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net-snmp/SOURCES/net-snmp-5.8-intermediate-certs.patch

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import net-snmp-5.8-22.el8
2021-11-09 10:08:22 +00:00
diff -urNp a/include/net-snmp/library/cert_util.h b/include/net-snmp/library/cert_util.h
--- a/include/net-snmp/library/cert_util.h 2021-06-09 10:55:22.767954797 +0200
+++ b/include/net-snmp/library/cert_util.h 2021-06-09 10:56:36.725272293 +0200
@@ -55,7 +55,8 @@ extern "C" {
char *common_name;
u_char hash_type;
- u_char _pad[3]; /* for future use */
+ u_char _pad[1]; /* for future use */
+ u_short offset;
} netsnmp_cert;
/** types */
@@ -100,6 +101,7 @@ extern "C" {
NETSNMP_IMPORT
netsnmp_cert *netsnmp_cert_find(int what, int where, void *hint);
+ netsnmp_void_array *netsnmp_certs_find(int what, int where, void *hint);
int netsnmp_cert_check_vb_fingerprint(const netsnmp_variable_list *var);
diff -urNp a/include/net-snmp/library/dir_utils.h b/include/net-snmp/library/dir_utils.h
--- a/include/net-snmp/library/dir_utils.h 2021-06-09 10:55:22.767954797 +0200
+++ b/include/net-snmp/library/dir_utils.h 2021-06-09 10:56:36.726272298 +0200
@@ -53,6 +53,8 @@ extern "C" {
#define NETSNMP_DIR_NSFILE 0x0010
/** load stats in netsnmp_file */
#define NETSNMP_DIR_NSFILE_STATS 0x0020
+/** allow files to be indexed more than once */
+#define NETSNMP_DIR_ALLOW_DUPLICATES 0x0040
diff -urNp a/snmplib/cert_util.c b/snmplib/cert_util.c
--- a/snmplib/cert_util.c 2021-06-09 10:55:22.785954874 +0200
+++ b/snmplib/cert_util.c 2021-06-09 11:02:43.890848394 +0200
@@ -104,7 +104,7 @@ netsnmp_feature_child_of(tls_fingerprint
* bump this value whenever cert index format changes, so indexes
* will be regenerated with new format.
*/
-#define CERT_INDEX_FORMAT 1
+#define CERT_INDEX_FORMAT 2
static netsnmp_container *_certs = NULL;
static netsnmp_container *_keys = NULL;
@@ -130,6 +130,8 @@ static int _cert_fn_ncompare(netsnmp_ce
netsnmp_cert_common *rhs);
static void _find_partner(netsnmp_cert *cert, netsnmp_key *key);
static netsnmp_cert *_find_issuer(netsnmp_cert *cert);
+static netsnmp_void_array *_cert_reduce_subset_first(netsnmp_void_array *matching);
+static netsnmp_void_array *_cert_reduce_subset_what(netsnmp_void_array *matching, int what);
static netsnmp_void_array *_cert_find_subset_fn(const char *filename,
const char *directory);
static netsnmp_void_array *_cert_find_subset_sn(const char *subject);
@@ -349,6 +351,8 @@ _get_cert_container(const char *use)
{
netsnmp_container *c;
+ int rc;
+
c = netsnmp_container_find("certs:binary_array");
if (NULL == c) {
snmp_log(LOG_ERR, "could not create container for %s\n", use);
@@ -358,6 +362,8 @@ _get_cert_container(const char *use)
c->free_item = (netsnmp_container_obj_func*)_cert_free;
c->compare = (netsnmp_container_compare*)_cert_compare;
+ CONTAINER_SET_OPTIONS(c, CONTAINER_KEY_ALLOW_DUPLICATES, rc);
+
return c;
}
@@ -366,6 +372,8 @@ _setup_containers(void)
{
netsnmp_container *additional_keys;
+ int rc;
+
_certs = _get_cert_container("netsnmp certificates");
if (NULL == _certs)
return;
@@ -380,6 +388,7 @@ _setup_containers(void)
additional_keys->container_name = strdup("certs_cn");
additional_keys->free_item = NULL;
additional_keys->compare = (netsnmp_container_compare*)_cert_cn_compare;
+ CONTAINER_SET_OPTIONS(additional_keys, CONTAINER_KEY_ALLOW_DUPLICATES, rc);
netsnmp_container_add_index(_certs, additional_keys);
/** additional keys: subject name */
@@ -393,6 +402,7 @@ _setup_containers(void)
additional_keys->free_item = NULL;
additional_keys->compare = (netsnmp_container_compare*)_cert_sn_compare;
additional_keys->ncompare = (netsnmp_container_compare*)_cert_sn_ncompare;
+ CONTAINER_SET_OPTIONS(additional_keys, CONTAINER_KEY_ALLOW_DUPLICATES, rc);
netsnmp_container_add_index(_certs, additional_keys);
/** additional keys: file name */
@@ -406,6 +416,7 @@ _setup_containers(void)
additional_keys->free_item = NULL;
additional_keys->compare = (netsnmp_container_compare*)_cert_fn_compare;
additional_keys->ncompare = (netsnmp_container_compare*)_cert_fn_ncompare;
