CVE-2022-4254 (published 2023-02-01T17:15Z)

sssd: libsss_certmap fails to sanitise certificate data used in LDAP filters

CVSS v3 base score: 8.8, HIGH (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Weakness information:
cwe_id: CWE-90
cwe_name: Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
description: The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.
extended_description: 
            
         
         

Fix information:
repo_url: https://github.com/SSSD/sssd
commit_details: repo_url: https://github.com/SSSD/sssd
author: Sumit Bose
author_date: 2019-12-09 11:31:14+01:00
msg: certmap: sanitize LDAP search filter

The sss_certmap_get_search_filter() will now sanitize the values read
from the certificates before adding them to a search filter. To be able
to get the plain values as well sss_certmap_expand_mapping_rule() is
added.

Resolves:
https://github.com/SSSD/sssd/issues/5135

Reviewed-by: Alexey Tikhonov <atikhono@redhat.com>
repository: repo_url: https://github.com/SSSD/sssd
repo_name: SSSD/sssd
description: A daemon to manage identity, authentication and authorization for centrally-managed systems.
repo_language: C
owner: SSSD
file_changes: filename: Makefile.am
change_type: ModificationType.MODIFY
diff: @@ -2163,7 +2163,7 @@ libsss_certmap_la_LIBADD = \
     $(NULL)
 libsss_certmap_la_LDFLAGS = \
     -Wl,--version-script,$(srcdir)/src/lib/certmap/sss_certmap.exports \
-    -version-info 1:0:1
+    -version-info 2:0:2
 
 if HAVE_NSS
 libsss_certmap_la_SOURCES += \

programming_language: Batchfile
filename: sss_certmap.c
change_type: ModificationType.MODIFY
diff: @@ -441,10 +441,12 @@ static int expand_san(struct sss_certmap_ctx *ctx,
 static int expand_template(struct sss_certmap_ctx *ctx,
                            struct parsed_template *parsed_template,
                            struct sss_cert_content *cert_content,
+                           bool sanitize,
                            char **expanded)
 {
     int ret;
     char *exp = NULL;
+    char *exp_sanitized = NULL;
 
     if (strcmp("issuer_dn", parsed_template->name) == 0) {
         ret = rdn_list_2_dn_str(ctx, parsed_template->conversion,
@@ -455,6 +457,8 @@ static int expand_template(struct sss_certmap_ctx *ctx,
     } else if (strncmp("subject_", parsed_template->name, 8) == 0) {
         ret = expand_san(ctx, parsed_template, cert_content->san_list, &exp);
     } else if (strcmp("cert", parsed_template->name) == 0) {
+        /* cert blob is already sanitized */
+        sanitize = false;
         ret = expand_cert(ctx, parsed_template, cert_content, &exp);
     } else {
         CM_DEBUG(ctx, "Unsupported template name.");
@@ -471,6 +475,16 @@ static int expand_template(struct sss_certmap_ctx *ctx,
         goto done;
     }
 
+    if (sanitize) {
+        ret = sss_filter_sanitize(ctx, exp, &exp_sanitized);
+        if (ret != EOK) {
+            CM_DEBUG(ctx, "Failed to sanitize expanded template.");
+            goto done;
+        }
+        talloc_free(exp);
+        exp = exp_sanitized;
+    }
+
     ret = 0;
 
 done:
@@ -485,7 +499,7 @@ done:
 
 static int get_filter(struct sss_certmap_ctx *ctx,
                       struct ldap_mapping_rule *parsed_mapping_rule,
-                      struct sss_cert_content *cert_content,
+                      struct sss_cert_content *cert_content, bool sanitize,
                       char **filter)
 {
     struct ldap_mapping_rule_comp *comp;
@@ -503,7 +517,7 @@ static int get_filter(struct sss_certmap_ctx *ctx,
             result = talloc_strdup_append(result, comp->val);
         } else if (comp->type == comp_template) {
             ret = expand_template(ctx, comp->parsed_template, cert_content,
-                                  &expanded);
+                                  sanitize, &expanded);
             if (ret != 0) {
                 CM_DEBUG(ctx, "Failed to expanded template.");
                 goto done;
@@ -791,8 +805,9 @@ done:
     return ret;
 }
 
