X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/05114c7476ac506bb6129dee9df34c771cfce817..34f2baf0f5d9dad08aaed92f16ee660b9c150d65:/monitor_wrap.c

diff --git a/monitor_wrap.c b/monitor_wrap.c
index a83413a5..0d7a0e3b 100644
--- a/monitor_wrap.c
+++ b/monitor_wrap.c
@@ -25,7 +25,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: monitor_wrap.c,v 1.26 2003/04/07 08:29:57 markus Exp $");
+RCSID("$OpenBSD: monitor_wrap.c,v 1.39 2004/07/17 05:31:41 dtucker Exp $");
 
 #include <openssl/bn.h>
 #include <openssl/dh.h>
@@ -40,18 +40,29 @@ RCSID("$OpenBSD: monitor_wrap.c,v 1.26 2003/04/07 08:29:57 markus Exp $");
 #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[];
@@ -59,9 +70,21 @@ extern z_stream incoming_stream;
 extern z_stream outgoing_stream;
 extern struct monitor *pmonitor;
 extern Buffer input, output;
+extern Buffer loginmsg;
+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)
+mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
 {
 	u_int mlen = buffer_len(m);
 	u_char buf[5];
@@ -70,14 +93,14 @@ mm_request_send(int socket, enum monitor_reqtype type, Buffer *m)
 
 	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, sock, buf, sizeof(buf)) != sizeof(buf))
 		fatal("%s: write", __func__);
-	if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen)
+	if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 		fatal("%s: write", __func__);
 }
 
 void
-mm_request_receive(int socket, Buffer *m)
+mm_request_receive(int sock, Buffer *m)
 {
 	u_char buf[4];
 	u_int msg_len;
@@ -85,10 +108,10 @@ mm_request_receive(int socket, Buffer *m)
 
 	debug3("%s entering", __func__);
 
-	res = atomicio(read, socket, buf, sizeof(buf));
+	res = atomicio(read, sock, 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);
@@ -96,19 +119,19 @@ mm_request_receive(int socket, Buffer *m)
 		fatal("%s: read: bad msg_len %d", __func__, msg_len);
 	buffer_clear(m);
 	buffer_append_space(m, msg_len);
-	res = atomicio(read, socket, buffer_ptr(m), msg_len);
+	res = atomicio(read, sock, buffer_ptr(m), msg_len);
 	if (res != msg_len)
 		fatal("%s: read: %ld != msg_len", __func__, (long)res);
 }
 
 void
-mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m)
+mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 {
 	u_char rtype;
 
 	debug3("%s entering: type %d", __func__, type);
 
-	mm_request_receive(socket, m);
+	mm_request_receive(sock, m);
 	rtype = buffer_get_char(m);
 	if (rtype != type)
 		fatal("%s: read: rtype %d != type %d", __func__,
@@ -172,7 +195,7 @@ mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 }
 
 struct passwd *
-mm_getpwnamallow(const char *login)
+mm_getpwnamallow(const char *username)
 {
 	Buffer m;
 	struct passwd *pw;
@@ -181,7 +204,7 @@ mm_getpwnamallow(const char *login)
 	debug3("%s entering", __func__);
 
 	buffer_init(&m);
-	buffer_put_cstring(&m, login);
+	buffer_put_cstring(&m, username);
 
 	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 
@@ -208,7 +231,8 @@ mm_getpwnamallow(const char *login)
 	return (pw);
 }
 
-char *mm_auth2_read_banner(void)
+char *
+mm_auth2_read_banner(void)
 {
 	Buffer m;
 	char *banner;
@@ -219,10 +243,16 @@ 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);
 }
 
