X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/af774732e689a492c7d9684bf0dcc9e6f303750c..7364bd04fc18484f99f74b901c4581795bcf2787:/auth2.c

diff --git a/auth2.c b/auth2.c
index cd3886dc..4a305a41 100644
--- a/auth2.c
+++ b/auth2.c
@@ -23,138 +23,114 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: auth2.c,v 1.42 2001/02/13 22:49:40 markus Exp $");
-
-#include <openssl/evp.h>
+RCSID("$OpenBSD: auth2.c,v 1.100 2003/08/22 10:56:08 markus Exp $");
 
 #include "ssh2.h"
 #include "xmalloc.h"
-#include "rsa.h"
-#include "pty.h"
 #include "packet.h"
-#include "buffer.h"
 #include "log.h"
 #include "servconf.h"
 #include "compat.h"
-#include "channels.h"
-#include "bufaux.h"
 #include "auth.h"
-#include "session.h"
 #include "dispatch.h"
-#include "key.h"
-#include "cipher.h"
-#include "kex.h"
 #include "pathnames.h"
-#include "uidswap.h"
-#include "auth-options.h"
+#include "monitor_wrap.h"
+
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
 
 /* import */
 extern ServerOptions options;
 extern u_char *session_id2;
-extern int session_id2_len;
+extern u_int session_id2_len;
 
-#ifdef WITH_AIXAUTHENTICATE
-extern char *aixloginmsg;
-#endif
+Authctxt *x_authctxt = NULL;
 
-static Authctxt	*x_authctxt = NULL;
-static int one = 1;
+/* methods */
+
+extern Authmethod method_none;
+extern Authmethod method_pubkey;
+extern Authmethod method_passwd;
+extern Authmethod method_kbdint;
+extern Authmethod method_hostbased;
+#ifdef KRB5
+extern Authmethod method_kerberos;
+#endif
+#ifdef GSSAPI
+extern Authmethod method_gssapi;
+#endif
 
-typedef struct Authmethod Authmethod;
-struct Authmethod {
-	char	*name;
-	int	(*userauth)(Authctxt *authctxt);
-	int	*enabled;
+Authmethod *authmethods[] = {
+	&method_none,
+	&method_pubkey,
+#ifdef GSSAPI
+	&method_gssapi,
+#endif
+	&method_passwd,
+	&method_kbdint,
+	&method_hostbased,
+#ifdef KRB5
+	&method_kerberos,
+#endif
+	NULL
 };
 
 /* protocol */
 
-void	input_service_request(int type, int plen, void *ctxt);
-void	input_userauth_request(int type, int plen, void *ctxt);
-void	protocol_error(int type, int plen, void *ctxt);
+static void input_service_request(int, u_int32_t, void *);
+static void input_userauth_request(int, u_int32_t, void *);
 
 /* helper */
-Authmethod	*authmethod_lookup(const char *name);
-struct passwd	*pwcopy(struct passwd *pw);
-int	user_key_allowed(struct passwd *pw, Key *key);
-char	*authmethods_get(void);
-
-/* auth */
-void	userauth_banner(void);
-int	userauth_none(Authctxt *authctxt);
-int	userauth_passwd(Authctxt *authctxt);
-int	userauth_pubkey(Authctxt *authctxt);
-int	userauth_kbdint(Authctxt *authctxt);
-
-Authmethod authmethods[] = {
-	{"none",
-		userauth_none,
-		&one},
-	{"publickey",
-		userauth_pubkey,
-		&options.pubkey_authentication},
-	{"password",
-		userauth_passwd,
-		&options.password_authentication},
-	{"keyboard-interactive",
-		userauth_kbdint,
-		&options.kbd_interactive_authentication},
-	{NULL, NULL, NULL}
-};
+static Authmethod *authmethod_lookup(const char *);
+static char *authmethods_get(void);
+int user_key_allowed(struct passwd *, Key *);
+int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
 
 /*
  * loop until authctxt->success == TRUE
  */
 
-void
-do_authentication2()
+Authctxt *
+do_authentication2(void)
 {
 	Authctxt *authctxt = authctxt_new();
 
 	x_authctxt = authctxt;		/*XXX*/
 
-	/* challenge-reponse is implemented via keyboard interactive */
-	if (options.challenge_reponse_authentication)
+	/* challenge-response is implemented via keyboard interactive */
+	if (options.challenge_response_authentication)
 		options.kbd_interactive_authentication = 1;
 
