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Fix in asn1_get_printable string

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Buffer overflow vulnerability in proc.c
Possible double memory release on invalid certificates.


git-svn-id: svn://svn.code.sf.net/p/axtls/code/trunk@221 9a5d90b5-6617-0410-8a86-bb477d3ed2e3
This commit is contained in:
cameronrich
2012-02-10 10:31:02 +00:00
parent 1378f8a78f
commit ffa4da45ee
5 changed files with 29 additions and 17 deletions
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17
ssl/asn1.c
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@ -288,19 +288,20 @@ end_oid:
static int asn1_get_printable_str(const uint8_t *buf, int *offset, char **str)
{
int len = X509_NOT_OK;
int asn1_type = buf[*offset];
/* some certs have this awful crud in them for some reason */
if (buf[*offset] != ASN1_PRINTABLE_STR &&
buf[*offset] != ASN1_PRINTABLE_STR2 &&
buf[*offset] != ASN1_TELETEX_STR &&
buf[*offset] != ASN1_IA5_STR &&
buf[*offset] != ASN1_UNICODE_STR)
if (buf[asn1_type] != ASN1_PRINTABLE_STR &&
buf[asn1_type] != ASN1_PRINTABLE_STR2 &&
buf[asn1_type] != ASN1_TELETEX_STR &&
buf[asn1_type] != ASN1_IA5_STR &&
buf[asn1_type] != ASN1_UNICODE_STR)
goto end_pnt_str;
(*offset)++;
len = get_asn1_length(buf, offset);
if (buf[*offset - 1] == ASN1_UNICODE_STR)
if (buf[asn1_type - 1] == ASN1_UNICODE_STR)
{
int i;
*str = (char *)malloc(len/2+1); /* allow for null */
@ -330,7 +331,7 @@ int asn1_name(const uint8_t *cert, int *offset, char *dn[])
{
int ret = X509_NOT_OK;
int dn_type;
char *tmp = NULL;
char *tmp;
if (asn1_next_obj(cert, offset, ASN1_SEQUENCE) < 0)
goto end_name;
@ -343,6 +344,8 @@ int asn1_name(const uint8_t *cert, int *offset, char *dn[])
(dn_type = asn1_get_oid_x520(cert, offset)) < 0)
goto end_name;
tmp = NULL;
if (asn1_get_printable_str(cert, offset, &tmp) < 0)
{
free(tmp);