+ CONTAINER_SET_OPTIONS(additional_keys, CONTAINER_KEY_ALLOW_DUPLICATES, rc);
netsnmp_container_add_index(_certs, additional_keys);
_keys = netsnmp_container_find("cert_keys:binary_array");
@@ -428,9 +439,9 @@ netsnmp_cert_map_container(void)
}
static netsnmp_cert *
-_new_cert(const char *dirname, const char *filename, int certType,
- int hashType, const char *fingerprint, const char *common_name,
- const char *subject)
+_new_cert(const char *dirname, const char *filename, int certType, int offset,
+ int allowed_uses, int hashType, const char *fingerprint,
+ const char *common_name, const char *subject)
{
netsnmp_cert *cert;
@@ -450,8 +461,10 @@ _new_cert(const char *dirname, const cha
cert->info.dir = strdup(dirname);
cert->info.filename = strdup(filename);
- cert->info.allowed_uses = NS_CERT_REMOTE_PEER;
+ /* only the first certificate is allowed to be a remote peer */
+ cert->info.allowed_uses = allowed_uses;
cert->info.type = certType;
+ cert->offset = offset;
if (fingerprint) {
cert->hash_type = hashType;
cert->fingerprint = strdup(fingerprint);
@@ -888,14 +901,86 @@ _certindex_new( const char *dirname )
* certificate utility functions
*
*/
+static BIO *
+netsnmp_open_bio(const char *dir, const char *filename)
+{
+ BIO *certbio;
+ char file[SNMP_MAXPATH];
+
+ DEBUGMSGT(("9:cert:read", "Checking file %s\n", filename));
+
+ certbio = BIO_new(BIO_s_file());
+ if (NULL == certbio) {
+ snmp_log(LOG_ERR, "error creating BIO\n");
+ return NULL;
+ }
+
+ snprintf(file, sizeof(file),"%s/%s", dir, filename);
+ if (BIO_read_filename(certbio, file) <=0) {
+ snmp_log(LOG_ERR, "error reading certificate/key %s into BIO\n", file);
+ BIO_vfree(certbio);
+ return NULL;
+ }
+
+ return certbio;
+}
+
+static void
+netsnmp_ocert_parse(netsnmp_cert *cert, X509 *ocert)
+{
+ int is_ca;
+
+ cert->ocert = ocert;
+
+ /*
+ * X509_check_ca return codes:
+ * 0 not a CA
+ * 1 is a CA
+ * 2 basicConstraints absent so "maybe" a CA
+ * 3 basicConstraints absent but self signed V1.
+ * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
+ * 5 outdated Netscape Certificate Type CA extension.
+ */
+ is_ca = X509_check_ca(ocert);
+ if (1 == is_ca)
+ cert->info.allowed_uses |= NS_CERT_CA;
+
+ if (NULL == cert->subject) {
+ cert->subject = X509_NAME_oneline(X509_get_subject_name(ocert), NULL,
+ 0);
+ DEBUGMSGT(("9:cert:add:subject", "subject name: %s\n", cert->subject));
+ }
+
+ if (NULL == cert->issuer) {
+ cert->issuer = X509_NAME_oneline(X509_get_issuer_name(ocert), NULL, 0);
+ if (strcmp(cert->subject, cert->issuer) == 0) {
+ free(cert->issuer);
+ cert->issuer = strdup("self-signed");
+ }
+ DEBUGMSGT(("9:cert:add:issuer", "CA issuer: %s\n", cert->issuer));
+ }
+
+ if (NULL == cert->fingerprint) {
+ cert->hash_type = netsnmp_openssl_cert_get_hash_type(ocert);
+ cert->fingerprint =
+ netsnmp_openssl_cert_get_fingerprint(ocert, cert->hash_type);
+ }
+
+ if (NULL == cert->common_name) {
+ cert->common_name =netsnmp_openssl_cert_get_commonName(ocert, NULL,
+ NULL);
+ DEBUGMSGT(("9:cert:add:name","%s\n", cert->common_name));
+ }
+
+}
+
static X509 *
netsnmp_ocert_get(netsnmp_cert *cert)
{
BIO *certbio;
X509 *ocert = NULL;
+ X509 *ncert = NULL;
EVP_PKEY *okey = NULL;
- char file[SNMP_MAXPATH];
- int is_ca;
if (NULL == cert)
return NULL;
@@ -912,51 +997,33 @@ netsnmp_ocert_get(netsnmp_cert *cert)
}
}
- DEBUGMSGT(("9:cert:read", "Checking file %s\n", cert->info.filename));
-
- certbio = BIO_new(BIO_s_file());
- if (NULL == certbio) {
- snmp_log(LOG_ERR, "error creating BIO\n");
- return NULL;
- }
-
- snprintf(file, sizeof(file),"%s/%s", cert->info.dir, cert->info.filename);
- if (BIO_read_filename(certbio, file) <=0) {
- snmp_log(LOG_ERR, "error reading certificate %s into BIO\n", file);
- BIO_vfree(certbio);
+ certbio = netsnmp_open_bio(cert->info.dir, cert->info.filename);
+ if (!certbio) {
return NULL;
}
- if (NS_CERT_TYPE_UNKNOWN == cert->info.type) {
- char *pos = strrchr(cert->info.filename, '.');
- if (NULL == pos)
- return NULL;
- cert->info.type = _cert_ext_type(++pos);
