char *ca_cert;
unsigned int crl_reload_interval;
struct os_reltime crl_last_reload;
+ char *check_cert_subject;
};
struct tls_connection {
EVP_PKEY *private_key; /* the private key if using engine */
#endif /* OPENSSL_NO_ENGINE */
char *subject_match, *altsubject_match, *suffix_match, *domain_match;
+ char *check_cert_subject;
int read_alerts, write_alerts, failed;
tls_session_ticket_cb session_ticket_cb;
tls_global = NULL;
}
+ os_free(data->check_cert_subject);
os_free(data);
}
os_free(conn->altsubject_match);
os_free(conn->suffix_match);
os_free(conn->domain_match);
+ os_free(conn->check_cert_subject);
os_free(conn->session_ticket);
os_free(conn);
}
#endif /* CONFIG_NATIVE_WINDOWS */
+struct tls_dn_field_order_cnt {
+ u8 cn;
+ u8 c;
+ u8 l;
+ u8 st;
+ u8 o;
+ u8 ou;
+ u8 email;
+};
+
+
+static int get_dn_field_index(const struct tls_dn_field_order_cnt *dn_cnt,
+ int nid)
+{
+ switch (nid) {
+ case NID_commonName:
+ return dn_cnt->cn;
+ case NID_countryName:
+ return dn_cnt->c;
+ case NID_localityName:
+ return dn_cnt->l;
+ case NID_stateOrProvinceName:
+ return dn_cnt->st;
+ case NID_organizationName:
+ return dn_cnt->o;
+ case NID_organizationalUnitName:
+ return dn_cnt->ou;
+ case NID_pkcs9_emailAddress:
+ return dn_cnt->email;
+ default:
+ wpa_printf(MSG_ERROR,
+ "TLS: Unknown NID '%d' in check_cert_subject",
+ nid);
+ return -1;
+ }
+}
+
+
+/**
+ * match_dn_field - Match configuration DN field against Certificate DN field
+ * @cert: Certificate
+ * @nid: NID of DN field
+ * @field: Field name
+ * @value DN field value which is passed from configuration
+ * e.g., if configuration have C=US and this argument will point to US.
+ * @dn_cnt: DN matching context
+ * Returns: 1 on success and 0 on failure
+ */
+static int match_dn_field(const X509 *cert, int nid, const char *field,
+ const char *value,
+ const struct tls_dn_field_order_cnt *dn_cnt)
+{
+ int i, ret = 0, len, config_dn_field_index, match_index = 0;
+ X509_NAME *name;
+
+ len = os_strlen(value);
+ name = X509_get_subject_name(cert);
+
+ /* Assign incremented cnt for every field of DN to check DN field in
+ * right order */
+ config_dn_field_index = get_dn_field_index(dn_cnt, nid);
+ if (config_dn_field_index < 0)
+ return 0;
+
+ /* Fetch value based on NID */
+ for (i = -1; (i = X509_NAME_get_index_by_NID(name, nid, i)) > -1;) {
+ X509_NAME_ENTRY *e;
+ ASN1_STRING *cn;
+
+ e = X509_NAME_get_entry(name, i);
+ if (!e)
+ continue;
+
+ cn = X509_NAME_ENTRY_get_data(e);
+ if (!cn)
+ continue;
+
+ match_index++;
+
+ /* check for more than one DN field with same name */
+ if (match_index != config_dn_field_index)
+ continue;
+
+ /* Check wildcard at the right end side */
+ /* E.g., if OU=develop* mentioned in configuration, allow 'OU'
+ * of the subject in the client certificate to start with
+ * 'develop' */
+ if (len > 0 && value[len - 1] == '*') {
+ /* Compare actual certificate DN field value with
+ * configuration DN field value up to the specified
+ * length. */
+ ret = ASN1_STRING_length(cn) >= len - 1 &&
+ os_memcmp(ASN1_STRING_get0_data(cn), value,
+ len - 1) == 0;
+ } else {
+ /* Compare actual certificate DN field value with
+ * configuration DN field value */
+ ret = ASN1_STRING_length(cn) == len &&
+ os_memcmp(ASN1_STRING_get0_data(cn), value,
+ len) == 0;
+ }
+ if (!ret) {
+ wpa_printf(MSG_ERROR,
+ "OpenSSL: Failed to match %s '%s' with certificate DN field value '%s'",
