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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#include "authz_curl.h" |
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| 6 |
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#include <openssl/err.h> |
| 7 |
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#include <openssl/ssl.h> |
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#include <pthread.h> |
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| 10 |
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#include <cassert> |
| 11 |
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#include <memory> |
| 12 |
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#include "authz/authz_session.h" |
| 14 |
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#include "crypto/openssl_version.h" |
| 15 |
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#include "duplex_curl.h" |
| 16 |
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#include "util/concurrency.h" |
| 17 |
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#include "util/logging.h" |
| 18 |
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| 19 |
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using namespace std; // NOLINT |
| 20 |
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| 22 |
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namespace { |
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| 24 |
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struct sslctx_info { |
| 25 |
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✗ |
sslctx_info() : chain(NULL), pkey(NULL) { } |
| 26 |
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STACK_OF(X509) * chain; |
| 28 |
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EVP_PKEY *pkey; |
| 29 |
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}; |
| 30 |
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| 31 |
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struct bearer_info { |
| 32 |
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/** |
| 33 |
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* List of extra headers to put on the HTTP request. This is required |
| 34 |
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* in order to add the "Authorization: Bearer XXXXX" header. |
| 35 |
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*/ |
| 36 |
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struct curl_slist *list; |
| 37 |
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| 38 |
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/** |
| 39 |
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* Actual text of the bearer token |
| 40 |
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*/ |
| 41 |
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char *token; |
| 42 |
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}; |
| 43 |
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} // anonymous namespace |
| 44 |
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| 45 |
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| 46 |
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bool AuthzAttachment::ssl_strings_loaded_ = false; |
| 47 |
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| 48 |
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| 49 |
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661 |
AuthzAttachment::AuthzAttachment(AuthzSessionManager *sm) |
| 50 |
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661 |
: authz_session_manager_(sm) { |
| 51 |
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// Required for logging OpenSSL errors |
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1/2
✓ Branch 1 taken 661 times.
✗ Branch 2 not taken.
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SSL_load_error_strings(); |
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ssl_strings_loaded_ = true; |
| 54 |
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661 |
} |
| 55 |
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| 56 |
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| 57 |
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CURLcode AuthzAttachment::CallbackSslCtx(CURL *curl, void *sslctx, void *parm) { |
| 58 |
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sslctx_info *p = reinterpret_cast<sslctx_info *>(parm); |
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SSL_CTX *ctx = reinterpret_cast<SSL_CTX *>(sslctx); |
| 60 |
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| 61 |
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if (parm == NULL) |
| 62 |
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return CURLE_OK; |
| 63 |
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| 64 |
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STACK_OF(X509) *chain = p->chain; |
| 65 |
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EVP_PKEY *pkey = p->pkey; |
| 66 |
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| 67 |
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LogCvmfs(kLogAuthz, kLogDebug, "Customizing OpenSSL context."); |
| 68 |
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| 69 |
