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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 <fcntl.h> |
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#include <unistd.h> |
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#include <cassert> |
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#include <memory> |
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#include <string> |
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#include "crypto/hash.h" |
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#include "duplex_curl.h" // IWYU pragma: keep |
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#include "gateway_util.h" |
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#include "json_document.h" |
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#include "publish/except.h" |
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#include "publish/repository.h" |
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#include "ssl.h" |
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#include "util/logging.h" |
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#include "util/posix.h" |
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#include "util/string.h" |
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namespace { |
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struct CurlBuffer { |
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std::string data; |
| 28 |
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}; |
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enum LeaseReply { |
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kLeaseReplySuccess, |
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kLeaseReplyBusy, |
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kLeaseReplyFailure |
| 34 |
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}; |
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const int kUnknownApiVersion = -1; |
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✗ |
int ReadApiVersion(const std::string &token_path) { |
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const int version_fd = open( |
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gateway::SessionTokenApiVersionPath(token_path).c_str(), O_RDONLY); |
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const int token_fd = open(token_path.c_str(), O_RDONLY); |
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if (version_fd < 0 || token_fd < 0) { |
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if (version_fd >= 0) |
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close(version_fd); |
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if (token_fd >= 0) |
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close(token_fd); |
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return kUnknownApiVersion; |
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} |
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std::string contents; |
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std::string token; |
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const bool success = SafeReadToString(version_fd, &contents) |
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&& SafeReadToString(token_fd, &token); |
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close(version_fd); |
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close(token_fd); |
| 56 |
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| 57 |
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int version; |
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if (!success |
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|| !gateway::ParseSessionTokenApiVersionRecord(contents, token, |
| 60 |
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&version)) { |
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return kUnknownApiVersion; |
| 62 |
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} |
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return version; |
| 64 |
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} |
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static CURL *PrepareCurl(const std::string &method) { |
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const char *user_agent_string = "cvmfs/" CVMFS_VERSION; |
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CURL *h_curl = curl_easy_init(); |
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assert(h_curl != NULL); |
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curl_easy_setopt(h_curl, CURLOPT_NOPROGRESS, 1L); |
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curl_easy_setopt(h_curl, CURLOPT_USERAGENT, user_agent_string); |