+ field, value, ASN1_STRING_get0_data(cn));
+ }
+ break;
+ }
+
+ return ret;
+}
+
+
+/**
+ * get_value_from_field - Get value from DN field
+ * @cert: Certificate
+ * @field_str: DN field string which is passed from configuration file (e.g.,
+ * C=US)
+ * @dn_cnt: DN matching context
+ * Returns: 1 on success and 0 on failure
+ */
+static int get_value_from_field(const X509 *cert, char *field_str,
+ struct tls_dn_field_order_cnt *dn_cnt)
+{
+ int nid;
+ char *context = NULL, *name, *value;
+
+ if (os_strcmp(field_str, "*") == 0)
+ return 1; /* wildcard matches everything */
+
+ name = str_token(field_str, "=", &context);
+ if (!name)
+ return 0;
+
+ /* Compare all configured DN fields and assign nid based on that to
+ * fetch correct value from certificate subject */
+ if (os_strcmp(name, "CN") == 0) {
+ nid = NID_commonName;
+ dn_cnt->cn++;
+ } else if(os_strcmp(name, "C") == 0) {
+ nid = NID_countryName;
+ dn_cnt->c++;
+ } else if (os_strcmp(name, "L") == 0) {
+ nid = NID_localityName;
+ dn_cnt->l++;
+ } else if (os_strcmp(name, "ST") == 0) {
+ nid = NID_stateOrProvinceName;
+ dn_cnt->st++;
+ } else if (os_strcmp(name, "O") == 0) {
+ nid = NID_organizationName;
+ dn_cnt->o++;
+ } else if (os_strcmp(name, "OU") == 0) {
+ nid = NID_organizationalUnitName;
+ dn_cnt->ou++;
+ } else if (os_strcmp(name, "emailAddress") == 0) {
+ nid = NID_pkcs9_emailAddress;
+ dn_cnt->email++;
+ } else {
+ wpa_printf(MSG_ERROR,
+ "TLS: Unknown field '%s' in check_cert_subject", name);
+ return 0;
+ }
+
+ value = str_token(field_str, "=", &context);
+ if (!value) {
+ wpa_printf(MSG_ERROR,
+ "TLS: Distinguished Name field '%s' value is not defined in check_cert_subject",
+ name);
+ return 0;
+ }
+
+ return match_dn_field(cert, nid, name, value, dn_cnt);
+}
+
+
+/**
+ * tls_match_dn_field - Match subject DN field with check_cert_subject
+ * @cert: Certificate
+ * @match: check_cert_subject string
+ * Returns: Return 1 on success and 0 on failure
+*/
+static int tls_match_dn_field(X509 *cert, const char *match)
+{
+ const char *token, *last = NULL;
+ char field[256];
+ struct tls_dn_field_order_cnt dn_cnt;
+
+ os_memset(&dn_cnt, 0, sizeof(dn_cnt));
+
+ /* Maximum length of each DN field is 255 characters */
+
+ /* Process each '/' delimited field */
+ while ((token = cstr_token(match, "/", &last))) {
+ if (last - token >= (int) sizeof(field)) {
+ wpa_printf(MSG_ERROR,
+ "OpenSSL: Too long DN matching field value in '%s'",
+ match);
+ return 0;
+ }
+ os_memcpy(field, token, last - token);
+ field[last - token] = '\0';
+
+ if (!get_value_from_field(cert, field, &dn_cnt)) {
+ wpa_printf(MSG_DEBUG, "OpenSSL: No match for DN '%s'",
+ field);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+
static int tls_match_suffix(X509 *cert, const char *match, int full)
{
#ifdef CONFIG_NATIVE_WINDOWS
struct tls_connection *conn;
struct tls_context *context;
char *match, *altmatch, *suffix_match, *domain_match;
+ const char *check_cert_subject;
const char *err_str;
err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
"err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
preverify_ok, err, err_str,
conn->ca_cert_verify, depth, buf);
+ check_cert_subject = conn->check_cert_subject;
+ if (!check_cert_subject)
+ check_cert_subject = conn->data->check_cert_subject;
+ if (check_cert_subject) {
+ if (depth == 0 &&
+ !tls_match_dn_field(err_cert, check_cert_subject)) {
