X-Git-Url: http://andersk.mit.edu/gitweb/gssapi-openssh.git/blobdiff_plain/44a053a3174c2aaef640d35350c460003288be99..eabf5e199ea94140088fedf87e34251240be7359:/openssh/monitor_wrap.c

diff --git a/openssh/monitor_wrap.c b/openssh/monitor_wrap.c
index f7e332d..396ec32 100644
--- a/openssh/monitor_wrap.c
+++ b/openssh/monitor_wrap.c
@@ -25,7 +25,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: monitor_wrap.c,v 1.11 2002/06/19 18:01:00 markus Exp $");
+RCSID("$OpenBSD: monitor_wrap.c,v 1.35 2003/11/17 11:06:07 markus Exp $");
 
 #include <openssl/bn.h>
 #include <openssl/dh.h>
@@ -34,23 +34,35 @@ RCSID("$OpenBSD: monitor_wrap.c,v 1.11 2002/06/19 18:01:00 markus Exp $");
 #include "dh.h"
 #include "kex.h"
 #include "auth.h"
+#include "auth-options.h"
 #include "buffer.h"
 #include "bufaux.h"
 #include "packet.h"
 #include "mac.h"
 #include "log.h"
+#ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
+#undef TARGET_OS_MAC
 #include "zlib.h"
+#define TARGET_OS_MAC 1
+#else
+#include "zlib.h"
+#endif
 #include "monitor.h"
 #include "monitor_wrap.h"
 #include "xmalloc.h"
 #include "atomicio.h"
 #include "monitor_fdpass.h"
 #include "getput.h"
+#include "servconf.h"
 
 #include "auth.h"
 #include "channels.h"
 #include "session.h"
 
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+
 /* Imports */
 extern int compat20;
 extern Newkeys *newkeys[];
@@ -58,20 +70,31 @@ extern z_stream incoming_stream;
 extern z_stream outgoing_stream;
 extern struct monitor *pmonitor;
 extern Buffer input, output;
+extern ServerOptions options;
+
+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 socket, enum monitor_reqtype type, Buffer *m)
 {
-	u_char buf[5];
 	u_int mlen = buffer_len(m);
+	u_char buf[5];
 
 	debug3("%s entering: type %d", __func__, type);
 
 	PUT_32BIT(buf, mlen + 1);
 	buf[4] = (u_char) type;		/* 1st byte of payload is mesg-type */
-	if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf))
+	if (atomicio(vwrite, socket, buf, sizeof(buf)) != sizeof(buf))
 		fatal("%s: write", __func__);
-	if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen)
+	if (atomicio(vwrite, socket, buffer_ptr(m), mlen) != mlen)
 		fatal("%s: write", __func__);
 }
 
@@ -79,15 +102,15 @@ void
 mm_request_receive(int socket, Buffer *m)
 {
 	u_char buf[4];
-	ssize_t res;
 	u_int msg_len;
+	ssize_t res;
 
 	debug3("%s entering", __func__);
 
 	res = atomicio(read, socket, buf, sizeof(buf));
 	if (res != sizeof(buf)) {
 		if (res == 0)
-			fatal_cleanup();
+			cleanup_exit(255);
 		fatal("%s: read: %ld", __func__, (long)res);
 	}
 	msg_len = GET_32BIT(buf);
@@ -207,7 +230,8 @@ mm_getpwnamallow(const char *login)
 	return (pw);
 }
 
-char* mm_auth2_read_banner(void)
+char *
+mm_auth2_read_banner(void)
 {
 	Buffer m;
 	char *banner;
@@ -218,10 +242,16 @@ char* mm_auth2_read_banner(void)
 	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 	buffer_clear(&m);
 
-	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m);
+	mm_request_receive_expect(pmonitor->m_recvfd,
+	    MONITOR_ANS_AUTH2_READ_BANNER, &m);
 	banner = buffer_get_string(&m, NULL);
 	buffer_free(&m);
 
+	/* treat empty banner as missing banner */
+	if (strlen(banner) == 0) {
+		xfree(banner);
+		banner = NULL;
+	}
 	return (banner);
 }
 
