upstream: fix regression introduced when I switched the "Match"

criteria tokeniser to a more shell-like one. Apparently the old tokeniser
(accidentally?) allowed "Match criteria=argument" as well as the "Match
criteria argument" syntax that we tested for.

People were using this syntax so this adds back support for
"Match criteria=argument"

bz3739 ok dtucker

OpenBSD-Commit-ID: d1eebedb8c902002b75b75debfe1eeea1801f58a

4 files changed, 89 insertions, 22 deletions

diff --git a/misc.c b/misc.c
index afdf5142e..1b4b55c50 100644
--- a/misc.c
+++ b/misc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: misc.c,v 1.196 2024/06/06 17:15:25 djm Exp $ */
+/* $OpenBSD: misc.c,v 1.197 2024/09/25 01:24:04 djm Exp $ */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  * Copyright (c) 2005-2020 Damien Miller.  All rights reserved.
@@ -107,6 +107,27 @@ rtrim(char *s)
 	}
 }
 
+/*
+ * returns pointer to character after 'prefix' in 's' or otherwise NULL
+ * if the prefix is not present.
+ */
+const char *
+strprefix(const char *s, const char *prefix, int ignorecase)
+{
+	size_t prefixlen;
+
+	if ((prefixlen = strlen(prefix)) == 0)
+		return s;
+	if (ignorecase) {
+		if (strncasecmp(s, prefix, prefixlen) != 0)
+			return NULL;
+	} else {
+		if (strncmp(s, prefix, prefixlen) != 0)
+			return NULL;
+	}
+	return s + prefixlen;
+}
+
 /* set/unset filedescriptor to non-blocking */
 int
 set_nonblock(int fd)
diff --git a/misc.h b/misc.h
index 113403896..efecdf1ad 100644
--- a/misc.h
+++ b/misc.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: misc.h,v 1.109 2024/06/06 17:15:25 djm Exp $ */
+/* $OpenBSD: misc.h,v 1.110 2024/09/25 01:24:04 djm Exp $ */
 
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -56,6 +56,7 @@ struct ForwardOptions {
 char	*chop(char *);
 void	 rtrim(char *);
 void	skip_space(char **);
+const char *strprefix(const char *, const char *, int);
 char	*strdelim(char **);
 char	*strdelimw(char **);
 int	 set_nonblock(int);
diff --git a/readconf.c b/readconf.c
index 3d9cc6dbb..de42fb6ff 100644
--- a/readconf.c
+++ b/readconf.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: readconf.c,v 1.390 2024/09/15 00:57:36 djm Exp $ */
+/* $OpenBSD: readconf.c,v 1.391 2024/09/25 01:24:04 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -710,7 +710,7 @@ match_cfg_line(Options *options, const char *full_line, int *acp, char ***avp,
     struct passwd *pw, const char *host_arg, const char *original_host,
     int final_pass, int *want_final_pass, const char *filename, int linenum)
 {
-	char *arg, *oattrib, *attrib, *cmd, *host, *criteria;
+	char *arg, *oattrib, *attrib = NULL, *cmd, *host, *criteria;
 	const char *ruser;
 	int r, this_result, result = 1, attributes = 0, negate;
 
@@ -731,7 +731,8 @@ match_cfg_line(Options *options, const char *full_line, int *acp, char ***avp,
 
 	debug2("checking match for '%s' host %s originally %s",
 	    full_line, host, original_host);
-	while ((oattrib = attrib = argv_next(acp, avp)) != NULL) {
+	while ((oattrib = argv_next(acp, avp)) != NULL) {
+		attrib = xstrdup(oattrib);
 		/* Terminate on comment */
 		if (*attrib == '#') {
 			argv_consume(acp);
@@ -777,9 +778,23 @@ match_cfg_line(Options *options, const char *full_line, int *acp, char ***avp,
 			    this_result ? "" : "not ", oattrib);
 			continue;
 		}
+
+		/* Keep this list in sync with below */
+		if (strprefix(attrib, "host=", 1)  != NULL ||
+		    strprefix(attrib, "originalhost=", 1) != NULL ||
+		    strprefix(attrib, "user=", 1) != NULL ||
+		    strprefix(attrib, "localuser=", 1) != NULL ||
+		    strprefix(attrib, "localnetwork=", 1) != NULL ||
+		    strprefix(attrib, "tagged=", 1) != NULL ||
+		    strprefix(attrib, "exec=", 1) != NULL) {
+			arg = strchr(attrib, '=');
+			*(arg++) = '\0';
+		} else {
+			arg = argv_next(acp, avp);
+		}
+
 		/* All other criteria require an argument */
-		if ((arg = argv_next(acp, avp)) == NULL ||
-		    *arg == '\0' || *arg == '#') {
+		if (arg == NULL || *arg == '\0' || *arg == '#') {
 			error("Missing Match criteria for %s", attrib);
 			result = -1;
 			goto out;
@@ -856,6 +871,8 @@ match_cfg_line(Options *options, const char *full_line, int *acp, char ***avp,
 		    criteria == NULL ? "" : criteria,
 		    criteria == NULL ? "" : "\"");
 		free(criteria);
+		free(attrib);
+		attrib = NULL;
 	}
 	if (attributes == 0) {
 		error("One or more attributes required for Match");
@@ -865,6 +882,7 @@ match_cfg_line(Options *options, const char *full_line, int *acp, char ***avp,
  out:
 	if (result != -1)
 		debug2("match %sfound", result ? "" : "not ");
+	free(attrib);
 	free(host);
 	return result;
 }
diff --git a/servconf.c b/servconf.c
index 89b8413e8..dd774f468 100644
--- a/servconf.c
+++ b/servconf.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: servconf.c,v 1.418 2024/09/15 03:09:44 djm Exp $ */
+/* $OpenBSD: servconf.c,v 1.419 2024/09/25 01:24:04 djm Exp $ */
 /*
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
  *                    All rights reserved
@@ -1033,7 +1033,7 @@ match_cfg_line(const char *full_line, int *acp, char ***avp,
     int line, struct connection_info *ci)
 {
 	int result = 1, attributes = 0, port;
-	char *arg, *attrib;
+	char *arg, *attrib = NULL, *oattrib;
 