- netsnmp_assert(cert->info.type != NS_CERT_TYPE_UNKNOWN);
- }
-
switch (cert->info.type) {
case NS_CERT_TYPE_DER:
+ (void)BIO_seek(certbio, cert->offset);
ocert = d2i_X509_bio(certbio,NULL); /* DER/ASN1 */
if (NULL != ocert)
break;
- (void)BIO_reset(certbio);
/* Check for PEM if DER didn't work */
/* FALLTHROUGH */
case NS_CERT_TYPE_PEM:
- ocert = PEM_read_bio_X509_AUX(certbio, NULL, NULL, NULL);
+ (void)BIO_seek(certbio, cert->offset);
+ ocert = ncert = PEM_read_bio_X509_AUX(certbio, NULL, NULL, NULL);
if (NULL == ocert)
break;
if (NS_CERT_TYPE_DER == cert->info.type) {
DEBUGMSGT(("9:cert:read", "Changing type from DER to PEM\n"));
cert->info.type = NS_CERT_TYPE_PEM;
}
- /** check for private key too */
- if (NULL == cert->key) {
- (void)BIO_reset(certbio);
- okey = PEM_read_bio_PrivateKey(certbio, NULL, NULL, NULL);
+ /** check for private key too, but only if we're the first certificate */
+ if (0 == cert->offset && NULL == cert->key) {
+ okey = PEM_read_bio_PrivateKey(certbio, NULL, NULL, NULL);
if (NULL != okey) {
netsnmp_key *key;
DEBUGMSGT(("cert:read:key", "found key with cert in %s\n",
@@ -983,7 +1050,7 @@ netsnmp_ocert_get(netsnmp_cert *cert)
break;
#ifdef CERT_PKCS12_SUPPORT_MAYBE_LATER
case NS_CERT_TYPE_PKCS12:
- (void)BIO_reset(certbio);
+ (void)BIO_seek(certbio, cert->offset);
PKCS12 *p12 = d2i_PKCS12_bio(certbio, NULL);
if ( (NULL != p12) && (PKCS12_verify_mac(p12, "", 0) ||
PKCS12_verify_mac(p12, NULL, 0)))
@@ -1003,46 +1070,7 @@ netsnmp_ocert_get(netsnmp_cert *cert)
return NULL;
}
- cert->ocert = ocert;
- /*
- * X509_check_ca return codes:
- * 0 not a CA
- * 1 is a CA
- * 2 basicConstraints absent so "maybe" a CA
- * 3 basicConstraints absent but self signed V1.
- * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
- * 5 outdated Netscape Certificate Type CA extension.
- */
- is_ca = X509_check_ca(ocert);
- if (1 == is_ca)
- cert->info.allowed_uses |= NS_CERT_CA;
-
- if (NULL == cert->subject) {
- cert->subject = X509_NAME_oneline(X509_get_subject_name(ocert), NULL,
- 0);
- DEBUGMSGT(("9:cert:add:subject", "subject name: %s\n", cert->subject));
- }
-
- if (NULL == cert->issuer) {
- cert->issuer = X509_NAME_oneline(X509_get_issuer_name(ocert), NULL, 0);
- if (strcmp(cert->subject, cert->issuer) == 0) {
- free(cert->issuer);
- cert->issuer = strdup("self-signed");
- }
- DEBUGMSGT(("9:cert:add:issuer", "CA issuer: %s\n", cert->issuer));
- }
-
- if (NULL == cert->fingerprint) {
- cert->hash_type = netsnmp_openssl_cert_get_hash_type(ocert);
- cert->fingerprint =
- netsnmp_openssl_cert_get_fingerprint(ocert, cert->hash_type);
- }
-
- if (NULL == cert->common_name) {
- cert->common_name =netsnmp_openssl_cert_get_commonName(ocert, NULL,
- NULL);
- DEBUGMSGT(("9:cert:add:name","%s\n", cert->common_name));
- }
+ netsnmp_ocert_parse(cert, ocert);
return ocert;
}
@@ -1052,7 +1080,6 @@ netsnmp_okey_get(netsnmp_key *key)
{
BIO *keybio;
EVP_PKEY *okey;
- char file[SNMP_MAXPATH];
if (NULL == key)
return NULL;
@@ -1060,19 +1087,8 @@ netsnmp_okey_get(netsnmp_key *key)
if (key->okey)
return key->okey;
- snprintf(file, sizeof(file),"%s/%s", key->info.dir, key->info.filename);
- DEBUGMSGT(("cert:key:read", "Checking file %s\n", key->info.filename));
-
- keybio = BIO_new(BIO_s_file());
- if (NULL == keybio) {
- snmp_log(LOG_ERR, "error creating BIO\n");
- return NULL;
- }
-
- if (BIO_read_filename(keybio, file) <=0) {
- snmp_log(LOG_ERR, "error reading certificate %s into BIO\n",
- key->info.filename);
- BIO_vfree(keybio);
+ keybio = netsnmp_open_bio(key->info.dir, key->info.filename);
+ if (!keybio) {
return NULL;
}
@@ -1158,7 +1174,7 @@ netsnmp_cert_load_x509(netsnmp_cert *cer
cert->issuer_cert = _find_issuer(cert);
if (NULL == cert->issuer_cert) {
DEBUGMSGT(("cert:load:warn",
- "couldn't load CA chain for cert %s\n",
+ "couldn't load full CA chain for cert %s\n",
cert->info.filename));
rc = CERT_LOAD_PARTIAL;
break;
@@ -1167,7 +1183,7 @@ netsnmp_cert_load_x509(netsnmp_cert *cer
/** get issuer ocert */
if ((NULL == cert->issuer_cert->ocert) &&
(netsnmp_ocert_get(cert->issuer_cert) == NULL)) {