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const int cert_count = sk_X509_num(chain); |
| 70 |
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if (cert_count == 0) { |
| 71 |
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LogOpenSSLErrors("No certificate found in chain."); |
| 72 |
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} |
| 73 |
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X509 *cert = sk_X509_value(chain, 0); |
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| 75 |
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// NOTE: SSL_CTX_use_certificate and _user_PrivateKey increase the ref count. |
| 76 |
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if (!SSL_CTX_use_certificate(ctx, cert)) { |
| 77 |
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LogOpenSSLErrors("Failed to set the user certificate in the SSL " |
| 78 |
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"connection"); |
| 79 |
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return CURLE_SSL_CERTPROBLEM; |
| 80 |
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} |
| 81 |
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| 82 |
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if (!SSL_CTX_use_PrivateKey(ctx, pkey)) { |
| 83 |
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LogOpenSSLErrors("Failed to set the private key in the SSL connection"); |
| 84 |
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return CURLE_SSL_CERTPROBLEM; |
| 85 |
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} |
| 86 |
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| 87 |
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if (!SSL_CTX_check_private_key(ctx)) { |
| 88 |
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LogOpenSSLErrors("Provided certificate and key do not match"); |
| 89 |
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return CURLE_SSL_CERTPROBLEM; |
| 90 |
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} else { |
| 91 |
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LogCvmfs(kLogAuthz, kLogDebug, "Client certificate and key match."); |
| 92 |
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} |
| 93 |
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| 94 |
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// NOTE: SSL_CTX_add_extra_chain_cert DOES NOT increase the ref count |
| 95 |
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// Instead, it now owns the pointer. THIS IS DIFFERENT FROM ABOVE. |
| 96 |
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for (int idx = 1; idx < cert_count; idx++) { |
| 97 |
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✗ |
cert = sk_X509_value(chain, idx); |
| 98 |
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✗ |
if (!SSL_CTX_add_extra_chain_cert(ctx, X509_dup(cert))) { |
| 99 |
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LogOpenSSLErrors("Failed to add client cert to chain"); |
| 100 |
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} |
| 101 |
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} |
| 102 |
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| 103 |
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return CURLE_OK; |
| 104 |
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} |
| 105 |
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| 106 |
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| 107 |
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bool AuthzAttachment::ConfigureSciTokenCurl(CURL *curl_handle, |
| 108 |
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const AuthzToken &token, |
| 109 |
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void **info_data) { |
| 110 |
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✗ |
if (*info_data == NULL) { |
| 111 |
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✗ |
AuthzToken *saved_token = new AuthzToken(); |
| 112 |
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✗ |
saved_token->type = kTokenBearer; |
| 113 |
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saved_token->data = new bearer_info; |
| 114 |
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bearer_info *bearer = static_cast<bearer_info *>(saved_token->data); |
| 115 |
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✗ |
bearer->list = NULL; |
| 116 |
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bearer->token = static_cast<char *>( |
| 117 |
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smalloc((sizeof(char) * token.size) + 1)); |
| 118 |
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memcpy(bearer->token, token.data, token.size); |
| 119 |
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✗ |
static_cast<char *>(bearer->token)[token.size] = 0; |
| 120 |
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✗ |
*info_data = saved_token; |
| 121 |
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} |
| 122 |
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| 123 |
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AuthzToken *tmp_token = static_cast<AuthzToken *>(*info_data); |
| 124 |
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✗ |
bearer_info *bearer = static_cast<bearer_info *>(tmp_token->data); |
| 125 |
