shithub: drawterm-fdroid

Info  •  Files  •  Log  •  Branches

libsec: update thumbprint implementation from 9front

--- a/include/libsec.h

+++ b/include/libsec.h

@@ -449,7 +449,8 @@

  */

 typedef struct Thumbprint{

 	struct Thumbprint *next;

-	uchar	sha1[SHA1dlen];

+	uchar	hash[SHA2_256dlen];

+	uchar	len;

 } Thumbprint;

 typedef struct TLSconn{

@@ -475,9 +476,10 @@

 int tlsServer(int fd, TLSconn *c);

 /* thumb.c */

-Thumbprint* initThumbprints(char *ok, char *crl);

+Thumbprint* initThumbprints(char *ok, char *crl, char *tag);

 void	freeThumbprints(Thumbprint *ok);

-int	okThumbprint(uchar *sha1, Thumbprint *ok);

+int	okThumbprint(uchar *hash, int len, Thumbprint *ok);

+int	okCertificate(uchar *cert, int len, Thumbprint *ok);

 /* readcert.c */

 uchar	*readcert(char *filename, int *pcertlen);

--- a/libsec/thumb.c

+++ b/libsec/thumb.c

@@ -5,9 +5,9 @@

 enum{ ThumbTab = 1<<10 };

 static Thumbprint*

-tablehead(uchar *sum, Thumbprint *table)

+tablehead(uchar *hash, Thumbprint *table)

 {

-	return &table[((sum[0]<<8) + sum[1]) & (ThumbTab-1)];

+	return &table[((hash[0]<<8) + hash[1]) & (ThumbTab-1)];

 }

 void

@@ -27,15 +27,15 @@

 }

 int

-okThumbprint(uchar *sum, Thumbprint *table)

+okThumbprint(uchar *hash, int len, Thumbprint *table)

 {

 	Thumbprint *hd, *p;

 	if(table == nil)

 		return 0;

-	hd = tablehead(sum, table);

+	hd = tablehead(hash, table);

 	for(p = hd->next; p; p = p->next){

-		if(memcmp(sum, p->sha1, SHA1dlen) == 0)

+		if(p->len == len && memcmp(hash, p->hash, len) == 0)

 			return 1;

 		if(p == hd)

 			break;

@@ -43,14 +43,51 @@

 	return 0;

 }

+int

+okCertificate(uchar *cert, int len, Thumbprint *table)

+{

+	uchar hash[SHA2_256dlen];

+	char thumb[2*SHA2_256dlen+1];

+

+	if(table == nil){

+		werrstr("no thumbprints provided");

+		return 0;

+	}

+	if(cert == nil || len <= 0){

+		werrstr("no certificate provided");

+		return 0;

+	}

+

+	sha1(cert, len, hash, nil);

+	if(okThumbprint(hash, SHA1dlen, table))

+		return 1;

+

+	sha2_256(cert, len, hash, nil);

+	if(okThumbprint(hash, SHA2_256dlen, table))

+		return 1;

+

+	len = enc64(thumb, sizeof(thumb), hash, SHA2_256dlen);

+	while(len > 0 && thumb[len-1] == '=')

+		len--;

+	thumb[len] = '\0';

+	werrstr("sha256=%s", thumb);

+

+	return 0;

+}

+

 static int

-loadThumbprints(char *file, Thumbprint *table, Thumbprint *crltab)

+loadThumbprints(char *file, char *tag, Thumbprint *table, Thumbprint *crltab, int depth)

 {

 	Thumbprint *hd, *entry;

 	char *line, *field[50];

-	uchar sum[SHA1dlen];

+	uchar hash[SHA2_256dlen];

 	Biobuf *bin;

+	int len, n;

+	if(depth > 8){

+		werrstr("too many includes, last file %s", file);

+		return -1;

+	}

 	if(access(file, AEXIST) < 0)

 		return 0;	/* not an error */

 	if((bin = Bopen(file, OREAD)) == nil)

@@ -59,20 +96,30 @@

 		if(tokenize(line, field, nelem(field)) < 2)

 			continue;

 		if(strcmp(field[0], "#include") == 0){

-			if(loadThumbprints(field[1], table, crltab) < 0)

+			if(loadThumbprints(field[1], tag, table, crltab, depth+1) < 0)

 				goto err;

 			continue;

 		}

-		if(strcmp(field[0], "x509") != 0 || strncmp(field[1], "sha1=", 5) != 0)

+		if(strcmp(field[0], tag) != 0)

 			continue;

-		field[1] += 5;

-		if(dec16(sum, SHA1dlen, field[1], strlen(field[1])) != SHA1dlen){

-			werrstr("malformed x509 entry in %s: %s", file, field[1]);

+		if(strncmp(field[1], "sha1=", 5) == 0){

+			field[1] += 5;

+			len = SHA1dlen;

+		} else if(strncmp(field[1], "sha256=", 7) == 0){

+			field[1] += 7;

+			len = SHA2_256dlen;

+		} else {

+			continue;

+		}

+		n = strlen(field[1]);

+		if((n != len*2 || dec16(hash, len, field[1], n) != len)

+		&& dec64(hash, len, field[1], n) != len){

+			werrstr("malformed %s entry in %s: %s", tag, file, field[1]);

 			goto err;

 		}

-		if(crltab && okThumbprint(sum, crltab))

+		if(crltab && okThumbprint(hash, len, crltab))

 			continue;

-		hd = tablehead(sum, table);

+		hd = tablehead(hash, table);

 		if(hd->next == nil)

 			entry = hd;

 		else {

@@ -81,7 +128,8 @@

 			entry->next = hd->next;

 		}

 		hd->next = entry;

-		memcpy(entry->sha1, sum, SHA1dlen);

+		entry->len = len;

+		memcpy(entry->hash, hash, len);

 	}

 	Bterm(bin);

 	return 0;

@@ -92,7 +140,7 @@

 }

 Thumbprint *

-initThumbprints(char *ok, char *crl)

+initThumbprints(char *ok, char *crl, char *tag)

 {

 	Thumbprint *table, *crltab;

@@ -101,13 +149,13 @@

 		if((crltab = malloc(ThumbTab * sizeof(*crltab))) == nil)

 			goto err;

 		memset(crltab, 0, ThumbTab * sizeof(*crltab));

-		if(loadThumbprints(crl, crltab, nil) < 0)

+		if(loadThumbprints(crl, tag, crltab, nil, 0) < 0)

 			goto err;

 	}

 	if((table = malloc(ThumbTab * sizeof(*table))) == nil)

 		goto err;

 	memset(table, 0, ThumbTab * sizeof(*table));

-	if(loadThumbprints(ok, table, crltab) < 0){

+	if(loadThumbprints(ok, tag, table, crltab, 0) < 0){

 		freeThumbprints(table);

 		table = nil;

 	}