#include <openssl/x509v3.h>
#include <openssl/objects.h>
+/* CRL score values */
+
+/* No unhandled critical extensions */
+
+#define CRL_SCORE_NOCRITICAL 0x100
+
+/* certificate is within CRL scope */
+
+#define CRL_SCORE_SCOPE 0x080
+
+/* CRL times valid */
+
+#define CRL_SCORE_TIME 0x040
+
+/* Issuer name matches certificate */
+
+#define CRL_SCORE_ISSUER_NAME 0x020
+
+/* If this score or above CRL is probably valid */
+
+#define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE)
+
+/* CRL issuer is certificate issuer */
+
+#define CRL_SCORE_ISSUER_CERT 0x018
+
+/* CRL issuer is on certificate path */
+
+#define CRL_SCORE_SAME_PATH 0x008
+
+/* CRL issuer matches CRL AKID */
+
+#define CRL_SCORE_AKID 0x004
+
+/* Have a delta CRL with valid times */
+
+#define CRL_SCORE_TIME_DELTA 0x002
+
static int null_callback(int ok,X509_STORE_CTX *e);
static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer);
static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x);
static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
unsigned int *preasons,
X509_CRL *crl, X509 *x);
+static int get_crl_delta(X509_STORE_CTX *ctx,
+ X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
+static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pcrl_score,
+ X509_CRL *base, STACK_OF(X509_CRL) *crls);
static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
X509 **pissuer, int *pcrl_score);
static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
static int check_cert(X509_STORE_CTX *ctx)
{
- X509_CRL *crl = NULL;
+ X509_CRL *crl = NULL, *dcrl = NULL;
X509 *x;
int ok, cnum;
cnum = ctx->error_depth;
while (ctx->current_reasons != CRLDP_ALL_REASONS)
{
/* Try to retrieve relevant CRL */
- ok = ctx->get_crl(ctx, &crl, x);
+ if (ctx->get_crl)
+ ok = ctx->get_crl(ctx, &crl, x);
+ else
+ ok = get_crl_delta(ctx, &crl, &dcrl, x);
/* If error looking up CRL, nothing we can do except
* notify callback
*/
ok = ctx->check_crl(ctx, crl);
if (!ok)
goto err;
- ok = ctx->cert_crl(ctx, crl, x);
- if (!ok)
- goto err;
+
+ if (dcrl)
+ {
+ ok = ctx->check_crl(ctx, dcrl);
+ if (!ok)
+ goto err;
+ ok = ctx->cert_crl(ctx, dcrl, x);
+ if (!ok)
+ goto err;
+ }
+ else
+ ok = 1;
+
+ /* Don't look in full CRL if delta reason is removefromCRL */
+ if (ok != 2)
+ {
+ ok = ctx->cert_crl(ctx, crl, x);
+ if (!ok)
+ goto err;
+ }
+
X509_CRL_free(crl);
+ X509_CRL_free(dcrl);
crl = NULL;
+ dcrl = NULL;
}
err:
X509_CRL_free(crl);
+ X509_CRL_free(dcrl);
+
ctx->current_crl = NULL;
return ok;
if (!ctx->verify_cb(0, ctx))
return 0;
}
-
- if (i < 0)
+ /* Ignore expiry of base CRL is delta is valid */
+ if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
{
if (!notify)
return 0;
return 1;
}
-/* CRL score values */
-
-/* No unhandled critical extensions */
-
-#define CRL_SCORE_NOCRITICAL 0x100
-
-/* certificate is within CRL scope */
-
-#define CRL_SCORE_SCOPE 0x080
-
-/* CRL times valid */
-
-#define CRL_SCORE_TIME 0x040
-
-/* Issuer name matches certificate */
-
-#define CRL_SCORE_ISSUER_NAME 0x020
-
-/* If this score or above CRL is probably valid */
-
-#define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE)
-
-/* CRL issuer is certificate issuer */
-
-#define CRL_SCORE_ISSUER_CERT 0x018
-
-/* CRL issuer is on certificate path */
-
-#define CRL_SCORE_SAME_PATH 0x008
-
-/* CRL issuer matches CRL AKID */
-
-#define CRL_SCORE_AKID 0x004
-
-/* CRL is complete, not delta */
-
-#define CRL_SCORE_COMPLETE 0x002
-
-static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509 **pissuer,
- int *pscore, unsigned int *preasons,
+static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
+ X509 **pissuer, int *pscore, unsigned int *preasons,
STACK_OF(X509_CRL) *crls)
{
int i, crl_score, best_score = *pscore;
*pissuer = best_crl_issuer;
*pscore = best_score;
*preasons = best_reasons;
- CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509);
+ CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
+ if (*pdcrl)
+ {
+ X509_CRL_free(*pdcrl);
+ *pdcrl = NULL;
+ }
+ get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
}
-
if (best_score >= CRL_SCORE_VALID)
return 1;
return 0;
}
+/* Compare two CRL extensions for delta checking purposes. They should be
+ * both present or both absent. If both present all fields must be identical.