-	dispatch_init(&protocol_error);
+	dispatch_init(&dispatch_protocol_error);
 	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
 	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
-	do_authenticated2(authctxt);
-}
 
-void
-protocol_error(int type, int plen, void *ctxt)
-{
-	log("auth: protocol error: type %d plen %d", type, plen);
-	packet_start(SSH2_MSG_UNIMPLEMENTED);
-	packet_put_int(0);
-	packet_send();
-	packet_write_wait();
+	return (authctxt);
 }
 
-void
-input_service_request(int type, int plen, void *ctxt)
+static void
+input_service_request(int type, u_int32_t seq, void *ctxt)
 {
 	Authctxt *authctxt = ctxt;
 	u_int len;
-	int accept = 0;
+	int acceptit = 0;
 	char *service = packet_get_string(&len);
-	packet_done();
+	packet_check_eom();
 
 	if (authctxt == NULL)
 		fatal("input_service_request: no authctxt");
 
 	if (strcmp(service, "ssh-userauth") == 0) {
 		if (!authctxt->success) {
-			accept = 1;
+			acceptit = 1;
 			/* now we can handle user-auth requests */
 			dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
 		}
 	}
 	/* XXX all other service requests are denied */
 
-	if (accept) {
+	if (acceptit) {
 		packet_start(SSH2_MSG_SERVICE_ACCEPT);
 		packet_put_cstring(service);
 		packet_send();
@@ -166,8 +142,8 @@ input_service_request(int type, int plen, void *ctxt)
 	xfree(service);
 }
 
-void
-input_userauth_request(int type, int plen, void *ctxt)
+static void
+input_userauth_request(int type, u_int32_t seq, void *ctxt)
 {
 	Authctxt *authctxt = ctxt;
 	Authmethod *m = NULL;
@@ -188,49 +164,62 @@ input_userauth_request(int type, int plen, void *ctxt)
 
 	if (authctxt->attempt++ == 0) {
 		/* setup auth context */
-		struct passwd *pw = NULL;
-		pw = getpwnam(user);
-		if (pw && allowed_user(pw) && strcmp(service, "ssh-connection")==0) {
-			authctxt->pw = pwcopy(pw);
+		authctxt->pw = PRIVSEP(getpwnamallow(user));
+		if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
 			authctxt->valid = 1;
 			debug2("input_userauth_request: setting up authctxt for %s", user);
 #ifdef USE_PAM
-			start_pam(pw->pw_name);
+			if (options.use_pam)
+				PRIVSEP(start_pam(authctxt->pw->pw_name));
 #endif
 		} else {
-			log("input_userauth_request: illegal user %s", user);
+			logit("input_userauth_request: illegal user %s", user);
 #ifdef USE_PAM
-			start_pam("NOUSER");
+			if (options.use_pam)
+				PRIVSEP(start_pam(user));
 #endif
 		}
-		setproctitle("%s", pw ? user : "unknown");
+		setproctitle("%s%s", authctxt->pw ? user : "unknown",
+		    use_privsep ? " [net]" : "");
 		authctxt->user = xstrdup(user);
 		authctxt->service = xstrdup(service);
-		authctxt->style = style ? xstrdup(style) : NULL; /* currently unused */
-	} else if (authctxt->valid) {
-		if (strcmp(user, authctxt->user) != 0 ||
-		    strcmp(service, authctxt->service) != 0) {
-			log("input_userauth_request: missmatch: (%s,%s)!=(%s,%s)",
-			    user, service, authctxt->user, authctxt->service);
-			authctxt->valid = 0;
-		}
+		authctxt->style = style ? xstrdup(style) : NULL;
+		if (use_privsep)
+			mm_inform_authserv(service, style);
+	} else if (strcmp(user, authctxt->user) != 0 ||
+	    strcmp(service, authctxt->service) != 0) {
+		packet_disconnect("Change of username or service not allowed: "
+		    "(%s,%s) -> (%s,%s)",
+		    authctxt->user, authctxt->service, user, service);
 	}
 	/* reset state */
-	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, &protocol_error);
-	authctxt->postponed = 0;
-#ifdef BSD_AUTH
-	if (authctxt->as) {
-		auth_close(authctxt->as);
-		authctxt->as = NULL;
-	}
+	auth2_challenge_stop(authctxt);
+
+#ifdef GSSAPI
+	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
+	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
 #endif
 