- DEBUGMSGT(("cert:load:warn", "couldn't load cert chain for %s\n",
+ DEBUGMSGT(("cert:load:warn", "couldn't load full cert chain for %s\n",
cert->info.filename));
rc = CERT_LOAD_PARTIAL;
break;
@@ -1188,7 +1204,7 @@ _find_partner(netsnmp_cert *cert, netsnm
return;
}
- if(key) {
+ if (key) {
if (key->cert) {
DEBUGMSGT(("cert:partner", "key already has partner\n"));
return;
@@ -1201,7 +1217,8 @@ _find_partner(netsnmp_cert *cert, netsnm
return;
*pos = 0;
- matching = _cert_find_subset_fn( filename, key->info.dir );
+ matching = _cert_reduce_subset_first(_cert_find_subset_fn( filename,
+ key->info.dir ));
if (!matching)
return;
if (1 == matching->size) {
@@ -1221,7 +1238,7 @@ _find_partner(netsnmp_cert *cert, netsnm
DEBUGMSGT(("cert:partner", "%s matches multiple certs\n",
key->info.filename));
}
- else if(cert) {
+ else if (cert) {
if (cert->key) {
DEBUGMSGT(("cert:partner", "cert already has partner\n"));
return;
@@ -1259,76 +1276,189 @@ _find_partner(netsnmp_cert *cert, netsnm
}
}
+static netsnmp_key *
+_add_key(EVP_PKEY *okey, const char* dirname, const char* filename, FILE *index)
+{
+ netsnmp_key *key;
+
+ key = _new_key(dirname, filename);
+ if (NULL == key) {
+ return NULL;
+ }
+
+ key->okey = okey;
+
+ if (-1 == CONTAINER_INSERT(_keys, key)) {
+ DEBUGMSGT(("cert:key:file:add:err",
+ "error inserting key into container\n"));
+ netsnmp_key_free(key);
+ key = NULL;
+ }
+ if (index) {
+ fprintf(index, "k:%s\n", filename);
+ }
+
+ return key;
+}
+
+static netsnmp_cert *
+_add_cert(X509 *ocert, const char* dirname, const char* filename, int type, int offset,
+ int allowed_uses, FILE *index)
+{
+ netsnmp_cert *cert;
+
+ cert = _new_cert(dirname, filename, type, offset,
+ allowed_uses, -1, NULL, NULL, NULL);
+ if (NULL == cert)
+ return NULL;
+
+ netsnmp_ocert_parse(cert, ocert);
+
+ if (-1 == CONTAINER_INSERT(_certs, cert)) {
+ DEBUGMSGT(("cert:file:add:err",
+ "error inserting cert into container\n"));
+ netsnmp_cert_free(cert);
+ return NULL;
+ }
+
+ if (index) {
+ /** filename = NAME_MAX = 255 */
+ /** fingerprint max = 64*3=192 for sha512 */
+ /** common name / CN = 64 */
+ if (cert)
+ fprintf(index, "c:%s %d %d %d %d %s '%s' '%s'\n", filename,
+ cert->info.type, cert->offset, cert->info.allowed_uses,
+ cert->hash_type, cert->fingerprint,
+ cert->common_name, cert->subject);
+ }
+
+ return cert;
+}
+
static int
_add_certfile(const char* dirname, const char* filename, FILE *index)
{
- X509 *ocert;
- EVP_PKEY *okey;
+ BIO *certbio;
+ X509 *ocert = NULL;
+ X509 *ncert;
+ EVP_PKEY *okey = NULL;
netsnmp_cert *cert = NULL;
netsnmp_key *key = NULL;
char certfile[SNMP_MAXPATH];
int type;
+ int offset = 0;
if (((const void*)NULL == dirname) || (NULL == filename))
return -1;
type = _type_from_filename(filename);
- netsnmp_assert(type != NS_CERT_TYPE_UNKNOWN);
+ if (type == NS_CERT_TYPE_UNKNOWN) {
+ snmp_log(LOG_ERR, "certificate file '%s' type not recognised, ignoring\n", filename);
+ return -1;
+ }
- snprintf(certfile, sizeof(certfile),"%s/%s", dirname, filename);
+ certbio = netsnmp_open_bio(dirname, filename);
+ if (!certbio) {
+ return -1;
+ }
- DEBUGMSGT(("9:cert:file:add", "Checking file: %s (type %d)\n", filename,
- type));
+ switch (type) {
- if (NS_CERT_TYPE_KEY == type) {
- key = _new_key(dirname, filename);
- if (NULL == key)
- return -1;
- okey = netsnmp_okey_get(key);
- if (NULL == okey) {
- netsnmp_key_free(key);
- return -1;
- }
- key->okey = okey;
- if (-1 == CONTAINER_INSERT(_keys, key)) {
- DEBUGMSGT(("cert:key:file:add:err",
- "error inserting key into container\n"));
- netsnmp_key_free(key);
- key = NULL;
- }
- }
- else {
- cert = _new_cert(dirname, filename, type, -1, NULL, NULL, NULL);
- if (NULL == cert)
- return -1;
- ocert = netsnmp_ocert_get(cert);
- if (NULL == ocert) {
- netsnmp_cert_free(cert);
- return -1;
- }
- cert->ocert = ocert;
- if (-1 == CONTAINER_INSERT(_certs, cert)) {
- DEBUGMSGT(("cert:file:add:err",
- "error inserting cert into container\n"));
- netsnmp_cert_free(cert);
- cert = NULL;
- }
- }
- if ((NULL == cert) && (NULL == key)) {
- DEBUGMSGT(("cert:file:add:failure", "for %s\n", certfile));
