--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include <array>
+
+#include <boost/utility/string_view.hpp>
+#include <boost/container/static_vector.hpp>
+#include <boost/algorithm/string/predicate.hpp>
+#include <boost/algorithm/string.hpp>
+
+#include "rgw_swift_auth.h"
+#include "rgw_rest.h"
+
+#include "common/ceph_crypto.h"
+#include "common/Clock.h"
+
+#include "auth/Crypto.h"
+
+#include "rgw_client_io.h"
+#include "rgw_http_client.h"
+#include "include/str_list.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rgw
+
+#define DEFAULT_SWIFT_PREFIX "/swift"
+
+using namespace ceph::crypto;
+
+
+namespace rgw {
+namespace auth {
+namespace swift {
+
+/* TempURL: applier */
+void TempURLApplier::modify_request_state(req_state* s) const /* in/out */
+{
+ bool inline_exists = false;
+ const std::string& filename = s->info.args.get("filename");
+
+ s->info.args.get("inline", &inline_exists);
+ if (inline_exists) {
+ s->content_disp.override = "inline";
+ } else if (!filename.empty()) {
+ std::string fenc;
+ url_encode(filename, fenc);
+ s->content_disp.override = "attachment; filename=\"" + fenc + "\"";
+ } else {
+ std::string fenc;
+ url_encode(s->object.name, fenc);
+ s->content_disp.fallback = "attachment; filename=\"" + fenc + "\"";
+ }
+
+ ldout(s->cct, 20) << "finished applying changes to req_state for TempURL: "
+ << " content_disp override " << s->content_disp.override
+ << " content_disp fallback " << s->content_disp.fallback
+ << dendl;
+
+}
+
+/* TempURL: engine */
+bool TempURLEngine::is_applicable(const req_state* const s) const noexcept
+{
+ return s->info.args.exists("temp_url_sig") ||
+ s->info.args.exists("temp_url_expires");
+}
+
+void TempURLEngine::get_owner_info(const req_state* const s,
+ RGWUserInfo& owner_info) const
+{
+ /* We cannot use req_state::bucket_name because it isn't available
+ * now. It will be initialized in RGWHandler_REST_SWIFT::postauth_init(). */
+ const string& bucket_name = s->init_state.url_bucket;
+
+ /* TempURL requires that bucket and object names are specified. */
+ if (bucket_name.empty() || s->object.empty()) {
+ throw -EPERM;
+ }
+
+ /* TempURL case is completely different than the Keystone auth - you may
+ * get account name only through extraction from URL. In turn, knowledge
+ * about account is neccessary to obtain its bucket tenant. Without that,
+ * the access would be limited to accounts with empty tenant. */
+ string bucket_tenant;
+ if (!s->account_name.empty()) {
+ RGWUserInfo uinfo;
+ bool found = false;
+
+ const rgw_user uid(s->account_name);
+ if (uid.tenant.empty()) {
+ const rgw_user tenanted_uid(uid.id, uid.id);
+
+ if (rgw_get_user_info_by_uid(store, tenanted_uid, uinfo) >= 0) {
+ /* Succeeded. */
+ bucket_tenant = uinfo.user_id.tenant;
+ found = true;
+ }
+ }
+
+ if (!found && rgw_get_user_info_by_uid(store, uid, uinfo) < 0) {
+ throw -EPERM;
+ } else {
+ bucket_tenant = uinfo.user_id.tenant;
+ }
+ }
+
+ /* Need to get user info of bucket owner. */
+ RGWBucketInfo bucket_info;
+ int ret = store->get_bucket_info(*static_cast<RGWObjectCtx *>(s->obj_ctx),
+ bucket_tenant, bucket_name,
+ bucket_info, nullptr);
+ if (ret < 0) {
+ throw ret;
+ }
+
+ ldout(cct, 20) << "temp url user (bucket owner): " << bucket_info.owner
+ << dendl;
+
+ if (rgw_get_user_info_by_uid(store, bucket_info.owner, owner_info) < 0) {
+ throw -EPERM;
+ }
+}
+
+bool TempURLEngine::is_expired(const std::string& expires) const
+{
+ string err;
+ const utime_t now = ceph_clock_now();
+ const uint64_t expiration = (uint64_t)strict_strtoll(expires.c_str(),
+ 10, &err);
+ if (!err.empty()) {
+ dout(5) << "failed to parse temp_url_expires: " << err << dendl;
+ return true;
+ }
+
+ if (expiration <= (uint64_t)now.sec()) {