+	authctxt->postponed = 0;
+
 	/* try to authenticate user */
 	m = authmethod_lookup(method);
 	if (m != NULL) {
 		debug2("input_userauth_request: try method %s", method);
 		authenticated =	m->userauth(authctxt);
 	}
+	userauth_finish(authctxt, authenticated, method);
+
+	xfree(service);
+	xfree(user);
+	xfree(method);
+}
+
+void
+userauth_finish(Authctxt *authctxt, int authenticated, char *method)
+{
+	char *methods;
+
 	if (!authctxt->valid && authenticated)
 		fatal("INTERNAL ERROR: authenticated invalid user %s",
 		    authctxt->user);
@@ -241,72 +230,27 @@ input_userauth_request(int type, int plen, void *ctxt)
 		authenticated = 0;
 
 #ifdef USE_PAM
-	if (authenticated && authctxt->user && !do_pam_account(authctxt->user,
-	    NULL))
+	if (options.use_pam && authenticated && !PRIVSEP(do_pam_account()))
+		authenticated = 0;
+#endif
+
+#ifdef _UNICOS
+	if (authenticated && cray_access_denied(authctxt->user)) {
 		authenticated = 0;
-#endif /* USE_PAM */
+		fatal("Access denied for user %s.",authctxt->user);
+	}
+#endif /* _UNICOS */
 
 	/* Log before sending the reply */
 	auth_log(authctxt, authenticated, method, " ssh2");
 
-	if (!authctxt->postponed)
-		userauth_reply(authctxt, authenticated);
-
-	xfree(service);
-	xfree(user);
-	xfree(method);
-}
-
-void
-userauth_banner(void)
-{
-	struct stat st;
-	char *banner = NULL;
-	off_t len, n;
-	int fd;
-
-	if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
-		return;
-	if ((fd = open(options.banner, O_RDONLY)) < 0) {
-		error("userauth_banner: open %s failed: %s",
-		    options.banner, strerror(errno));
+	if (authctxt->postponed)
 		return;
-	}
-	if (fstat(fd, &st) < 0)
-		goto done;
-	len = st.st_size;
-	banner = xmalloc(len + 1);
-	if ((n = read(fd, banner, len)) < 0)
-		goto done;
-	banner[n] = '\0';
-	packet_start(SSH2_MSG_USERAUTH_BANNER);
-	packet_put_cstring(banner);
-	packet_put_cstring("");		/* language, unused */
-	packet_send();
-	debug("userauth_banner: sent");
-done:
-	if (banner)
-		xfree(banner);
-	close(fd);
-	return;
-}
-
-void
-userauth_reply(Authctxt *authctxt, int authenticated)
-{
-	char *methods;
 
 	/* XXX todo: check if multiple auth methods are needed */
 	if (authenticated == 1) {
-#ifdef WITH_AIXAUTHENTICATE
-		/* We don't have a pty yet, so just label the line as "ssh" */
-		if (loginsuccess(authctxt->user?authctxt->user:"NOUSER",
-		    get_canonical_hostname(options.reverse_mapping_check),
-		    "ssh", &aixloginmsg) < 0)
-			aixloginmsg = NULL;
-#endif /* WITH_AIXAUTHENTICATE */
 		/* turn off userauth */
-		dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &protocol_error);
+		dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
 		packet_start(SSH2_MSG_USERAUTH_SUCCESS);
 		packet_send();
 		packet_write_wait();
@@ -325,196 +269,6 @@ userauth_reply(Authctxt *authctxt, int authenticated)
 	}
 }
 