- return -1;
+ case NS_CERT_TYPE_KEY:
+
+ okey = PEM_read_bio_PrivateKey(certbio, NULL, NULL, NULL);
+ if (NULL == okey)
+ snmp_log(LOG_ERR, "error parsing key file %s\n",
+ key->info.filename);
+ else {
+ key = _add_key(okey, dirname, filename, index);
+ if (NULL == key) {
+ EVP_PKEY_free(okey);
+ okey = NULL;
+ }
+ }
+ break;
+
+ case NS_CERT_TYPE_DER:
+
+ ocert = d2i_X509_bio(certbio, NULL); /* DER/ASN1 */
+ if (NULL != ocert) {
+ if (!_add_cert(ocert, dirname, filename, type, 0,
+ NS_CERT_REMOTE_PEER, index)) {
+ X509_free(ocert);
+ ocert = NULL;
+ }
+ break;
+ }
+ (void)BIO_reset(certbio);
+ /* Check for PEM if DER didn't work */
+ /* FALLTHROUGH */
+
+ case NS_CERT_TYPE_PEM:
+
+ if (NS_CERT_TYPE_DER == type) {
+ DEBUGMSGT(("9:cert:read", "Changing type from DER to PEM\n"));
+ type = NS_CERT_TYPE_PEM;
+ }
+
+ /* read the private key first so we can record this in the index */
+ okey = PEM_read_bio_PrivateKey(certbio, NULL, NULL, NULL);
+
+ (void)BIO_reset(certbio);
+
+ /* certs are read after the key */
+ ocert = ncert = PEM_read_bio_X509_AUX(certbio, NULL, NULL, NULL);
+ if (NULL != ocert) {
+ cert = _add_cert(ncert, dirname, filename, type, 0,
+ okey ? NS_CERT_IDENTITY | NS_CERT_REMOTE_PEER :
+ NS_CERT_REMOTE_PEER, index);
+ if (NULL == cert) {
+ X509_free(ocert);
+ ocert = ncert = NULL;
+ }
+ }
+ while (NULL != ncert) {
+ offset = BIO_tell(certbio);
+ ncert = PEM_read_bio_X509_AUX(certbio, NULL, NULL, NULL);
+ if (ncert) {
+ if (NULL == _add_cert(ncert, dirname, filename, type, offset, 0, index)) {
+ X509_free(ncert);
+ ncert = NULL;
+ }
+ }
+ }
+
+ if (NULL != okey) {
+ DEBUGMSGT(("cert:read:key", "found key with cert in %s\n",
+ cert->info.filename));
+ key = _add_key(okey, dirname, filename, NULL);
+ if (NULL != key) {
+ DEBUGMSGT(("cert:read:partner", "%s match found!\n",
+ cert->info.filename));
+ key->cert = cert;
+ cert->key = key;
+ }
+ else {
+ EVP_PKEY_free(okey);
+ okey = NULL;
+ }
+ }
+
+ break;
+
+#ifdef CERT_PKCS12_SUPPORT_MAYBE_LATER
+ case NS_CERT_TYPE_PKCS12:
+#endif
+
+ default:
+ break;
}
- if (index) {
- /** filename = NAME_MAX = 255 */
- /** fingerprint max = 64*3=192 for sha512 */
- /** common name / CN = 64 */
- if (cert)
- fprintf(index, "c:%s %d %d %s '%s' '%s'\n", filename,
- cert->info.type, cert->hash_type, cert->fingerprint,
- cert->common_name, cert->subject);
- else if (key)
- fprintf(index, "k:%s\n", filename);
+ BIO_vfree(certbio);
+
+ if ((NULL == ocert) && (NULL == okey)) {
+ snmp_log(LOG_ERR, "certificate file '%s' contained neither certificate nor key, ignoring\n", certfile);
+ return -1;
}
return 0;
@@ -1342,8 +1472,10 @@ _cert_read_index(const char *dirname, st
struct stat idx_stat;
char tmpstr[SNMP_MAXPATH + 5], filename[NAME_MAX];
char fingerprint[EVP_MAX_MD_SIZE*3], common_name[64+1], type_str[15];
- char subject[SNMP_MAXBUF_SMALL], hash_str[15];
- int count = 0, type, hash, version;
+ char subject[SNMP_MAXBUF_SMALL], hash_str[15], offset_str[15];
+ char allowed_uses_str[15];
+ ssize_t offset;
+ int count = 0, type, allowed_uses, hash, version;
netsnmp_cert *cert;
netsnmp_key *key;
netsnmp_container *newer, *found;
@@ -1386,7 +1518,8 @@ _cert_read_index(const char *dirname, st
(netsnmp_directory_filter*)
_time_filter,(void*)&idx_stat,
NETSNMP_DIR_NSFILE |
- NETSNMP_DIR_NSFILE_STATS);
+ NETSNMP_DIR_NSFILE_STATS |
+ NETSNMP_DIR_ALLOW_DUPLICATES);
if (newer) {
DEBUGMSGT(("cert:index:parse", "Index outdated; files modified\n"));
CONTAINER_FREE_ALL(newer, NULL);
@@ -1430,6 +1563,8 @@ _cert_read_index(const char *dirname, st
pos = &tmpstr[2];
if ((NULL == (pos=copy_nword(pos, filename, sizeof(filename)))) ||
(NULL == (pos=copy_nword(pos, type_str, sizeof(type_str)))) ||
+ (NULL == (pos=copy_nword(pos, offset_str, sizeof(offset_str)))) ||
+ (NULL == (pos=copy_nword(pos, allowed_uses_str, sizeof(allowed_uses_str)))) ||
(NULL == (pos=copy_nword(pos, hash_str, sizeof(hash_str)))) ||
(NULL == (pos=copy_nword(pos, fingerprint,
sizeof(fingerprint)))) ||
@@ -1442,9 +1577,11 @@ _cert_read_index(const char *dirname, st
break;
