X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=secnet.h;h=30a171d4da262160443b9029c1c137fe8f69e027;hb=8cfbee0801e9af50be31656a42c30060aadee1a0;hp=dd5650d03f98c6451aaa3335e611ef700b3580b5;hpb=dafb749b7f5f0cd26093062da4ec547458f2d029;p=secnet.git

diff --git a/secnet.h b/secnet.h
index dd5650d..30a171d 100644
--- a/secnet.h
+++ b/secnet.h
@@ -45,15 +45,22 @@
 
 #include <bsd/sys/queue.h>
 
+#include "osdep.h"
+
 #define MAX_PEER_ADDRS 5
 /* send at most this many copies; honour at most that many addresses */
 
 #define MAX_NAK_MSG 80
+#define MAX_SIG_KEYS 4
 
 struct hash_if;
 struct comm_if;
 struct comm_addr;
 struct priomsg;
+struct log_if;
+struct buffer_if;
+struct sigpubkey_if;
+struct sigprivkey_if;
 
 typedef char *string_t;
 typedef const char *cstring_t;
@@ -86,6 +93,15 @@ static inline bool_t sigkeyid_equal(const struct sigkeyid *a,
     return !memcmp(a->b, b->b, KEYIDSZ);
 }
 
+#define SERIALSZ 4
+typedef uint32_t serialt;
+static inline int serial_cmp(serialt a, serialt b) {
+    if (a==b) return 0;
+    if (!a) return -1;
+    if (!b) return +1;
+    return b-a <= (serialt)0x7fffffffUL ? +1 : -1;
+}
+
 #define ASSERT(x) do { if (!(x)) { fatal("assertion failed line %d file " \
 					 __FILE__,__LINE__); } } while(0)
 
@@ -377,9 +393,51 @@ extern init_module slip_module;
 extern init_module tun_module;
 extern init_module sha1_module;
 extern init_module log_module;
+extern init_module privcache_module;
 
 /***** END of module support *****/
 
+/***** SIGNATURE SCHEMES *****/
+
+struct sigscheme_info;
+
+typedef bool_t sigscheme_loadpub(const struct sigscheme_info *algo,
+				 struct buffer_if *pubkeydata,
+				 struct sigpubkey_if **sigpub_r,
+				 struct log_if *log, struct cloc loc);
+  /* pubkeydata is (supposedly) for this algorithm.
+   * loadpub should log an error if it fails.
+   * pubkeydata may be modified (but not freed) */
+
+typedef bool_t sigscheme_loadpriv(const struct sigscheme_info *algo,
+				  struct buffer_if *privkeydata,
+				  struct sigprivkey_if **sigpriv_r,
+				  struct log_if *log, struct cloc loc);
+  /* Ideally, check whether privkeydata contains data for any algorithm.
+   * That avoids security problems if a key file is misidentified (which
+   * might happen if the file is simply renamed).
+   * If there is an error (including that the key data is not for this
+   * algorithm, return False and log an error at M_ERROR.
+   * On entry privkeydata->base==start.  loadpriv may modify
+   * privkeydata, including the contents. */
+
+struct sigscheme_info {
+    const char *name;
+    const uint8_t algid;
+    sigscheme_loadpub *loadpub;
+    sigscheme_loadpriv *loadpriv;
+};
+
+extern const struct sigscheme_info rsa1_sigscheme;
+extern const struct sigscheme_info sigschemes[]; /* sentinel has name==0 */
+
+const struct sigscheme_info *sigscheme_lookup(const char *name);
+
+extern sigscheme_loadpriv rsa1_loadpriv;
+extern sigscheme_loadpub  rsa1_loadpub;
+
+/***** END of signature schemes *****/
+
 /***** CLOSURE TYPES and interface definitions *****/
 
 #define CL_PURE         0
@@ -396,6 +454,7 @@ extern init_module log_module;
 #define CL_HASH        12
 #define CL_BUFFER      13
 #define CL_NETLINK     14
+#define CL_PRIVCACHE   15
 
 struct buffer_if;
 
@@ -441,15 +500,19 @@ struct random_if {
 /* SIGPUBKEY interface */
 
 typedef void sig_sethash_fn(void *st, struct hash_if *hash);
+typedef void sig_dispose_fn(void *st);
+
 typedef bool_t sig_unpick_fn(void *sst, struct buffer_if *msg,
 			     struct alg_msg_data *sig);
 typedef bool_t sig_checksig_fn(void *st, uint8_t *data, int32_t datalen,
 			       const struct alg_msg_data *sig);
 struct sigpubkey_if {
     void *st;
-    sig_sethash_fn *sethash; /* must be called before check, if non-0 */
+    sig_sethash_fn *sethash; /* must be called before use, if non-0 */
     sig_unpick_fn *unpick;
     sig_checksig_fn *check;
+    const struct hash_if *hash;
+    sig_dispose_fn *dispose;
 };
 
 /* SIGPRIVKEY interface */
@@ -460,8 +523,23 @@ typedef bool_t sig_makesig_fn(void *st, uint8_t *data, int32_t datalen,
 			      struct buffer_if *msg);
 struct sigprivkey_if {
     void *st;
-    sig_sethash_fn *sethash; /* must be called before sign, if non-0 */
+    sig_sethash_fn *sethash; /* must be called before use, if non-0 */
     sig_makesig_fn *sign;
+    const struct hash_if *hash;
+    sig_dispose_fn *dispose;
+};
+
+/* PRIVCACHE interface */
+
+typedef struct sigprivkey_if *privcache_lookup_fn(void *st,
+					   const struct sigkeyid *id,
+					   struct log_if*);
+  /* Return is valid only until you return from the current event!
+   * You do not need to call ->sethash. */
+
+struct privcache_if {
+    void *st;
+    privcache_lookup_fn *lookup;
 };
 
 /* COMM interface */