-/* IDP name field matches CRLDP or IDP name not present */
-#define CRL_SCORE_SCOPE 4
-/* AKID present and matches cert, or AKID not present */
-#define CRL_SCORE_AKID 2
-/* times OK */
-#define CRL_SCORE_TIME 1
-
-#define CRL_SCORE_ALL 7
-
-/* IDP flags which cause a CRL to be rejected */
-
-#define IDP_REJECT (IDP_INVALID|IDP_INDIRECT|IDP_REASONS)
-
-static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl,
- X509_NAME *nm, STACK_OF(X509_CRL) *crls)
- {
- int i, crl_score, best_score = -1;
- X509_CRL *crl, *best_crl = NULL;
- for (i = 0; i < sk_X509_CRL_num(crls); i++)
- {
- crl_score = 0;
- crl = sk_X509_CRL_value(crls, i);
- if (nm && X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
- continue;
- if (check_crl_time(ctx, crl, 0))
- crl_score |= CRL_SCORE_TIME;
-
- if (crl->idp_flags & IDP_PRESENT)
- {
- if (crl->idp_flags & IDP_REJECT)
- continue;
- if (idp_check_scope(ctx->current_cert, crl))
- crl_score |= CRL_SCORE_SCOPE;
- }
- else
- crl_score |= CRL_SCORE_SCOPE;
-
- if (crl->akid)
- {
- if (crl_akid_check(ctx, crl->akid))
- crl_score |= CRL_SCORE_AKID;
- }
- else
- crl_score |= CRL_SCORE_AKID;
-
- if (crl_score == CRL_SCORE_ALL)
- {
- *pcrl = crl;
- CRYPTO_add(&crl->references, 1, CRYPTO_LOCK_X509_CRL);
- return 1;
- }
-
- if (crl_score > best_score)
- {
- best_crl = crl;
- best_score = crl_score;
- }
- }
- if (best_crl)
- {
- *pcrl = best_crl;
- CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509);
- }
-
- return 0;
- }
-
-static int crl_akid_check(X509_STORE_CTX *ctx, AUTHORITY_KEYID *akid)
- {
- int cidx = ctx->error_depth;
- if (cidx != sk_X509_num(ctx->chain) - 1)
- cidx++;
- if (X509_check_akid(sk_X509_value(ctx->chain, cidx), akid) == X509_V_OK)
- return 1;
- return 0;
- }
-
-
-/* Check IDP name matches at least one CRLDP name */
-
-static int idp_check_scope(X509 *x, X509_CRL *crl)
- {
- int i, j, k;
- GENERAL_NAMES *inames, *dnames;
- if (crl->idp_flags & IDP_ONLYATTR)
- return 0;
- if (x->ex_flags & EXFLAG_CA)
- {
- if (crl->idp_flags & IDP_ONLYUSER)
- return 0;
- }
- else
- {
- if (crl->idp_flags & IDP_ONLYCA)
- return 0;
- }
- if (!crl->idp->distpoint)
- return 1;
- if (crl->idp->distpoint->type != 0)
- return 1;
- if (!x->crldp)
- return 0;
- inames = crl->idp->distpoint->name.fullname;
- for (i = 0; i < sk_GENERAL_NAME_num(inames); i++)
- {
- GENERAL_NAME *igen = sk_GENERAL_NAME_value(inames, i);
- for (j = 0; j < sk_DIST_POINT_num(x->crldp); j++)
- {
- DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, j);
- /* We don't handle these at present */
- if (dp->reasons || dp->CRLissuer)
- continue;
- if (!dp->distpoint || (dp->distpoint->type != 0))
- continue;
- dnames = dp->distpoint->name.fullname;
- for (k = 0; k < sk_GENERAL_NAME_num(dnames); k++)
- {
- GENERAL_NAME *cgen =
- sk_GENERAL_NAME_value(dnames, k);
- if (!GENERAL_NAME_cmp(igen, cgen))
- return 1;
- }
- }
- }
- 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.
+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, -1);
+ 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, -1);
+
+ 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. The reasons mask is
+ * also used to determine if the CRL is suitable: if no new reasons the CRL
+ * is rejected, otherwise reasons is updated.