+ preverify_ok = 0;
+ openssl_tls_fail_event(conn, err_cert, err, depth, buf,
+ "Distinguished Name",
+ TLS_FAIL_DN_MISMATCH);
+ }
+ }
if (depth == 0 && match && os_strstr(buf, match) == NULL) {
wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
"match with '%s'", buf, match);
const char *subject_match,
const char *altsubject_match,
const char *suffix_match,
- const char *domain_match)
+ const char *domain_match,
+ const char *check_cert_subject)
{
os_free(conn->subject_match);
conn->subject_match = NULL;
return -1;
}
+ os_free(conn->check_cert_subject);
+ conn->check_cert_subject = NULL;
+ if (check_cert_subject) {
+ conn->check_cert_subject = os_strdup(check_cert_subject);
+ if (!conn->check_cert_subject)
+ return -1;
+ }
+
return 0;
}
params->subject_match,
params->altsubject_match,
params->suffix_match,
- params->domain_match))
+ params->domain_match,
+ params->check_cert_subject))
return -1;
if (engine_id && ca_cert_id) {
__func__, ERR_error_string(err, NULL));
}
+ os_free(data->check_cert_subject);
+ data->check_cert_subject = NULL;
+ if (params->check_cert_subject) {
+ data->check_cert_subject =
+ os_strdup(params->check_cert_subject);
+ if (!data->check_cert_subject)
+ return -1;
+ }
+
if (tls_global_ca_cert(data, params->ca_cert) ||
tls_global_client_cert(data, params->client_cert) ||
tls_global_private_key(data, params->private_key,
*/
char *subject_match;
+ /**
+ * check_cert_subject - Constraint for server certificate subject fields
+ *
+ * If check_cert_subject is set, the value of every field will be
+ * checked against the DN of the subject in the authentication server
+ * certificate. If the values do not match, the certificate verification
+ * will fail, rejecting the server. This option allows wpa_supplicant to
+ * match every individual field in the right order against the DN of the
+ * subject in the server certificate.
+ *
+ * For example, check_cert_subject=C=US/O=XX/OU=ABC/OU=XYZ/CN=1234 will
+ * check every individual DN field of the subject in the server
+ * certificate. If OU=XYZ comes first in terms of the order in the
+ * server certificate (DN field of server certificate
+ * C=US/O=XX/OU=XYZ/OU=ABC/CN=1234), wpa_supplicant will reject the
+ * server because the order of 'OU' is not matching the specified string
+ * in check_cert_subject.
+ *
+ * This option also allows '*' as a wildcard. This option has some
+ * limitation.
+ * It can only be used as per the following example.
+ *
+ * For example, check_cert_subject=C=US/O=XX/OU=Production* and we have
+ * two servers and DN of the subject in the first server certificate is
+ * (C=US/O=XX/OU=Production Unit) and DN of the subject in the second
+ * server is (C=US/O=XX/OU=Production Factory). In this case,
+ * wpa_supplicant will allow both servers because the value of 'OU'
+ * field in both server certificates matches 'OU' value in
+ * 'check_cert_subject' up to 'wildcard'.
+ *
+ * (Allow all servers, e.g., check_cert_subject=*)
+ */
+ char *check_cert_subject;
+
+ /**
+ * check_cert_subject2 - Constraint for server certificate subject fields
+ *
+ * This field is like check_cert_subject, but used for phase 2 (inside
+ * EAP-TTLS/PEAP/FAST tunnel) authentication.
+ */
+ char *check_cert_subject2;
+
/**
* altsubject_match - Constraint for server certificate alt. subject
*
projects / thirdparty / hostap.git / commitdiff