@@ -515,7 +545,7 @@ mm_send_kex(Buffer *m, Kex *kex)
 }
 
 void
-mm_send_keystate(struct monitor *pmonitor)
+mm_send_keystate(struct monitor *monitor)
 {
 	Buffer m;
 	u_char *blob, *p;
@@ -551,7 +581,7 @@ mm_send_keystate(struct monitor *pmonitor)
 		goto skip;
 	} else {
 		/* Kex for rekeying */
-		mm_send_kex(&m, *pmonitor->m_pkex);
+		mm_send_kex(&m, *monitor->m_pkex);
 	}
 
 	debug3("%s: Sending new keys: %p %p",
@@ -603,7 +633,7 @@ mm_send_keystate(struct monitor *pmonitor)
 	buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 	buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 
-	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
+	mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 	debug3("%s: Finished sending state", __func__);
 
 	buffer_free(&m);
@@ -613,7 +643,7 @@ int
 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
 {
 	Buffer m;
-	char *p;
+	char *p, *msg;
 	int success = 0;
 
 	buffer_init(&m);
@@ -629,11 +659,15 @@ mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
 		return (0);
 	}
 	p = buffer_get_string(&m, NULL);
+	msg = buffer_get_string(&m, NULL);
 	buffer_free(&m);
 
 	strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 	xfree(p);
 
+	buffer_append(&loginmsg, msg, strlen(msg));
+	xfree(msg);
+
 	*ptyfd = mm_receive_fd(pmonitor->m_recvfd);
 	*ttyfd = mm_receive_fd(pmonitor->m_recvfd);
 
@@ -642,9 +676,8 @@ 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)
@@ -664,20 +697,44 @@ 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)
 {
@@ -862,6 +919,7 @@ mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 	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)
@@ -925,6 +983,7 @@ mm_skey_respond(void *ctx, u_int numresponses, char **responses)
 
 	return ((authok == 0) ? -1 : 0);
 }
+#endif /* SKEY */
 
 void
 mm_ssh1_session_id(u_char session_id[16])
@@ -1039,73 +1098,88 @@ mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
 	return (success);
 }
 
-#ifdef KRB4
-int
-mm_auth_krb4(Authctxt *authctxt, void *_auth, char **client, void *_reply)
+#ifdef GSSAPI
+OM_uint32
+mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
 {
-	KTEXT auth, reply;
- 	Buffer m;
-	u_int rlen;
-	int success = 0;
-	char *p;
+	Buffer m;
+	OM_uint32 major;
 
-	debug3("%s entering", __func__);
-	auth = _auth;
-	reply = _reply;
+	/* Client doesn't get to see the context */
+	*ctx = NULL;
 
 	buffer_init(&m);
-	buffer_put_string(&m, auth->dat, auth->length);
+	buffer_put_string(&m, goid->elements, goid->length);
 
-	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB4, &m);
-	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB4, &m);
+	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);
 
-	success = buffer_get_int(&m);
-	if (success) {
-		*client = buffer_get_string(&m, NULL);
-		p = buffer_get_string(&m, &rlen);
-		if (rlen >= MAX_KTXT_LEN)
-			fatal("%s: reply from monitor too large", __func__);
-		reply->length = rlen;
-		memcpy(reply->dat, p, rlen);
-		memset(p, 0, rlen);
-		xfree(p);
-	}
 	buffer_free(&m);
-	return (success);
+	return (major);
 }
-#endif
 
-#ifdef KRB5
-int
-mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp)
+OM_uint32
+mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
+    gss_buffer_desc *out, OM_uint32 *flags)
 {
-	krb5_data *tkt, *reply;
 	Buffer m;
-	int success;
+	OM_uint32 major;
+	u_int len;
 
-	debug3("%s entering", __func__);
-	tkt = (krb5_data *) argp;
-	reply = (krb5_data *) resp;
+	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, tkt->data, tkt->length);
+	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);
 
-	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m);
-	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m);
+	major = buffer_get_int(&m);
+	buffer_free(&m);
+	return(major);
+}
 
-	success = buffer_get_int(&m);
-	if (success) {
-		u_int len;
+int
+mm_ssh_gssapi_userok(char *user)
+{
+	Buffer m;
+	int authenticated = 0;
 
-		*userp = buffer_get_string(&m, NULL);
-		reply->data = buffer_get_string(&m, &len);
-		reply->length = len;
-	} else {
-		memset(reply, 0, sizeof(*reply));
-		*userp = NULL;
-	}
+	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);
-	return (success);
+	debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
+	return (authenticated);
 }
-#endif
+#endif /* GSSAPI */