[OpenWrt-Devel] [PATCH v2] uhttpd: add support for mutual authentication (mTLS)

[Nuno Morais]

From: Nuno Morais <Nuno.mcvmorais at gmail.com>

Fix tabs vs spaces
Add new optional argument to function header
to add CA_certificate to avoid replicated code

This patch depends on patch
"[OpenWrt-Devel] [PATCH] ustream-ssl: add optional mutual authentication (mTLS)"

Signed-off-by: Nuno Morais <nuno.mcvmorais at gmail.com>
Co-Developed-by: Jose Vieira <josecarlosvieir at hotmail.com>
---
 main.c | 18 ++++++++++++++----
 tls.c  | 20 ++++++++++++++++----
 tls.h  |  4 ++--
 3 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/main.c b/main.c
index 219e37e..ec9da85 100644
--- a/main.c
+++ b/main.c
@@ -139,6 +139,7 @@ static int usage(const char *name)
 		"	-s [addr:]port  Like -p but provide HTTPS on this port\n"
 		"	-C file         ASN.1 server certificate file\n"
 		"	-K file         ASN.1 server private key file\n"
+		"	-M file         ASN.1 certificate authority certificate file\n"
 		"	-q              Redirect all HTTP requests to HTTPS\n"
 #endif
 		"	-h directory    Specify the document root, default is '.'\n"
@@ -246,7 +247,8 @@ int main(int argc, char **argv)
 	int bound = 0;
 #ifdef HAVE_TLS
 	int n_tls = 0;
-	const char *tls_key = NULL, *tls_crt = NULL;
+	int n_mtls = 0;
+	const char *tls_key = NULL, *tls_crt = NULL, *ca_crt = NULL;
 #endif
 #ifdef HAVE_LUA
 	const char *lua_prefix = NULL, *lua_handler = NULL;
@@ -258,7 +260,7 @@ int main(int argc, char **argv)
 	init_defaults_pre();
 	signal(SIGPIPE, SIG_IGN);
 
-	while ((ch = getopt(argc, argv, "A:aC:c:Dd:E:fh:H:I:i:K:k:L:l:m:N:n:p:qRr:Ss:T:t:U:u:Xx:y:")) != -1) {
+	while ((ch = getopt(argc, argv, "A:aC:c:Dd:E:fh:H:I:i:K:k:L:l:M:m:N:n:p:qRr:Ss:T:t:U:u:Xx:y:")) != -1) {
 		switch(ch) {
 #ifdef HAVE_TLS
 		case 'C':
@@ -269,6 +271,11 @@ int main(int argc, char **argv)
 			tls_key = optarg;
 			break;
 
+		case 'M':
+			ca_crt = optarg;
+			n_mtls++;
+			break;
+
 		case 'q':
 			conf.tls_redirect = 1;
 			break;
@@ -520,8 +527,11 @@ int main(int argc, char **argv)
 			return 1;
 		}
 
-		if (uh_tls_init(tls_key, tls_crt))
-		    return 1;
+		if (n_mtls){
+			if (uh_tls_init(tls_key, tls_crt, ca_crt))
+				return 1;
+		} else if (uh_tls_init(tls_key, tls_crt, '\0'))
+				return 1;
 	}
 #endif
 
diff --git a/tls.c b/tls.c
index d969b82..1b1ba52 100644
--- a/tls.c
+++ b/tls.c
@@ -31,9 +31,16 @@ static struct ustream_ssl_ops *ops;
 static void *dlh;
 static void *ctx;
 
-int uh_tls_init(const char *key, const char *crt)
+int uh_tls_init(const char *key, const char *crt, ...)
 {
 	static bool _init = false;
+	const char *srv_crt, *ca_crt;
+	va_list arg;
+
+	va_start(arg, crt);
+	srv_crt = crt;
+	ca_crt = va_arg(arg, const char *);
+	va_end(arg);
 
 	if (_init)
 		return 0;
@@ -57,10 +64,15 @@ int uh_tls_init(const char *key, const char *crt)
 		return -EINVAL;
 	}
 
-	if (ops->context_set_crt_file(ctx, crt) ||
-	    ops->context_set_key_file(ctx, key)) {
+	if (ops->context_set_crt_file(ctx, srv_crt) ||
+		ops->context_set_key_file(ctx, key)) {
 		fprintf(stderr, "Failed to load certificate/key files\n");
-		return -EINVAL;
+	}
+
+	if(ca_crt){
+		if(ops->context_add_ca_crt_file(ctx, ca_crt))
+			return -EINVAL;
+		else ops->context_set_mutual_auth(ctx, 1);
 	}
 
 	return 0;
diff --git a/tls.h b/tls.h
index 9be74ba..7e437dd 100644
--- a/tls.h
+++ b/tls.h
@@ -22,13 +22,13 @@
 
 #ifdef HAVE_TLS
 
-int uh_tls_init(const char *key, const char *crt);
+int uh_tls_init(const char *key, const char *crt, ...);
 void uh_tls_client_attach(struct client *cl);
 void uh_tls_client_detach(struct client *cl);
 
 #else
 
-static inline int uh_tls_init(const char *key, const char *crt)
+static inline int uh_tls_init(const char *key, const char *crt, ...)
 {
 	return -1;
 }
-- 
2.18.0


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