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| 126 |
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LogCvmfs(kLogAuthz, kLogDebug, "Setting OAUTH bearer token to: %s", |
| 127 |
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✗ |
static_cast<char *>(bearer->token)); |
| 128 |
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| 129 |
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// Create the Bearer token |
| 130 |
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// The CURLOPT_XOAUTH2_BEARER option only works "IMAP, POP3 and SMTP" |
| 131 |
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// protocols. Not HTTPS |
| 132 |
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const std::string auth_preamble = "Authorization: Bearer "; |
| 133 |
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const std::string auth_header = auth_preamble |
| 134 |
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+ static_cast<char *>(bearer->token); |
| 135 |
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✗ |
bearer->list = curl_slist_append(bearer->list, auth_header.c_str()); |
| 136 |
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const int retval = curl_easy_setopt(curl_handle, CURLOPT_HTTPHEADER, |
| 137 |
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bearer->list); |
| 138 |
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| 139 |
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✗ |
if (retval != CURLE_OK) { |
| 140 |
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LogCvmfs(kLogAuthz, kLogSyslogErr, "Failed to set Oauth2 Bearer Token"); |
| 141 |
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return false; |
| 142 |
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} |
| 143 |
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| 144 |
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return true; |
| 145 |
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} |
| 146 |
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| 147 |
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| 148 |
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✗ |
bool AuthzAttachment::ConfigureCurlHandle(CURL *curl_handle, |
| 149 |
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pid_t pid, |
| 150 |
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void **info_data) { |
| 151 |
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✗ |
assert(info_data); |
| 152 |
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| 153 |
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// File catalog has no membership requirement, no tokens to attach |
| 154 |
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if (membership_.empty()) |
| 155 |
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return false; |
| 156 |
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| 157 |
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// We cannot rely on libcurl to pipeline (yet), as cvmfs may |
| 158 |
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// bounce between different auth handles. |
| 159 |
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curl_easy_setopt(curl_handle, CURLOPT_FRESH_CONNECT, 1); |
| 160 |
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curl_easy_setopt(curl_handle, CURLOPT_FORBID_REUSE, 1); |
| 161 |
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curl_easy_setopt(curl_handle, CURLOPT_SSL_SESSIONID_CACHE, 0); |
| 162 |
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| 163 |
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const std::unique_ptr<AuthzToken> token( |
| 164 |
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✗ |
authz_session_manager_->GetTokenCopy(pid, membership_)); |
| 165 |
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✗ |
if (token.get() == nullptr) { |
| 166 |
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LogCvmfs(kLogAuthz, kLogDebug, "failed to get authz token for pid %d", pid); |
| 167 |
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return false; |
| 168 |
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} |
| 169 |
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| 170 |
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✗ |
switch (token->type) { |
| 171 |
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✗ |
case kTokenBearer: |
| 172 |
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// If it's a scitoken, then just go to the private |
| 173 |
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// ConfigureSciTokenCurl function |
| 174 |
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return ConfigureSciTokenCurl(curl_handle, *token, info_data); |
| 175 |
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| 176 |
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case kTokenX509: |
| 177 |
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// The x509 code is below, so just break and go. |
| 178 |
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break; |
| 179 |
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| 180 |
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default: |
| 181 |
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// Oh no, don't know the the token type, throw error and return |
