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Add a possibility to write subject alt names in a certificate

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Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2023-04-04 06:56:14 -04:00
parent ccdd975286
commit 67fdb3307d
2 changed files with 126 additions and 0 deletions
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3
include/mbedtls/x509_crt.h
View File

@ -241,6 +241,9 @@ typedef struct mbedtls_x509write_cert {
}
mbedtls_x509write_cert;
int mbedtls_x509write_crt_set_subject_alternative_name(mbedtls_x509write_cert *ctx,
const mbedtls_x509_san_list *san_list);
/**
* Item in a verification chain: cert and flags for it
*/

123
library/x509write_crt.c
View File

@ -31,6 +31,7 @@
#include "mbedtls/asn1write.h"
#include "mbedtls/error.h"
#include "mbedtls/oid.h"
#include "mbedtls/platform.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/md.h"
@ -152,6 +153,128 @@ int mbedtls_x509write_crt_set_validity(mbedtls_x509write_cert *ctx,
return 0;
}
int mbedtls_x509write_crt_set_subject_alternative_name(mbedtls_x509write_cert *ctx,
const mbedtls_x509_san_list *san_list)
{
int ret = 0;
const mbedtls_x509_san_list *cur;
unsigned char *buf;
unsigned char *p;
size_t len;
size_t buflen = 0;
/* Determine the maximum size of the SubjectAltName list */
for (cur = san_list; cur != NULL; cur = cur->next) {
/* Calculate size of the required buffer */
switch (cur->node.type) {
case MBEDTLS_X509_SAN_DNS_NAME:
case MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER:
case MBEDTLS_X509_SAN_IP_ADDRESS:
/* length of value for each name entry,
* maximum 4 bytes for the length field,
* 1 byte for the tag/type.
*/
buflen += cur->node.san.unstructured_name.len + 4 + 1;
break;
case MBEDTLS_X509_SAN_DIRECTORY_NAME:
const mbedtls_asn1_named_data *chunk = &cur->node.san.directory_name;
while (chunk != NULL) {
// 5 bytes for OID, max 4 bytes for length, +1 for tag,
// additional 4 max for length, +1 for tag.
// See x509_write_name for more information.
buflen += chunk->val.len + 5 + 4 + 1 + 4 + 1;
chunk = chunk->next;
}
buflen += cur->node.san.unstructured_name.len + 4 + 1;
break;
default:
/* Not supported - skip. */
break;
}
}
/* Add the extra length field and tag */
buflen += 4 + 1;
/* Allocate buffer */
buf = mbedtls_calloc(1, buflen);
if (buf == NULL) {
return MBEDTLS_ERR_ASN1_ALLOC_FAILED;
}
mbedtls_platform_zeroize(buf, buflen);
p = buf + buflen;
/* Write ASN.1-based structure */
cur = san_list;
len = 0;
while (cur != NULL) {
size_t single_san_len = 0;
switch (cur->node.type) {
case MBEDTLS_X509_SAN_DNS_NAME:
case MBEDTLS_X509_SAN_RFC822_NAME:
case MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER:
case MBEDTLS_X509_SAN_IP_ADDRESS:
{
const unsigned char *unstructured_name =
(const unsigned char *) cur->node.san.unstructured_name.p;
size_t unstructured_name_len = cur->node.san.unstructured_name.len;
MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len,
mbedtls_asn1_write_raw_buffer(
&p, buf,
unstructured_name, unstructured_name_len));
MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len, mbedtls_asn1_write_len(
&p, buf, unstructured_name_len));
MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len,
mbedtls_asn1_write_tag(
&p, buf,
MBEDTLS_ASN1_CONTEXT_SPECIFIC | cur->node.type));
}
break;
case MBEDTLS_X509_SAN_DIRECTORY_NAME:
MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len,
mbedtls_x509_write_names(&p, buf,
(mbedtls_asn1_named_data *) &
cur->node
.san.directory_name));
MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len,
mbedtls_asn1_write_len(&p, buf, single_san_len));
MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len,
mbedtls_asn1_write_tag(&p, buf,
MBEDTLS_ASN1_CONTEXT_SPECIFIC |
MBEDTLS_ASN1_CONSTRUCTED |
MBEDTLS_X509_SAN_DIRECTORY_NAME));
break;
default:
/* Skip unsupported names. */
break;
}
cur = cur->next;
len += single_san_len;
}
MBEDTLS_ASN1_CHK_CLEANUP_ADD(len, mbedtls_asn1_write_len(&p, buf, len));
MBEDTLS_ASN1_CHK_CLEANUP_ADD(len,
mbedtls_asn1_write_tag(&p, buf,
MBEDTLS_ASN1_CONSTRUCTED |
MBEDTLS_ASN1_SEQUENCE));
ret = mbedtls_x509write_crt_set_extension(
ctx,
MBEDTLS_OID_SUBJECT_ALT_NAME,
MBEDTLS_OID_SIZE(MBEDTLS_OID_SUBJECT_ALT_NAME),
0,
buf + buflen - len,
len);
cleanup:
mbedtls_free(buf);
return ret;
}
int mbedtls_x509write_crt_set_extension(mbedtls_x509write_cert *ctx,
const char *oid, size_t oid_len,
int critical,