULL;
static u_int key_bloblen = 0;
static int key_blobtype = MM_NOKEY;
-static u_char *hostbased_cuser = NULL;
-static u_char *hostbased_chost = NULL;
+static char *hostbased_cuser = NULL;
+static char *hostbased_chost = NULL;
static char *auth_method = "unknown";
-static int session_id2_len = 0;
+static u_int session_id2_len = 0;
static u_char *session_id2 = NULL;
+static pid_t monitor_child_pid;
struct mon_table {
enum monitor_reqtype type;
{MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
#ifdef USE_PAM
{MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
+ {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
+ {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
+ {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
+ {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
+ {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
#endif
#ifdef BSD_AUTH
{MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
#endif
{MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
{MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
+#ifdef GSSAPI
+ {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
+ {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
+ {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
+ {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
+#endif
{0, 0, NULL}
};
#endif
#ifdef USE_PAM
{MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
+ {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
+ {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
+ {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
+ {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
+ {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
#endif
{0, 0, NULL}
};
}
}
-Authctxt *
-monitor_child_preauth(struct monitor *pmonitor)
+void
+monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
{
struct mon_table *ent;
int authenticated = 0;
debug3("preauth child monitor started");
+ authctxt = _authctxt;
+ memset(authctxt, 0, sizeof(*authctxt));
+
if (compat20) {
mon_dispatch = mon_dispatch_proto20;
monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
}
- authctxt = authctxt_new();
-
/* The first few requests do not require asynchronous access */
while (!authenticated) {
authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
!auth_root_allowed(auth_method))
authenticated = 0;
#ifdef USE_PAM
- if (!do_pam_account(authctxt->pw->pw_name, NULL))
- authenticated = 0;
+ /* PAM needs to perform account checks after auth */
+ if (options.use_pam && authenticated) {
+ Buffer m;
+
+ buffer_init(&m);
+ mm_request_receive_expect(pmonitor->m_sendfd,
+ MONITOR_REQ_PAM_ACCOUNT, &m);
+ authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
+ buffer_free(&m);
+ }
#endif
}
__func__, authctxt->user);
mm_get_keystate(pmonitor);
+}
+
+static void
+monitor_set_child_handler(pid_t pid)
+{
+ monitor_child_pid = pid;
+}
- return (authctxt);
+static void
+monitor_child_handler(int signal)
+{
+ kill(monitor_child_pid, signal);
}
void
monitor_child_postauth(struct monitor *pmonitor)
{
+ monitor_set_child_handler(pmonitor->m_pid);
+ signal(SIGHUP, &monitor_child_handler);
+ signal(SIGTERM, &monitor_child_handler);
+
if (compat20) {
mon_dispatch = mon_dispatch_postauth20;
monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
-
} else {
mon_dispatch = mon_dispatch_postauth15;
monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
if (pwent == NULL) {
buffer_put_char(m, 0);
+ authctxt->pw = fakepw();
goto out;
}
}
#ifdef USE_PAM
- monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
+ if (options.use_pam)
+ monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
#endif
return (0);
{
static int call_count;
char *passwd;
- int authenticated, plen;
+ int authenticated;
+ u_int plen;
passwd = buffer_get_string(m, &plen);