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curl_easy_setopt(h_curl, CURLOPT_MAXREDIRS, 50L); |
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curl_easy_setopt(h_curl, CURLOPT_CUSTOMREQUEST, method.c_str()); |
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return h_curl; |
| 78 |
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} |
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static size_t RecvCB(void *buffer, size_t size, size_t nmemb, void *userp) { |
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CurlBuffer *my_buffer = static_cast<CurlBuffer *>(userp); |
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| 83 |
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if (size * nmemb < 1) { |
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return 0; |
| 85 |
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} |
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my_buffer->data = static_cast<char *>(buffer); |
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return my_buffer->data.size(); |
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} |
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static void MakeAcquireRequest(const gateway::GatewayKey &key, |
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const std::string &repo_path, |
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const std::string &repo_service_url, |
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int llvl, |
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CurlBuffer *buffer) { |
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CURLcode ret = static_cast<CURLcode>(0); |
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CURL *h_curl = PrepareCurl("POST"); |
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const std::string payload = "{\"path\" : \"" + repo_path |
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+ "\", \"api_version\" : \"" |
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+ StringifyInt(gateway::APIVersion()) + "\", " |
| 104 |
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+ "\"hostname\" : \"" + GetHostname() + "\"}"; |
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| 106 |
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shash::Any hmac(shash::kSha1); |
| 107 |
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shash::HmacString(key.secret(), payload, &hmac); |
| 108 |
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SslCertificateStore cs; |
| 109 |
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cs.UseSystemCertificatePath(); |
| 110 |
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cs.ApplySslCertificatePath(h_curl); |
| 111 |
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| 112 |
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const std::string header_str = std::string("Authorization: ") + key.id() + " " |
| 113 |
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+ Base64(hmac.ToString(false)); |
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struct curl_slist *auth_header = NULL; |
| 115 |
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auth_header = curl_slist_append(auth_header, header_str.c_str()); |
| 116 |
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curl_easy_setopt(h_curl, CURLOPT_HTTPHEADER, auth_header); |
| 117 |
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| 118 |
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// Make request to acquire lease from repo services |
| 119 |
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curl_easy_setopt(h_curl, CURLOPT_URL, (repo_service_url + "/leases").c_str()); |
| 120 |
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curl_easy_setopt(h_curl, CURLOPT_POSTFIELDSIZE_LARGE, |
| 121 |
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static_cast<curl_off_t>(payload.length())); |
| 122 |
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curl_easy_setopt(h_curl, CURLOPT_POSTFIELDS, payload.c_str()); |
| 123 |
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curl_easy_setopt(h_curl, CURLOPT_WRITEFUNCTION, RecvCB); |
| 124 |
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curl_easy_setopt(h_curl, CURLOPT_WRITEDATA, buffer); |
| 125 |
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| 126 |
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ret = curl_easy_perform(h_curl); |
| 127 |
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curl_easy_cleanup(h_curl); |
| 128 |
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✗ |
if (ret != CURLE_OK) { |
| 129 |
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LogCvmfs(kLogUploadGateway, llvl | kLogStderr, |
