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The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: This allows OpenVPN to load non-default providers. This is mainly useful for loading the legacy provider with --providers legacy default Patch v4: use spaces to seperate providers, unload providers. Patch v5: General cleanup, rename option to --providers, add option to usage() and add an entry to Changes.rst Patch v6: allow --providers [...] Content analysis details: (0.3 points, 6.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 SPF_NONE SPF: sender does not publish an SPF Record 0.2 HEADER_FROM_DIFFERENT_DOMAINS From and EnvelopeFrom 2nd level mail domains are different X-Headers-End: 1mlWCU-00AnGH-Jn Subject: [Openvpn-devel] [PATCH v6] [OSSL 3.0] Allow loading of non default providers X-BeenThere: openvpn-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: openvpn-devel-bounces@lists.sourceforge.net X-getmail-retrieved-from-mailbox: Inbox This allows OpenVPN to load non-default providers. This is mainly useful for loading the legacy provider with --providers legacy default Patch v4: use spaces to seperate providers, unload providers. Patch v5: General cleanup, rename option to --providers, add option to usage() and add an entry to Changes.rst Patch v6: allow --providers also to be used (and be ignored) with mbed TLS Signed-off-by: Arne Schwabe Acked-by: Gert Doering --- Changes.rst | 7 +++++++ doc/man-sections/generic-options.rst | 12 +++++++++++ src/openvpn/crypto_backend.h | 15 ++++++++++++++ src/openvpn/crypto_mbedtls.c | 13 ++++++++++++ src/openvpn/crypto_mbedtls.h | 3 +++ src/openvpn/crypto_openssl.c | 30 ++++++++++++++++++++++++++++ src/openvpn/crypto_openssl.h | 9 +++++++++ src/openvpn/openvpn.c | 13 ++++++++++++ src/openvpn/options.c | 8 ++++++++ src/openvpn/options.h | 9 +++++++++ 10 files changed, 119 insertions(+) diff --git a/Changes.rst b/Changes.rst index 6f04e59ac..7cceffcdb 100644 --- a/Changes.rst +++ b/Changes.rst @@ -50,6 +50,13 @@ Compatibility mode (``--compat-mode``) with older peers. The options ``--compat-mode`` allows UIs to provide users with an easy way to still connect to older servers. +OpenSSL 3.0 support + OpenSSL 3.0 has been added. Most of OpenSSL 3.0 changes are not user visible but + improve general compatibility with OpenSSL 3.0. ``--tls-cert-profile insecure`` + has been added to allow selecting the lowest OpenSSL security level (not + recommended, use only if you must). OpenSSL 3.0 no longer supports the Blowfish + (and other deprecated) algorithm by default and the new option ``--providers`` + allows loading the legacy provider to renable these algorithms. Deprecated features ------------------- diff --git a/doc/man-sections/generic-options.rst b/doc/man-sections/generic-options.rst index e6c1fe455..a8f049f20 100644 --- a/doc/man-sections/generic-options.rst +++ b/doc/man-sections/generic-options.rst @@ -280,6 +280,18 @@ which mode OpenVPN is configured as. This option solves the problem by persisting keys across :code:`SIGUSR1` resets, so they don't need to be re-read. +--providers providers + Load the list of (OpenSSL) providers. This is mainly useful for using an + external provider for key management like tpm2-openssl or to load the + legacy provider with + + :: + + --providers legacy default + + Behaviour of changing this option between SIGHUP might not be well behaving. + If you need to change/add/remove this option, fully restart OpenVPN. + --remap-usr1 signal Control whether internally or externally generated :code:`SIGUSR1` signals are remapped to :code:`SIGHUP` (restart without persisting state) or diff --git a/src/openvpn/crypto_backend.h b/src/openvpn/crypto_backend.h index 5aab3e1b7..c16837619 100644 --- a/src/openvpn/crypto_backend.h +++ b/src/openvpn/crypto_backend.h @@ -78,6 +78,21 @@ void crypto_clear_error(void); */ void crypto_init_lib_engine(const char *engine_name); + +/** + * Load the given (OpenSSL) providers + * @param provider name of providers to load + * @return reference to the loaded provider + */ +provider_t *crypto_load_provider(const char *provider); + +/** + * Unloads the given (OpenSSL) provider + * @param provname name of the provider to unload + * @param provider pointer to the provider to unload + */ +void crypto_unload_provider(const char* provname, provider_t *provider); + #ifdef DMALLOC /* * OpenSSL memory debugging. If dmalloc debugging is enabled, tell diff --git a/src/openvpn/crypto_mbedtls.c b/src/openvpn/crypto_mbedtls.c index 08b9e004f..39dbf38a5 100644 --- a/src/openvpn/crypto_mbedtls.c +++ b/src/openvpn/crypto_mbedtls.c @@ -69,6 +69,19 @@ crypto_init_lib_engine(const char *engine_name) "available"); } +provider_t *crypto_load_provider(const char *provider) +{ + if (provider) + { + msg(M_WARN, "Note: mbed TLS provider functionality is not available"); + } + return NULL; +} + +void crypto_unload_provider(const char* provname, provider_t *provider) +{ +} + /* * * Functions related to the core crypto library diff --git