-int
-userauth_none(Authctxt *authctxt)
-{
-	/* disable method "none", only allowed one time */
-	Authmethod *m = authmethod_lookup("none");
-	if (m != NULL)
-		m->enabled = NULL;
-	packet_done();
-	userauth_banner();
-
-	if (authctxt->valid == 0)
-		return(0);
-
-#ifdef HAVE_CYGWIN
-	if (check_nt_auth(1, authctxt->pw->pw_uid) == 0)
-		return(0);
-#endif
-#ifdef USE_PAM
-	return auth_pam_password(authctxt->pw, "");
-#elif defined(HAVE_OSF_SIA)
-	return 0;
-#else /* !HAVE_OSF_SIA && !USE_PAM */
-	return auth_password(authctxt, "");
-#endif /* USE_PAM */
-}
-
-int
-userauth_passwd(Authctxt *authctxt)
-{
-	char *password;
-	int authenticated = 0;
-	int change;
-	u_int len;
-	change = packet_get_char();
-	if (change)
-		log("password change not supported");
-	password = packet_get_string(&len);
-	packet_done();
-	if (authctxt->valid &&
-#ifdef HAVE_CYGWIN
-		check_nt_auth(1, authctxt->pw->pw_uid) &&
-#endif
-#ifdef USE_PAM
-	    auth_pam_password(authctxt->pw, password) == 1)
-#elif defined(HAVE_OSF_SIA)
-	    auth_sia_password(authctxt->user, password) == 1)
-#else /* !USE_PAM && !HAVE_OSF_SIA */
-	    auth_password(authctxt, password) == 1)
-#endif /* USE_PAM */
-		authenticated = 1;
-	memset(password, 0, len);
-	xfree(password);
-	return authenticated;
-}
-
-int
-userauth_kbdint(Authctxt *authctxt)
-{
-	int authenticated = 0;
-	char *lang = NULL;
-	char *devs = NULL;
-
-	lang = packet_get_string(NULL);
-	devs = packet_get_string(NULL);
-	packet_done();
-
-	debug("keyboard-interactive language %s devs %s", lang, devs);
-
-	if (options.challenge_reponse_authentication)
-		authenticated = auth2_challenge(authctxt, devs);
-
-#ifdef USE_PAM
-	if (authenticated == 0)
-		authenticated = auth2_pam(authctxt);
-#endif
-	xfree(lang);
-	xfree(devs);
-#ifdef HAVE_CYGWIN
-	if (check_nt_auth(0, authctxt->pw->pw_uid) == 0)
-		return(0);
-#endif
-	return authenticated;
-}
-
-int
-userauth_pubkey(Authctxt *authctxt)
-{
-	Buffer b;
-	Key *key;
-	char *pkalg, *pkblob, *sig;
-	u_int alen, blen, slen;
-	int have_sig, pktype;
-	int authenticated = 0;
-
-	if (!authctxt->valid) {
-		debug2("userauth_pubkey: disabled because of invalid user");
-		return 0;
-	}
-	have_sig = packet_get_char();
-	if (datafellows & SSH_BUG_PKAUTH) {
-		debug2("userauth_pubkey: SSH_BUG_PKAUTH");
-		/* no explicit pkalg given */
-		pkblob = packet_get_string(&blen);
-		buffer_init(&b);
-		buffer_append(&b, pkblob, blen);
-		/* so we have to extract the pkalg from the pkblob */
-		pkalg = buffer_get_string(&b, &alen);
-		buffer_free(&b);
-	} else {
-		pkalg = packet_get_string(&alen);
-		pkblob = packet_get_string(&blen);
-	}
-	pktype = key_type_from_name(pkalg);
-	if (pktype == KEY_UNSPEC) {
-		/* this is perfectly legal */
-		log("userauth_pubkey: unsupported public key algorithm: %s", pkalg);
-		xfree(pkalg);
-		xfree(pkblob);
-		return 0;
-	}
-	key = key_from_blob(pkblob, blen);
-	if (key != NULL) {
-		if (have_sig) {
-			sig = packet_get_string(&slen);
-			packet_done();
-			buffer_init(&b);
-			if (datafellows & SSH_OLD_SESSIONID) {
-				buffer_append(&b, session_id2, session_id2_len);
-			} else {
-				buffer_put_string(&b, session_id2, session_id2_len);
-			}
-			/* reconstruct packet */
-			buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
-			buffer_put_cstring(&b, authctxt->user);
-			buffer_put_cstring(&b,
-			    datafellows & SSH_BUG_PKSERVICE ?
-			    "ssh-userauth" :
-			    authctxt->service);
-			if (datafellows & SSH_BUG_PKAUTH) {
-				buffer_put_char(&b, have_sig);
-			} else {
-				buffer_put_cstring(&b, "publickey");
-				buffer_put_char(&b, have_sig);
-				buffer_put_cstring(&b, key_ssh_name(key));
-			}
-			buffer_put_string(&b, pkblob, blen);
-#ifdef DEBUG_PK
-			buffer_dump(&b);
-#endif
-			/* test for correct signature */
-			if (user_key_allowed(authctxt->pw, key) &&
-			    key_verify(key, sig, slen, buffer_ptr(&b), buffer_len(&b)) == 1)
-				authenticated = 1;
-			buffer_clear(&b);
-			xfree(sig);
-		} else {
-			debug("test whether pkalg/pkblob are acceptable");
-			packet_done();
-
-			/* XXX fake reply and always send PK_OK ? */
-			/*
-			 * XXX this allows testing whether a user is allowed
-			 * to login: if you happen to have a valid pubkey this
-			 * message is sent. the message is NEVER sent at all
-			 * if a user is not allowed to login. is this an
-			 * issue? -markus
-			 */
-			if (user_key_allowed(authctxt->pw, key)) {
-				packet_start(SSH2_MSG_USERAUTH_PK_OK);
-				packet_put_string(pkalg, alen);
-				packet_put_string(pkblob, blen);
-				packet_send();
-				packet_write_wait();
-				authctxt->postponed = 1;
-			}
-		}
-		if (authenticated != 1)
-			auth_clear_options();
-		key_free(key);
-	}
-	debug2("userauth_pubkey: authenticated %d pkalg %s", authenticated, pkalg);
-	xfree(pkalg);
-	xfree(pkblob);
-#ifdef HAVE_CYGWIN
-	if (check_nt_auth(0, authctxt->pw->pw_uid) == 0)
-		return(0);
-#endif
-	return authenticated;
-}
-
 /* get current user */
 