@@ -312,7 +342,7 @@ mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 	Buffer m;
 	u_char *blob;
 	u_int len;
-	int allowed = 0;
+	int allowed = 0, have_forced = 0;
 
 	debug3("%s entering", __func__);
 
@@ -334,6 +364,11 @@ mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 
 	allowed = buffer_get_int(&m);
 
+	/* fake forced command */
+	auth_clear_options();
+	have_forced = buffer_get_int(&m);
+	forced_command = have_forced ? xstrdup("true") : NULL;
+
 	/* Send potential debug messages */
 	mm_send_debug(&m);
 
@@ -411,7 +446,7 @@ mm_newkeys_from_blob(u_char *blob, int blen)
 	enc->key = buffer_get_string(&b, &enc->key_len);
 	enc->iv = buffer_get_string(&b, &len);
 	if (len != enc->block_size)
-		fatal("%s: bad ivlen: expected %d != %d", __func__,
+		fatal("%s: bad ivlen: expected %u != %u", __func__,
 		    enc->block_size, len);
 
 	if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
@@ -425,7 +460,7 @@ mm_newkeys_from_blob(u_char *blob, int blen)
 	mac->enabled = buffer_get_int(&b);
 	mac->key = buffer_get_string(&b, &len);
 	if (len > mac->key_len)
-		fatal("%s: bad mac key length: %d > %d", __func__, len,
+		fatal("%s: bad mac key length: %u > %d", __func__, len,
 		    mac->key_len);
 	mac->key_len = len;
 
@@ -436,7 +471,7 @@ mm_newkeys_from_blob(u_char *blob, int blen)
 
 	len = buffer_len(&b);
 	if (len != 0)
-		error("newkeys_from_blob: remaining bytes in blob %d", len);
+		error("newkeys_from_blob: remaining bytes in blob %u", len);
 	buffer_free(&b);
 	return (newkey);
 }
@@ -446,7 +481,6 @@ mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 {
 	Buffer b;
 	int len;
-	u_char *buf;
 	Enc *enc;
 	Mac *mac;
 	Comp *comp;
@@ -484,14 +518,14 @@ mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 	buffer_put_cstring(&b, comp->name);
 
 	len = buffer_len(&b);
-	buf = xmalloc(len);
-	memcpy(buf, buffer_ptr(&b), len);
-	memset(buffer_ptr(&b), 0, len);
-	buffer_free(&b);
 	if (lenp != NULL)
 		*lenp = len;
-	if (blobp != NULL)
-		*blobp = buf;
+	if (blobp != NULL) {
+		*blobp = xmalloc(len);
+		memcpy(*blobp, buffer_ptr(&b), len);
+	}
+	memset(buffer_ptr(&b), 0, len);
+	buffer_free(&b);
 	return len;
 }
 
@@ -515,6 +549,8 @@ mm_send_keystate(struct monitor *pmonitor)
 	Buffer m;
 	u_char *blob, *p;
 	u_int bloblen, plen;
+	u_int32_t seqnr, packets;
+	u_int64_t blocks;
 
 	buffer_init(&m);
 
@@ -563,8 +599,14 @@ mm_send_keystate(struct monitor *pmonitor)
 	buffer_put_string(&m, blob, bloblen);
 	xfree(blob);
 
-	buffer_put_int(&m, packet_get_seqnr(MODE_OUT));
-	buffer_put_int(&m, packet_get_seqnr(MODE_IN));
+	packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
+	buffer_put_int(&m, seqnr);
+	buffer_put_int64(&m, blocks);
+	buffer_put_int(&m, packets);
+	packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
+	buffer_put_int(&m, seqnr);
+	buffer_put_int64(&m, blocks);
+	buffer_put_int(&m, packets);
 
 	debug3("%s: New keys have been sent", __func__);
  skip:
@@ -600,7 +642,7 @@ int
 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
 {
 	Buffer m;
-	u_char *p;
+	char *p;
 	int success = 0;
 
 	buffer_init(&m);
@@ -629,9 +671,8 @@ mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
 }
 
 void
-mm_session_pty_cleanup2(void *session)
+mm_session_pty_cleanup2(Session *s)
 {
-	Session *s = session;
 	Buffer m;
 
 	if (s->ttyfd == -1)
@@ -651,19 +692,125 @@ mm_session_pty_cleanup2(void *session)
 