/* Only authenticate if the context is valid */
authenticated = options.password_authentication &&
- authctxt->valid && auth_password(authctxt, passwd);
+ auth_password(authctxt, passwd);
memset(passwd, 0, strlen(passwd));
xfree(passwd);
u_int numprompts;
u_int *echo_on;
char **prompts;
- int res;
+ u_int success;
- res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
- &prompts, &echo_on);
+ success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
+ &prompts, &echo_on) < 0 ? 0 : 1;
buffer_clear(m);
- buffer_put_int(m, res);
- if (res != -1)
+ buffer_put_int(m, success);
+ if (success)
buffer_put_cstring(m, prompts[0]);
- debug3("%s: sending challenge res: %d", __func__, res);
+ debug3("%s: sending challenge success: %u", __func__, success);
mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
- if (res != -1) {
+ if (success) {
xfree(name);
xfree(infotxt);
xfree(prompts);
{
struct skey skey;
char challenge[1024];
- int res;
+ u_int success;
- res = skeychallenge(&skey, authctxt->user, challenge);
+ success = _compat_skeychallenge(&skey, authctxt->user, challenge,
+ sizeof(challenge)) < 0 ? 0 : 1;
buffer_clear(m);
- buffer_put_int(m, res);
- if (res != -1)
+ buffer_put_int(m, success);
+ if (success)
buffer_put_cstring(m, challenge);
- debug3("%s: sending challenge res: %d", __func__, res);
+ debug3("%s: sending challenge success: %u", __func__, success);
mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
return (0);
int
mm_answer_pam_start(int socket, Buffer *m)
{
- char *user;
-
- user = buffer_get_string(m, NULL);
+ if (!options.use_pam)
+ fatal("UsePAM not set, but ended up in %s anyway", __func__);
+
+ start_pam(authctxt);
+
+ monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
+
+ return (0);
+}
+
+int
+mm_answer_pam_account(int socket, Buffer *m)
+{
+ u_int ret;
+
+ if (!options.use_pam)
+ fatal("UsePAM not set, but ended up in %s anyway", __func__);
+
+ ret = do_pam_account();
+
+ buffer_put_int(m, ret);
+
+ mm_request_send(socket, MONITOR_ANS_PAM_ACCOUNT, m);
+
+ return (ret);
+}
+
+static void *sshpam_ctxt, *sshpam_authok;
+extern KbdintDevice sshpam_device;
+
+int
+mm_answer_pam_init_ctx(int socket, Buffer *m)
+{
+
+ debug3("%s", __func__);
+ authctxt->user = buffer_get_string(m, NULL);
+ sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
+ sshpam_authok = NULL;
+ buffer_clear(m);
+ if (sshpam_ctxt != NULL) {
+ monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
+ buffer_put_int(m, 1);
+ } else {
+ buffer_put_int(m, 0);
+ }
+ mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m);
+ return (0);
+}
+
+int
+mm_answer_pam_query(int socket, Buffer *m)
+{
+ char *name, *info, **prompts;
+ u_int num, *echo_on;
+ int i, ret;
- start_pam(user);
+ debug3("%s", __func__);
+ sshpam_authok = NULL;
+ ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
+ if (ret == 0 && num == 0)
+ sshpam_authok = sshpam_ctxt;
+ if (num > 1 || name == NULL || info == NULL)
+ ret = -1;
+ buffer_clear(m);
+ buffer_put_int(m, ret);
+ buffer_put_cstring(m, name);
+ xfree(name);
+ buffer_put_cstring(m, info);
+ xfree(info);
+ buffer_put_int(m, num);
+ for (i = 0; i < num; ++i) {
+ buffer_put_cstring(m, prompts[i]);
+ xfree(prompts[i]);
+ buffer_put_int(m, echo_on[i]);
+ }
+ if (prompts != NULL)
+ xfree(prompts);
+ if (echo_on != NULL)
+ xfree(echo_on);
+ mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m);
+ return (0);
+}
- xfree(user);
+int
+mm_answer_pam_respond(int socket, Buffer *m)
+{
+ char **resp;
+ u_int num;
+ int i, ret;
+ debug3("%s", __func__);
+ sshpam_authok = NULL;
+ num = buffer_get_int(m);
+ if (num > 0) {
+ resp = xmalloc(num * sizeof(char *));
+ for (i = 0; i < num; ++i)
+ resp[i] = buffer_get_string(m, NULL);
+ ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
+ for (i = 0; i < num; ++i)