| 182 |
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LogCvmfs(kLogAuthz, kLogDebug, "unknown token type: %d", token->type); |
| 183 |
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return false; |
| 184 |
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} |
| 185 |
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| 186 |
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✗ |
curl_easy_setopt(curl_handle, CURLOPT_SSL_CTX_DATA, NULL); |
| 187 |
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| 188 |
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// The calling layer is reusing data; |
| 189 |
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✗ |
if (*info_data) { |
| 190 |
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curl_easy_setopt(curl_handle, CURLOPT_SSL_CTX_DATA, |
| 191 |
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static_cast<AuthzToken *>(*info_data)->data); |
| 192 |
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✗ |
return true; |
| 193 |
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} |
| 194 |
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| 195 |
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| 196 |
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✗ |
int retval = curl_easy_setopt(curl_handle, CURLOPT_SSL_CTX_FUNCTION, |
| 197 |
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CallbackSslCtx); |
| 198 |
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✗ |
if (retval != CURLE_OK) { |
| 199 |
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✗ |
LogCvmfs(kLogAuthz, kLogDebug, "cannot configure curl ssl callback"); |
| 200 |
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✗ |
return false; |
| 201 |
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} |
| 202 |
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| 203 |
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✗ |
std::unique_ptr<sslctx_info> parm(new sslctx_info); |
| 204 |
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| 205 |
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✗ |
STACK_OF(X509_INFO) *sk = NULL; |
| 206 |
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✗ |
STACK_OF(X509) *certstack = sk_X509_new_null(); |
| 207 |
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✗ |
parm->chain = certstack; |
| 208 |
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✗ |
if (certstack == NULL) { |
| 209 |
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✗ |
LogCvmfs(kLogAuthz, kLogSyslogErr, "Failed to allocate new X509 chain."); |
| 210 |
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✗ |
return false; |
| 211 |
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} |
| 212 |
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| 213 |
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✗ |
BIO *bio_token = BIO_new_mem_buf(token->data, token->size); |
| 214 |
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✗ |
assert(bio_token != NULL); |
| 215 |
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✗ |
sk = PEM_X509_INFO_read_bio(bio_token, NULL, NULL, NULL); |
| 216 |
|
✗ |
BIO_free(bio_token); |
| 217 |
|
✗ |
if (!sk) { |
| 218 |
|
✗ |
LogOpenSSLErrors("Failed to load credential file."); |
| 219 |
|
✗ |
sk_X509_INFO_free(sk); |
| 220 |
|
✗ |
sk_X509_free(certstack); |
| 221 |
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✗ |
return false; |
| 222 |
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} |
| 223 |
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| 224 |
|
✗ |
while (sk_X509_INFO_num(sk)) { |
| 225 |
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✗ |
X509_INFO *xi = sk_X509_INFO_shift(sk); |
| 226 |
|
✗ |
if (xi == NULL) { |
| 227 |
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✗ |
continue; |
| 228 |
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} |
| 229 |
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✗ |
if (xi->x509 != NULL) { |
| 230 |
|
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#ifdef OPENSSL_API_INTERFACE_V11 |
| 231 |
|
✗ |
retval = X509_up_ref(xi->x509); |
| 232 |
|
✗ |
assert(retval == 1); |
| 233 |
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#else |
| 234 |
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CRYPTO_add(&xi->x509->references, 1, CRYPTO_LOCK_X509); |
| 235 |
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#endif |
| 236 |
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✗ |
sk_X509_push(certstack, xi->x509); |
| 237 |
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} |
| 238 |
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✗ |
if ((xi->x_pkey != NULL) && (xi->x_pkey->dec_pkey != NULL)) { |
| 239 |
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✗ |
parm->pkey = xi->x_pkey->dec_pkey; |
| 240 |
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#ifdef OPENSSL_API_INTERFACE_V11 |
| 241 |
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✗ |
retval = EVP_PKEY_up_ref(parm->pkey); |
| 242 |
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✗ |
assert(retval == 1); |
| 243 |
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#else |
| 244 |
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CRYPTO_add(&parm->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY); |
