538 lines
19 KiB
C
538 lines
19 KiB
C
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/*
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* SSL/TLS interface definition
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* Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#ifndef TLS_H
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#define TLS_H
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struct tls_connection;
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struct tls_keys {
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const u8 *master_key; /* TLS master secret */
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size_t master_key_len;
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const u8 *client_random;
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size_t client_random_len;
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const u8 *server_random;
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size_t server_random_len;
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};
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enum tls_event {
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TLS_CERT_CHAIN_SUCCESS,
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TLS_CERT_CHAIN_FAILURE,
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TLS_PEER_CERTIFICATE,
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TLS_ALERT
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};
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/*
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* Note: These are used as identifier with external programs and as such, the
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* values must not be changed.
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*/
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enum tls_fail_reason {
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TLS_FAIL_UNSPECIFIED = 0,
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TLS_FAIL_UNTRUSTED = 1,
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TLS_FAIL_REVOKED = 2,
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TLS_FAIL_NOT_YET_VALID = 3,
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TLS_FAIL_EXPIRED = 4,
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TLS_FAIL_SUBJECT_MISMATCH = 5,
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TLS_FAIL_ALTSUBJECT_MISMATCH = 6,
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TLS_FAIL_BAD_CERTIFICATE = 7,
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TLS_FAIL_SERVER_CHAIN_PROBE = 8
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};
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union tls_event_data {
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struct {
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int depth;
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const char *subject;
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enum tls_fail_reason reason;
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const char *reason_txt;
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const struct wpabuf *cert;
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} cert_fail;
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struct {
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int depth;
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const char *subject;
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const struct wpabuf *cert;
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const u8 *hash;
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size_t hash_len;
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} peer_cert;
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struct {
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int is_local;
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const char *type;
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const char *description;
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} alert;
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};
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struct tls_config {
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const char *opensc_engine_path;
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const char *pkcs11_engine_path;
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const char *pkcs11_module_path;
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int fips_mode;
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int cert_in_cb;
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void (*event_cb)(void *ctx, enum tls_event ev,
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union tls_event_data *data);
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void *cb_ctx;
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};
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#define TLS_CONN_ALLOW_SIGN_RSA_MD5 BIT(0)
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#define TLS_CONN_DISABLE_TIME_CHECKS BIT(1)
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#define TLS_CONN_DISABLE_SESSION_TICKET BIT(2)
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#define TLS_CONN_REQUEST_OCSP BIT(3)
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#define TLS_CONN_REQUIRE_OCSP BIT(4)
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/**
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* struct tls_connection_params - Parameters for TLS connection
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* @ca_cert: File or reference name for CA X.509 certificate in PEM or DER
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* format
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* @ca_cert_blob: ca_cert as inlined data or %NULL if not used
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* @ca_cert_blob_len: ca_cert_blob length
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* @ca_path: Path to CA certificates (OpenSSL specific)
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* @subject_match: String to match in the subject of the peer certificate or
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* %NULL to allow all subjects
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* @altsubject_match: String to match in the alternative subject of the peer
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* certificate or %NULL to allow all alternative subjects
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* @client_cert: File or reference name for client X.509 certificate in PEM or
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* DER format
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* @client_cert_blob: client_cert as inlined data or %NULL if not used
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* @client_cert_blob_len: client_cert_blob length
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* @private_key: File or reference name for client private key in PEM or DER
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* format (traditional format (RSA PRIVATE KEY) or PKCS#8 (PRIVATE KEY)
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* @private_key_blob: private_key as inlined data or %NULL if not used
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* @private_key_blob_len: private_key_blob length
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* @private_key_passwd: Passphrase for decrypted private key, %NULL if no
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* passphrase is used.
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* @dh_file: File name for DH/DSA data in PEM format, or %NULL if not used
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* @dh_blob: dh_file as inlined data or %NULL if not used
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* @dh_blob_len: dh_blob length
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* @engine: 1 = use engine (e.g., a smartcard) for private key operations
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* (this is OpenSSL specific for now)
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* @engine_id: engine id string (this is OpenSSL specific for now)
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* @ppin: pointer to the pin variable in the configuration
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* (this is OpenSSL specific for now)
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* @key_id: the private key's id when using engine (this is OpenSSL
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* specific for now)
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* @cert_id: the certificate's id when using engine
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* @ca_cert_id: the CA certificate's id when using engine
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* @flags: Parameter options (TLS_CONN_*)
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* @ocsp_stapling_response: DER encoded file with cached OCSP stapling response
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* or %NULL if OCSP is not enabled
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*
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* TLS connection parameters to be configured with tls_connection_set_params()
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* and tls_global_set_params().
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*
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* Certificates and private key can be configured either as a reference name
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* (file path or reference to certificate store) or by providing the same data
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* as a pointer to the data in memory. Only one option will be used for each
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* field.
