code: plan9front

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libsec: do proper type checking, fix wrong deduplication check

--- a/sys/src/libsec/port/x509.c

+++ b/sys/src/libsec/port/x509.c

@@ -1905,7 +1905,9 @@

  	esubj = &el->hd;

  	el = el->tl;

  	epubkey = &el->hd;

-	if(el->tl != nil && el->tl->hd.tag.class == Context && el->tl->hd.tag.num == 3){

+	if(el->tl != nil

+	&& el->tl->hd.tag.class == Context && el->tl->hd.tag.num == 3

+	&& el->tl->hd.val.tag == VOctets){

 		c->ext = el->tl->hd.val.u.octetsval;

 		el->tl->hd.val.u.octetsval = nil;	/* transfer ownership */

 	}

@@ -2742,12 +2744,13 @@

 			continue;

 		case 1:	/* email */

 		case 2:	/* DNS */

-			if(ext == nil)

+			if(el->hd.val.tag != VOctets)

 				goto erralt;

 			alt = smprint("%.*s", ext->len, (char*)ext->data);

 			break;

 		case 4:	/* DN */

-			if(ext == nil || decode(ext->data, ext->len, &edn) != ASN_OK)

+			if(el->hd.val.tag != VOctets

+			|| decode(ext->data, ext->len, &edn) != ASN_OK)

 				goto erralt;

 			alt = parse_name(&edn);

 			freevalfields(&edn.val);

@@ -2756,7 +2759,7 @@

 		if(alt == nil)

 			goto erralt;

 		len = strlen(alt);

-		if(strncmp(name, alt, len) == 0 && strchr(",", name[len]) == nil){

+		if(strncmp(name, alt, len) == 0 && strchr(",", name[len]) != nil){

 			free(alt);	/* same as the subject */

 			continue;

 		}

@@ -2998,7 +3001,10 @@

 	copysubject(name, nname, subject);

 	free(subject);

 	el = el->tl;

-	if(el->tl != nil && el->tl->hd.tag.class == Context && el->tl->hd.tag.num == 0)

+	if(el->tl != nil

+	&& el->tl->hd.tag.class == Context

+	&& el->tl->hd.tag.num == 0

+	&& el->tl->hd.val.tag == VOctets)

 		appendaltnames(name, nname, el->tl->hd.val.u.octetsval, 1);

 	if(!is_seq(&el->hd, &el) || elistlen(el) != 2)

 		goto errret;