diff options
Diffstat (limited to 'modules/tls/tls_cert.c')
| -rw-r--r-- | modules/tls/tls_cert.c | 564 |
1 files changed, 564 insertions, 0 deletions
diff --git a/modules/tls/tls_cert.c b/modules/tls/tls_cert.c new file mode 100644 index 0000000..624535a --- /dev/null +++ b/modules/tls/tls_cert.c @@ -0,0 +1,564 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include <assert.h> +#include <apr_lib.h> +#include <apr_encode.h> +#include <apr_strings.h> + +#include <httpd.h> +#include <http_connection.h> +#include <http_core.h> +#include <http_log.h> + +#include <rustls.h> + +#include "tls_cert.h" +#include "tls_util.h" + +extern module AP_MODULE_DECLARE_DATA tls_module; +APLOG_USE_MODULE(tls); + + +apr_status_t tls_cert_load_pem( + apr_pool_t *p, const tls_cert_spec_t *cert, tls_cert_pem_t **ppem) +{ + apr_status_t rv; + const char *fpath; + tls_cert_pem_t *cpem; + + ap_assert(cert->cert_file); + cpem = apr_pcalloc(p, sizeof(*cpem)); + fpath = ap_server_root_relative(p, cert->cert_file); + if (NULL == fpath) { + rv = APR_ENOENT; goto cleanup; + } + rv = tls_util_file_load(p, fpath, 0, 100*1024, &cpem->cert_pem); + if (APR_SUCCESS != rv) goto cleanup; + + if (cert->pkey_file) { + fpath = ap_server_root_relative(p, cert->pkey_file); + if (NULL == fpath) { + rv = APR_ENOENT; goto cleanup; + } + rv = tls_util_file_load(p, fpath, 0, 100*1024, &cpem->pkey_pem); + if (APR_SUCCESS != rv) goto cleanup; + } + else { + cpem->pkey_pem = cpem->cert_pem; + } +cleanup: + *ppem = (APR_SUCCESS == rv)? cpem : NULL; + return rv; +} + +#define PEM_IN_CHUNK 48 /* PEM demands at most 64 chars per line */ + +static apr_status_t tls_der_to_pem( + const char **ppem, apr_pool_t *p, + const unsigned char *der_data, apr_size_t der_len, + const char *header, const char *footer) +{ + apr_status_t rv = APR_SUCCESS; + char *pem = NULL, *s; + apr_size_t b64_len, n, hd_len, ft_len; + apr_ssize_t in_len, i; + + if (der_len > INT_MAX) { + rv = APR_ENOMEM; + goto cleanup; + } + in_len = (apr_ssize_t)der_len; + rv = apr_encode_base64(NULL, (const char*)der_data, in_len, APR_ENCODE_NONE, &b64_len); + if (APR_SUCCESS != rv) goto cleanup; + if (b64_len > INT_MAX) { + rv = APR_ENOMEM; + goto cleanup; + } + hd_len = header? strlen(header) : 0; + ft_len = footer? strlen(footer) : 0; + s = pem = apr_pcalloc(p, + + b64_len + (der_len/PEM_IN_CHUNK) + 1 /* \n per chunk */ + + hd_len +1 + ft_len + 1 /* adding \n */ + + 1); /* NUL-terminated */ + if (header) { + strcpy(s, header); + s += hd_len; + *s++ = '\n'; + } + for (i = 0; in_len > 0; i += PEM_IN_CHUNK, in_len -= PEM_IN_CHUNK) { + rv = apr_encode_base64(s, + (const char*)der_data + i, in_len > PEM_IN_CHUNK? PEM_IN_CHUNK : in_len, + APR_ENCODE_NONE, &n); + s += n; + *s++ = '\n'; + } + if (footer) { + strcpy(s, footer); + s += ft_len; + *s++ = '\n'; + } +cleanup: + *ppem = (APR_SUCCESS == rv)? pem : NULL; + return rv; +} + +#define PEM_CERT_HD "-----BEGIN CERTIFICATE-----" +#define PEM_CERT_FT "-----END CERTIFICATE-----" + +apr_status_t tls_cert_to_pem(const char **ppem, apr_pool_t *p, const rustls_certificate *cert) +{ + const unsigned char* der_data; + size_t der_len; + rustls_result rr = RUSTLS_RESULT_OK; + apr_status_t rv = APR_SUCCESS; + const char *pem = NULL; + + rr = rustls_certificate_get_der(cert, &der_data, &der_len); + if (RUSTLS_RESULT_OK != rr) goto cleanup; + rv = tls_der_to_pem(&pem, p, der_data, der_len, PEM_CERT_HD, PEM_CERT_FT); +cleanup: + if (RUSTLS_RESULT_OK != rr) { + rv = tls_util_rustls_error(p, rr, NULL); + } + *ppem = (APR_SUCCESS == rv)? pem : NULL; + return rv; +} + +static void nullify_key_pem(tls_cert_pem_t *pems) +{ + if (pems->pkey_pem.len) { + memset((void*)pems->pkey_pem.data, 0, pems->pkey_pem.len); + } +} + +static apr_status_t make_certified_key( + apr_pool_t *p, const char *name, + const tls_data_t *cert_pem, const tls_data_t *pkey_pem, + const rustls_certified_key **pckey) +{ + const rustls_certified_key *ckey = NULL; + rustls_result rr = RUSTLS_RESULT_OK; + apr_status_t rv = APR_SUCCESS; + + rr = rustls_certified_key_build( + cert_pem->data, cert_pem->len, + pkey_pem->data, pkey_pem->len, + &ckey); + + if (RUSTLS_RESULT_OK != rr) { + const char *err_descr; + rv = tls_util_rustls_error(p, rr, &err_descr); + ap_log_perror(APLOG_MARK, APLOG_ERR, rv, p, APLOGNO(10363) + "Failed to load certified key %s: [%d] %s", + name, (int)rr, err_descr); + } + if (APR_SUCCESS == rv) { + *pckey = ckey; + } + else if (ckey) { + rustls_certified_key_free(ckey); + } + return rv; +} + +apr_status_t tls_cert_load_cert_key( + apr_pool_t *p, const tls_cert_spec_t *spec, + const char **pcert_pem, const rustls_certified_key **pckey) +{ + apr_status_t rv = APR_SUCCESS; + + if (spec->cert_file) { + tls_cert_pem_t *pems; + + rv = tls_cert_load_pem(p, spec, &pems); + if (APR_SUCCESS != rv) goto cleanup; + if (pcert_pem) *pcert_pem = tls_data_to_str(p, &pems->cert_pem); + rv = make_certified_key(p, spec->cert_file, &pems->cert_pem, &pems->pkey_pem, pckey); + /* dont want them hanging around in memory unnecessarily. */ + nullify_key_pem(pems); + } + else if (spec->cert_pem) { + tls_data_t pkey_pem, pem; + pem = tls_data_from_str(spec->cert_pem); + if (spec->pkey_pem) { + pkey_pem = tls_data_from_str(spec->pkey_pem); + } + else { + pkey_pem = pem; + } + if (pcert_pem) *pcert_pem = spec->cert_pem; + rv = make_certified_key(p, "memory", &pem, &pkey_pem, pckey); + /* pems provided from outside are responsibility of the caller */ + } + else { + rv = APR_ENOENT; goto cleanup; + } +cleanup: + return rv; +} + +typedef struct { + const char *id; + const char *cert_pem; + server_rec *server; + const rustls_certified_key *certified_key; +} tls_cert_reg_entry_t; + +static int reg_entry_cleanup(void *ctx, const void *key, apr_ssize_t klen, const void *val) +{ + tls_cert_reg_entry_t *entry = (tls_cert_reg_entry_t*)val; + (void)ctx; (void)key; (void)klen; + if (entry->certified_key) { + rustls_certified_key_free(entry->certified_key); + entry->certified_key = NULL; + } + return 1; +} + +static apr_status_t reg_cleanup(void *data) +{ + tls_cert_reg_t *reg = data; + if (reg->id2entry) { + apr_hash_do(reg_entry_cleanup, reg, reg->id2entry); + apr_hash_clear(reg->id2entry); + if (reg->key2entry) apr_hash_clear(reg->key2entry); + } + return APR_SUCCESS; +} + +tls_cert_reg_t *tls_cert_reg_make(apr_pool_t *p) +{ + tls_cert_reg_t *reg; + + reg = apr_pcalloc(p, sizeof(*reg)); + reg->pool = p; + reg->id2entry = apr_hash_make(p); + reg->key2entry = apr_hash_make(p); + apr_pool_cleanup_register(p, reg, reg_cleanup, apr_pool_cleanup_null); + return reg; +} + +apr_size_t tls_cert_reg_count(tls_cert_reg_t *reg) +{ + return apr_hash_count(reg->id2entry); +} + +static const char *cert_spec_to_id(const tls_cert_spec_t *spec) +{ + if (spec->cert_file) return spec->cert_file; + if (spec->cert_pem) return spec->cert_pem; + return NULL; +} + +apr_status_t tls_cert_reg_get_certified_key( + tls_cert_reg_t *reg, server_rec *s, const tls_cert_spec_t *spec, + const rustls_certified_key **pckey) +{ + apr_status_t rv = APR_SUCCESS; + const char *id; + tls_cert_reg_entry_t *entry; + + id = cert_spec_to_id(spec); + assert(id); + entry = apr_hash_get(reg->id2entry, id, APR_HASH_KEY_STRING); + if (!entry) { + const rustls_certified_key *certified_key; + const char *cert_pem; + rv = tls_cert_load_cert_key(reg->pool, spec, &cert_pem, &certified_key); + if (APR_SUCCESS != rv) goto cleanup; + entry = apr_pcalloc(reg->pool, sizeof(*entry)); + entry->id = apr_pstrdup(reg->pool, id); + entry->cert_pem = cert_pem; + entry->server = s; + entry->certified_key = certified_key; + apr_hash_set(reg->id2entry, entry->id, APR_HASH_KEY_STRING, entry); + /* associates the pointer value */ + apr_hash_set(reg->key2entry, &entry->certified_key, sizeof(entry->certified_key), entry); + } + +cleanup: + if (APR_SUCCESS == rv) { + *pckey = entry->certified_key; + } + else { + *pckey = NULL; + } + return rv; +} + +typedef struct { + void *userdata; + tls_cert_reg_visitor *visitor; +} reg_visit_ctx_t; + +static int reg_visit(void *vctx, const void *key, apr_ssize_t klen, const void *val) +{ + reg_visit_ctx_t *ctx = vctx; + tls_cert_reg_entry_t *entry = (tls_cert_reg_entry_t*)val; + + (void)key; (void)klen; + return ctx->visitor(ctx->userdata, entry->server, entry->id, entry->cert_pem, entry->certified_key); +} + +void tls_cert_reg_do( + tls_cert_reg_visitor *visitor, void *userdata, tls_cert_reg_t *reg) +{ + reg_visit_ctx_t ctx; + ctx.visitor = visitor; + ctx.userdata = userdata; + apr_hash_do(reg_visit, &ctx, reg->id2entry); +} + +const char *tls_cert_reg_get_id(tls_cert_reg_t *reg, const rustls_certified_key *certified_key) +{ + tls_cert_reg_entry_t *entry; + + entry = apr_hash_get(reg->key2entry, &certified_key, sizeof(certified_key)); + return entry? entry->id : NULL; +} + +apr_status_t tls_cert_load_root_store( + apr_pool_t *p, const char *store_file, rustls_root_cert_store **pstore) +{ + const char *fpath; + tls_data_t pem; + rustls_root_cert_store *store = NULL; + rustls_result rr = RUSTLS_RESULT_OK; + apr_pool_t *ptemp = NULL; + apr_status_t rv; + + ap_assert(store_file); + + rv = apr_pool_create(&ptemp, p); + if (APR_SUCCESS != rv) goto cleanup; + apr_pool_tag(ptemp, "tls_load_root_cert_store"); + fpath = ap_server_root_relative(ptemp, store_file); + if (NULL == fpath) { + rv = APR_ENOENT; goto cleanup; + } + /* we use this for client auth CAs. 1MB seems large enough. */ + rv = tls_util_file_load(ptemp, fpath, 0, 1024*1024, &pem); + if (APR_SUCCESS != rv) goto cleanup; + + store = rustls_root_cert_store_new(); + rr = rustls_root_cert_store_add_pem(store, pem.data, pem.len, 1); + if (RUSTLS_RESULT_OK != rr) goto cleanup; + +cleanup: + if (RUSTLS_RESULT_OK != rr) { + const char *err_descr; + rv = tls_util_rustls_error(p, rr, &err_descr); + ap_log_perror(APLOG_MARK, APLOG_ERR, rv, p, APLOGNO(10364) + "Failed to load root store %s: [%d] %s", + store_file, (int)rr, err_descr); + } + if (APR_SUCCESS == rv) { + *pstore = store; + } + else { + *pstore = NULL; + if (store) rustls_root_cert_store_free(store); + } + if (ptemp) apr_pool_destroy(ptemp); + return rv; +} + +typedef struct { + const char *id; + rustls_root_cert_store *store; +} tls_cert_root_stores_entry_t; + +static int stores_entry_cleanup(void *ctx, const void *key, apr_ssize_t klen, const void *val) +{ + tls_cert_root_stores_entry_t *entry = (tls_cert_root_stores_entry_t*)val; + (void)ctx; (void)key; (void)klen; + if (entry->store) { + rustls_root_cert_store_free(entry->store); + entry->store = NULL; + } + return 1; +} + +static apr_status_t stores_cleanup(void *data) +{ + tls_cert_root_stores_t *stores = data; + tls_cert_root_stores_clear(stores); + return APR_SUCCESS; +} + +tls_cert_root_stores_t *tls_cert_root_stores_make(apr_pool_t *p) +{ + tls_cert_root_stores_t *stores; + + stores = apr_pcalloc(p, sizeof(*stores)); + stores->pool = p; + stores->file2store = apr_hash_make(p); + apr_pool_cleanup_register(p, stores, stores_cleanup, apr_pool_cleanup_null); + return stores; +} + +void tls_cert_root_stores_clear(tls_cert_root_stores_t *stores) +{ + if (stores->file2store) { + apr_hash_do(stores_entry_cleanup, stores, stores->file2store); + apr_hash_clear(stores->file2store); + } +} + +apr_status_t tls_cert_root_stores_get( + tls_cert_root_stores_t *stores, + const char *store_file, + rustls_root_cert_store **pstore) +{ + apr_status_t rv = APR_SUCCESS; + tls_cert_root_stores_entry_t *entry; + + entry = apr_hash_get(stores->file2store, store_file, APR_HASH_KEY_STRING); + if (!entry) { + rustls_root_cert_store *store; + rv = tls_cert_load_root_store(stores->pool, store_file, &store); + if (APR_SUCCESS != rv) goto cleanup; + entry = apr_pcalloc(stores->pool, sizeof(*entry)); + entry->id = apr_pstrdup(stores->pool, store_file); + entry->store = store; + apr_hash_set(stores->file2store, entry->id, APR_HASH_KEY_STRING, entry); + } + +cleanup: + if (APR_SUCCESS == rv) { + *pstore = entry->store; + } + else { + *pstore = NULL; + } + return rv; +} + +typedef struct { + const char *id; + const rustls_client_cert_verifier *client_verifier; + const rustls_client_cert_verifier_optional *client_verifier_opt; +} tls_cert_verifiers_entry_t; + +static int verifiers_entry_cleanup(void *ctx, const void *key, apr_ssize_t klen, const void *val) +{ + tls_cert_verifiers_entry_t *entry = (tls_cert_verifiers_entry_t*)val; + (void)ctx; (void)key; (void)klen; + if (entry->client_verifier) { + rustls_client_cert_verifier_free(entry->client_verifier); + entry->client_verifier = NULL; + } + if (entry->client_verifier_opt) { + rustls_client_cert_verifier_optional_free(entry->client_verifier_opt); + entry->client_verifier_opt = NULL; + } + return 1; +} + +static apr_status_t verifiers_cleanup(void *data) +{ + tls_cert_verifiers_t *verifiers = data; + tls_cert_verifiers_clear(verifiers); + return APR_SUCCESS; +} + +tls_cert_verifiers_t *tls_cert_verifiers_make( + apr_pool_t *p, tls_cert_root_stores_t *stores) +{ + tls_cert_verifiers_t *verifiers; + + verifiers = apr_pcalloc(p, sizeof(*verifiers)); + verifiers->pool = p; + verifiers->stores = stores; + verifiers->file2verifier = apr_hash_make(p); + apr_pool_cleanup_register(p, verifiers, verifiers_cleanup, apr_pool_cleanup_null); + return verifiers; +} + +void tls_cert_verifiers_clear(tls_cert_verifiers_t *verifiers) +{ + if (verifiers->file2verifier) { + apr_hash_do(verifiers_entry_cleanup, verifiers, verifiers->file2verifier); + apr_hash_clear(verifiers->file2verifier); + } +} + +static tls_cert_verifiers_entry_t * verifiers_get_or_make_entry( + tls_cert_verifiers_t *verifiers, + const char *store_file) +{ + tls_cert_verifiers_entry_t *entry; + + entry = apr_hash_get(verifiers->file2verifier, store_file, APR_HASH_KEY_STRING); + if (!entry) { + entry = apr_pcalloc(verifiers->pool, sizeof(*entry)); + entry->id = apr_pstrdup(verifiers->pool, store_file); + apr_hash_set(verifiers->file2verifier, entry->id, APR_HASH_KEY_STRING, entry); + } + return entry; +} + +apr_status_t tls_cert_client_verifiers_get( + tls_cert_verifiers_t *verifiers, + const char *store_file, + const rustls_client_cert_verifier **pverifier) +{ + apr_status_t rv = APR_SUCCESS; + tls_cert_verifiers_entry_t *entry; + + entry = verifiers_get_or_make_entry(verifiers, store_file); + if (!entry->client_verifier) { + rustls_root_cert_store *store; + rv = tls_cert_root_stores_get(verifiers->stores, store_file, &store); + if (APR_SUCCESS != rv) goto cleanup; + entry->client_verifier = rustls_client_cert_verifier_new(store); + } + +cleanup: + if (APR_SUCCESS == rv) { + *pverifier = entry->client_verifier; + } + else { + *pverifier = NULL; + } + return rv; +} + +apr_status_t tls_cert_client_verifiers_get_optional( + tls_cert_verifiers_t *verifiers, + const char *store_file, + const rustls_client_cert_verifier_optional **pverifier) +{ + apr_status_t rv = APR_SUCCESS; + tls_cert_verifiers_entry_t *entry; + + entry = verifiers_get_or_make_entry(verifiers, store_file); + if (!entry->client_verifier_opt) { + rustls_root_cert_store *store; + rv = tls_cert_root_stores_get(verifiers->stores, store_file, &store); + if (APR_SUCCESS != rv) goto cleanup; + entry->client_verifier_opt = rustls_client_cert_verifier_optional_new(store); + } + +cleanup: + if (APR_SUCCESS == rv) { + *pverifier = entry->client_verifier_opt; + } + else { + *pverifier = NULL; + } + return rv; +} |