 struct passwd*
@@ -525,168 +279,43 @@ auth_get_user(void)
 
 #define	DELIM	","
 
-char *
+static char *
 authmethods_get(void)
 {
-	Authmethod *method = NULL;
-	u_int size = 0;
+	Buffer b;
 	char *list;
+	int i;
 
-	for (method = authmethods; method->name != NULL; method++) {
-		if (strcmp(method->name, "none") == 0)
+	buffer_init(&b);
+	for (i = 0; authmethods[i] != NULL; i++) {
+		if (strcmp(authmethods[i]->name, "none") == 0)
 			continue;
-		if (method->enabled != NULL && *(method->enabled) != 0) {
-			if (size != 0)
-				size += strlen(DELIM);
-			size += strlen(method->name);
-		}
-	}
-	size++;			/* trailing '\0' */
-	list = xmalloc(size);
-	list[0] = '\0';
-
-	for (method = authmethods; method->name != NULL; method++) {
-		if (strcmp(method->name, "none") == 0)
-			continue;
-		if (method->enabled != NULL && *(method->enabled) != 0) {
-			if (list[0] != '\0')
-				strlcat(list, DELIM, size);
-			strlcat(list, method->name, size);
+		if (authmethods[i]->enabled != NULL &&
+		    *(authmethods[i]->enabled) != 0) {
+			if (buffer_len(&b) > 0)
+				buffer_append(&b, ",", 1);
+			buffer_append(&b, authmethods[i]->name,
+			    strlen(authmethods[i]->name));
 		}
 	}
+	buffer_append(&b, "\0", 1);
+	list = xstrdup(buffer_ptr(&b));
+	buffer_free(&b);
 	return list;
 }
 
