X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=rsa.c;h=efcb650fc216c3a2965b2bb45d0b85e3158478f3;hb=564022994befb8f71b89ae015751b22c34ae3ee8;hp=78dfb99d6d79cbc1d08ec06fd752c28b10b9cc9d;hpb=7bc98088613be17894eba5313bb953244c48d458;p=secnet.git

diff --git a/rsa.c b/rsa.c
index 78dfb99..efcb650 100644
--- a/rsa.c
+++ b/rsa.c
@@ -49,10 +49,11 @@ struct rsacommon {
 
 struct load_ctx {
     void (*verror)(struct load_ctx *l, struct cloc loc,
-		   FILE *maybe_f, bool_t unsup,
+		   FILE *maybe_f,
 		   const char *message, va_list args);
     bool_t (*postreadcheck)(struct load_ctx *l, FILE *f);
     const char *what;
+    dict_t *deprdict; /* used only to look up hash */
     struct cloc loc;
     union {
 	struct {
@@ -63,29 +64,29 @@ struct load_ctx {
 
 static void load_err(struct load_ctx *l,
 		     const struct cloc *maybe_loc, FILE *maybe_f,
-		     bool_t unsup, const char *fmt, ...)
+		     const char *fmt, ...)
 {
     va_list al;
     va_start(al,fmt);
-    l->verror(l, maybe_loc ? *maybe_loc : l->loc, maybe_f,unsup,fmt,al);
+    l->verror(l, maybe_loc ? *maybe_loc : l->loc, maybe_f,fmt,al);
     va_end(al);
 }
 
-FORMAT(printf,5,0)
+FORMAT(printf,4,0)
 static void verror_tryload(struct load_ctx *l, struct cloc loc,
-			   FILE *maybe_f, bool_t unsup,
+			   FILE *maybe_f,
 			   const char *message, va_list args)
 {
-    int class=unsup ? M_DEBUG : M_ERR;
+    int class=M_ERR;
     slilog_part(l->u.tryload.log,class,"%s: ",l->what);
     vslilog(l->u.tryload.log,class,message,args);
 }
 
 static void verror_cfgfatal(struct load_ctx *l, struct cloc loc,
-			    FILE *maybe_f, bool_t unsup,
+			    FILE *maybe_f,
 			    const char *message, va_list args)
 {
-    vcfgfatal_maybefile(maybe_f,l->loc,l->what,message,args);
+    vcfgfatal_maybefile(maybe_f,l->loc,l->what,message,args,"");
 }
 
 struct rsapriv {
@@ -127,23 +128,19 @@ struct rsapub {
 
 static const char *hexchars="0123456789abcdef";
 
-static void rsa_sethash(struct rsacommon *c, struct hash_if *hash,
+static void rsa_sethash(struct load_ctx *l,
+			struct rsacommon *c,
 			const struct hash_if **in_ops)
 {
-    free(c->hashbuf);
+    struct hash_if *hash=0;
+    if (l->deprdict)
+	hash=find_cl_if(l->deprdict,"hash",CL_HASH,False,"site",l->loc);
+    if (!hash)
+	hash=sha1_hash_if;
     c->hashbuf=safe_malloc(hash->hlen, "generate_msg");
     *in_ops=hash;
 }
-static void rsa_pub_sethash(void *sst, struct hash_if *hash)
-{
-    struct rsapub *st=sst;
-    rsa_sethash(&st->common, hash, &st->ops.hash);
-}
-static void rsa_priv_sethash(void *sst, struct hash_if *hash)
-{
-    struct rsapriv *st=sst;
-    rsa_sethash(&st->common, hash, &st->ops.hash);
-}
+
 static void rsacommon_dispose(struct rsacommon *c)
 {
     free(c->hashbuf);
@@ -329,7 +326,7 @@ static void rsapub_dispose(void *sst) {
     const char *en##s, struct cloc en##_loc,
 
 #define LDPUBFATAL(lc,...) ({			\
-	load_err(l,(lc),0,0,__VA_ARGS__);	\
+	load_err(l,(lc),0,__VA_ARGS__);	\
 	goto error_out;				\
     })
 