 	if (ci == NULL)
 		debug3("checking syntax for 'Match %s'", full_line);
@@ -1047,7 +1047,8 @@ match_cfg_line(const char *full_line, int *acp, char ***avp,
 		    ci->laddress ? ci->laddress : "(null)", ci->lport);
 	}
 
-	while ((attrib = argv_next(acp, avp)) != NULL) {
+	while ((oattrib = argv_next(acp, avp)) != NULL) {
+		attrib = xstrdup(oattrib);
 		/* Terminate on comment */
 		if (*attrib == '#') {
 			argv_consume(acp); /* mark all arguments consumed */
@@ -1062,11 +1063,13 @@ match_cfg_line(const char *full_line, int *acp, char ***avp,
 			    *arg != '\0' && *arg != '#')) {
 				error("'all' cannot be combined with other "
 				    "Match attributes");
-				return -1;
+				result = -1;
+				goto out;
 			}
 			if (arg != NULL && *arg == '#')
 				argv_consume(acp); /* consume remaining args */
-			return 1;
+			result = 1;
+			goto out;
 		}
 		/* Criterion "invalid-user" also has no argument */
 		if (strcasecmp(attrib, "invalid-user") == 0) {
@@ -1078,11 +1081,26 @@ match_cfg_line(const char *full_line, int *acp, char ***avp,
 				debug("matched invalid-user at line %d", line);
 			continue;
 		}
+
+		/* Keep this list in sync with below */
+		if (strprefix(attrib, "user=", 1) != NULL ||
+		    strprefix(attrib, "group=", 1) != NULL ||
+		    strprefix(attrib, "host=", 1) != NULL ||
+		    strprefix(attrib, "address=", 1) != NULL ||
+		    strprefix(attrib, "localaddress=", 1) != NULL ||
+		    strprefix(attrib, "localport=", 1) != NULL ||
+		    strprefix(attrib, "rdomain=", 1) != NULL) {
+			arg = strchr(attrib, '=');
+			*(arg++) = '\0';
+		} else {
+			arg = argv_next(acp, avp);
+		}
+
 		/* All other criteria require an argument */
-		if ((arg = argv_next(acp, avp)) == NULL ||
-		    *arg == '\0' || *arg == '#') {
+		if (arg == NULL || *arg == '\0' || *arg == '#') {
 			error("Missing Match criteria for %s", attrib);
-			return -1;
+			result = -1;
+			goto out;
 		}
 		if (strcasecmp(attrib, "user") == 0) {
 			if (ci == NULL || (ci->test && ci->user == NULL)) {
@@ -1105,7 +1123,8 @@ match_cfg_line(const char *full_line, int *acp, char ***avp,
 				match_test_missing_fatal("Group", "user");
 			switch (match_cfg_line_group(arg, line, ci->user)) {
 			case -1:
-				return -1;
+				result = -1;
+				goto out;
 			case 0:
 				result = 0;
 			}
@@ -1141,7 +1160,8 @@ match_cfg_line(const char *full_line, int *acp, char ***avp,
 				result = 0;
 				break;
 			case -2:
-				return -1;
+				result = -1;
+				goto out;
 			}
 		} else if (strcasecmp(attrib, "localaddress") == 0){
 			if (ci == NULL || (ci->test && ci->laddress == NULL)) {
@@ -1166,13 +1186,15 @@ match_cfg_line(const char *full_line, int *acp, char ***avp,
 				result = 0;
 				break;
 			case -2:
-				return -1;
+				result = -1;
+				goto out;
 			}
 		} else if (strcasecmp(attrib, "localport") == 0) {
 			if ((port = a2port(arg)) == -1) {
 				error("Invalid LocalPort '%s' on Match line",
 				    arg);
-				return -1;
+				result = -1;
+				goto out;
 			}
 			if (ci == NULL || (ci->test && ci->lport == -1)) {
 				result = 0;
@@ -1200,16 +1222,21 @@ match_cfg_line(const char *full_line, int *acp, char ***avp,
 				debug("user %.100s matched 'RDomain %.100s' at "
 				    "line %d", ci->rdomain, arg, line);
 		} else {
-			error("Unsupported Match attribute %s", attrib);
-			return -1;
+			error("Unsupported Match attribute %s", oattrib);
+			result = -1;
+			goto out;
 		}
+		free(attrib);
+		attrib = NULL;
 	}
 	if (attributes == 0) {
 		error("One or more attributes required for Match");
 		return -1;
 	}
-	if (ci != NULL)
+ out:
+	if (ci != NULL && result != -1)
 		debug3("match %sfound", result ? "" : "not ");
+	free(attrib);
 	return result;
 }