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| -rw-r--r-- | src/shrpx_tls.h | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/src/shrpx_tls.h b/src/shrpx_tls.h new file mode 100644 index 0000000..5d751c0 --- /dev/null +++ b/src/shrpx_tls.h @@ -0,0 +1,327 @@ +/* + * nghttp2 - HTTP/2 C Library + * + * Copyright (c) 2012 Tatsuhiro Tsujikawa + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ +#ifndef SHRPX_TLS_H +#define SHRPX_TLS_H + +#include "shrpx.h" + +#include <vector> +#include <mutex> + +#include <openssl/ssl.h> +#include <openssl/err.h> + +#include <ev.h> + +#ifdef HAVE_NEVERBLEED +# include <neverbleed.h> +#endif // HAVE_NEVERBLEED + +#include "network.h" +#include "shrpx_config.h" +#include "shrpx_router.h" + +namespace shrpx { + +class ClientHandler; +class Worker; +class DownstreamConnectionPool; +struct DownstreamAddr; +struct UpstreamAddr; + +namespace tls { + +struct TLSSessionCache { + // ASN1 representation of SSL_SESSION object. See + // i2d_SSL_SESSION(3SSL). + std::vector<uint8_t> session_data; + // The last time stamp when this cache entry is created or updated. + ev_tstamp last_updated; +}; + +// This struct stores the additional information per SSL_CTX. This is +// attached to SSL_CTX using SSL_CTX_set_app_data(). +struct TLSContextData { + // SCT data formatted so that this can be directly sent as + // extension_data of signed_certificate_timestamp. + std::vector<uint8_t> sct_data; +#ifndef HAVE_ATOMIC_STD_SHARED_PTR + // Protects ocsp_data; + std::mutex mu; +#endif // !HAVE_ATOMIC_STD_SHARED_PTR + // OCSP response + std::shared_ptr<std::vector<uint8_t>> ocsp_data; + + // Path to certificate file + const char *cert_file; +}; + +// Create server side SSL_CTX +SSL_CTX *create_ssl_context(const char *private_key_file, const char *cert_file, + const std::vector<uint8_t> &sct_data + +#ifdef HAVE_NEVERBLEED + , + neverbleed_t *nb +#endif // HAVE_NEVERBLEED +); + +// Create client side SSL_CTX. This does not configure ALPN settings. +// |next_proto_select_cb| is for NPN. +SSL_CTX *create_ssl_client_context( +#ifdef HAVE_NEVERBLEED + neverbleed_t *nb, +#endif // HAVE_NEVERBLEED + const StringRef &cacert, const StringRef &cert_file, + const StringRef &private_key_file, + int (*next_proto_select_cb)(SSL *s, unsigned char **out, + unsigned char *outlen, const unsigned char *in, + unsigned int inlen, void *arg)); + +#ifdef ENABLE_HTTP3 +SSL_CTX *create_quic_ssl_client_context( +# ifdef HAVE_NEVERBLEED + neverbleed_t *nb, +# endif // HAVE_NEVERBLEED + const StringRef &cacert, const StringRef &cert_file, + const StringRef &private_key_file, + int (*next_proto_select_cb)(SSL *s, unsigned char **out, + unsigned char *outlen, const unsigned char *in, + unsigned int inlen, void *arg)); +#endif // ENABLE_HTTP3 + +ClientHandler *accept_connection(Worker *worker, int fd, sockaddr *addr, + int addrlen, const UpstreamAddr *faddr); + +// Check peer's certificate against given |address| and |host|. +int check_cert(SSL *ssl, const Address *addr, const StringRef &host); +// Check peer's certificate against given host name described in +// |addr| and numeric address in |raddr|. Note that |raddr| might not +// point to &addr->addr. +int check_cert(SSL *ssl, const DownstreamAddr *addr, const Address *raddr); + +struct WildcardRevPrefix { + WildcardRevPrefix(const StringRef &prefix, size_t idx) + : prefix(std::begin(prefix), std::end(prefix)), idx(idx) {} + + // "Prefix" of wildcard pattern. It is reversed from original form. + // For example, if the original wildcard is "test*.nghttp2.org", + // prefix would be "tset". + ImmutableString prefix; + // The index of SSL_CTX. See ConnectionHandler::get_ssl_ctx(). + size_t