}
type = atoi(type_str);
+ offset = atoi(offset_str);
+ allowed_uses = atoi(allowed_uses_str);
hash = atoi(hash_str);
- cert = (void*)_new_cert(dirname, filename, type, hash, fingerprint,
- common_name, subject);
+ cert = _new_cert(dirname, filename, type, offset, allowed_uses, hash,
+ fingerprint, common_name, subject);
if (cert && 0 == CONTAINER_INSERT(found, cert))
++count;
else {
@@ -1549,7 +1686,8 @@ _add_certdir(const char *dirname)
(netsnmp_directory_filter*)
&_cert_cert_filter, NULL,
NETSNMP_DIR_RELATIVE_PATH |
- NETSNMP_DIR_EMPTY_OK );
+ NETSNMP_DIR_EMPTY_OK |
+ NETSNMP_DIR_ALLOW_DUPLICATES);
if (NULL == cert_container) {
DEBUGMSGT(("cert:index:dir",
"error creating container for cert files\n"));
@@ -1637,7 +1775,7 @@ _cert_print(netsnmp_cert *c, void *conte
if (NULL == c)
return;
- DEBUGMSGT(("cert:dump", "cert %s in %s\n", c->info.filename, c->info.dir));
+ DEBUGMSGT(("cert:dump", "cert %s in %s at offset %d\n", c->info.filename, c->info.dir, c->offset));
DEBUGMSGT(("cert:dump", " type %d flags 0x%x (%s)\n",
c->info.type, c->info.allowed_uses,
_mode_str(c->info.allowed_uses)));
@@ -1841,7 +1979,8 @@ netsnmp_cert_find(int what, int where, v
netsnmp_void_array *matching;
DEBUGMSGT(("cert:find:params", " hint = %s\n", (char *)hint));
- matching = _cert_find_subset_fn( filename, NULL );
+ matching = _cert_reduce_subset_what(_cert_find_subset_fn(
+ filename, NULL ), what);
if (!matching)
return NULL;
if (1 == matching->size)
@@ -1887,6 +2026,32 @@ netsnmp_cert_find(int what, int where, v
return result;
}
+netsnmp_void_array *
+netsnmp_certs_find(int what, int where, void *hint)
+{
+
+ DEBUGMSGT(("certs:find:params", "looking for %s(%d) in %s(0x%x), hint %p\n",
+ _mode_str(what), what, _where_str(where), where, hint));
+
+ if (NS_CERTKEY_FILE == where) {
+ /** hint == filename */
+ char *filename = (char*)hint;
+ netsnmp_void_array *matching;
+
+ DEBUGMSGT(("cert:find:params", " hint = %s\n", (char *)hint));
+ matching = _cert_reduce_subset_what(_cert_find_subset_fn(
+ filename, NULL ), what);
+
+ return matching;
+ } /* where = NS_CERTKEY_FILE */
+ else { /* unknown location */
+
+ DEBUGMSGT(("certs:find:err", "unhandled location %d for %d\n", where,
+ what));
+ return NULL;
+ }
+}
+
#ifndef NETSNMP_FEATURE_REMOVE_CERT_FINGERPRINTS
int
netsnmp_cert_check_vb_fingerprint(const netsnmp_variable_list *var)
@@ -2284,6 +2449,124 @@ _reduce_subset_dir(netsnmp_void_array *m
}
}
+/*
+ * reduce subset by eliminating any certificates that are not the
+ * first certficate in a file. This allows us to ignore certificate
+ * chains when testing for specific certificates, and to match keys
+ * to the first certificate only.
+ */
+static netsnmp_void_array *
+_cert_reduce_subset_first(netsnmp_void_array *matching)
+{
+ netsnmp_cert *cc;
+ int i = 0, j, newsize;
+
+ if ((NULL == matching))
+ return matching;
+
+ newsize = matching->size;
+
+ for( ; i < matching->size; ) {
+ /*
+ * if we've shifted matches down we'll hit a NULL entry before
+ * we hit the end of the array.
+ */
+ if (NULL == matching->array[i])
+ break;
+ /*
+ * skip over valid matches. The first entry has an offset of zero.
+ */
+ cc = (netsnmp_cert*)matching->array[i];
+ if (0 == cc->offset) {
+ ++i;
+ continue;
+ }
+ /*
+ * shrink array by shifting everything down a spot. Might not be
+ * the most efficient soloution, but this is just happening at
+ * startup and hopefully most certs won't have common prefixes.
+ */
+ --newsize;
+ for ( j=i; j < newsize; ++j )
+ matching->array[j] = matching->array[j+1];
+ matching->array[j] = NULL;
+ /** no ++i; just shifted down, need to look at same position again */
+ }
+ /*
+ * if we shifted, set the new size
+ */
+ if (newsize != matching->size) {
+ DEBUGMSGT(("9:cert:subset:first", "shrank from %" NETSNMP_PRIz "d to %d\n",
+ matching->size, newsize));
+ matching->size = newsize;
+ }
+
+ if (0 == matching->size) {
+ free(matching->array);
+ SNMP_FREE(matching);
+ }
+
+ return matching;
+}
+
+/*
+ * reduce subset by eliminating any certificates that do not match
+ * purpose specified.