+ dout(5) << "temp url expired: " << expiration << " <= " << now.sec() << dendl;
+ return true;
+ }
+
+ return false;
+}
+
+std::string extract_swift_subuser(const std::string& swift_user_name) {
+ size_t pos = swift_user_name.find(':');
+ if (std::string::npos == pos) {
+ return swift_user_name;
+ } else {
+ return swift_user_name.substr(pos + 1);
+ }
+}
+
+class TempURLEngine::SignatureHelper
+{
+private:
+ static constexpr uint32_t output_size =
+ CEPH_CRYPTO_HMACSHA1_DIGESTSIZE * 2 + 1;
+
+ unsigned char dest[CEPH_CRYPTO_HMACSHA1_DIGESTSIZE]; // 20
+ char dest_str[output_size];
+
+public:
+ SignatureHelper() = default;
+
+ const char* calc(const std::string& key,
+ const boost::string_view& method,
+ const boost::string_view& path,
+ const std::string& expires) {
+
+ using ceph::crypto::HMACSHA1;
+ using UCHARPTR = const unsigned char*;
+
+ HMACSHA1 hmac((UCHARPTR) key.c_str(), key.size());
+ hmac.Update((UCHARPTR) method.data(), method.size());
+ hmac.Update((UCHARPTR) "\n", 1);
+ hmac.Update((UCHARPTR) expires.c_str(), expires.size());
+ hmac.Update((UCHARPTR) "\n", 1);
+ hmac.Update((UCHARPTR) path.data(), path.size());
+ hmac.Final(dest);
+
+ buf_to_hex((UCHARPTR) dest, sizeof(dest), dest_str);
+
+ return dest_str;
+ }
+
+ bool is_equal_to(const std::string& rhs) const {
+ /* never allow out-of-range exception */
+ if (rhs.size() < (output_size - 1)) {
+ return false;
+ }
+ return rhs.compare(0 /* pos */, output_size, dest_str) == 0;
+ }
+
+}; /* TempURLEngine::SignatureHelper */
+
+class TempURLEngine::PrefixableSignatureHelper
+ : private TempURLEngine::SignatureHelper {
+ using base_t = SignatureHelper;
+
+ const boost::string_view decoded_uri;
+ const boost::string_view object_name;
+ boost::string_view no_obj_uri;
+
+ const boost::optional<const std::string&> prefix;
+
+public:
+ PrefixableSignatureHelper(const std::string& _decoded_uri,
+ const std::string& object_name,
+ const boost::optional<const std::string&> prefix)
+ : decoded_uri(_decoded_uri),
+ object_name(object_name),
+ prefix(prefix) {
+ /* Transform: v1/acct/cont/obj - > v1/acct/cont/
+ *
+ * NOTE(rzarzynski): we really want to substr() on boost::string_view,
+ * not std::string. Otherwise we would end with no_obj_uri referencing
+ * a temporary. */
+ no_obj_uri = \
+ decoded_uri.substr(0, decoded_uri.length() - object_name.length());
+ }
+
+ const char* calc(const std::string& key,
+ const boost::string_view& method,
+ const boost::string_view& path,
+ const std::string& expires) {
+ if (!prefix) {
+ return base_t::calc(key, method, path, expires);
+ } else {
+ const auto prefixed_path = \
+ string_cat_reserve("prefix:", no_obj_uri, *prefix);
+ return base_t::calc(key, method, prefixed_path, expires);
+ }
+ }
+
+ bool is_equal_to(const std::string& rhs) const {
+ bool is_auth_ok = base_t::is_equal_to(rhs);
+
+ if (prefix && is_auth_ok) {
+ const auto prefix_uri = string_cat_reserve(no_obj_uri, *prefix);
+ is_auth_ok = boost::algorithm::starts_with(decoded_uri, prefix_uri);
+ }
+
+ return is_auth_ok;
+ }
+}; /* TempURLEngine::PrefixableSignatureHelper */
+
+TempURLEngine::result_t
+TempURLEngine::authenticate(const req_state* const s) const
+{
+ if (! is_applicable(s)) {
+ return result_t::deny();
+ }
+
+ /* NOTE(rzarzynski): RGWHTTPArgs::get(), in contrast to RGWEnv::get(),
+ * never returns nullptr. If the requested parameter is absent, we will
+ * get the empty string. */
+ const std::string& temp_url_sig = s->info.args.get("temp_url_sig");
+ const std::string& temp_url_expires = s->info.args.get("temp_url_expires");
+
+ if (temp_url_sig.empty() || temp_url_expires.empty()) {
+ return result_t::deny();
+ }
+
+ /* Though, for prefixed tempurls we need to differentiate between empty