-int sss_certmap_get_search_filter(struct sss_certmap_ctx *ctx,
+static int expand_mapping_rule_ex(struct sss_certmap_ctx *ctx,
                                   const uint8_t *der_cert, size_t der_size,
+                                  bool sanitize,
                                   char **_filter, char ***_domains)
 {
     int ret;
@@ -819,7 +834,8 @@ int sss_certmap_get_search_filter(struct sss_certmap_ctx *ctx,
             return EINVAL;
         }
 
-        ret = get_filter(ctx, ctx->default_mapping_rule, cert_content, &filter);
+        ret = get_filter(ctx, ctx->default_mapping_rule, cert_content, sanitize,
+                         &filter);
         goto done;
     }
 
@@ -829,7 +845,7 @@ int sss_certmap_get_search_filter(struct sss_certmap_ctx *ctx,
             if (ret == 0) {
                 /* match */
                 ret = get_filter(ctx, r->parsed_mapping_rule, cert_content,
-                                 &filter);
+                                 sanitize, &filter);
                 if (ret != 0) {
                     CM_DEBUG(ctx, "Failed to get filter");
                     goto done;
@@ -873,6 +889,22 @@ done:
     return ret;
 }
 
+int sss_certmap_get_search_filter(struct sss_certmap_ctx *ctx,
+                                  const uint8_t *der_cert, size_t der_size,
+                                  char **_filter, char ***_domains)
+{
+    return expand_mapping_rule_ex(ctx, der_cert, der_size, true,
+                                  _filter, _domains);
+}
+
+int sss_certmap_expand_mapping_rule(struct sss_certmap_ctx *ctx,
+                                    const uint8_t *der_cert, size_t der_size,
+                                    char **_expanded, char ***_domains)
+{
+    return expand_mapping_rule_ex(ctx, der_cert, der_size, false,
+                                  _expanded, _domains);
+}
+
 int sss_certmap_init(TALLOC_CTX *mem_ctx,
                      sss_certmap_ext_debug *debug, void *debug_priv,
                      struct sss_certmap_ctx **ctx)

programming_language: C
filename: sss_certmap.exports
change_type: ModificationType.MODIFY
diff: @@ -16,3 +16,8 @@ SSS_CERTMAP_0.1 {
     global:
         sss_certmap_display_cert_content;
 } SSS_CERTMAP_0.0;
+
+SSS_CERTMAP_0.2 {
+    global:
+        sss_certmap_expand_mapping_rule;
+} SSS_CERTMAP_0.1;

programming_language: CSS
filename: sss_certmap.h
change_type: ModificationType.MODIFY
diff: @@ -103,7 +103,7 @@ int sss_certmap_add_rule(struct sss_certmap_ctx *ctx,
  *
  * @param[in] ctx      certmap context previously initialized with
  *                     @ref sss_certmap_init
- * @param[in] der_cert binary blog with the DER encoded certificate
+ * @param[in] der_cert binary blob with the DER encoded certificate
  * @param[in] der_size size of the certificate blob
  *
  * @return
@@ -119,10 +119,11 @@ int sss_certmap_match_cert(struct sss_certmap_ctx *ctx,
  *
  * @param[in] ctx      certmap context previously initialized with
  *                     @ref sss_certmap_init
- * @param[in] der_cert binary blog with the DER encoded certificate
+ * @param[in] der_cert binary blob with the DER encoded certificate
  * @param[in] der_size size of the certificate blob
- * @param[out] filter  LDAP filter string, caller should free the data by
- *                     calling sss_certmap_free_filter_and_domains
+ * @param[out] filter  LDAP filter string, expanded templates are sanitized,
+ *                     caller should free the data by calling
+ *                     sss_certmap_free_filter_and_domains
  * @param[out] domains NULL-terminated array of strings with the domains the
  *                     rule applies, caller should free the data by calling
  *                     sss_certmap_free_filter_and_domains
@@ -136,8 +137,32 @@ int sss_certmap_get_search_filter(struct sss_certmap_ctx *ctx,
                                   const uint8_t *der_cert, size_t der_size,
                                   char **filter, char ***domains);
 