+ */
+static netsnmp_void_array *
+_cert_reduce_subset_what(netsnmp_void_array *matching, int what)
+{
+ netsnmp_cert_common *cc;
+ int i = 0, j, newsize;
+
+ if ((NULL == matching))
+ return matching;
+
+ newsize = matching->size;
+
+ for( ; i < matching->size; ) {
+ /*
+ * if we've shifted matches down we'll hit a NULL entry before
+ * we hit the end of the array.
+ */
+ if (NULL == matching->array[i])
+ break;
+ /*
+ * skip over valid matches. The first entry has an offset of zero.
+ */
+ cc = (netsnmp_cert_common *)matching->array[i];
+ if ((cc->allowed_uses & what)) {
+ ++i;
+ continue;
+ }
+ /*
+ * shrink array by shifting everything down a spot. Might not be
+ * the most efficient soloution, but this is just happening at
+ * startup and hopefully most certs won't have common prefixes.
+ */
+ --newsize;
+ for ( j=i; j < newsize; ++j )
+ matching->array[j] = matching->array[j+1];
+ matching->array[j] = NULL;
+ /** no ++i; just shifted down, need to look at same position again */
+ }
+ /*
+ * if we shifted, set the new size
+ */
+ if (newsize != matching->size) {
+ DEBUGMSGT(("9:cert:subset:what", "shrank from %" NETSNMP_PRIz "d to %d\n",
+ matching->size, newsize));
+ matching->size = newsize;
+ }
+
+ if (0 == matching->size) {
+ free(matching->array);
+ SNMP_FREE(matching);
+ }
+
+ return matching;
+}
+
static netsnmp_void_array *
_cert_find_subset_common(const char *filename, netsnmp_container *container)
{
diff -urNp a/snmplib/transports/snmpTLSBaseDomain.c b/snmplib/transports/snmpTLSBaseDomain.c
--- a/snmplib/transports/snmpTLSBaseDomain.c 2021-06-09 10:55:22.791954900 +0200
+++ b/snmplib/transports/snmpTLSBaseDomain.c 2021-06-09 10:56:36.727272302 +0200
@@ -59,7 +59,7 @@ int openssl_local_index;
/* this is called during negotiation */
int verify_callback(int ok, X509_STORE_CTX *ctx) {
int err, depth;
- char buf[1024], *fingerprint;
+ char subject[SNMP_MAXBUF_MEDIUM], issuer[SNMP_MAXBUF_MEDIUM], *fingerprint;
X509 *thecert;
netsnmp_cert *cert;
_netsnmp_verify_info *verify_info;
@@ -71,10 +71,12 @@ int verify_callback(int ok, X509_STORE_C
/* things to do: */
- X509_NAME_oneline(X509_get_subject_name(thecert), buf, sizeof(buf));
+ X509_NAME_oneline(X509_get_subject_name(thecert), subject, sizeof(subject));
+ X509_NAME_oneline(X509_get_issuer_name(thecert), issuer, sizeof(issuer));
fingerprint = netsnmp_openssl_cert_get_fingerprint(thecert, -1);
- DEBUGMSGTL(("tls_x509:verify", "Cert: %s\n", buf));
- DEBUGMSGTL(("tls_x509:verify", " fp: %s\n", fingerprint ?
+ DEBUGMSGTL(("tls_x509:verify", " subject: %s\n", subject));
+ DEBUGMSGTL(("tls_x509:verify", " issuer: %s\n", issuer));
+ DEBUGMSGTL(("tls_x509:verify", " fp: %s\n", fingerprint ?
fingerprint : "unknown"));
ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
@@ -109,7 +111,7 @@ int verify_callback(int ok, X509_STORE_C
} else {
DEBUGMSGTL(("tls_x509:verify", " no matching fp found\n"));
/* log where we are and why called */
- snmp_log(LOG_ERR, "tls verification failure: ok=%d ctx=%p depth=%d err=%i:%s\n", ok, ctx, depth, err, X509_verify_cert_error_string(err));
+ snmp_log(LOG_ERR, "tls verification failure: ok=%d ctx=%p depth=%d fp=%s subject='%s' issuer='%s' err=%i:%s\n", ok, ctx, depth, fingerprint, subject, issuer, err, X509_verify_cert_error_string(err));
SNMP_FREE(fingerprint);
return 0;
}
@@ -425,23 +427,50 @@ netsnmp_tlsbase_extract_security_name(SS
int
_trust_this_cert(SSL_CTX *the_ctx, char *certspec) {
netsnmp_cert *trustcert;
+ netsnmp_cert *candidate;
+ netsnmp_void_array *matching = NULL;
+
+ int i;
DEBUGMSGTL(("sslctx_client", "Trying to load a trusted certificate: %s\n",
certspec));
/* load this identifier into the trust chain */
trustcert = netsnmp_cert_find(NS_CERT_CA,
- NS_CERTKEY_MULTIPLE,
+ NS_CERTKEY_FINGERPRINT,
certspec);
+
+ /* loop through all CA certs in the given files */
+ if (!trustcert) {
+ matching = netsnmp_certs_find(NS_CERT_CA,
+ NS_CERTKEY_FILE,
+ certspec);
+ for (i = 0; (matching) && (i < matching->size); ++i) {
+ candidate = (netsnmp_cert*)matching->array[i];
+ if (netsnmp_cert_trust(the_ctx, candidate) != SNMPERR_SUCCESS) {
