Add EC certificate issuer key type detection for sbearssl

3 files changed, 53 insertions, 1 deletions

diff --git a/src/sbearssl/deps-lib/sbearssl b/src/sbearssl/deps-lib/sbearssl
index bace1a7..0b7b02f 100644
--- a/src/sbearssl/deps-lib/sbearssl
+++ b/src/sbearssl/deps-lib/sbearssl
@@ -2,6 +2,7 @@ sbearssl_append.o
 sbearssl_cert_from.o
 sbearssl_cert_readfile.o
 sbearssl_cert_to.o
+sbearssl_ec_issuer_keytype.o
 sbearssl_ec_pkey_from.o
 sbearssl_ec_pkey_to.o
 sbearssl_ec_skey_from.o
diff --git a/src/sbearssl/sbearssl_ec_issuer_keytype.c b/src/sbearssl/sbearssl_ec_issuer_keytype.c
new file mode 100644
index 0000000..2958e8d
--- /dev/null
+++ b/src/sbearssl/sbearssl_ec_issuer_keytype.c
@@ -0,0 +1,40 @@
+/* ISC license. */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <bearssl.h>
+#include <skalibs/stralloc.h>
+#include <s6-networking/sbearssl.h>
+#include "sbearssl-internal.h"
+
+int sbearssl_ec_issuer_keytype (int *kt, br_x509_certificate const *cert)
+{
+  br_x509_decoder_context ctx ;
+  stralloc sa = STRALLOC_ZERO ;
+  struct sbearssl_strallocerr_s blah = { .sa = &sa } ;
+  int r = -1 ;
+
+  br_x509_decoder_init(&ctx, &sbearssl_append, &blah) ;
+  br_x509_decoder_push(&ctx, cert->data, cert->data_len) ;
+  if (blah.err)
+  {
+    errno = blah.err ;
+    goto fail ;
+  }
+  r = br_x509_decoder_last_error(&ctx) ;
+  if (r) goto fail ;
+  r = br_x509_decoder_get_signer_key_type(&ctx) ;
+  if (!r)
+  {
+    r = -2 ;
+    goto fail ;
+  }
+
+  stralloc_free(&sa) ;
+  *kt = r ;
+  return 0 ;
+
+ fail:
+  stralloc_free(&sa) ;
+  return r ;
+}
diff --git a/src/sbearssl/sbearssl_s6tlsd.c b/src/sbearssl/sbearssl_s6tlsd.c
index 1198349..35dd18a 100644
--- a/src/sbearssl/sbearssl_s6tlsd.c
+++ b/src/sbearssl/sbearssl_s6tlsd.c
@@ -66,9 +66,20 @@ int sbearssl_s6tlsd (char const *const *argv, char const *const *envp, tain_t co
         br_ssl_server_init_full_rsa(&sc, chain, chainlen, &key.rsa) ;
         break ;
       case BR_KEYTYPE_EC :
+      {
+        int kt, r ;
         sbearssl_ec_skey_to(&skey.data.ec, &key.ec, storage.s) ;
-        br_ssl_server_init_full_ec(&sc, chain, chainlen, BR_KEYTYPE_EC, &key.ec) ;
+        r = sbearssl_ec_issuer_keytype(&kt, &chain[0]) ;
+        switch (r)
+        {
+          case -2 : strerr_dief1x(96, "certificate issuer key type not recognized") ;
+          case -1 : strerr_diefu1sys(111, "get certificate issuer key type") ;
+          case 0 : break ;
+          default : strerr_diefu3x(96, "get certificate issuer key type", ": ", sbearssl_error_str(r)) ;
+        }
+        br_ssl_server_init_full_ec(&sc, chain, chainlen, kt, &key.ec) ;
         break ;
+      }
       default :
       strerr_dief1x(96, "unsupported private key type") ;
     }