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*/
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struct tls_connection_params {
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const char *ca_cert;
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const u8 *ca_cert_blob;
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size_t ca_cert_blob_len;
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const char *ca_path;
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const char *subject_match;
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const char *altsubject_match;
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const char *client_cert;
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const u8 *client_cert_blob;
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size_t client_cert_blob_len;
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const char *private_key;
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const u8 *private_key_blob;
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size_t private_key_blob_len;
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const char *private_key_passwd;
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const char *dh_file;
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const u8 *dh_blob;
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size_t dh_blob_len;
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/* OpenSSL specific variables */
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int engine;
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const char *engine_id;
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const char *pin;
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const char *key_id;
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const char *cert_id;
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const char *ca_cert_id;
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unsigned int flags;
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const char *ocsp_stapling_response;
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};
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/**
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* tls_init - Initialize TLS library
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* @conf: Configuration data for TLS library
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* Returns: Context data to be used as tls_ctx in calls to other functions,
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* or %NULL on failure.
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*
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* Called once during program startup and once for each RSN pre-authentication
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* session. In other words, there can be two concurrent TLS contexts. If global
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* library initialization is needed (i.e., one that is shared between both
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* authentication types), the TLS library wrapper should maintain a reference
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* counter and do global initialization only when moving from 0 to 1 reference.
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*/
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void * tls_init(void);
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/**
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* tls_deinit - Deinitialize TLS library
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* @tls_ctx: TLS context data from tls_init()
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*
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* Called once during program shutdown and once for each RSN pre-authentication
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* session. If global library deinitialization is needed (i.e., one that is
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* shared between both authentication types), the TLS library wrapper should
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* maintain a reference counter and do global deinitialization only when moving
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* from 1 to 0 references.
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*/
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void tls_deinit(void *tls_ctx);
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/**
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* tls_get_errors - Process pending errors
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* @tls_ctx: TLS context data from tls_init()
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* Returns: Number of found error, 0 if no errors detected.
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*
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* Process all pending TLS errors.
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*/
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int tls_get_errors(void *tls_ctx);
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/**
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* tls_connection_init - Initialize a new TLS connection
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* @tls_ctx: TLS context data from tls_init()
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* Returns: Connection context data, conn for other function calls
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*/
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struct tls_connection * tls_connection_init(void *tls_ctx);
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/**
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* tls_connection_deinit - Free TLS connection data
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Release all resources allocated for TLS connection.
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*/
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void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn);
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/**
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* tls_connection_established - Has the TLS connection been completed?
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* Returns: 1 if TLS connection has been completed, 0 if not.
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*/
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int tls_connection_established(void *tls_ctx, struct tls_connection *conn);
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/**
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* tls_connection_shutdown - Shutdown TLS connection
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* Returns: 0 on success, -1 on failure
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*
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* Shutdown current TLS connection without releasing all resources. New
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* connection can be started by using the same conn without having to call
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* tls_connection_init() or setting certificates etc. again. The new
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* connection should try to use session resumption.
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*/
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int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn);
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enum {
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TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3,
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TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2
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};
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/**
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* tls_connection_set_params - Set TLS connection parameters
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @params: Connection parameters
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* Returns: 0 on success, -1 on failure,
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* TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
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* PKCS#11 engine failure, or
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* TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
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* PKCS#11 engine private key.
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*/
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int __must_check
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tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
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const struct tls_connection_params *params);
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/**
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* tls_global_set_params - Set TLS parameters for all TLS connection
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* @tls_ctx: TLS context data from tls_init()
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* @params: Global TLS parameters
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* Returns: 0 on success, -1 on failure,
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* TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
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* PKCS#11 engine failure, or
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* TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
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* PKCS#11 engine private key.
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*/
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int __must_check tls_global_set_params(
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void *tls_ctx, const struct tls_connection_params *params);
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/**
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* tls_global_set_verify - Set global certificate verification options
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* @tls_ctx: TLS context data from tls_init()
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* @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate,
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* 2 = verify CRL for all certificates
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* Returns: 0 on success, -1 on failure
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*/
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int __must_check tls_global_set_verify(void *tls_ctx, int check_crl);
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/**
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* tls_connection_set_verify - Set certificate verification options
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @verify_peer: 1 = verify peer certificate
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* Returns: 0 on success, -1 on failure
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*/
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int __must_check tls_connection_set_verify(void *tls_ctx,
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struct tls_connection *conn,
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int verify_peer);
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/**
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* tls_connection_get_keys - Get master key and random data from TLS connection
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @keys: Structure of key/random data (filled on success)
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* Returns: 0 on success, -1 on failure
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*/
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int __must_check tls_connection_get_keys(void *tls_ctx,
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struct tls_connection *conn,
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struct tls_keys *keys);
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/**
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* tls_connection_prf - Use TLS-PRF to derive keying material
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @label: Label (e.g., description of the key) for PRF
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* @server_random_first: seed is 0 = client_random|server_random,
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* 1 = server_random|client_random
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* @out: Buffer for output data from TLS-PRF
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* @out_len: Length of the output buffer
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* Returns: 0 on success, -1 on failure
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*
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* This function is optional to implement if tls_connection_get_keys() provides
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* access to master secret and server/client random values. If these values are
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* not exported from the TLS library, tls_connection_prf() is required so that
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* further keying material can be derived from the master secret. If not
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* implemented, the function will still need to be defined, but it can just
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* return -1. Example implementation of this function is in tls_prf_sha1_md5()
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* when it is called with seed set to client_random|server_random (or
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* server_random|client_random).