a/src/openvpn/crypto_mbedtls.h b/src/openvpn/crypto_mbedtls.h index 019de01d1..758ab1b40 100644 --- a/src/openvpn/crypto_mbedtls.h +++ b/src/openvpn/crypto_mbedtls.h @@ -48,6 +48,9 @@ typedef mbedtls_md_context_t md_ctx_t; /** Generic HMAC %context. */ typedef mbedtls_md_context_t hmac_ctx_t; +/* Use a dummy type for the provider */ +typedef void provider_t; + /** Maximum length of an IV */ #define OPENVPN_MAX_IV_LENGTH MBEDTLS_MAX_IV_LENGTH diff --git a/src/openvpn/crypto_openssl.c b/src/openvpn/crypto_openssl.c index cc1d62210..c9731adb3 100644 --- a/src/openvpn/crypto_openssl.c +++ b/src/openvpn/crypto_openssl.c @@ -54,6 +54,9 @@ #if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER) #include #endif +#if OPENSSL_VERSION_NUMBER >= 0x30000000L +#include +#endif #if defined(_WIN32) && defined(OPENSSL_NO_EC) #error Windows build with OPENSSL_NO_EC: disabling EC key is not supported. @@ -149,6 +152,33 @@ crypto_init_lib_engine(const char *engine_name) #endif } +provider_t * +crypto_load_provider(const char *provider) +{ +#if OPENSSL_VERSION_NUMBER >= 0x30000000L + /* Load providers into the default (NULL) library context */ + OSSL_PROVIDER* prov = OSSL_PROVIDER_load(NULL, provider); + if (!prov) + { + crypto_msg(M_FATAL, "failed to load provider '%s'", provider); + } + return prov; +#else /* OPENSSL_VERSION_NUMBER >= 0x30000000L */ + msg(M_WARN, "Note: OpenSSL provider functionality is not available"); + return NULL; +#endif +} + +void crypto_unload_provider(const char* provname, provider_t *provider) +{ +#if OPENSSL_VERSION_NUMBER >= 0x30000000L + if (!OSSL_PROVIDER_unload(provider)) + { + crypto_msg(M_FATAL, "failed to unload provider '%s'", provname); + } +#endif +} + /* * * Functions related to the core crypto library diff --git a/src/openvpn/crypto_openssl.h b/src/openvpn/crypto_openssl.h index e540a76b9..446f08508 100644 --- a/src/openvpn/crypto_openssl.h +++ b/src/openvpn/crypto_openssl.h @@ -33,6 +33,10 @@ #include #include #include +#if OPENSSL_VERSION_NUMBER >= 0x30000000L +#include +#endif + /** Generic cipher key type %context. */ typedef EVP_CIPHER cipher_kt_t; @@ -49,12 +53,17 @@ typedef EVP_MD_CTX md_ctx_t; /** Generic HMAC %context. */ #if OPENSSL_VERSION_NUMBER < 0x30000000L typedef HMAC_CTX hmac_ctx_t; + +/* Use a dummy type for the provider */ +typedef void provider_t; #else typedef struct { OSSL_PARAM params[3]; uint8_t key[EVP_MAX_KEY_LENGTH]; EVP_MAC_CTX *ctx; } hmac_ctx_t; + +typedef OSSL_PROVIDER provider_t; #endif /** Maximum length of an IV */ diff --git a/src/openvpn/openvpn.c b/src/openvpn/openvpn.c index da06f59c2..a18a4dd43 100644 --- a/src/openvpn/openvpn.c +++ b/src/openvpn/openvpn.c @@ -112,10 +112,23 @@ void init_early(struct context *c) /* init verbosity and mute levels */ init_verb_mute(c, IVM_LEVEL_1); + /* Initialise OpenSSL provider, this needs to be initialised this + * early since option post-processing and also openssl info + * printing depends on it */ + for (int j=1; j < MAX_PARMS && c->options.providers.names[j]; j++) + { + c->options.providers.providers[j] = + crypto_load_provider(c->options.providers.names[j]); + } } static void uninit_early(struct context *c) { + for (int j=1; j < MAX_PARMS && c->options.providers.providers[j]; j++) + { + crypto_unload_provider(c->options.providers.names[j], + c->options.providers.providers[j]); + } net_ctx_free(&c->net_ctx); } diff --git a/src/openvpn/options.c b/src/openvpn/options.c index b5d65d293..310e169aa 100644 --- a/src/openvpn/options.c +++ b/src/openvpn/options.c @@ -581,6 +581,7 @@ static const char usage_message[] = " : Use --show-tls to see a list of supported TLS ciphers (suites).\n" "--tls-cert-profile p : Set the allowed certificate crypto algorithm profile\n" " (default=legacy).\n" + "--providers l : A list l of OpenSSL providers to load.\n" "--tls-timeout n : Packet retransmit timeout on TLS control channel\n" " if no ACK from remote within n seconds (default=%d).\n" "--reneg-bytes n : Renegotiate data chan. key after n bytes sent and recvd.\n" @@ -8158,6 +8159,13 @@ add_option(struct options *options, } } #endif /* ENABLE_CRYPTO_MBEDTLS */ + else if (streq(p[0], "providers") && p[1]) + { + for (size_t j = 1; j < MAX_PARMS && p[j] != NULL;j++) + { + options->providers.names[j] = p[j]; + } + } #ifdef ENABLE_PREDICTION_RESISTANCE else if (streq(p[0], "use-prediction-resistance") && !p[1]) { diff --git a/src/openvpn/options.h b/src/openvpn/options.h index 20b34ed4e..d4f41cd71 100644 --- a/src/openvpn/options.h +++ b/src/openvpn/options.h @@ -179,6 +179,14 @@ struct remote_list struct remote_entry *array[CONNECTION_LIST_SIZE]; }; +struct provider_list +{ + /* Names of the providers */ + const char *names[MAX_PARMS]; + /* Pointers to the loaded providers to unload them */ + provider_t *providers[MAX_PARMS]; +}; + enum vlan_acceptable_frames { VLAN_ONLY_TAGGED, @@ -519,6 +527,7 @@ struct options const char *ncp_ciphers; const char *authname; const char *engine; + struct provider_list providers; bool replay; bool mute_replay_warnings; int replay_window;