+ xfree(resp[i]);
+ xfree(resp);
+ } else {
+ ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
+ }
+ buffer_clear(m);
+ buffer_put_int(m, ret);
+ mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m);
+ auth_method = "keyboard-interactive/pam";
+ if (ret == 0)
+ sshpam_authok = sshpam_ctxt;
return (0);
}
+
+int
+mm_answer_pam_free_ctx(int socket, Buffer *m)
+{
+
+ debug3("%s", __func__);
+ (sshpam_device.free_ctx)(sshpam_ctxt);
+ buffer_clear(m);
+ mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m);
+ return (sshpam_authok == sshpam_ctxt);
+}
#endif
static void
mm_answer_keyallowed(int socket, Buffer *m)
{
Key *key;
- u_char *cuser, *chost, *blob;
+ char *cuser, *chost;
+ u_char *blob;
u_int bloblen;
enum mm_keytype type = 0;
int allowed = 0;
debug3("%s: key_from_blob: %p", __func__, key);
- if (key != NULL && authctxt->pw != NULL) {
+ if (key != NULL && authctxt->valid) {
switch(type) {
case MM_USERKEY:
allowed = options.pubkey_authentication &&
fatal("%s: unknown key type %d", __func__, type);
break;
}
- key_free(key);
}
+ if (key != NULL)
+ key_free(key);
/* clear temporarily storage (used by verify) */
monitor_reset_key_state();
buffer_clear(m);
buffer_put_int(m, allowed);
+ buffer_put_int(m, forced_command != NULL);
mm_append_debug(m);
monitor_valid_userblob(u_char *data, u_int datalen)
{
Buffer b;
- u_char *p;
+ char *p;
u_int len;
int fail = 0;
fail++;
p = buffer_get_string(&b, NULL);
if (strcmp(authctxt->user, p) != 0) {
- log("wrong user name passed to monitor: expected %s != %.100s",
+ logit("wrong user name passed to monitor: expected %s != %.100s",
authctxt->user, p);
fail++;
}
}
static int
-monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
- u_char *chost)
+monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
+ char *chost)
{
Buffer b;
- u_char *p;
+ char *p;
u_int len;
int fail = 0;
fail++;
p = buffer_get_string(&b, NULL);
if (strcmp(authctxt->user, p) != 0) {
- log("wrong user name passed to monitor: expected %s != %.100s",
+ logit("wrong user name passed to monitor: expected %s != %.100s",
authctxt->user, p);
fail++;
}
* the address be 0.0.0.0.
*/
memset(&from, 0, sizeof(from));
+ fromlen = sizeof(from);
if (packet_connection_is_on_socket()) {
- fromlen = sizeof(from);
if (getpeername(packet_get_connection_in(),
(struct sockaddr *) & from, &fromlen) < 0) {
debug("getpeername: %.100s", strerror(errno));
- fatal_cleanup();
+ cleanup_exit(255);
}
}
/* Record that there was a login on that tty from the remote host. */
record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
- get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
- (struct sockaddr *)&from);
+ get_remote_name_or_ip(utmp_len, options.use_dns),
+ (struct sockaddr *)&from, fromlen);
}
static void
mm_session_close(Session *s)
{
- debug3("%s: session %d pid %d", __func__, s->self, s->pid);
+ debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
if (s->ttyfd != -1) {
debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
- fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
session_pty_cleanup2(s);
}
s->used = 0;
res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
if (res == 0)
goto error;
- fatal_add_cleanup(session_pty_cleanup2, (void *)s);
pty_setowner(authctxt->pw, s->tty);
buffer_put_int(m, 1);
}
buffer_clear(m);
buffer_put_int(m, allowed);
+ buffer_put_int(m, forced_command != NULL);
/* clear temporarily storage (used by generate challenge) */
monitor_reset_key_state();
key_blob = blob;
key_bloblen = blen;
key_blobtype = MM_RSAUSERKEY;
- key_free(key);
}
+ if (key != NULL)
+ key_free(key);
mm_append_debug(m);
mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
+
+ xfree(blob);
+ key_free(key);
return (0);
}
fatal("%s: received bad response to challenge", __func__);