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*/
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int __must_check tls_connection_prf(void *tls_ctx,
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struct tls_connection *conn,
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const char *label,
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int server_random_first,
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u8 *out, size_t out_len);
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/**
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* tls_connection_handshake - Process TLS handshake (client side)
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @in_data: Input data from TLS server
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* @appl_data: Pointer to application data pointer, or %NULL if dropped
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* Returns: Output data, %NULL on failure
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*
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* The caller is responsible for freeing the returned output data. If the final
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* handshake message includes application data, this is decrypted and
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* appl_data (if not %NULL) is set to point this data. The caller is
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* responsible for freeing appl_data.
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*
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* This function is used during TLS handshake. The first call is done with
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* in_data == %NULL and the library is expected to return ClientHello packet.
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* This packet is then send to the server and a response from server is given
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* to TLS library by calling this function again with in_data pointing to the
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* TLS message from the server.
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*
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* If the TLS handshake fails, this function may return %NULL. However, if the
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* TLS library has a TLS alert to send out, that should be returned as the
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* output data. In this case, tls_connection_get_failed() must return failure
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||
|
|
* (> 0).
|
||
|
|
*
|
||
|
|
* tls_connection_established() should return 1 once the TLS handshake has been
|
||
|
|
* completed successfully.
|
||
|
|
*/
|
||
|
|
struct wpabuf * tls_connection_handshake(void *tls_ctx,
|
||
|
|
struct tls_connection *conn,
|
||
|
|
const struct wpabuf *in_data,
|
||
|
|
struct wpabuf **appl_data);
|
||
|
|
|
||
|
|
struct wpabuf * tls_connection_handshake2(void *tls_ctx,
|
||
|
|
struct tls_connection *conn,
|
||
|
|
const struct wpabuf *in_data,
|
||
|
|
struct wpabuf **appl_data,
|
||
|
|
int *more_data_needed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_server_handshake - Process TLS handshake (server side)
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* @in_data: Input data from TLS peer
|
||
|
|
* @appl_data: Pointer to application data pointer, or %NULL if dropped
|
||
|
|
* Returns: Output data, %NULL on failure
|
||
|
|
*
|
||
|
|
* The caller is responsible for freeing the returned output data.
|
||
|
|
*/
|
||
|
|
struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
|
||
|
|
struct tls_connection *conn,
|
||
|
|
const struct wpabuf *in_data,
|
||
|
|
struct wpabuf **appl_data);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_encrypt - Encrypt data into TLS tunnel
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* @in_data: Plaintext data to be encrypted
|
||
|
|
* Returns: Encrypted TLS data or %NULL on failure
|
||
|
|
*
|
||
|
|
* This function is used after TLS handshake has been completed successfully to
|
||
|
|
* send data in the encrypted tunnel. The caller is responsible for freeing the
|
||
|
|
* returned output data.
|
||
|
|
*/
|
||
|
|
struct wpabuf * tls_connection_encrypt(void *tls_ctx,
|
||
|
|
struct tls_connection *conn,
|
||
|
|
const struct wpabuf *in_data);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_decrypt - Decrypt data from TLS tunnel
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* @in_data: Encrypted TLS data
|
||
|
|
* Returns: Decrypted TLS data or %NULL on failure
|
||
|
|
*
|
||
|
|
* This function is used after TLS handshake has been completed successfully to
|
||
|
|
* receive data from the encrypted tunnel. The caller is responsible for
|
||
|
|
* freeing the returned output data.