+/**
+ * @brief Expand the mapping rule by replacing the templates
+ *
+ * @param[in] ctx        certmap context previously initialized with
+ *                       @ref sss_certmap_init
+ * @param[in] der_cert   binary blob with the DER encoded certificate
+ * @param[in] der_size   size of the certificate blob
+ * @param[out] expanded  expanded mapping rule, templates are filled in
+ *                       verbatim in contrast to sss_certmap_get_search_filter,
+ *                       caller should free the data by
+ *                       calling sss_certmap_free_filter_and_domains
+ * @param[out] domains   NULL-terminated array of strings with the domains the
+ *                       rule applies, caller should free the data by calling
+ *                       sss_certmap_free_filter_and_domains
+ *
+ * @return
+ *  - 0:      certificate matches a rule
+ *  - ENOENT: certificate does not match
+ *  - EINVAL: internal error
+ */
+int sss_certmap_expand_mapping_rule(struct sss_certmap_ctx *ctx,
+                                    const uint8_t *der_cert, size_t der_size,
+                                    char **_expanded, char ***_domains);
 /**
  * @brief Free data returned by @ref sss_certmap_get_search_filter
+ *        and @ref sss_certmap_expand_mapping_rule
  *
  * @param[in] filter  LDAP filter strings returned by
  *                    sss_certmap_get_search_filter
@@ -150,7 +175,7 @@ void sss_certmap_free_filter_and_domains(char *filter, char **domains);
  * @brief Get a string with the content of the certificate used by the library
  *
  * @param[in]  mem_ctx    Talloc memory context, may be NULL
- * @param[in]  der_cert   binary blog with the DER encoded certificate
+ * @param[in]  der_cert   binary blob with the DER encoded certificate
  * @param[in]  der_size   size of the certificate blob
  * @param[out] desc       Multiline string showing the certificate content
  *                        which is used by libsss_certmap

programming_language: C
filename: pamsrv_p11.c
change_type: ModificationType.MODIFY
diff: @@ -1049,9 +1049,10 @@ static char *get_cert_prompt(TALLOC_CTX *mem_ctx,
         goto done;
     }
 
-    ret = sss_certmap_get_search_filter(ctx, der, der_size, &filter, &domains);
+    ret = sss_certmap_expand_mapping_rule(ctx, der, der_size,
+                                          &filter, &domains);
     if (ret != 0) {
-        DEBUG(SSSDBG_OP_FAILURE, "sss_certmap_get_search_filter failed.\n");
+        DEBUG(SSSDBG_OP_FAILURE, "sss_certmap_expand_mapping_rule failed.\n");
         goto done;
     }
 

programming_language: C
filename: test_certmap.c
change_type: ModificationType.MODIFY
diff: @@ -1431,6 +1431,15 @@ static void test_sss_certmap_get_search_filter(void **state)
                                         &filter, &domains);
     assert_int_equal(ret, 0);
     assert_non_null(filter);
+    assert_string_equal(filter, "rule100=<I>CN=Certificate\\20Authority,O=IPA.DEVEL"
+                                "<S>CN=ipa-devel.ipa.devel,O=IPA.DEVEL");
+    assert_null(domains);
+
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert_der),
+                                          sizeof(test_cert_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
     assert_string_equal(filter, "rule100=<I>CN=Certificate Authority,O=IPA.DEVEL"
                                 "<S>CN=ipa-devel.ipa.devel,O=IPA.DEVEL");
     assert_null(domains);
@@ -1445,6 +1454,17 @@ static void test_sss_certmap_get_search_filter(void **state)
                                         &filter, &domains);
     assert_int_equal(ret, 0);
     assert_non_null(filter);
+    assert_string_equal(filter, "rule99=<I>CN=Certificate\\20Authority,O=IPA.DEVEL"
+                                "<S>CN=ipa-devel.ipa.devel,O=IPA.DEVEL");
+    assert_non_null(domains);
+    assert_string_equal(domains[0], "test.dom");
+    assert_null(domains[1]);
+
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert_der),
+                                          sizeof(test_cert_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
     assert_string_equal(filter, "rule99=<I>CN=Certificate Authority,O=IPA.DEVEL"
                                 "<S>CN=ipa-devel.ipa.devel,O=IPA.DEVEL");
     assert_non_null(domains);
@@ -1466,6 +1486,16 @@ static void test_sss_certmap_get_search_filter(void **state)
     assert_string_equal(domains[0], "test.dom");
     assert_null(domains[1]);
 