+ free(matching->array);
+ free(matching);
+ LOGANDDIE("failed to load trust certificate");
+ }
+ } /** matching loop */
+
+ if (matching) {
+ free(matching->array);
+ free(matching);
+ return 1;
+ }
+ }
+
+ /* fall back to trusting the remote peer certificate */
if (!trustcert)
trustcert = netsnmp_cert_find(NS_CERT_REMOTE_PEER,
NS_CERTKEY_MULTIPLE,
certspec);
if (!trustcert)
LOGANDDIE("failed to find requested certificate to trust");
-
+
/* Add the certificate to the context */
- if (netsnmp_cert_trust_ca(the_ctx, trustcert) != SNMPERR_SUCCESS)
+ if (netsnmp_cert_trust(the_ctx, trustcert) != SNMPERR_SUCCESS)
LOGANDDIE("failed to load trust certificate");
return 1;
@@ -481,7 +510,7 @@ _sslctx_common_setup(SSL_CTX *the_ctx, _
NETSNMP_DS_LIB_X509_CRL_FILE);
if (NULL != crlFile) {
cert_store = SSL_CTX_get_cert_store(the_ctx);
- DEBUGMSGTL(("sslctx_client", "loading CRL: %s\n", crlFile));
+ DEBUGMSGTL(("sslctx_common", "loading CRL: %s\n", crlFile));
if (!cert_store)
LOGANDDIE("failed to find certificate store");
if (!(lookup = X509_STORE_add_lookup(cert_store, X509_LOOKUP_file())))
@@ -546,13 +575,19 @@ sslctx_client_setup(const SSL_METHOD *me
id_cert->key->info.filename));
if (SSL_CTX_use_certificate(the_ctx, id_cert->ocert) <= 0)
- LOGANDDIE("failed to set the certificate to use");
+ LOGANDDIE("failed to set the client certificate to use");
if (SSL_CTX_use_PrivateKey(the_ctx, id_cert->key->okey) <= 0)
- LOGANDDIE("failed to set the private key to use");
+ LOGANDDIE("failed to set the client private key to use");
if (!SSL_CTX_check_private_key(the_ctx))
- LOGANDDIE("public and private keys incompatible");
+ LOGANDDIE("client public and private keys incompatible");
+
+ while (id_cert->issuer_cert) {
+ id_cert = id_cert->issuer_cert;
+ if (!SSL_CTX_add_extra_chain_cert(the_ctx, id_cert->ocert))
+ LOGANDDIE("failed to add intermediate client certificate");
+ }
if (tlsbase->their_identity)
peer_cert = netsnmp_cert_find(NS_CERT_REMOTE_PEER,
@@ -566,11 +601,11 @@ sslctx_client_setup(const SSL_METHOD *me
peer_cert ? peer_cert->info.filename : "none"));
/* Trust the expected certificate */
- if (netsnmp_cert_trust_ca(the_ctx, peer_cert) != SNMPERR_SUCCESS)
+ if (netsnmp_cert_trust(the_ctx, peer_cert) != SNMPERR_SUCCESS)
LOGANDDIE ("failed to set verify paths");
}
- /* trust a certificate (possibly a CA) aspecifically passed in */
+ /* trust a certificate (possibly a CA) specifically passed in */
if (tlsbase->trust_cert) {
if (!_trust_this_cert(the_ctx, tlsbase->trust_cert))
return 0;
@@ -589,7 +624,7 @@ sslctx_server_setup(const SSL_METHOD *me
/* setting up for ssl */
SSL_CTX *the_ctx = SSL_CTX_new(NETSNMP_REMOVE_CONST(SSL_METHOD *, method));
if (!the_ctx) {
- LOGANDDIE("can't create a new context");
+ LOGANDDIE("can't create a new server context");
}
id_cert = netsnmp_cert_find(NS_CERT_IDENTITY, NS_CERTKEY_DEFAULT, NULL);
@@ -597,7 +632,7 @@ sslctx_server_setup(const SSL_METHOD *me
LOGANDDIE ("error finding server identity keys");
if (!id_cert->key || !id_cert->key->okey)
- LOGANDDIE("failed to load private key");
+ LOGANDDIE("failed to load server private key");
DEBUGMSGTL(("sslctx_server", "using public key: %s\n",
id_cert->info.filename));
@@ -605,13 +640,19 @@ sslctx_server_setup(const SSL_METHOD *me
id_cert->key->info.filename));
if (SSL_CTX_use_certificate(the_ctx, id_cert->ocert) <= 0)
- LOGANDDIE("failed to set the certificate to use");
+ LOGANDDIE("failed to set the server certificate to use");
if (SSL_CTX_use_PrivateKey(the_ctx, id_cert->key->okey) <= 0)
- LOGANDDIE("failed to set the private key to use");
+ LOGANDDIE("failed to set the server private key to use");
if (!SSL_CTX_check_private_key(the_ctx))
- LOGANDDIE("public and private keys incompatible");
+ LOGANDDIE("server public and private keys incompatible");
+
+ while (id_cert->issuer_cert) {
+ id_cert = id_cert->issuer_cert;
+ if (!SSL_CTX_add_extra_chain_cert(the_ctx, id_cert->ocert))
+ LOGANDDIE("failed to add intermediate server certificate");
+ }
SSL_CTX_set_read_ahead(the_ctx, 1); /* XXX: DTLS only? */
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