|
||
|
|
*/
|
||
|
|
struct wpabuf * tls_connection_decrypt(void *tls_ctx,
|
||
|
|
struct tls_connection *conn,
|
||
|
|
const struct wpabuf *in_data);
|
||
|
|
|
||
|
|
struct wpabuf * tls_connection_decrypt2(void *tls_ctx,
|
||
|
|
struct tls_connection *conn,
|
||
|
|
const struct wpabuf *in_data,
|
||
|
|
int *more_data_needed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_resumed - Was session resumption used
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* Returns: 1 if current session used session resumption, 0 if not
|
||
|
|
*/
|
||
|
|
int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn);
|
||
|
|
|
||
|
|
enum {
|
||
|
|
TLS_CIPHER_NONE,
|
||
|
|
TLS_CIPHER_RC4_SHA /* 0x0005 */,
|
||
|
|
TLS_CIPHER_AES128_SHA /* 0x002f */,
|
||
|
|
TLS_CIPHER_RSA_DHE_AES128_SHA /* 0x0031 */,
|
||
|
|
TLS_CIPHER_ANON_DH_AES128_SHA /* 0x0034 */
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_set_cipher_list - Configure acceptable cipher suites
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
|
||
|
|
* (TLS_CIPHER_*).
|
||
|
|
* Returns: 0 on success, -1 on failure
|
||
|
|
*/
|
||
|
|
int __must_check tls_connection_set_cipher_list(void *tls_ctx,
|
||
|
|
struct tls_connection *conn,
|
||
|
|
u8 *ciphers);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_get_cipher - Get current cipher name
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* @buf: Buffer for the cipher name
|
||
|
|
* @buflen: buf size
|
||
|
|
* Returns: 0 on success, -1 on failure
|
||
|
|
*
|
||
|
|
* Get the name of the currently used cipher.
|
||
|
|
*/
|
||
|
|
int __must_check tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
|
||
|
|
char *buf, size_t buflen);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_enable_workaround - Enable TLS workaround options
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* Returns: 0 on success, -1 on failure
|
||
|
|
*
|
||
|
|
* This function is used to enable connection-specific workaround options for
|
||
|
|
* buffer SSL/TLS implementations.
|
||
|
|
*/
|
||
|
|
int __must_check tls_connection_enable_workaround(void *tls_ctx,
|
||
|
|
struct tls_connection *conn);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_client_hello_ext - Set TLS extension for ClientHello
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* @ext_type: Extension type
|
||
|
|
* @data: Extension payload (%NULL to remove extension)
|
||
|
|
* @data_len: Extension payload length
|
||
|
|
* Returns: 0 on success, -1 on failure
|
||
|
|
*/
|
||
|
|
int __must_check tls_connection_client_hello_ext(void *tls_ctx,
|
||
|
|
struct tls_connection *conn,
|
||
|
|
int ext_type, const u8 *data,
|
||
|
|
size_t data_len);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_get_failed - Get connection failure status
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
*
|
||
|
|
* Returns >0 if connection has failed, 0 if not.
|
||
|
|
*/
|
||
|
|
int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_get_read_alerts - Get connection read alert status
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* Returns: Number of times a fatal read (remote end reported error) has
|
||
|
|
* happened during this connection.
|
||
|
|
*/
|
||
|
|
int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_get_write_alerts - Get connection write alert status
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* Returns: Number of times a fatal write (locally detected error) has happened
|
||
|
|
* during this connection.
|
||
|
|
*/
|
||
|
|
int tls_connection_get_write_alerts(void *tls_ctx,
|
||
|
|
struct tls_connection *conn);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_connection_get_keyblock_size - Get TLS key_block size
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* @conn: Connection context data from tls_connection_init()
|
||
|
|
* Returns: Size of the key_block for the negotiated cipher suite or -1 on
|
||
|
|
* failure
|
||
|
|
*/
|
||
|
|
int tls_connection_get_keyblock_size(void *tls_ctx,
|
||
|
|
struct tls_connection *conn);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tls_capabilities - Get supported TLS capabilities
|
||
|
|
* @tls_ctx: TLS context data from tls_init()
|
||
|
|
* Returns: Bit field of supported TLS capabilities (TLS_CAPABILITY_*)
|
||
|
|
*/
|
||
|
|
unsigned int tls_capabilities(void *tls_ctx);
|
||
|
|
|
||
|
|
typedef int (*tls_session_ticket_cb)
|
||
|
|
(void *ctx, const u8 *ticket, size_t len, const u8 *client_random,
|
||
|
|
const u8 *server_random, u8 *master_secret);
|
||
|
|
|
||
|
|
int __must_check tls_connection_set_session_ticket_cb(
|
||
|
|
void *tls_ctx, struct tls_connection *conn,
|
||
|
|
tls_session_ticket_cb cb, void *ctx);
|
||
|
|
|
||
|
|
int tls_prf_sha1_md5(const u8 *secret, size_t secret_len, const char *label,
|
||
|
|
const u8 *seed, size_t seed_len, u8 *out, size_t outlen);
|
||
|
|
|
||
|
|
#endif /* TLS_H */
|