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ASN: refactor name constraints checks

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Use the same logic for any type of name constraint.

It could be even cleaner if there were a altNamesByType[],
permittedNamesByType[] and excludedNamesByType[] in cert.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
This commit is contained in:
Luiz Angelo Daros de Luca
2021-11-03 20:37:42 -03:00
parent d24bfb6bf7
commit 01335e2e1c
1 changed files with 74 additions and 160 deletions
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234
wolfcrypt/src/asn.c
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@@ -13678,8 +13678,13 @@ static int MatchBaseName(int type, const char* name, int nameSz,
{
if (base == NULL || baseSz <= 0 || name == NULL || nameSz <= 0 ||
name[0] == '.' || nameSz < baseSz ||
(type != ASN_RFC822_TYPE && type != ASN_DNS_TYPE))
(type != ASN_RFC822_TYPE && type != ASN_DNS_TYPE &&
type != ASN_DIR_TYPE)) {
return 0;
}
if (type == ASN_DIR_TYPE)
return XMEMCMP(name, base, baseSz) == 0;
/* If an email type, handle special cases where the base is only
* a domain, or is an email address itself. */
@@ -13743,190 +13748,99 @@ static int MatchBaseName(int type, const char* name, int nameSz,
static int ConfirmNameConstraints(Signer* signer, DecodedCert* cert)
{
const byte nameTypes[] = {ASN_RFC822_TYPE, ASN_DNS_TYPE, ASN_DIR_TYPE};
int i;
if (signer == NULL || cert == NULL)
return 0;
/* Check against the excluded list */
if (signer->excludedNames != NULL) {
Base_entry* base = signer->excludedNames;
if (signer->excludedNames == NULL && signer->permittedNames == NULL)
return 1;
while (base != NULL) {
switch (base->type) {
case ASN_DNS_TYPE:
{
DNS_entry* name = cert->altNames;
while (name != NULL) {
if (MatchBaseName(ASN_DNS_TYPE,
name->name, name->len,
base->name, base->nameSz)) {
return 0;
}
name = name->next;
}
break;
}
case ASN_RFC822_TYPE:
{
DNS_entry* name = cert->altEmailNames;
while (name != NULL) {
if (MatchBaseName(ASN_RFC822_TYPE,
name->name, name->len,
base->name, base->nameSz)) {
return 0;
}
name = name->next;
}
break;
}
case ASN_DIR_TYPE:
{
/* allow permitted dirName smaller than actual subject */
if (cert->subjectRawLen >= base->nameSz &&
XMEMCMP(cert->subjectRaw, base->name,
base->nameSz) == 0) {
return 0;
}
#ifndef WOLFSSL_NO_ASN_STRICT
/* RFC 5280 section 4.2.1.10
"Restrictions of the form directoryName MUST be
applied to the subject field .... and to any names
of type directoryName in the subjectAltName
extension"
*/
if (cert->altDirNames != NULL) {
DNS_entry* cur = cert->altDirNames;
while (cur != NULL) {
if (XMEMCMP(cur->name, base->name, base->nameSz)
== 0) {
WOLFSSL_MSG("DIR alt name constraint err");
return 0;
}
cur = cur->next;
}
}
#endif /* !WOLFSSL_NO_ASN_STRICT */
break;
}
default:
break;
}; /* switch */
base = base->next;
}
}
/* Check against the permitted list */
if (signer->permittedNames != NULL) {
int permittedDir = 0;
int matchDir;
for (i=0; i < (int)sizeof(nameTypes); i++) {
byte nameType = nameTypes[i];
DNS_entry* name = NULL;
DNS_entry subjectDnsName;
Base_entry* base;
DNS_entry* name;
/* Check each DNS name matches a permitted. */
name = cert->altNames;
while (name != NULL) {
int matchDns = 0;
int permittedDns = 0;
base = signer->permittedNames;
do {
/* Looking for permittedNames that are for DNS. */
if (base->type == ASN_DNS_TYPE) {
permittedDns = 1;
matchDns = MatchBaseName(ASN_DNS_TYPE,
name->name, name->len,
base->name, base->nameSz);
}
base = base->next;
} while (base != NULL && !matchDns);
/* If we found an DNS type permittedName then name must have had a
* match. */
if (permittedDns && !matchDns)
return 0;
if (!permittedDns)
switch (nameType) {
case ASN_DNS_TYPE:
/* Should it also consider CN in subject? It could use
* subjectDnsName too */
name = cert->altNames;
break;
case ASN_RFC822_TYPE:
/* Shouldn't it validade E= in subject as well? */
name = cert->altEmailNames;
break;
case ASN_DIR_TYPE:
if (cert->subjectRaw != NULL) {
subjectDnsName.next = NULL;
subjectDnsName.type = ASN_DIR_TYPE;
subjectDnsName.len = cert->subjectRawLen;
subjectDnsName.name = (char *)cert->subjectRaw;
name = &subjectDnsName;
}
name = name->next;
#ifndef WOLFSSL_NO_ASN_STRICT
/* RFC 5280 section 4.2.1.10
"Restrictions of the form directoryName MUST be
applied to the subject field .... and to any names
of type directoryName in the subjectAltName
extension"
*/
if (name != NULL)
name->next = cert->altDirNames;
else
name = cert->altDirNames;
#endif
break;
default:
/* Other types of names are ignored for now.