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert_der),
+                                          sizeof(test_cert_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
+    assert_string_equal(filter, "rule98=userCertificate;binary=" TEST_CERT_BIN);
+    assert_non_null(domains);
+    assert_string_equal(domains[0], "test.dom");
+    assert_null(domains[1]);
+
     ret = sss_certmap_add_rule(ctx, 97,
                             "KRB5:<ISSUER>CN=Certificate Authority,O=IPA.DEVEL",
                             "LDAP:rule97=<I>{issuer_dn!nss_x500}<S>{subject_dn}",
@@ -1476,6 +1506,17 @@ static void test_sss_certmap_get_search_filter(void **state)
                                         &filter, &domains);
     assert_int_equal(ret, 0);
     assert_non_null(filter);
+    assert_string_equal(filter, "rule97=<I>O=IPA.DEVEL,CN=Certificate\\20Authority"
+                                "<S>CN=ipa-devel.ipa.devel,O=IPA.DEVEL");
+    assert_non_null(domains);
+    assert_string_equal(domains[0], "test.dom");
+    assert_null(domains[1]);
+
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert_der),
+                                          sizeof(test_cert_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
     assert_string_equal(filter, "rule97=<I>O=IPA.DEVEL,CN=Certificate Authority"
                                 "<S>CN=ipa-devel.ipa.devel,O=IPA.DEVEL");
     assert_non_null(domains);
@@ -1492,6 +1533,17 @@ static void test_sss_certmap_get_search_filter(void **state)
                                         &filter, &domains);
     assert_int_equal(ret, 0);
     assert_non_null(filter);
+    assert_string_equal(filter, "rule96=<I>O=IPA.DEVEL,CN=Certificate\\20Authority"
+                                "<S>O=IPA.DEVEL,CN=ipa-devel.ipa.devel");
+    assert_non_null(domains);
+    assert_string_equal(domains[0], "test.dom");
+    assert_null(domains[1]);
+
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert_der),
+                                          sizeof(test_cert_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
     assert_string_equal(filter, "rule96=<I>O=IPA.DEVEL,CN=Certificate Authority"
                                 "<S>O=IPA.DEVEL,CN=ipa-devel.ipa.devel");
     assert_non_null(domains);
@@ -1510,6 +1562,14 @@ static void test_sss_certmap_get_search_filter(void **state)
     assert_string_equal(filter, "(userCertificate;binary=" TEST_CERT_BIN ")");
     assert_null(domains);
 
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert_der),
+                                          sizeof(test_cert_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
+    assert_string_equal(filter, "(userCertificate;binary=" TEST_CERT_BIN ")");
+    assert_null(domains);
+
     ret = sss_certmap_add_rule(ctx, 94,
                       "KRB5:<ISSUER>CN=Certificate Authority,O=IPA.DEVEL",
                       "LDAP:rule94=<I>{issuer_dn!ad_x500}<S>{subject_dn!ad_x500}",
@@ -1520,12 +1580,22 @@ static void test_sss_certmap_get_search_filter(void **state)
                                         &filter, &domains);
     assert_int_equal(ret, 0);
     assert_non_null(filter);
-    assert_string_equal(filter, "rule94=<I>O=IPA.DEVEL,CN=Certificate Authority"
+    assert_string_equal(filter, "rule94=<I>O=IPA.DEVEL,CN=Certificate\\20Authority"
                                 "<S>O=IPA.DEVEL,CN=ipa-devel.ipa.devel");
     assert_non_null(domains);
     assert_string_equal(domains[0], "test.dom");
     assert_null(domains[1]);
 
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert_der),
+                                          sizeof(test_cert_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
+    assert_string_equal(filter, "rule94=<I>O=IPA.DEVEL,CN=Certificate Authority"
+                                "<S>O=IPA.DEVEL,CN=ipa-devel.ipa.devel");
+    assert_non_null(domains);
+    assert_string_equal(domains[0], "test.dom");
+    assert_null(domains[1]);
 
     ret = sss_certmap_add_rule(ctx, 89, NULL,
                             "(rule89={subject_nt_principal})",
@@ -1539,6 +1609,14 @@ static void test_sss_certmap_get_search_filter(void **state)
     assert_string_equal(filter, "(rule89=tu1@ad.devel)");
     assert_null(domains);
 