+ */
+
+static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
+ unsigned int *preasons, X509_CRL *crl, X509 *x)
+{
+
+ int crl_score = 0;
+ unsigned int tmp_reasons = *preasons, crl_reasons;
+
+ /* First see if we can reject CRL straight away */
+
+ /* Invalid IDP cannot be processed */
+ if (crl->idp_flags & IDP_INVALID)
+ return 0;
+ /* Reason codes or indirect CRLs need extended CRL support */
+ if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT)) {
+ if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
+ return 0;
+ } else if (crl->idp_flags & IDP_REASONS) {
+ /* If no new reasons reject */
+ 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))) {
+ if (!(crl->idp_flags & IDP_INDIRECT))
+ return 0;
+ } else
+ crl_score |= CRL_SCORE_ISSUER_NAME;
+
+ if (!(crl->flags & EXFLAG_CRITICAL))
+ crl_score |= CRL_SCORE_NOCRITICAL;
+
+ /* Check expiry */
+ if (check_crl_time(ctx, crl, 0))
+ crl_score |= CRL_SCORE_TIME;
+
+ /* Check authority key ID and locate certificate issuer */
+ crl_akid_check(ctx, crl, pissuer, &crl_score);
+
+ /* If we can't locate certificate issuer at this point forget it */
+
+ if (!(crl_score & CRL_SCORE_AKID))
+ return 0;
+
+ /* Check cert for matching CRL distribution points */
+
+ if (crl_crldp_check(x, crl, crl_score, &crl_reasons)) {
+ /* If no new reasons reject */
+ if (!(crl_reasons & ~tmp_reasons))
+ return 0;
+ tmp_reasons |= crl_reasons;
+ crl_score |= CRL_SCORE_SCOPE;
+ }
+
+ *preasons = tmp_reasons;
+
+ return crl_score;
+
+}
+
+static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
+ X509 **pissuer, int *pcrl_score)
+{
+ X509 *crl_issuer = NULL;
+ X509_NAME *cnm = X509_CRL_get_issuer(crl);
+ int cidx = ctx->error_depth;
+ int i;
+
+ if (cidx != sk_X509_num(ctx->chain) - 1)
+ cidx++;
+
+ crl_issuer = sk_X509_value(ctx->chain, cidx);
+
+ if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
+ if (*pcrl_score & CRL_SCORE_ISSUER_NAME) {
+ *pcrl_score |= CRL_SCORE_AKID | CRL_SCORE_ISSUER_CERT;
+ *pissuer = crl_issuer;
+ return;
+ }
+ }
+
+ for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++) {
+ crl_issuer = sk_X509_value(ctx->chain, cidx);
+ if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
+ continue;
+ if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
+ *pcrl_score |= CRL_SCORE_AKID | CRL_SCORE_SAME_PATH;
+ *pissuer = crl_issuer;
+ return;
+ }
+ }
+
+ /* Anything else needs extended CRL support */
+
+ if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
+ return;
+
+ /*
+ * Otherwise the CRL issuer is not on the path. Look for it in the set of
+ * untrusted certificates.
+ */
+ for (i = 0; i < sk_X509_num(ctx->untrusted); i++) {
+ crl_issuer = sk_X509_value(ctx->untrusted, i);
+ if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
+ continue;
+ if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
+ *pissuer = crl_issuer;
+ *pcrl_score |= CRL_SCORE_AKID;
+ return;
+ }
+ }
+}
+
+/*
+ * Check the path of a CRL issuer certificate. This creates a new
+ * X509_STORE_CTX and populates it with most of the parameters from the
+ * parent. This could be optimised somewhat since a lot of path checking will
+ * be duplicated by the parent, but this will rarely be used in practice.
