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From 27ef368b4105f19382360fe62f944b36ca74adb7 Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Wed, 6 Sep 2017 12:20:25 +0200
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Subject: [PATCH 194/194] certmap: make sure eku_oid_list is always allocated
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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If there are only OIDs in a <EKU> part of a matching rule a NULL pointer
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dereference might occur.
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Related to https://pagure.io/SSSD/sssd/issue/3508
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Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>
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Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
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(cherry picked from commit f5a8cd60c6f377af1954b58f007d16cf3f6dc846)
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---
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src/lib/certmap/sss_certmap_krb5_match.c | 21 ++++++++++++---------
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src/tests/cmocka/test_certmap.c | 17 +++++++++++++++++
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2 files changed, 29 insertions(+), 9 deletions(-)
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diff --git a/src/lib/certmap/sss_certmap_krb5_match.c b/src/lib/certmap/sss_certmap_krb5_match.c
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index e40f17b8ace46e61087e0a2fa570a362a84cead2..0a77ac225d73f3506e102fdbdc9084faa0f19cf0 100644
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--- a/src/lib/certmap/sss_certmap_krb5_match.c
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+++ b/src/lib/certmap/sss_certmap_krb5_match.c
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@@ -179,19 +179,17 @@ static int parse_krb5_get_eku_value(TALLOC_CTX *mem_ctx,
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goto done;
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}
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+ comp->eku_oid_list = talloc_zero_array(comp, const char *,
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+ eku_list_size + 1);
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+ if (comp->eku_oid_list == NULL) {
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+ ret = ENOMEM;
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+ goto done;
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+ }
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+
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for (c = 0; eku_list[c] != NULL; c++) {
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for (k = 0; ext_key_usage[k].name != NULL; k++) {
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CM_DEBUG(ctx, "[%s][%s].", eku_list[c], ext_key_usage[k].name);
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if (strcasecmp(eku_list[c], ext_key_usage[k].name) == 0) {
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- if (comp->eku_oid_list == NULL) {
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- comp->eku_oid_list = talloc_zero_array(comp, const char *,
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- eku_list_size + 1);
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- if (comp->eku_oid_list == NULL) {
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- ret = ENOMEM;
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- goto done;
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- }
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- }
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-
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comp->eku_oid_list[e] = talloc_strdup(comp->eku_oid_list,
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ext_key_usage[k].oid);
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if (comp->eku_oid_list[e] == NULL) {
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@@ -225,6 +223,11 @@ CM_DEBUG(ctx, "[%s][%s].", eku_list[c], ext_key_usage[k].name);
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}
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}
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+ if (e == 0) {
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+ talloc_free(comp->eku_oid_list);
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+ comp->eku_oid_list = NULL;
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+ }
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+
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ret = 0;
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done:
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diff --git a/src/tests/cmocka/test_certmap.c b/src/tests/cmocka/test_certmap.c
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index c998443d086eaa72cc2a05c38ddfc5ba590a1ce7..e732bb214476943d0f723b318ab64d3b4156cace 100644
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--- a/src/tests/cmocka/test_certmap.c
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+++ b/src/tests/cmocka/test_certmap.c
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@@ -445,6 +445,23 @@ static void test_sss_certmap_add_matching_rule(void **state)
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assert_null(
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ctx->prio_list->rule_list->parsed_match_rule->eku->eku_oid_list[3]);
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+ ret = sss_certmap_add_rule(ctx, 96,
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+ "KRB5:<EKU>1.2.3",
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+ NULL, NULL);
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+ assert_int_equal(ret, 0);
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+ assert_non_null(ctx->prio_list);
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+ assert_non_null(ctx->prio_list->rule_list);
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+ assert_non_null(ctx->prio_list->rule_list->parsed_match_rule);
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+ assert_int_equal(ctx->prio_list->rule_list->parsed_match_rule->r,
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+ relation_and);
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+ assert_non_null(ctx->prio_list->rule_list->parsed_match_rule->eku);
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+ assert_true(string_in_list("1.2.3",
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+ discard_const(
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+ ctx->prio_list->rule_list->parsed_match_rule->eku->eku_oid_list),
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+ true));
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+ assert_null(
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+ ctx->prio_list->rule_list->parsed_match_rule->eku->eku_oid_list[1]);
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+
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/* SAN tests */
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ret = sss_certmap_add_rule(ctx, 89, "KRB5:<SAN>abc", NULL, NULL);
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assert_int_equal(ret, 0);
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--
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2.13.5
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