| 245 |
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#endif |
| 246 |
|
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} |
| 247 |
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✗ |
X509_INFO_free(xi); |
| 248 |
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} |
| 249 |
|
✗ |
sk_X509_INFO_free(sk); |
| 250 |
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| 251 |
|
✗ |
if (parm->pkey == NULL) { |
| 252 |
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// Sigh - PEM_X509_INFO_read doesn't understand old key encodings. |
| 253 |
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// Try a more general-purpose function. |
| 254 |
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✗ |
BIO *bio_token = BIO_new_mem_buf(token->data, token->size); |
| 255 |
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✗ |
assert(bio_token != NULL); |
| 256 |
|
✗ |
EVP_PKEY *old_pkey = PEM_read_bio_PrivateKey(bio_token, NULL, NULL, NULL); |
| 257 |
|
✗ |
BIO_free(bio_token); |
| 258 |
|
✗ |
if (old_pkey) { |
| 259 |
|
✗ |
parm->pkey = old_pkey; |
| 260 |
|
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} else { |
| 261 |
|
✗ |
sk_X509_free(certstack); |
| 262 |
|
✗ |
LogCvmfs(kLogAuthz, kLogSyslogErr, |
| 263 |
|
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"credential did not contain a decrypted private key."); |
| 264 |
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✗ |
return false; |
| 265 |
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} |
| 266 |
|
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} |
| 267 |
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| 268 |
|
✗ |
if (!sk_X509_num(certstack)) { |
| 269 |
|
✗ |
EVP_PKEY_free(parm->pkey); |
| 270 |
|
✗ |
sk_X509_free(certstack); |
| 271 |
|
✗ |
LogCvmfs(kLogAuthz, kLogSyslogErr, |
| 272 |
|
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"Credential file did not contain any actual credentials."); |
| 273 |
|
✗ |
return false; |
| 274 |
|
|
} else { |
| 275 |
|
✗ |
LogCvmfs(kLogAuthz, kLogDebug, "Certificate stack contains %d entries.", |
| 276 |
|
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sk_X509_num(certstack)); |
| 277 |
|
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} |
| 278 |
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|
| 279 |
|
✗ |
AuthzToken *to_return = new AuthzToken(); |
| 280 |
|
✗ |
to_return->type = kTokenX509; |
| 281 |
|
✗ |
to_return->data = static_cast<void *>(parm.release()); |
| 282 |
|
✗ |
curl_easy_setopt(curl_handle, CURLOPT_SSL_CTX_DATA, |
| 283 |
|
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static_cast<sslctx_info *>(to_return->data)); |
| 284 |
|
✗ |
*info_data = to_return; |
| 285 |
|
✗ |
return true; |
| 286 |
|
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} |
| 287 |
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|
|
| 288 |
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|
| 289 |
|
✗ |
void AuthzAttachment::LogOpenSSLErrors(const char *top_message) { |
| 290 |
|
✗ |
assert(ssl_strings_loaded_); |
| 291 |
|
|
char error_buf[1024]; |
| 292 |
|
✗ |
LogCvmfs(kLogAuthz, kLogSyslogWarn, "%s", top_message); |
| 293 |
|
|
unsigned long next_err; // NOLINT; this is the type expected by OpenSSL |
| 294 |
|
✗ |
while ((next_err = ERR_get_error())) { |
| 295 |
|
✗ |
ERR_error_string_n(next_err, error_buf, 1024); |
| 296 |
|
✗ |
LogCvmfs(kLogAuthz, kLogSyslogErr, "%s", error_buf); |
| 297 |
|
|
} |
| 298 |
|
|
} |
| 299 |
|
|
|
| 300 |
|
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|
| 301 |
|
✗ |
void AuthzAttachment::ReleaseCurlHandle(CURL *curl_handle, void *info_data) { |
| 302 |
|
✗ |
assert(info_data); |
| 303 |
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|
|
| 304 |
|
✗ |
AuthzToken *token = static_cast<AuthzToken *>(info_data); |
| 305 |
|
✗ |
if (token->type == kTokenBearer) { |
| 306 |
|
|
// Compiler complains if we delete a void* |
| 307 |
|
✗ |
bearer_info *bearer = static_cast<bearer_info *>(token->data); |
| 308 |
|
✗ |
delete static_cast<char *>(bearer->token); |
| 309 |
|
✗ |
curl_slist_free_all(bearer->list); |
| 310 |
|
✗ |
delete static_cast<bearer_info *>(token->data); |
| 311 |
|
✗ |
token->data = NULL; |
| 312 |
|
✗ |
delete token; |
| 313 |
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|
| 314 |
|
✗ |
} else if (token->type == kTokenX509) { |
| 315 |
|
✗ |
sslctx_info *p = static_cast<sslctx_info *>(token->data); |
| 316 |
|
✗ |
STACK_OF(X509) *chain = p->chain; |
| 317 |
|
✗ |
EVP_PKEY *pkey = p->pkey; |
| 318 |
|
✗ |
p->chain = NULL; |
| 319 |
|
✗ |
p->pkey = NULL; |
| 320 |
|
✗ |
delete p; |
| 321 |
|
|
|
| 322 |
|
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// Calls X509_free on each element, then frees the stack itself |
| 323 |
|
✗ |
sk_X509_pop_free(chain, X509_free); |
| 324 |
|
✗ |
EVP_PKEY_free(pkey); |
| 325 |
|
|
|
| 326 |
|
|
// Make sure that if CVMFS reuses this curl handle, curl doesn't try |
| 327 |
|
|
// to reuse cert chain we just freed. |
| 328 |
|
✗ |
curl_easy_setopt(curl_handle, CURLOPT_SSL_CTX_DATA, 0); |
| 329 |
|
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} |
| 330 |
|
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} |
| 331 |
|
|
|