@@ -344,7 +341,6 @@ static struct rsapub *rsa_loadpub_core(RSAPUB_BNS(RSAPUB_LOADCORE_DEFBN)
     st->cl.apply=NULL;
     st->cl.interface=&st->ops;
     st->ops.st=st;
-    st->ops.sethash=rsa_pub_sethash;
     st->common.hashbuf=NULL;
     st->ops.unpick=rsa_sig_unpick;
     st->ops.check=rsa_sig_check;
@@ -356,14 +352,16 @@ static struct rsapub *rsa_loadpub_core(RSAPUB_BNS(RSAPUB_LOADCORE_DEFBN)
 #define RSAPUB_LOADCORE_GETBN(ix,en,what)				\
     if (mpz_init_set_str(&st->en,en##s,10)!=0) {			\
 	LDPUBFATAL(&en##_loc, what " \"%s\" is not a "			\
-		 "decimal number string\n",en##s);			\
+		 "decimal number string",en##s);			\
     }									\
     if (mpz_sizeinbase(&st->en, 256) > RSA_MAX_MODBYTES) {		\
-	LDPUBFATAL(&en##_loc, "implausibly large " what "\n");		\
+	LDPUBFATAL(&en##_loc, "implausibly large " what);		\
     }
 
     RSAPUB_BNS(RSAPUB_LOADCORE_GETBN)
 
+    rsa_sethash(l,&st->common,&st->ops.hash);
+
     return st;
 
  error_out:
@@ -378,6 +376,7 @@ static list_t *rsapub_apply(closure_t *self, struct cloc loc, dict_t *context,
     l->verror=verror_cfgfatal;
     l->postreadcheck=0;
     l->what="rsa-public";
+    l->deprdict=context;
     l->loc=loc;
 
 #define RSAPUB_APPLY_GETBN(ix,en,what)				\
@@ -401,10 +400,51 @@ static list_t *rsapub_apply(closure_t *self, struct cloc loc, dict_t *context,
     return new_closure(&st->cl);
 }
 
-#define LDFATAL(...)      ({ load_err(l,0,0,0,__VA_ARGS__); goto error_out; })
-#define LDUNSUP(...)      ({ load_err(l,0,0,1,__VA_ARGS__); goto error_out; })
-#define LDFATAL_FILE(...) ({ load_err(l,0,f,0,__VA_ARGS__); goto error_out; })
-#define LDUNSUP_FILE(...) ({ load_err(l,0,f,1,__VA_ARGS__); goto error_out; })
+bool_t rsa1_loadpub(const struct sigscheme_info *algo,
+		    struct buffer_if *pubkeydata,
+		    struct sigpubkey_if **sigpub_r,
+		    closure_t **closure_r,
+		    struct log_if *log, struct cloc loc)
+{
+    struct rsapub *st=0;
+
+    struct load_ctx l[1];
+    l->verror=verror_tryload;
+    l->postreadcheck=0;
+    l->what="rsa1_loadpub";
+    l->deprdict=0;
+    l->loc=loc;
+    l->u.tryload.log=log;
+
+    char *nul=buf_append(pubkeydata,1);
+    if (!nul) LDPUBFATAL(0,"rsa1 public key data too long for extra nul");
+    *nul=0;
+
+    const char *delim=" \t\n";
+    char *saveptr;
+    /*unused*/ strtok_r(pubkeydata->start,delim,&saveptr);
+
+#define RSAPUB_TRYLOAD_GETBN(ix,en,what)				\
+    struct cloc en##_loc=loc;						\
+    const char *en##s=strtok_r(0,delim,&saveptr);			\
+    if (!en##s) LDPUBFATAL(0,"end of pubkey data looking for " what);
+
+    RSAPUB_BNS(RSAPUB_TRYLOAD_GETBN);
+
+    st=rsa_loadpub_core(RSAPUB_BNS(RSAPUB_LOADCORE_PASSBN) l);
+    if (!st) goto error_out;
+
+    *sigpub_r=&st->ops;
+    *closure_r=&st->cl;
+    return True;
+
+ error_out:
+    rsapub_dispose(st);
+    return False;
+}
+
+#define LDFATAL(...)      ({ load_err(l,0,0,__VA_ARGS__); goto error_out; })
+#define LDFATAL_FILE(...) ({ load_err(l,0,f,__VA_ARGS__); goto error_out; })
 #define KEYFILE_GET(is)   ({					\
 	uint##is##_t keyfile_get_tmp=keyfile_get_##is(l,f);	\
 	if (!l->postreadcheck(l,f)) goto error_out;		\
@@ -464,7 +504,6 @@ static struct rsapriv *rsa_loadpriv_core(struct load_ctx *l,
     st->cl.apply=NULL;
     st->cl.interface=&st->ops;
     st->ops.st=st;
-    st->ops.sethash=rsa_priv_sethash;
     st->common.hashbuf=NULL;
     st->ops.sign=rsa_sign;
     st->ops.hash=0;
@@ -486,7 +525,7 @@ static struct rsapriv *rsa_loadpriv_core(struct load_ctx *l,
     length=strlen(AUTHFILE_ID_STRING)+1;
     b=safe_malloc(length,"rsapriv_apply");
     if (fread(b,length,1,f)!=1 || memcmp(b,AUTHFILE_ID_STRING,length)!=0) {
-	LDUNSUP_FILE("failed to read magic ID"
+	LDFATAL_FILE("failed to read magic ID"
 		     " string from SSH1 private keyfile\n");
     }
     FREE(b);
@@ -494,7 +533,7 @@ static struct rsapriv *rsa_loadpriv_core(struct load_ctx *l,
     cipher_type=fgetc(f);
     KEYFILE_GET(32); /* "Reserved data" */
     if (cipher_type != 0) {
-	LDUNSUP("we don't support encrypted keyfiles\n");
+	LDFATAL("we don't support encrypted keyfiles\n");
     }
 