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert2_der),
+                                          sizeof(test_cert2_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
+    assert_string_equal(filter, "(rule89=tu1@ad.devel)");
+    assert_null(domains);
+
     ret = sss_certmap_add_rule(ctx, 88, NULL,
                             "(rule88={subject_nt_principal.short_name})",
                             NULL);
@@ -1560,6 +1638,15 @@ static void test_sss_certmap_get_search_filter(void **state)
                                         &filter, &domains);
     assert_int_equal(ret, 0);
     assert_non_null(filter);
+    assert_string_equal(filter, "rule87=<I>DC=devel,DC=ad,CN=ad-AD-SERVER-CA"
+                  "<S>DC=devel,DC=ad,CN=Users,CN=t\\20u,E=test.user@email.domain");
+    assert_null(domains);
+
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert2_der),
+                                          sizeof(test_cert2_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
     assert_string_equal(filter, "rule87=<I>DC=devel,DC=ad,CN=ad-AD-SERVER-CA"
                   "<S>DC=devel,DC=ad,CN=Users,CN=t u,E=test.user@email.domain");
     assert_null(domains);
@@ -1573,6 +1660,15 @@ static void test_sss_certmap_get_search_filter(void **state)
                                         &filter, &domains);
     assert_int_equal(ret, 0);
     assert_non_null(filter);
+    assert_string_equal(filter, "rule86=<I>DC=devel,DC=ad,CN=ad-AD-SERVER-CA"
+                  "<S>DC=devel,DC=ad,CN=Users,CN=t\\20u,E=test.user@email.domain");
+    assert_null(domains);
+
+    ret = sss_certmap_expand_mapping_rule(ctx, discard_const(test_cert2_der),
+                                          sizeof(test_cert2_der),
+                                          &filter, &domains);
+    assert_int_equal(ret, 0);
+    assert_non_null(filter);
     assert_string_equal(filter, "rule86=<I>DC=devel,DC=ad,CN=ad-AD-SERVER-CA"
                   "<S>DC=devel,DC=ad,CN=Users,CN=t u,E=test.user@email.domain");
     assert_null(domains);

programming_language: C
filename: util.c
change_type: ModificationType.MODIFY
diff: @@ -436,100 +436,6 @@ errno_t sss_hash_create(TALLOC_CTX *mem_ctx, unsigned long count,
     return sss_hash_create_ex(mem_ctx, count, tbl, 0, 0, 0, 0, NULL, NULL);
 }
 
-errno_t sss_filter_sanitize_ex(TALLOC_CTX *mem_ctx,
-                               const char *input,
-                               char **sanitized,
-                               const char *ignore)
-{
-    char *output;
-    size_t i = 0;
-    size_t j = 0;
-    char *allowed;
-
-    /* Assume the worst-case. We'll resize it later, once */
-    output = talloc_array(mem_ctx, char, strlen(input) * 3 + 1);
-    if (!output) {
-        return ENOMEM;
-    }
-
-    while (input[i]) {
-        /* Even though this character might have a special meaning, if it's
-         * explicitly allowed, just copy it and move on
-         */
-        if (ignore == NULL) {
-            allowed = NULL;
-        } else {
-            allowed = strchr(ignore, input[i]);
-        }
-        if (allowed) {
-            output[j++] = input[i++];
-            continue;
-        }
-
-        switch(input[i]) {
-        case '\t':
-            output[j++] = '\\';
-            output[j++] = '0';
-            output[j++] = '9';
-            break;
-        case ' ':
-            output[j++] = '\\';
-            output[j++] = '2';
-            output[j++] = '0';
-            break;
-        case '*':
-            output[j++] = '\\';
-            output[j++] = '2';
-            output[j++] = 'a';
-            break;
-        case '(':
-            output[j++] = '\\';
-            output[j++] = '2';
-            output[j++] = '8';
-            break;
-        case ')':
-            output[j++] = '\\';
-            output[j++] = '2';
-            output[j++] = '9';
-            break;
-        case '\\':
-            output[j++] = '\\';
-            output[j++] = '5';
-            output[j++] = 'c';
-            break;
-        case '\r':
-            output[j++] = '\\';
-            output[j++] = '0';
-            output[j++] = 'd';
-            break;
-        case '\n':
-            output[j++] = '\\';
-            output[j++] = '0';
-            output[j++] = 'a';
-            break;
-        default:
-            output[j++] = input[i];
-        }
-
-        i++;
-    }
-    output[j] = '\0';
-    *sanitized = talloc_realloc(mem_ctx, output, char, j+1);
-    if (!*sanitized) {
-        talloc_free(output);
-        return ENOMEM;
-    }
-
-    return EOK;
-}
-
-errno_t sss_filter_sanitize(TALLOC_CTX *mem_ctx,
-                            const char *input,
-                            char **sanitized)
-{
-    return sss_filter_sanitize_ex(mem_ctx, input, sanitized, NULL);
-}
-
 char *
 sss_escape_ip_address(TALLOC_CTX *mem_ctx, int family, const char *addr)
 {