idx; +}; + +struct WildcardPattern { + // Wildcard host sharing only suffix is probably rare, so we just do + // linear search. + std::vector<WildcardRevPrefix> rev_prefix; +}; + +class CertLookupTree { +public: + CertLookupTree(); + + // Adds hostname pattern |hostname| to the lookup tree, associating + // value |index|. When the queried host matches this pattern, + // |index| is returned. We support wildcard pattern. The left most + // '*' is considered as wildcard character, and it must match at + // least one character. If the same pattern has been already added, + // this function does not alter the tree, and returns the existing + // matching index. + // + // The caller should lower-case |hostname| since this function does + // do that, and lookup function performs case-sensitive match. + // + // TODO Treat wildcard pattern described as RFC 6125. + // + // This function returns the index. It returns -1 if it fails + // (e.g., hostname is too long). If the returned index equals to + // |index|, then hostname is added to the tree with the value + // |index|. If it is not -1, and does not equal to |index|, same + // hostname has already been added to the tree. + ssize_t add_cert(const StringRef &hostname, size_t index); + + // Looks up index using the given |hostname|. The exact match takes + // precedence over wildcard match. For wildcard match, longest + // match (sum of matched suffix and prefix length in bytes) is + // preferred, breaking a tie with longer suffix. + // + // The caller should lower-case |hostname| since this function + // performs case-sensitive match. + ssize_t lookup(const StringRef &hostname); + + // Dumps the contents of this lookup tree to stderr. + void dump() const; + +private: + // Exact match + Router router_; + // Wildcard reversed suffix match. The returned index is into + // wildcard_patterns_. + Router rev_wildcard_router_; + // Stores wildcard suffix patterns. + std::vector<WildcardPattern> wildcard_patterns_; +}; + +// Adds hostnames in certificate in |ssl_ctx| to lookup tree |lt|. +// The subjectAltNames and commonName are considered as eligible +// hostname. If there is at least one dNSName in subjectAltNames, +// commonName is not considered. |ssl_ctx| is also added to +// |indexed_ssl_ctx|. This function returns 0 if it succeeds, or -1. +int cert_lookup_tree_add_ssl_ctx( + CertLookupTree *lt, std::vector<std::vector<SSL_CTX *>> &indexed_ssl_ctx, + SSL_CTX *ssl_ctx); + +// Returns true if |proto| is included in the +// protocol list |protos|. +bool in_proto_list(const std::vector<StringRef> &protos, + const StringRef &proto); + +// Returns true if security requirement for HTTP/2 is fulfilled. +bool check_http2_requirement(SSL *ssl); + +// Returns SSL/TLS option mask to disable SSL/TLS protocol version not +// included in |tls_proto_list|. The returned mask can be directly +// passed to SSL_CTX_set_options(). +long int create_tls_proto_mask(const std::vector<StringRef> &tls_proto_list); + +int set_alpn_prefs(std::vector<unsigned char> &out, + const std::vector<StringRef> &protos); + +// Setups server side SSL_CTX. This function inspects get_config() +// and if upstream_no_tls is true, returns nullptr. Otherwise +// construct default SSL_CTX. If subcerts are available +// (get_config()->subcerts), caller should provide CertLookupTree +// object as |cert_tree| parameter, otherwise SNI does not work. All +// the created SSL_CTX is stored into |all_ssl_ctx|. They are also +// added to |indexed_ssl_ctx|. |cert_tree| uses its index to +// associate hostname to the SSL_CTX. +SSL_CTX * +setup_server_ssl_context(std::vector<SSL_CTX *> &all_ssl_ctx, + std::vector<std::vector<SSL_CTX *>> &indexed_ssl_ctx, + CertLookupTree *cert_tree +#ifdef HAVE_NEVERBLEED + , + neverbleed_t *nb +#endif // HAVE_NEVERBLEED +); + +#ifdef ENABLE_HTTP3 +SSL_CTX *setup_quic_server_ssl_context( + std::vector<SSL_CTX *> &all_ssl_ctx, + std::vector<std::vector<SSL_CTX *>> &indexed_ssl_ctx, + CertLookupTree *cert_tree +# ifdef HAVE_NEVERBLEED + , + neverbleed_t *nb +# endif // HAVE_NEVERBLEED +); +#endif // ENABLE_HTTP3 + +// Setups client side SSL_CTX. +SSL_CTX *setup_downstream_client_ssl_context( +#ifdef HAVE_NEVERBLEED + neverbleed_t *nb +#endif // HAVE_NEVERBLEED +); + +// Sets ALPN settings in |SSL| suitable for HTTP/2 use. +void setup_downstream_http2_alpn(SSL *ssl); +// Sets ALPN settings in |SSL| suitable for HTTP/1.1 use. +void setup_downstream_http1_alpn(SSL *ssl); + +// Creates CertLookupTree. If frontend is configured not to use TLS, +// this function returns nullptr. +std::unique_ptr<CertLookupTree> create_cert_lookup_tree(); + +SSL *create_ssl(SSL_CTX *ssl_ctx); + +// Returns true if SSL/TLS is enabled on upstream +bool upstream_tls_enabled(const ConnectionConfig &connconf); + +// Performs TLS hostname match. |pattern| can contain wildcard +// character '*', which matches prefix of target hostname. There are +// several restrictions to make wildcard work. The matching algorithm +// is based on RFC 6125. +bool tls_hostname_match(const StringRef &pattern, const StringRef &hostname); + +// Caches |session|. |session| is serialized into ASN1 +// representation, and stored. |t| is used as a time stamp. +// Depending on the existing cache's time stamp, |session| might not +// be cached. +void try_cache_tls_session(TLSSessionCache *cache, SSL_SESSION *session, + ev_tstamp t); + +// Returns cached session associated |addr|. If no cache entry is +// found associated to |addr|, nullptr will be returned. +SSL_SESSION *reuse_tls_session(const TLSSessionCache &addr); + +// Loads certificate form file |filename|. The caller should delete +// the returned object using X509_free(). +X509 *load_certificate(const char *filename); + +// Returns TLS version from |v|. The returned value is defined in +// OpenSSL header file. This function returns -1 if |v| is not valid +// TLS version string. +int proto_version_from_string(const StringRef &v); + +// Verifies OCSP response |ocsp_resp| of length |ocsp_resplen|. This +// function returns 0 if it succeeds, or -1. +int verify_ocsp_response(SSL_CTX *ssl_ctx, const uint8_t *ocsp_resp, + size_t ocsp_resplen); + +// Stores fingerprint of |x| in |dst| of length |dstlen|. |md| +// specifies hash function to use, and |dstlen| must be large enough +// to include hash value (e.g., 32 bytes for SHA-256). This function +// returns the number of bytes written in |dst|, or -1. +ssize_t get_x509_fingerprint(uint8_t *dst, size_t dstlen, const X509 *x, + const EVP_MD *md); + +// Returns subject name of |x|. If this function fails to get subject +// name, it returns an empty string. +StringRef get_x509_subject_name(BlockAllocator &balloc, X509 *x); + +// Returns issuer name of |x|. If this function fails to get issuer +// name, it returns an empty string. +StringRef get_x509_issuer_name(BlockAllocator &balloc, X509 *x); + +// Returns serial number of |x|. If this function fails to get serial +// number, it returns an empty string. number +StringRef get_x509_serial(BlockAllocator &balloc, X509 *x); + +// Fills NotBefore of |x| in |t|. This function returns 0 if it +// succeeds, or -1. +int get_x509_not_before(time_t &t, X509 *x); + +// Fills NotAfter of |x| in |t|. This function returns 0 if it +// succeeds, or -1. +int get_x509_not_after(time_t &t, X509 *x); + +} // namespace tls + +} // namespace shrpx + +#endif // SHRPX_TLS_H |