     /* Read the public key */
@@ -592,6 +631,8 @@ static struct rsapriv *rsa_loadpriv_core(struct load_ctx *l,
 	fatal_perror("rsa-private (%s:%d): ferror",loc.file,loc.line);
     }
 
+    rsa_sethash(l,&st->common,&st->ops.hash);
+
     /*
      * Now verify the validity of the key, and set up the auxiliary
      * values for fast CRT signing.
@@ -672,13 +713,14 @@ error_out:
 static bool_t postreadcheck_tryload(struct load_ctx *l, FILE *f)
 {
     assert(!ferror(f));
-    if (feof(f)) { load_err(l,0,0,0,"eof mid-integer"); return False; }
+    if (feof(f)) { load_err(l,0,0,"eof mid-integer"); return False; }
     return True;
 }
 
 bool_t rsa1_loadpriv(const struct sigscheme_info *algo,
 		     struct buffer_if *privkeydata,
 		     struct sigprivkey_if **sigpriv_r,
+		     closure_t **closure_r,
 		     struct log_if *log, struct cloc loc)
 {
     FILE *f=0;
@@ -694,6 +736,7 @@ bool_t rsa1_loadpriv(const struct sigscheme_info *algo,
     l->what="rsa1priv load";
     l->verror=verror_tryload;
     l->postreadcheck=postreadcheck_tryload;
+    l->deprdict=0;
     l->loc=loc;
     l->u.tryload.log=log;
 
@@ -707,6 +750,7 @@ bool_t rsa1_loadpriv(const struct sigscheme_info *algo,
     if (f) fclose(f);
     if (!st) return False;
     *sigpriv_r=&st->ops;
+    *closure_r=&st->cl;
     return True;
 }
 
@@ -728,6 +772,7 @@ static list_t *rsapriv_apply(closure_t *self, struct cloc loc, dict_t *context,
     l->what="rsa-private";
     l->verror=verror_cfgfatal;
     l->postreadcheck=postreadcheck_apply;
+    l->deprdict=context;
     l->loc=loc;
 
     /* Argument is filename pointing to SSH1 private key file */
@@ -746,8 +791,10 @@ static list_t *rsapriv_apply(closure_t *self, struct cloc loc, dict_t *context,
     if (!f) {
 	if (just_check_config) {
 	    Message(M_WARNING,"rsa-private (%s:%d): cannot open keyfile "
-		    "\"%s\"; assuming it's valid while we check the "
-		    "rest of the configuration\n",loc.file,loc.line,filename);
+		    "\"%s\" (%s); assuming it's valid while we check the "
+		    "rest of the configuration\n",
+		    loc.file,loc.line,filename,strerror(errno));
+	    return list_new();
 	} else {
 	    fatal_perror("rsa-private (%s:%d): cannot open file \"%s\"",
 			 loc.file,loc.line,filename);