| 130 |
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"Make lease acquire request failed: %d. Reply: %s", ret, |
| 131 |
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buffer->data.c_str()); |
| 132 |
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throw publish::EPublish("cannot acquire lease", |
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publish::EPublish::kFailLeaseHttp); |
| 134 |
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} |
| 135 |
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} |
| 136 |
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| 137 |
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// TODO(jblomer): This should eventually also handle the POST request for |
| 138 |
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// committing a transaction |
| 139 |
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static void MakeDropRequest(const gateway::GatewayKey &key, |
| 140 |
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const std::string &session_token, |
| 141 |
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const std::string &repo_service_url, |
| 142 |
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int llvl, |
| 143 |
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CurlBuffer *reply) { |
| 144 |
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CURLcode ret = static_cast<CURLcode>(0); |
| 145 |
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| 146 |
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CURL *h_curl = PrepareCurl("DELETE"); |
| 147 |
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| 148 |
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shash::Any hmac(shash::kSha1); |
| 149 |
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✗ |
shash::HmacString(key.secret(), session_token, &hmac); |
| 150 |
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SslCertificateStore cs; |
| 151 |
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cs.UseSystemCertificatePath(); |
| 152 |
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cs.ApplySslCertificatePath(h_curl); |
| 153 |
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| 154 |
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const std::string header_str = std::string("Authorization: ") + key.id() + " " |
| 155 |
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+ Base64(hmac.ToString(false)); |
| 156 |
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struct curl_slist *auth_header = NULL; |
| 157 |
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auth_header = curl_slist_append(auth_header, header_str.c_str()); |
| 158 |
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curl_easy_setopt(h_curl, CURLOPT_HTTPHEADER, auth_header); |
| 159 |
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| 160 |
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curl_easy_setopt(h_curl, CURLOPT_URL, |
| 161 |
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(repo_service_url + "/leases/" + session_token).c_str()); |
| 162 |
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curl_easy_setopt(h_curl, CURLOPT_POSTFIELDSIZE_LARGE, |
| 163 |
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static_cast<curl_off_t>(0)); |
| 164 |
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curl_easy_setopt(h_curl, CURLOPT_POSTFIELDS, NULL); |
| 165 |
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curl_easy_setopt(h_curl, CURLOPT_WRITEFUNCTION, RecvCB); |
| 166 |
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curl_easy_setopt(h_curl, CURLOPT_WRITEDATA, reply); |
| 167 |
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| 168 |
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ret = curl_easy_perform(h_curl); |
| 169 |
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curl_easy_cleanup(h_curl); |
| 170 |
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if (ret != CURLE_OK) { |
| 171 |
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LogCvmfs(kLogUploadGateway, llvl | kLogStderr, |
| 172 |
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"Make lease drop request failed: %d. Reply: '%s'", ret, |
| 173 |
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reply->data.c_str()); |
| 174 |
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✗ |
throw publish::EPublish("cannot drop lease", |
| 175 |
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publish::EPublish::kFailLeaseHttp); |
| 176 |
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} |
| 177 |
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} |
| 178 |
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| 179 |
