journal-gatewayd: ask clients to provide certificates

A certificate authority certificate will be presented to clients,
causing them to present their client certificate, if it is signed by
this authority (default behaviour of most clients). No certificate
checking is actually performed.

diff --git a/src/journal/journal-gatewayd.c b/src/journal/journal-gatewayd.c
index 7e97a3588ce09abbd18befd4f094b05a6bec887e..862ee790308378a3b17aa8e94aae6429994d6d0a 100644 (file)
--- a/src/journal/journal-gatewayd.c
+++ b/src/journal/journal-gatewayd.c
@@ -900,8 +900,9 @@ static int help(void) {
                "HTTP server for journal events.\n\n"
                "  -h --help           Show this help\n"
                "     --version        Show package version\n"
-               "     --cert=CERT.PEM  Specify server certificate in PEM format\n"
-               "     --key=KEY.PEM    Specify server key in PEM format\n",
+               "     --cert=CERT.PEM  Server certificate in PEM format\n"
+               "     --key=KEY.PEM    Server key in PEM format\n"
+               "     --trust=CERT.PEM Certificat authority certificate in PEM format\n",
                program_invocation_short_name);
 
         return 0;
@@ -909,12 +910,14 @@ static int help(void) {
 
 static char *key_pem = NULL;
 static char *cert_pem = NULL;
+static char *trust_pem = NULL;
 
 static int parse_argv(int argc, char *argv[]) {
         enum {
                 ARG_VERSION = 0x100,
                 ARG_KEY,
                 ARG_CERT,
+                ARG_TRUST,
         };
 
         int r, c;
@@ -924,6 +927,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "version", no_argument,       NULL, ARG_VERSION },
                 { "key",     required_argument, NULL, ARG_KEY     },
                 { "cert",    required_argument, NULL, ARG_CERT    },
+                { "trust",   required_argument, NULL, ARG_TRUST   },
                 {}
         };
 
@@ -968,6 +972,19 @@ static int parse_argv(int argc, char *argv[]) {
                         assert(cert_pem);
                         break;
 
+                case ARG_TRUST:
+                        if (trust_pem) {
+                                log_error("CA certificate file specified twice");
+                                return -EINVAL;
+                        }
+                        r = read_full_file(optarg, &trust_pem, NULL);
+                        if (r < 0) {
+                                log_error("Failed to read CA certificate file: %s", strerror(-r));
+                                return r;
+                        }
+                        assert(trust_pem);
+                        break;
+
                 case '?':
                         return -EINVAL;
 
@@ -985,6 +1002,11 @@ static int parse_argv(int argc, char *argv[]) {
                 return -EINVAL;
         }
 
+        if (trust_pem && !key_pem) {
+                log_error("CA certificate can only be used with certificate file");
+                return -EINVAL;
+        }
+
         return 1;
 }
 
@@ -1018,6 +1040,7 @@ int main(int argc, char *argv[]) {
                         { MHD_OPTION_END, 0, NULL },
                         { MHD_OPTION_END, 0, NULL },
                         { MHD_OPTION_END, 0, NULL },
+                        { MHD_OPTION_END, 0, NULL },
                         { MHD_OPTION_END, 0, NULL }};
                 int opts_pos = 2;
                 int flags = MHD_USE_THREAD_PER_CONNECTION|MHD_USE_POLL|MHD_USE_DEBUG;
@@ -1033,6 +1056,11 @@ int main(int argc, char *argv[]) {
                                 {MHD_OPTION_HTTPS_MEM_CERT, 0, cert_pem};
                         flags |= MHD_USE_SSL;
                 }
+                if (trust_pem) {
+                        assert(flags & MHD_USE_SSL);
+                        opts[opts_pos++] = (struct MHD_OptionItem)
+                                {MHD_OPTION_HTTPS_MEM_TRUST, 0, trust_pem};
+                }
 
                 d = MHD_start_daemon(flags, 19531,
                                      NULL, NULL,