+ */
+
+static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
+{
+ X509_STORE_CTX crl_ctx;
+ int ret;
+ /* Don't allow recursive CRL path validation */
+ if (ctx->parent)
+ return 0;
+ if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
+ return -1;
+
+ crl_ctx.crls = ctx->crls;
+ /* Copy verify params across */
+ X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
+
+ crl_ctx.parent = ctx;
+ crl_ctx.verify_cb = ctx->verify_cb;
+
+ /* Verify CRL issuer */
+ ret = X509_verify_cert(&crl_ctx);
+
+ if (ret <= 0)
+ goto err;
+
+ /* Check chain is acceptable */
+
+ ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
+ err:
+ X509_STORE_CTX_cleanup(&crl_ctx);
+ return ret;
+}
+
+/*
+ * RFC3280 says nothing about the relationship between CRL path and
+ * certificate path, which could lead to situations where a certificate could
+ * be revoked or validated by a CA not authorised to do so. RFC5280 is more
+ * strict and states that the two paths must end in the same trust anchor,
+ * though some discussions remain... until this is resolved we use the
+ * RFC5280 version
+ */
+
+static int check_crl_chain(X509_STORE_CTX *ctx,
+ STACK_OF(X509) *cert_path,
+ STACK_OF(X509) *crl_path)
+{
+ X509 *cert_ta, *crl_ta;
+ cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
+ crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
+ if (!X509_cmp(cert_ta, crl_ta))
+ return 1;
+ return 0;
+}
+
+/*-
+ * Check for match between two dist point names: three separate cases.
+ * 1. Both are relative names and compare X509_NAME types.
+ * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
+ * 3. Both are full names and compare two GENERAL_NAMES.
+ * 4. One is NULL: automatic match.
+ */
+
+static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
+{
+ X509_NAME *nm = NULL;
+ GENERAL_NAMES *gens = NULL;
+ GENERAL_NAME *gena, *genb;
+ int i, j;
+ if (!a || !b)
+ return 1;
+ if (a->type == 1) {
+ if (!a->dpname)
+ return 0;
+ /* Case 1: two X509_NAME */
+ if (b->type == 1) {
+ if (!b->dpname)
+ return 0;
+ if (!X509_NAME_cmp(a->dpname, b->dpname))
+ return 1;
+ else
+ return 0;
+ }
+ /* Case 2: set name and GENERAL_NAMES appropriately */
+ nm = a->dpname;
+ gens = b->name.fullname;
+ } else if (b->type == 1) {
+ if (!b->dpname)
+ return 0;
+ /* Case 2: set name and GENERAL_NAMES appropriately */
+ gens = a->name.fullname;
+ nm = b->dpname;
+ }
+
+ /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
+ if (nm) {
+ for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
+ gena = sk_GENERAL_NAME_value(gens, i);
+ if (gena->type != GEN_DIRNAME)
+ continue;
+ if (!X509_NAME_cmp(nm, gena->d.directoryName))
+ return 1;
+ }
+ return 0;
+ }
+
+ /* Else case 3: two GENERAL_NAMES */
+
+ for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++) {
+ gena = sk_GENERAL_NAME_value(a->name.fullname, i);
+ for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++) {
+ genb = sk_GENERAL_NAME_value(b->name.fullname, j);
+ if (!GENERAL_NAME_cmp(gena, genb))
+ return 1;
+ }
+ }
+
+ return 0;
+
+}
+
+static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
+{
+ int i;
+ X509_NAME *nm = X509_CRL_get_issuer(crl);
+ /* If no CRLissuer return is successful iff don't need a match */
+ if (!dp->CRLissuer)
+ return ! !(crl_score & CRL_SCORE_ISSUER_NAME);
+ for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) {
+ GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
+ if (gen->type != GEN_DIRNAME)
+ continue;
+ if (!X509_NAME_cmp(gen->d.directoryName, nm))
+ return 1;
+ }
+ return 0;
+}
+
+/* Check CRLDP and IDP */
+
+static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
+ unsigned int *preasons)
+{
+ int i;
+ if (crl->idp_flags & IDP_ONLYATTR)
+ return 0;
+ if (x->ex_flags & EXFLAG_CA) {
+ if (crl->idp_flags & IDP_ONLYUSER)
+ return 0;
+ } else {
+ if (crl->idp_flags & IDP_ONLYCA)
+ return 0;
+ }
+ *preasons = crl->idp_reasons;
+ for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++) {
+ DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
+ if (crldp_check_crlissuer(dp, crl, crl_score)) {
+ if (!crl->idp || idp_check_dp(dp->distpoint, crl->idp->distpoint)) {
+ *preasons &= dp->dp_reasons;
+ return 1;
+ }
+ }
+ }
+ if ((!crl->idp || !crl->idp->distpoint)
+ && (crl_score & CRL_SCORE_ISSUER_NAME))
+ return 1;
+ return 0;
+}
+
+/*
+ * Retrieve CRL corresponding to current certificate. If deltas enabled try
+ * to find a delta CRL too