* Shouldn't it be rejected if it there is a altNamesByType[nameType]
* and signer->extNameConstraintCrit is set? */
return 0;
}
/* Check each email name matches a permitted. */
name = cert->altEmailNames;
while (name != NULL) {
int matchEmail = 0;
int permittedEmail = 0;
base = signer->permittedNames;
do {
/* Looking for permittedNames that are for email. */
if (base->type == ASN_RFC822_TYPE) {
permittedEmail = 1;
matchEmail = MatchBaseName(ASN_DNS_TYPE,
name->name, name->len,
base->name, base->nameSz);
}
base = base->next;
} while ((base != NULL) && !matchEmail);
/* If we found an email type permittedName then name must have had a
* match. */
if (permittedEmail && !matchEmail)
return 0;
int match = 0;
int need = 0;
if (!permittedEmail)
break;
name = name->next;
}
/* Check subject name matches a permitted name. */
if (cert->subjectRaw != NULL) {
matchDir = 0;
permittedDir = 0;
base = signer->permittedNames;
while (base != NULL && !matchDir) {
/* Looking for permittedNames that are for directoryName. */
if (base->type == ASN_DIR_TYPE) {
permittedDir = 1;
if (cert->subjectRawLen >= base->nameSz &&
XMEMCMP(cert->subjectRaw, base->name, base->nameSz)
== 0) {
matchDir = 1;
base = signer->excludedNames;
/* Check against the excluded list */
while (base != NULL) {
if (base->type == nameType) {
if (name->len >= base->nameSz &&
MatchBaseName(nameType,
name->name, name->len,
base->name, base->nameSz)) {
return 0;
}
}
base = base->next;
}
/* If we found an dir name type permittedName then name must have
* had a match. */
if (permittedDir && !matchDir)
return 0;
}
#ifndef WOLFSSL_NO_ASN_STRICT
/* RFC 5280 section 4.2.1.10
"Restrictions of the form directoryName MUST be
applied to the subject field .... and to any names
of type directoryName in the subjectAltName
extension"
*/
/* Check each alt dir name matches a permitted. */
name = cert->altDirNames;
while (permittedDir && name != NULL) {
int matchAltDir = 0;
/* Check against the permitted list */
base = signer->permittedNames;
do {
/* Looking for permittedNames that are for directoryName. */
if (base->type == ASN_DIR_TYPE) {
if (XMEMCMP(name->name, base->name, base->nameSz) == 0) {
matchAltDir = 1;
while (base != NULL) {
if (base->type == nameType) {
need = 1;
if (name->len >= base->nameSz &&
MatchBaseName(nameType,
name->name, name->len,
base->name, base->nameSz)) {
match = 1;
break;
}
}
base = base->next;
} while ((base != NULL) && !matchAltDir);
/* If we found an dir name type permittedName then name must have
* had a match. */
if (permittedDir && !matchAltDir)
}
if (need && !match)
return 0;
name = name->next;
}
#endif /* !WOLFSSL_NO_ASN_STRICT */
}
return 1;