programming_language: C
filename: util_ext.c
change_type: ModificationType.MODIFY
diff: @@ -29,6 +29,11 @@
 
 #define EOK 0
 
+#ifndef HAVE_ERRNO_T
+#define HAVE_ERRNO_T
+typedef int errno_t;
+#endif
+
 int split_on_separator(TALLOC_CTX *mem_ctx, const char *str,
                        const char sep, bool trim, bool skip_empty,
                        char ***_list, int *size)
@@ -141,3 +146,97 @@ bool string_in_list(const char *string, char **list, bool case_sensitive)
 
     return false;
 }
+
+errno_t sss_filter_sanitize_ex(TALLOC_CTX *mem_ctx,
+                               const char *input,
+                               char **sanitized,
+                               const char *ignore)
+{
+    char *output;
+    size_t i = 0;
+    size_t j = 0;
+    char *allowed;
+
+    /* Assume the worst-case. We'll resize it later, once */
+    output = talloc_array(mem_ctx, char, strlen(input) * 3 + 1);
+    if (!output) {
+        return ENOMEM;
+    }
+
+    while (input[i]) {
+        /* Even though this character might have a special meaning, if it's
+         * explicitly allowed, just copy it and move on
+         */
+        if (ignore == NULL) {
+            allowed = NULL;
+        } else {
+            allowed = strchr(ignore, input[i]);
+        }
+        if (allowed) {
+            output[j++] = input[i++];
+            continue;
+        }
+
+        switch(input[i]) {
+        case '\t':
+            output[j++] = '\\';
+            output[j++] = '0';
+            output[j++] = '9';
+            break;
+        case ' ':
+            output[j++] = '\\';
+            output[j++] = '2';
+            output[j++] = '0';
+            break;
+        case '*':
+            output[j++] = '\\';
+            output[j++] = '2';
+            output[j++] = 'a';
+            break;
+        case '(':
+            output[j++] = '\\';
+            output[j++] = '2';
+            output[j++] = '8';
+            break;
+        case ')':
+            output[j++] = '\\';
+            output[j++] = '2';
+            output[j++] = '9';
+            break;
+        case '\\':
+            output[j++] = '\\';
+            output[j++] = '5';
+            output[j++] = 'c';
+            break;
+        case '\r':
+            output[j++] = '\\';
+            output[j++] = '0';
+            output[j++] = 'd';
+            break;
+        case '\n':
+            output[j++] = '\\';
+            output[j++] = '0';
+            output[j++] = 'a';
+            break;
+        default:
+            output[j++] = input[i];
+        }
+
+        i++;
+    }
+    output[j] = '\0';
+    *sanitized = talloc_realloc(mem_ctx, output, char, j+1);
+    if (!*sanitized) {
+        talloc_free(output);
+        return ENOMEM;
+    }
+
+    return EOK;
+}
+
+errno_t sss_filter_sanitize(TALLOC_CTX *mem_ctx,
+                            const char *input,
+                            char **sanitized)
+{
+    return sss_filter_sanitize_ex(mem_ctx, input, sanitized, NULL);
+}

programming_language: C