 #ifdef USE_PAM
 void
-mm_start_pam(char *user)
+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);
-	buffer_put_cstring(&m, user);
-
 	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;
+
+	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);
+
+	buffer_free(&m);
+
+	debug3("%s returning %d", __func__, ret);
+
+	return (ret);
+}
+
+void *
+mm_sshpam_init_ctx(Authctxt *authctxt)
+{
+	Buffer m;
+	int success;
+
+	debug3("%s", __func__);
+	buffer_init(&m);
+	buffer_put_cstring(&m, authctxt->user);
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
+	debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
+	success = buffer_get_int(&m);
+	if (success == 0) {
+		debug3("%s: pam_init_ctx failed", __func__);
+		buffer_free(&m);
+		return (NULL);
+	}
+	buffer_free(&m);
+	return (authctxt);
+}
+
+int
+mm_sshpam_query(void *ctx, char **name, char **info,
+    u_int *num, char ***prompts, u_int **echo_on)
+{
+	Buffer m;
+	int i, ret;
+
+	debug3("%s", __func__);
+	buffer_init(&m);
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
+	debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
+	ret = buffer_get_int(&m);
+	debug3("%s: pam_query returned %d", __func__, ret);
+	*name = buffer_get_string(&m, NULL);
+	*info = buffer_get_string(&m, NULL);
+	*num = buffer_get_int(&m);
+	*prompts = xmalloc((*num + 1) * sizeof(char *));
+	*echo_on = xmalloc((*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;
+	int i, 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 */
@@ -705,7 +852,7 @@ mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 	*name = xstrdup("");
 	*infotxt = xstrdup("");
 	*numprompts = 1;
-	*prompts = xmalloc(*numprompts * sizeof(char*));
+	*prompts = xmalloc(*numprompts * sizeof(char *));
 	*echo_on = xmalloc(*numprompts * sizeof(u_int));
 	(*echo_on)[0] = 0;
 }
@@ -715,7 +862,7 @@ mm_bsdauth_query(void *ctx, char **name, char **infotxt,
    u_int *numprompts, char ***prompts, u_int **echo_on)
 {
 	Buffer m;
-	int res;
+	u_int success;
 	char *challenge;
 
 	debug3("%s: entering", __func__);
@@ -725,8 +872,8 @@ mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 
 	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 	    &m);
-	res = buffer_get_int(&m);
-	if (res == -1) {
+	success = buffer_get_int(&m);
+	if (success == 0) {
 		debug3("%s: no challenge", __func__);
 		buffer_free(&m);
 		return (-1);
@@ -772,7 +919,8 @@ mm_skey_query(void *ctx, char **name, char **infotxt,
    u_int *numprompts, char ***prompts, u_int **echo_on)
 {
 	Buffer m;
-	int len, res;
+	int len;
+	u_int success;
 	char *p, *challenge;
 
 	debug3("%s: entering", __func__);
@@ -782,8 +930,8 @@ mm_skey_query(void *ctx, char **name, char **infotxt,
 
 	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 	    &m);
-	res = buffer_get_int(&m);
-	if (res == -1) {
+	success = buffer_get_int(&m);
+	if (success == 0) {
 		debug3("%s: no challenge", __func__);
 		buffer_free(&m);
 		return (-1);
@@ -853,7 +1001,7 @@ mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
 	Key *key;
 	u_char *blob;
 	u_int blen;
-	int allowed = 0;
+	int allowed = 0, have_forced = 0;
 
 	debug3("%s entering", __func__);
 
@@ -865,6 +1013,11 @@ mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
 
 	allowed = buffer_get_int(&m);
 