+ */
+
+static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
+ {
+ ASN1_OCTET_STRING *exta, *extb;
+ int i;
+ i = X509_CRL_get_ext_by_NID(a, nid, 0);
+ if (i >= 0)
+ {
+ /* Can't have multiple occurrences */
+ if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
+ return 0;
+ exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
+ }
+ else
+ exta = NULL;
+
+ i = X509_CRL_get_ext_by_NID(b, nid, 0);
+
+ if (i >= 0)
+ {
+
+ if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
+ return 0;
+ extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
+ }
+ else
+ extb = NULL;
+
+ if (!exta && !extb)
+ return 1;
+
+ if (!exta || !extb)
+ return 0;
+
+
+ if (ASN1_OCTET_STRING_cmp(exta, extb))
+ return 0;
+
+ return 1;
+ }
+
+/* See if a base and delta are compatible */
+
+static int check_delta_base(X509_CRL *delta, X509_CRL *base)
+ {
+ /* Delta CRL must be a delta */
+ if (!delta->base_crl_number)
+ return 0;
+ /* Base must have a CRL number */
+ if (!base->crl_number)
+ return 0;
+ /* Issuer names must match */
+ if (X509_NAME_cmp(X509_CRL_get_issuer(base),
+ X509_CRL_get_issuer(delta)))
+ return 0;
+ /* AKID and IDP must match */
+ if (!crl_extension_match(delta, base, NID_authority_key_identifier))
+ return 0;
+ if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
+ return 0;
+ /* Delta CRL base number must not exceed Full CRL number. */
+ if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
+ return 0;
+ /* Delta CRL number must exceed full CRL number */
+ if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
+ return 1;
+ return 0;
+ }
+
+/* For a given base CRL find a delta... maybe extend to delta scoring
+ * or retrieve a chain of deltas...
+ */
+
+static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
+ X509_CRL *base, STACK_OF(X509_CRL) *crls)
+ {
+ X509_CRL *delta;
+ int i;
+ if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
+ return;
+ if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
+ return;
+ for (i = 0; i < sk_X509_CRL_num(crls); i++)
+ {
+ delta = sk_X509_CRL_value(crls, i);
+ if (check_delta_base(delta, base))
+ {
+ if (check_crl_time(ctx, delta, 0))
+ *pscore |= CRL_SCORE_TIME_DELTA;
+ CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
+ *dcrl = delta;
+ return;
+ }
+ }
+ *dcrl = NULL;
+ }
+
/* For a given CRL return how suitable it is for the supplied certificate 'x'.
* The return value is a mask of several criteria.
* If the issuer is not the certificate issuer this is returned in *pissuer.
if (!(crl->idp_reasons & ~tmp_reasons))
return 0;
}
+ /* Don't process deltas at this stage */
+ else if (crl->base_crl_number)
+ return 0;
/* If issuer name doesn't match certificate need indirect CRL */
if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
{
return 0;
}
-/* Retrieve CRL corresponding to current certificate. Currently only
- * one CRL is retrieved. Multiple CRLs may be needed if we handle
- * CRLs partitioned on reason code later.
+/* Retrieve CRL corresponding to current certificate.