-Authmethod *
+static Authmethod *
 authmethod_lookup(const char *name)
 {
-	Authmethod *method = NULL;
+	int i;
+
 	if (name != NULL)
-		for (method = authmethods; method->name != NULL; method++)
-			if (method->enabled != NULL &&
-			    *(method->enabled) != 0 &&
-			    strcmp(name, method->name) == 0)
-				return method;
-	debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
+		for (i = 0; authmethods[i] != NULL; i++)
+			if (authmethods[i]->enabled != NULL &&
+			    *(authmethods[i]->enabled) != 0 &&
+			    strcmp(name, authmethods[i]->name) == 0)
+				return authmethods[i];
+	debug2("Unrecognized authentication method name: %s",
+	    name ? name : "NULL");
 	return NULL;
 }
-
-/* return 1 if user allows given key */
-int
-user_key_allowed(struct passwd *pw, Key *key)
-{
-	char line[8192], file[MAXPATHLEN];
-	int found_key = 0;
-	FILE *f;
-	u_long linenum = 0;
-	struct stat st;
-	Key *found;
-
-	if (pw == NULL)
-		return 0;
-
-	/* Temporarily use the user's uid. */
-	temporarily_use_uid(pw->pw_uid);
-
-	/* The authorized keys. */
-	snprintf(file, sizeof file, "%.500s/%.100s", pw->pw_dir,
-	    _PATH_SSH_USER_PERMITTED_KEYS2);
-
-	/* Fail quietly if file does not exist */
-	if (stat(file, &st) < 0) {
-		/* Restore the privileged uid. */
-		restore_uid();
-		return 0;
-	}
-	/* Open the file containing the authorized keys. */
-	f = fopen(file, "r");
-	if (!f) {
-		/* Restore the privileged uid. */
-		restore_uid();
-		return 0;
-	}
-	if (options.strict_modes) {
-		int fail = 0;
-		char buf[1024];
-		/* Check open file in order to avoid open/stat races */
-		if (fstat(fileno(f), &st) < 0 ||
-		    (st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
-		    (st.st_mode & 022) != 0) {
-			snprintf(buf, sizeof buf,
-			    "%s authentication refused for %.100s: "
-			    "bad ownership or modes for '%s'.",
-			    key_type(key), pw->pw_name, file);
-			fail = 1;
-		} else {
-			/* Check path to _PATH_SSH_USER_PERMITTED_KEYS */
-			int i;
-			static const char *check[] = {
-				"", _PATH_SSH_USER_DIR, NULL
-			};
-			for (i = 0; check[i]; i++) {
-				snprintf(line, sizeof line, "%.500s/%.100s",
-				    pw->pw_dir, check[i]);
-				if (stat(line, &st) < 0 ||
-				    (st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
-				    (st.st_mode & 022) != 0) {
-					snprintf(buf, sizeof buf,
-					    "%s authentication refused for %.100s: "
-					    "bad ownership or modes for '%s'.",
-					    key_type(key), pw->pw_name, line);
-					fail = 1;
-					break;
-				}
-			}
-		}
-		if (fail) {
-			fclose(f);
-			log("%s",buf);
-			restore_uid();
-			return 0;
-		}
-	}
-	found_key = 0;
-	found = key_new(key->type);
-
-	while (fgets(line, sizeof(line), f)) {
-		char *cp, *options = NULL;
-		linenum++;
-		/* Skip leading whitespace, empty and comment lines. */
-		for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
-			;
-		if (!*cp || *cp == '\n' || *cp == '#')
-			continue;
-
-		if (key_read(found, &cp) == -1) {
-			/* no key?  check if there are options for this key */
-			int quoted = 0;
-			debug2("user_key_allowed: check options: '%s'", cp);
-			options = cp;
-			for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) {
-				if (*cp == '\\' && cp[1] == '"')
-					cp++;	/* Skip both */
-				else if (*cp == '"')
-					quoted = !quoted;
-			}
-			/* Skip remaining whitespace. */
-			for (; *cp == ' ' || *cp == '\t'; cp++)
-				;
-			if (key_read(found, &cp) == -1) {
-				debug2("user_key_allowed: advance: '%s'", cp);
-				/* still no key?  advance to next line*/
-				continue;
-			}
-		}
-		if (key_equal(found, key) &&
-		    auth_parse_options(pw, options, file, linenum) == 1) {
-			found_key = 1;
-			debug("matching key found: file %s, line %ld",
-			    file, linenum);
-			break;
-		}
-	}
-	restore_uid();
-	fclose(f);
-	key_free(found);
-	return found_key;
-}