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✗ |
static LeaseReply ParseAcquireReply(const CurlBuffer &buffer, |
| 180 |
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std::string *session_token, |
| 181 |
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int *max_api_version, |
| 182 |
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int llvl) { |
| 183 |
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✗ |
if (buffer.data.size() == 0 || session_token == NULL) { |
| 184 |
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return kLeaseReplyFailure; |
| 185 |
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} |
| 186 |
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| 187 |
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const std::unique_ptr<JsonDocument> reply(JsonDocument::Create(buffer.data)); |
| 188 |
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✗ |
if (reply.get() == nullptr || !reply->IsValid()) { |
| 189 |
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✗ |
return kLeaseReplyFailure; |
| 190 |
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} |
| 191 |
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| 192 |
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const JSON *result = JsonDocument::SearchInObject(reply->root(), "status", |
| 193 |
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JSON_STRING); |
| 194 |
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✗ |
if (result != NULL) { |
| 195 |
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const std::string status = result->get<std::string>(); |
| 196 |
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✗ |
if (status == "ok") { |
| 197 |
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LogCvmfs(kLogCvmfs, llvl | kLogStdout, "Gateway reply: ok"); |
| 198 |
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const JSON *token = JsonDocument::SearchInObject( |
| 199 |
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reply->root(), "session_token", JSON_STRING); |
| 200 |
|
✗ |
if (token != NULL) { |
| 201 |
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LogCvmfs(kLogCvmfs, kLogDebug, "Session token: %s", |
| 202 |
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✗ |
token->get<std::string>().c_str()); |
| 203 |
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✗ |
*session_token = token->get<std::string>(); |
| 204 |
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// Older gateways (API < 3) do not return max_api_version; a missing |
| 205 |
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// field leaves the negotiated version at its default of 0. |
| 206 |
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✗ |
const JSON *api_version = JsonDocument::SearchInObject( |
| 207 |
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reply->root(), "max_api_version", JSON_INT); |
| 208 |
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✗ |
if (api_version != NULL && max_api_version != NULL) { |
| 209 |
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✗ |
*max_api_version = api_version->get<int>(); |
| 210 |
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} |
| 211 |
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✗ |
return kLeaseReplySuccess; |
| 212 |
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} |
| 213 |
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✗ |
} else if (status == "path_busy") { |
| 214 |
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✗ |
const JSON *time_remaining = JsonDocument::SearchInObject( |
| 215 |
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reply->root(), "time_remaining", JSON_STRING); |
| 216 |
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✗ |
LogCvmfs(kLogCvmfs, llvl | kLogStdout, "Path busy. Time remaining = %s", |
| 217 |
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(time_remaining != NULL) |
| 218 |
|
✗ |
? time_remaining->get<std::string>().c_str() |
| 219 |
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: "UNKNOWN"); |
| 220 |
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✗ |
return kLeaseReplyBusy; |
| 221 |
|
✗ |
} else if (status == "error") { |
| 222 |
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✗ |
const JSON *reason = JsonDocument::SearchInObject(reply->root(), "reason", |
| 223 |
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JSON_STRING); |
| 224 |
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✗ |
LogCvmfs(kLogCvmfs, llvl | kLogStdout, "Error: '%s'", |
| 225 |
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✗ |
(reason != NULL) ? reason->get<std::string>().c_str() : ""); |
| 226 |