success = auth_rsa_verify_response(key, ssh1_challenge, response);
+ xfree(blob);
key_free(key);
xfree(response);
(memcmp(kex->session_id, session_id2, session_id2_len) != 0))
fatal("mm_get_get: internal error: bad session id");
kex->we_need = buffer_get_int(m);
+ kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
+ kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
kex->server = 1;
kex->hostkey_type = buffer_get_int(m);
kex->kex_type = buffer_get_int(m);
Buffer m;
u_char *blob, *p;
u_int bloblen, plen;
+ u_int32_t seqnr, packets;
+ u_int64_t blocks;
debug3("%s: Waiting for new keys", __func__);
xfree(blob);
/* Now get sequence numbers for the packets */
- packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
- packet_set_seqnr(MODE_IN, buffer_get_int(&m));
+ seqnr = buffer_get_int(&m);
+ blocks = buffer_get_int64(&m);
+ packets = buffer_get_int(&m);
+ packet_set_state(MODE_OUT, seqnr, blocks, packets);
+ seqnr = buffer_get_int(&m);
+ blocks = buffer_get_int64(&m);
+ packets = buffer_get_int(&m);
+ packet_set_state(MODE_IN, seqnr, blocks, packets);
skip:
/* Get the key context */
void *
mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
{
- int len = size * ncount;
+ size_t len = (size_t) size * ncount;
void *address;
- if (len <= 0 || size > 65535 || ncount > 65535)
+ if (len == 0 || ncount > SIZE_T_MAX / size)
fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
address = mm_malloc(mm, len);
mon = xmalloc(sizeof(*mon));
+ mon->m_pid = 0;
monitor_socketpair(pair);
mon->m_recvfd = pair[0];
mon->m_recvfd = pair[0];
mon->m_sendfd = pair[1];
}
+
+#ifdef GSSAPI
+int
+mm_answer_gss_setup_ctx(int socket, Buffer *m)
+{
+ gss_OID_desc oid;
+ OM_uint32 major;
+ u_int len;
+
+ oid.elements = buffer_get_string(m, &len);
+ oid.length = len;
+
+ major = ssh_gssapi_server_ctx(&gsscontext, &oid);
+
+ xfree(oid.elements);
+
+ buffer_clear(m);
+ buffer_put_int(m, major);
+
+ mm_request_send(socket,MONITOR_ANS_GSSSETUP, m);
+
+ /* Now we have a context, enable the step */
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
+
+ return (0);
+}
+
+int
+mm_answer_gss_accept_ctx(int socket, Buffer *m)
+{
+ gss_buffer_desc in;
+ gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
+ OM_uint32 major,minor;
+ OM_uint32 flags = 0; /* GSI needs this */
+ u_int len;
+
+ in.value = buffer_get_string(m, &len);
+ in.length = len;
+ major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
+ xfree(in.value);
+
+ buffer_clear(m);
+ buffer_put_int(m, major);
+ buffer_put_string(m, out.value, out.length);
+ buffer_put_int(m, flags);
+ mm_request_send(socket, MONITOR_ANS_GSSSTEP, m);
+
+ gss_release_buffer(&minor, &out);
+
+ if (major==GSS_S_COMPLETE) {
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
+ }
+ return (0);
+}
+
+int
+mm_answer_gss_checkmic(int socket, Buffer *m)
+{
+ gss_buffer_desc gssbuf, mic;
+ OM_uint32 ret;
+ u_int len;
+
+ gssbuf.value = buffer_get_string(m, &len);
+ gssbuf.length = len;
+ mic.value = buffer_get_string(m, &len);
+ mic.length = len;
+
+ ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
+
+ xfree(gssbuf.value);
+ xfree(mic.value);
+
+ buffer_clear(m);
+ buffer_put_int(m, ret);
+
+ mm_request_send(socket, MONITOR_ANS_GSSCHECKMIC, m);
+
+ if (!GSS_ERROR(ret))
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
+
+ return (0);
+}
+
+int
+mm_answer_gss_userok(int socket, Buffer *m)
+{
+ int authenticated;
+
+ authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
+
+ buffer_clear(m);
+ buffer_put_int(m, authenticated);
+
+ debug3("%s: sending result %d", __func__, authenticated);
+ mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
+
+ auth_method="gssapi-with-mic";
+
+ /* Monitor loop will terminate if authenticated */
+ return (authenticated);
+}
+#endif /* GSSAPI */
andersk / openssh.git / blobdiff