+ * If deltas enabled try to find a delta CRL too
*/
-static int get_crl(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509 *x)
+static int get_crl_delta(X509_STORE_CTX *ctx,
+ X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
{
int ok;
X509 *issuer = NULL;
int crl_score = 0;
unsigned int reasons;
- X509_CRL *crl = NULL;
+ X509_CRL *crl = NULL, *dcrl = NULL;
STACK_OF(X509_CRL) *skcrl;
X509_NAME *nm = X509_get_issuer_name(x);
reasons = ctx->current_reasons;
- ok = get_crl_sk(ctx, &crl, &issuer, &crl_score, &reasons, ctx->crls);
+ ok = get_crl_sk(ctx, &crl, &dcrl,
+ &issuer, &crl_score, &reasons, ctx->crls);
+
if (ok)
goto done;
if (!skcrl && crl)
goto done;
- get_crl_sk(ctx, &crl, &issuer, &crl_score, &reasons, skcrl);
+ get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
ctx->current_crl_score = crl_score;
ctx->current_reasons = reasons;
*pcrl = crl;
+ *pdcrl = dcrl;
return 1;
}
/* if we have an alternative CRL issuer cert use that */
if (ctx->current_issuer)
issuer = ctx->current_issuer;
+
/* Else find CRL issuer: if not last certificate then issuer
* is next certificate in chain.
*/
if(issuer)
{
- /* Check for cRLSign bit if keyUsage present */
- if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
- !(issuer->ex_kusage & KU_CRL_SIGN))
+ /* Skip most tests for deltas because they have already
+ * been done
+ */
+ if (!crl->base_crl_number)
{
- ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
- ok = ctx->verify_cb(0, ctx);
- if(!ok) goto err;
- }
+ /* Check for cRLSign bit if keyUsage present */
+ if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
+ !(issuer->ex_kusage & KU_CRL_SIGN))
+ {
+ ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
+ ok = ctx->verify_cb(0, ctx);
+ if(!ok) goto err;
+ }
- if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
- {
- ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
- ok = ctx->verify_cb(0, ctx);
- if(!ok) goto err;
- }
+ if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
+ {
+ ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
+ ok = ctx->verify_cb(0, ctx);
+ if(!ok) goto err;
+ }
+
+ if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
+ {
+ if (!check_crl_path(ctx, ctx->current_issuer))
+ {
+ ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
+ ok = ctx->verify_cb(0, ctx);
+ if(!ok) goto err;
+ }
+ }
+
+ if (crl->idp_flags & IDP_INVALID)
+ {
+ ctx->error = X509_V_ERR_INVALID_EXTENSION;
+ ok = ctx->verify_cb(0, ctx);
+ if(!ok) goto err;
+ }
- if (!(ctx->current_crl_score & CRL_SCORE_TIME))
- {
- ok = check_crl_time(ctx, crl, 1);
- if (!ok)
- goto err;
- }
- if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
- {
- if (!check_crl_path(ctx, ctx->current_issuer))
- {
- ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
- ok = ctx->verify_cb(0, ctx);
- if(!ok) goto err;
}
- }
- if (crl->idp_flags & IDP_INVALID)
+ if (!(ctx->current_crl_score & CRL_SCORE_TIME))
{
- ctx->error = X509_V_ERR_INVALID_EXTENSION;
- ok = ctx->verify_cb(0, ctx);
- if(!ok) goto err;
+ ok = check_crl_time(ctx, crl, 1);
+ if (!ok)
+ goto err;
}
/* Attempt to get issuer certificate public key */
static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
{
int ok;
- /* Look for serial number of certificate in CRL
- * If found assume revoked: want something cleverer than
- * this to handle entry extensions in V2 CRLs.
+ X509_REVOKED *rev;
+ /* The rules changed for this... previously if a CRL contained
+ * unhandled critical extensions it could still be used to indicate
+ * a certificate was revoked. This has since been changed since
+ * critical extension can change the meaning of CRL entries.
*/
- if (X509_CRL_get0_by_cert(crl, NULL, x) > 0)
- {
- ctx->error = X509_V_ERR_CERT_REVOKED;
- ok = ctx->verify_cb(0, ctx);
- if (!ok)
- return 0;
- }
-
if (crl->flags & EXFLAG_CRITICAL)
{
if (ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
if(!ok)
return 0;
}
+ /* Look for serial number of certificate in CRL
+ * If found make sure reason is not removeFromCRL.
+ */
+ if (X509_CRL_get0_by_cert(crl, &rev, x))
+ {
+ if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
+ return 2;
+ ctx->error = X509_V_ERR_CERT_REVOKED;
+ ok = ctx->verify_cb(0, ctx);
+ if (!ok)
+ return 0;
+ }
return 1;
}
if (store && store->get_crl)
ctx->get_crl = store->get_crl;
else
- ctx->get_crl = get_crl;
+ ctx->get_crl = NULL;
if (store && store->check_crl)
ctx->check_crl = store->check_crl;
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