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} else { |
| 227 |
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✗ |
LogCvmfs(kLogCvmfs, llvl | kLogStdout, "Unknown reply. Status: %s", |
| 228 |
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status.c_str()); |
| 229 |
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} |
| 230 |
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} |
| 231 |
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| 232 |
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✗ |
return kLeaseReplyFailure; |
| 233 |
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} |
| 234 |
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| 235 |
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| 236 |
|
✗ |
static LeaseReply ParseDropReply(const CurlBuffer &buffer, int llvl) { |
| 237 |
|
✗ |
if (buffer.data.size() == 0) { |
| 238 |
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✗ |
return kLeaseReplyFailure; |
| 239 |
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} |
| 240 |
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|
| 241 |
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const std::unique_ptr<const JsonDocument> reply( |
| 242 |
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✗ |
JsonDocument::Create(buffer.data)); |
| 243 |
|
✗ |
if (reply.get() == nullptr || !reply->IsValid()) { |
| 244 |
|
✗ |
return kLeaseReplyFailure; |
| 245 |
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} |
| 246 |
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|
| 247 |
|
✗ |
const JSON *result = JsonDocument::SearchInObject(reply->root(), "status", |
| 248 |
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JSON_STRING); |
| 249 |
|
✗ |
if (result != NULL) { |
| 250 |
|
✗ |
const std::string status = result->get<std::string>(); |
| 251 |
|
✗ |
if (status == "ok") { |
| 252 |
|
✗ |
LogCvmfs(kLogCvmfs, llvl | kLogStdout, "Gateway reply: ok"); |
| 253 |
|
✗ |
return kLeaseReplySuccess; |
| 254 |
|
✗ |
} else if (status == "invalid_token") { |
| 255 |
|
✗ |
LogCvmfs(kLogCvmfs, llvl | kLogStdout, "Error: invalid session token"); |
| 256 |
|
✗ |
} else if (status == "error") { |
| 257 |
|
✗ |
const JSON *reason = JsonDocument::SearchInObject(reply->root(), "reason", |
| 258 |
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JSON_STRING); |
| 259 |
|
✗ |
LogCvmfs(kLogCvmfs, llvl | kLogStdout, "Error from gateway: '%s'", |
| 260 |
|
✗ |
(reason != NULL) ? reason->get<std::string>().c_str() : ""); |
| 261 |
|
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} else { |
| 262 |
|
✗ |
LogCvmfs(kLogCvmfs, llvl | kLogStdout, "Unknown reply. Status: %s", |
| 263 |
|
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status.c_str()); |
| 264 |
|
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} |
| 265 |
|
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} |
| 266 |
|
|
|
| 267 |
|
✗ |
return kLeaseReplyFailure; |
| 268 |
|
|
} |
| 269 |
|
|
|
| 270 |
|
|
} // anonymous namespace |
| 271 |
|
|
|
| 272 |
|
|
namespace publish { |
| 273 |
|
|
|
| 274 |
|
✗ |
Publisher::Session::Session(const Settings &settings_session) |
| 275 |
|
✗ |
: settings_(settings_session) |
| 276 |
|
✗ |
, keep_alive_(false) |
| 277 |
|
|
// TODO(jblomer): it would be better to actually read & validate the token |
| 278 |
|
✗ |
, has_lease_(FileExists(settings_.token_path)) |
| 279 |
|
✗ |
, negotiated_api_version_(has_lease_ ? ReadApiVersion(settings_.token_path) |
| 280 |
|
✗ |
: kUnknownApiVersion) { } |
| 281 |
|
|
|
| 282 |
|
|
|
| 283 |
|
✗ |
Publisher::Session::Session(const SettingsPublisher &settings_publisher, |
| 284 |
|
✗ |
int llvl) { |
| 285 |
|
✗ |
keep_alive_ = false; |
| 286 |
|
✗ |
negotiated_api_version_ = kUnknownApiVersion; |
| 287 |
|
✗ |
if (settings_publisher.storage().type() |
| 288 |
|
✗ |
!= upload::SpoolerDefinition::Gateway) { |
| 289 |
|
✗ |
has_lease_ = true; |
| 290 |
|
✗ |
return; |
| 291 |
|
|
} |
| 292 |
|
|
|
| 293 |
|
✗ |
settings_.service_endpoint = settings_publisher.storage().endpoint(); |
| 294 |
|
✗ |
settings_.repo_path = settings_publisher.fqrn() + "/" |
| 295 |
|
✗ |
+ settings_publisher.transaction().lease_path(); |
| 296 |
|
✗ |
settings_.gw_key_path = settings_publisher.keychain().gw_key_path(); |
| 297 |
|
✗ |
settings_.token_path = settings_publisher.transaction() |
| 298 |
|
✗ |
.spool_area() |
| 299 |
|
✗ |
.gw_session_token(); |
| 300 |
|
✗ |
settings_.llvl = llvl; |
| 301 |
|
|
|
| 302 |
|
|
// TODO(jblomer): it would be better to actually read & validate the token |
| 303 |
|
✗ |
has_lease_ = FileExists(settings_.token_path); |
| 304 |
|
✗ |
negotiated_api_version_ = has_lease_ ? ReadApiVersion(settings_.token_path) |
| 305 |
