upstream: adapt sk-dummy to SK API changes

also, make it pull prototypes directly from sk-api.c and #error
if the expected version changes. This will make any future regress
test breakage because of SK API changes much more apparent

OpenBSD-Regress-ID: 79b07055de4feb988e31da71a89051ad5969829d

1 files changed, 40 insertions, 71 deletions

diff --git a/regress/misc/sk-dummy/sk-dummy.c b/regress/misc/sk-dummy/sk-dummy.c
index e8052410d..a7e93982c 100644
--- a/regress/misc/sk-dummy/sk-dummy.c
+++ b/regress/misc/sk-dummy/sk-dummy.c
@@ -24,6 +24,7 @@
 #include <stdarg.h>
 
 #include "crypto_api.h"
+#include "sk-api.h"
 
 #include <openssl/opensslv.h>
 #include <openssl/crypto.h>
@@ -44,63 +45,9 @@
         } while (0)
 #endif
 
-#define SK_VERSION_MAJOR        0x00030000 /* current API version */
-
-/* Flags */
-#define SK_USER_PRESENCE_REQD   0x01
-
-/* Algs */
-#define SK_ECDSA                0x00
-#define SK_ED25519              0x01
-
-/* Error codes */
-#define SSH_SK_ERR_GENERAL              -1
-#define SSH_SK_ERR_UNSUPPORTED          -2
-#define SSH_SK_ERR_PIN_REQUIRED         -3
-
-struct sk_enroll_response {
-        uint8_t *public_key;
-        size_t public_key_len;
-        uint8_t *key_handle;
-        size_t key_handle_len;
-        uint8_t *signature;
-        size_t signature_len;
-        uint8_t *attestation_cert;
-        size_t attestation_cert_len;
-};
-
-struct sk_sign_response {
-        uint8_t flags;
-        uint32_t counter;
-        uint8_t *sig_r;
-        size_t sig_r_len;
-        uint8_t *sig_s;
-        size_t sig_s_len;
-};
-
-struct sk_resident_key {
-        uint8_t alg;
-        size_t slot;
-        char *application;
-        struct sk_enroll_response key;
-};
-
-/* Return the version of the middleware API */
-uint32_t sk_api_version(void);
-
-/* Enroll a U2F key (private key generation) */
-int sk_enroll(int alg, const uint8_t *challenge, size_t challenge_len,
-    const char *application, uint8_t flags, const char *pin,
-    struct sk_enroll_response **enroll_response);
-
-/* Sign a challenge */
-int sk_sign(int alg, const uint8_t *message, size_t message_len,
-    const char *application, const uint8_t *key_handle, size_t key_handle_len,
-    uint8_t flags, const char *pin, struct sk_sign_response **sign_response);
-
-/* Enumerate all resident keys */
-int sk_load_resident_keys(const char *pin,
-    struct sk_resident_key ***rks, size_t *nrks);
+#if SSH_SK_VERSION_MAJOR != 0x00040000
+# error SK API has changed, sk-dummy.c needs an update
+#endif
 
 static void skdebug(const char *func, const char *fmt, ...)
     __attribute__((__format__ (printf, 2, 3)));
@@ -125,7 +72,7 @@ skdebug(const char *func, const char *fmt, ...)
 uint32_t
 sk_api_version(void)
 {
-        return SK_VERSION_MAJOR;
+        return SSH_SK_VERSION_MAJOR;
 }
 
 static int
@@ -253,13 +200,31 @@ pack_key_ed25519(struct sk_enroll_response *response)
         return ret;
 }
 
+static int
+check_options(struct sk_option **options)
+{
+        size_t i;
+
+        if (options == NULL)
+                return 0;
+        for (i = 0; options[i] != NULL; i++) {
+                skdebug(__func__, "requested unsupported option %s",
+                    options[i]->name);
+                if (options[i]->required) {
+                        skdebug(__func__, "unknown required option");
+                        return -1;
+                }
+        }
+        return 0;
+}
+
 int
-sk_enroll(int alg, const uint8_t *challenge, size_t challenge_len,
+sk_enroll(uint32_t alg, const uint8_t *challenge, size_t challenge_len,
     const char *application, uint8_t flags, const char *pin,
-    struct sk_enroll_response **enroll_response)
+    struct sk_option **options, struct sk_enroll_response **enroll_response)
 {
         struct sk_enroll_response *response = NULL;
-        int ret = -1;
+        int ret = SSH_SK_ERR_GENERAL;
 
         (void)flags; /* XXX; unused */
 
@@ -268,16 +233,18 @@ sk_enroll(int alg, const uint8_t *challenge, size_t challenge_len,
                 goto out;
         }
         *enroll_response = NULL;
+        if (check_options(options) != 0)
+                goto out; /* error already logged */
         if ((response = calloc(1, sizeof(*response))) == NULL) {
                 skdebug(__func__, "calloc response failed");
                 goto out;
         }
         switch(alg) {
-        case SK_ECDSA:
+        case SSH_SK_ECDSA:
                 if (pack_key_ecdsa(response) != 0)
                         goto out;
                 break;
-        case SK_ED25519:
+        case SSH_SK_ED25519:
                 if (pack_key_ed25519(response) != 0)
                         goto out;
                 break;
@@ -499,19 +466,21 @@ sig_ed25519(const uint8_t *message, size_t message_len,
 }
 
 int
-sk_sign(int alg, const uint8_t *message, size_t message_len,
-    const char *application,
-    const uint8_t *key_handle, size_t key_handle_len,
-    uint8_t flags, const char *pin, struct sk_sign_response **sign_response)
+sk_sign(uint32_t alg, const uint8_t *message, size_t message_len,
+    const char *application, const uint8_t *key_handle, size_t key_handle_len,
+    uint8_t flags, const char *pin, struct sk_option **options,
+    struct sk_sign_response **sign_response)
 {
         struct sk_sign_response *response = NULL;
-        int ret = -1;
+        int ret = SSH_SK_ERR_GENERAL;
 
         if (sign_response == NULL) {
                 skdebug(__func__, "sign_response == NULL");
                 goto out;
         }
         *sign_response = NULL;
+        if (check_options(options) != 0)
+                goto out; /* error already logged */
         if ((response = calloc(1, sizeof(*response))) == NULL) {
                 skdebug(__func__, "calloc response failed");
                 goto out;
@@ -519,13 +488,13 @@ sk_sign(int alg, const uint8_t *message, size_t message_len,
         response->flags = flags;
         response->counter = 0x12345678;
         switch(alg) {
-        case SK_ECDSA:
+        case SSH_SK_ECDSA:
                 if (sig_ecdsa(message, message_len, application,
                     response->counter, flags, key_handle, key_handle_len,
                     response) != 0)
                         goto out;
                 break;
-        case SK_ED25519:
+        case SSH_SK_ED25519:
                 if (sig_ed25519(message, message_len, application,
                     response->counter, flags, key_handle, key_handle_len,
                     response) != 0)
@@ -548,7 +517,7 @@ sk_sign(int alg, const uint8_t *message, size_t message_len,
 }
 
 int
-sk_load_resident_keys(const char *pin,
+sk_load_resident_keys(const char *pin, struct sk_option **options,
     struct sk_resident_key ***rks, size_t *nrks)
 {
         return SSH_SK_ERR_UNSUPPORTED;