+	/* fake forced command */
+	auth_clear_options();
+	have_forced = buffer_get_int(&m);
+	forced_command = have_forced ? xstrdup("true") : NULL;
+
 	if (allowed && rkey != NULL) {
 		blob = buffer_get_string(&m, &blen);
 		if ((key = key_from_blob(blob, blen)) == NULL)
@@ -937,3 +1090,187 @@ mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
 
 	return (success);
 }
+
+#ifdef GSSAPI
+OM_uint32
+mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
+{
+	Buffer m;
+	OM_uint32 major;
+
+	/* Client doesn't get to see the context */
+	*ctx = NULL;
+
+	buffer_init(&m);
+	buffer_put_string(&m, oid->elements, oid->length);
+
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
+
+	major = buffer_get_int(&m);
+
+	buffer_free(&m);
+	return (major);
+}
+
+OM_uint32
+mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
+    gss_buffer_desc *out, OM_uint32 *flags)
+{
+	Buffer m;
+	OM_uint32 major;
+	u_int len;
+
+	buffer_init(&m);
+	buffer_put_string(&m, in->value, in->length);
+
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
+
+	major = buffer_get_int(&m);
+	out->value = buffer_get_string(&m, &len);
+	out->length = len;
+	if (flags)
+		*flags = buffer_get_int(&m);
+
+	buffer_free(&m);
+
+	return (major);
+}
+
+OM_uint32
+mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
+{
+	Buffer m;
+	OM_uint32 major;
+
+	buffer_init(&m);
+	buffer_put_string(&m, gssbuf->value, gssbuf->length);
+	buffer_put_string(&m, gssmic->value, gssmic->length);
+
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
+	    &m);
+
+	major = buffer_get_int(&m);
+	buffer_free(&m);
+	return(major);
+}
+
+int
+mm_ssh_gssapi_userok(char *user)
+{
+	Buffer m;
+	int authenticated = 0;
+
+	buffer_init(&m);
+
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
+				  &m);
+
+	authenticated = buffer_get_int(&m);
+
+	buffer_free(&m);
+	debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
+	return (authenticated);
+}
+
+OM_uint32
+mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash) {
+        Buffer m;
+        OM_uint32 major;
+	u_int len;
+
+        buffer_init(&m);
+        buffer_put_string(&m, data->value, data->length);
+
+        mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, &m);
+        mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, &m);
+
+        major=buffer_get_int(&m);
+        hash->value = buffer_get_string(&m, &len);
+	hash->length = len;
+
+	buffer_free(&m);
+	
+        return(major);
+}
+
+char *
+mm_ssh_gssapi_last_error(Gssctxt *ctx, OM_uint32 *major, OM_uint32 *minor) {
+	Buffer m;
+	OM_uint32 maj,min;
+	char *errstr;
+	
+	buffer_init(&m);
+
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSERR, &m);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSERR, &m);
+
+	maj = buffer_get_int(&m);
+	min = buffer_get_int(&m);
+
+	if (major) *major=maj;
+	if (minor) *minor=min;
+	
+	errstr=buffer_get_string(&m,NULL);
+
+	buffer_free(&m);
+	
+	return(errstr);
+}	
+
+OM_uint32
+mm_gss_indicate_mechs(OM_uint32 *minor_status, gss_OID_set *mech_set)
+{
+        Buffer m;
+	OM_uint32 major,minor;
+	int count;
+	gss_OID_desc oid;
+        u_int length;
+
+	buffer_init(&m);
+
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSMECHS, &m);
+        mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSMECHS,
+				  &m);
+        major=buffer_get_int(&m);
+	count=buffer_get_int(&m);
+	
+        gss_create_empty_oid_set(&minor,mech_set);
+	while(count-->0) {
+	    oid.elements=buffer_get_string(&m,&length);
+	    oid.length=length;
+	    gss_add_oid_set_member(&minor,&oid,mech_set);
+	}
+
+	buffer_free(&m);
+	
+        return(major);
+}
+
+int
+mm_ssh_gssapi_localname(char **lname)
+{
+        Buffer m;
+
+	buffer_init(&m);
+        mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSLOCALNAME, &m);
+
+        debug3("%s: waiting for MONITOR_ANS_GSSLOCALNAME", __func__);
+        mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSLOCALNAME,
+                                  &m);
+
+	*lname = buffer_get_string(&m, NULL);
+
+        buffer_free(&m);
+	if (lname[0] == '\0') {
+	    debug3("%s: gssapi identity mapping failed", __func__);
+	} else {
+	    debug3("%s: gssapi identity mapped to %s", __func__, *lname);
+	}
+	
+        return(0);
+}	
+#endif /* GSSAPI */