|
|
: kUnknownApiVersion; |
| 306 |
|
|
// If a lease is already present, we don't want to remove it automatically |
| 307 |
|
✗ |
keep_alive_ = has_lease_; |
| 308 |
|
|
} |
| 309 |
|
|
|
| 310 |
|
|
|
| 311 |
|
✗ |
void Publisher::Session::SetKeepAlive(bool value) { keep_alive_ = value; } |
| 312 |
|
|
|
| 313 |
|
|
|
| 314 |
|
✗ |
void Publisher::Session::Acquire() { |
| 315 |
|
✗ |
if (has_lease_) |
| 316 |
|
✗ |
return; |
| 317 |
|
|
|
| 318 |
|
|
const gateway::GatewayKey gw_key = gateway::ReadGatewayKey( |
| 319 |
|
✗ |
settings_.gw_key_path); |
| 320 |
|
✗ |
if (!gw_key.IsValid()) { |
| 321 |
|
✗ |
throw EPublish("cannot read gateway key: " + settings_.gw_key_path, |
| 322 |
|
✗ |
EPublish::kFailGatewayKey); |
| 323 |
|
|
} |
| 324 |
|
✗ |
CurlBuffer buffer; |
| 325 |
|
✗ |
MakeAcquireRequest(gw_key, settings_.repo_path, settings_.service_endpoint, |
| 326 |
|
|
settings_.llvl, &buffer); |
| 327 |
|
|
|
| 328 |
|
✗ |
std::string session_token; |
| 329 |
|
✗ |
int negotiated_api_version = 0; |
| 330 |
|
✗ |
const LeaseReply rep = ParseAcquireReply( |
| 331 |
|
|
buffer, &session_token, &negotiated_api_version, settings_.llvl); |
| 332 |
|
✗ |
switch (rep) { |
| 333 |
|
✗ |
case kLeaseReplySuccess: { |
| 334 |
|
✗ |
if (!SafeWriteToFile(session_token, settings_.token_path, 0600)) { |
| 335 |
|
✗ |
throw EPublish("cannot write session token: " + settings_.token_path); |
| 336 |
|
|
} |
| 337 |
|
|
// Bind the version record to this token. A stale sidecar is unknown, not |
| 338 |
|
|
// evidence that a newly acquired lease supports this API. |
| 339 |
|
✗ |
has_lease_ = true; |
| 340 |
|
|
const std::string api_version_path = gateway::SessionTokenApiVersionPath( |
| 341 |
|
✗ |
settings_.token_path); |
| 342 |
|
✗ |
if (!SafeWriteToFile(gateway::MakeSessionTokenApiVersionRecord( |
| 343 |
|
|
negotiated_api_version, session_token), |
| 344 |
|
|
api_version_path, 0600)) { |
| 345 |
|
✗ |
throw EPublish("cannot write negotiated gateway API version: " |
| 346 |
|
✗ |
+ api_version_path); |
| 347 |
|
|
} |
| 348 |
|
✗ |
negotiated_api_version_ = negotiated_api_version; |
| 349 |
|
✗ |
} break; |
| 350 |
|
✗ |
case kLeaseReplyBusy: |
| 351 |
|
✗ |
throw EPublish("lease path busy", EPublish::kFailLeaseBusy); |
| 352 |
|
|
break; |
| 353 |
|
✗ |
case kLeaseReplyFailure: |
| 354 |
|
|
default: |
| 355 |
|
✗ |
throw EPublish("cannot parse session token", EPublish::kFailLeaseBody); |
| 356 |
|
|
} |
| 357 |
|
|
} |
| 358 |
|
|
|
| 359 |
|
✗ |
void Publisher::Session::Drop() { |
| 360 |
|
✗ |
if (!has_lease_) |
| 361 |
|
✗ |
return; |
| 362 |
|
|
// TODO(jblomer): there might be a better way to distinguish between the |
| 363 |
|
|
// nop-session and a real session |
| 364 |
|
✗ |
if (settings_.service_endpoint.empty()) |
| 365 |
|
✗ |
return; |
| 366 |
|
|
|
| 367 |
|
✗ |
std::string token; |
| 368 |
|
✗ |
const int fd_token = open(settings_.token_path.c_str(), O_RDONLY); |
| 369 |
|
✗ |
const bool rvb = SafeReadToString(fd_token, &token); |
| 370 |
|
✗ |
close(fd_token); |
| 371 |
|
✗ |
if (!rvb) { |
| 372 |
|
✗ |
throw EPublish("cannot read session token: " + settings_.token_path, |
| 373 |
|
✗ |
EPublish::kFailGatewayKey); |
| 374 |
|
|
} |
| 375 |
|
|
const gateway::GatewayKey gw_key = gateway::ReadGatewayKey( |
| 376 |
|
✗ |
settings_.gw_key_path); |
| 377 |
|
✗ |
if (!gw_key.IsValid()) { |
| 378 |
|
✗ |
throw EPublish("cannot read gateway key: " + settings_.gw_key_path, |
| 379 |
|
✗ |
EPublish::kFailGatewayKey); |
| 380 |
|
|
} |
| 381 |
|
|
|
| 382 |
|
✗ |
CurlBuffer buffer; |
| 383 |
|
✗ |
MakeDropRequest(gw_key, token, settings_.service_endpoint, settings_.llvl, |
| 384 |
|
|
&buffer); |
| 385 |
|
✗ |
const LeaseReply rep = ParseDropReply(buffer, settings_.llvl); |
| 386 |
|
✗ |
int rvi = 0; |
| 387 |
|
✗ |
switch (rep) { |
| 388 |
|
✗ |
case kLeaseReplySuccess: |
| 389 |
|
✗ |
has_lease_ = false; |
| 390 |
|
✗ |
rvi = unlink(settings_.token_path.c_str()); |
| 391 |
|
✗ |
if (rvi != 0) |
| 392 |
|
✗ |
throw EPublish("cannot delete session token " + settings_.token_path); |
| 393 |
|
✗ |
unlink(gateway::SessionTokenApiVersionPath(settings_.token_path).c_str()); |
| 394 |
|
✗ |
negotiated_api_version_ = kUnknownApiVersion; |
| 395 |
|
✗ |
break; |
| 396 |
|
✗ |
case kLeaseReplyFailure: |
| 397 |
|
|
default: |
| 398 |
|
✗ |
throw EPublish("gateway doesn't recognize the lease or cannot drop it", |
| 399 |
|
✗ |
EPublish::kFailLeaseBody); |
| 400 |
|
|
} |
| 401 |
|
|
} |
| 402 |
|
|
|
| 403 |
|
✗ |
Publisher::Session::~Session() { |
| 404 |
|
✗ |
if (keep_alive_) |
| 405 |
|
✗ |
return; |
| 406 |
|
|
|
| 407 |
|
✗ |
Drop(); |
| 408 |
|
|
} |
| 409 |
|
|
|
| 410 |
|
|
} // namespace publish |
| 411 |
|
|
|