+ * prefix and lack of prefix. Empty prefix means allowance for whole
+ * container. */
+ const boost::optional<const std::string&> temp_url_prefix = \
+ s->info.args.get_optional("temp_url_prefix");
+
+ RGWUserInfo owner_info;
+ try {
+ get_owner_info(s, owner_info);
+ } catch (...) {
+ ldout(cct, 5) << "cannot get user_info of account's owner" << dendl;
+ return result_t::reject();
+ }
+
+ if (owner_info.temp_url_keys.empty()) {
+ ldout(cct, 5) << "user does not have temp url key set, aborting" << dendl;
+ return result_t::reject();
+ }
+
+ if (is_expired(temp_url_expires)) {
+ ldout(cct, 5) << "temp url link expired" << dendl;
+ return result_t::reject(-EPERM);
+ }
+
+ /* We need to verify two paths because of compliance with Swift, Tempest
+ * and old versions of RadosGW. The second item will have the prefix
+ * of Swift API entry point removed. */
+
+ /* XXX can we search this ONCE? */
+ const size_t pos = g_conf->rgw_swift_url_prefix.find_last_not_of('/') + 1;
+ const boost::string_view ref_uri = s->decoded_uri;
+ const std::array<boost::string_view, 2> allowed_paths = {
+ ref_uri,
+ ref_uri.substr(pos + 1)
+ };
+
+ /* Account owner calculates the signature also against a HTTP method. */
+ boost::container::static_vector<boost::string_view, 3> allowed_methods;
+ if (strcmp("HEAD", s->info.method) == 0) {
+ /* HEAD requests are specially handled. */
+ /* TODO: after getting a newer boost (with static_vector supporting
+ * initializers lists), get back to the good notation:
+ * allowed_methods = {"HEAD", "GET", "PUT" };
+ * Just for now let's use emplace_back to construct the vector. */
+ allowed_methods.emplace_back("HEAD");
+ allowed_methods.emplace_back("GET");
+ allowed_methods.emplace_back("PUT");
+ } else if (strlen(s->info.method) > 0) {
+ allowed_methods.emplace_back(s->info.method);
+ }
+
+ /* Need to try each combination of keys, allowed path and methods. */
+ PrefixableSignatureHelper sig_helper {
+ s->decoded_uri,
+ s->object.name,
+ temp_url_prefix
+ };
+
+ for (const auto& kv : owner_info.temp_url_keys) {
+ const int temp_url_key_num = kv.first;
+ const string& temp_url_key = kv.second;
+
+ if (temp_url_key.empty()) {
+ continue;
+ }
+
+ for (const auto& path : allowed_paths) {
+ for (const auto& method : allowed_methods) {
+ const char* const local_sig = sig_helper.calc(temp_url_key, method,
+ path, temp_url_expires);
+
+ ldout(s->cct, 20) << "temp url signature [" << temp_url_key_num
+ << "] (calculated): " << local_sig
+ << dendl;
+
+ if (sig_helper.is_equal_to(temp_url_sig)) {
+ auto apl = apl_factory->create_apl_turl(cct, s, owner_info);
+ return result_t::grant(std::move(apl));
+ } else {
+ ldout(s->cct, 5) << "temp url signature mismatch: " << local_sig
+ << " != " << temp_url_sig << dendl;
+ }
+ }
+ }
+ }
+
+ return result_t::reject();
+}
+
+
+/* External token */
+bool ExternalTokenEngine::is_applicable(const std::string& token) const noexcept
+{
+ if (token.empty()) {
+ return false;
+ } else if (g_conf->rgw_swift_auth_url.empty()) {
+ return false;
+ } else {
+ return true;
+ }
+}
+
+ExternalTokenEngine::result_t
+ExternalTokenEngine::authenticate(const std::string& token,
+ const req_state* const s) const
+{
+ if (! is_applicable(token)) {
+ return result_t::deny();
+ }
+
+ std::string auth_url = g_conf->rgw_swift_auth_url;
+ if (auth_url.back() != '/') {
+ auth_url.append("/");
+ }
+
+ auth_url.append("token");
+ char url_buf[auth_url.size() + 1 + token.length() + 1];
+ sprintf(url_buf, "%s/%s", auth_url.c_str(), token.c_str());
+
+ RGWHTTPHeadersCollector validator(cct, { "X-Auth-Groups", "X-Auth-Ttl" });
+
+ ldout(cct, 10) << "rgw_swift_validate_token url=" << url_buf << dendl;
+
+ int ret = validator.process(url_buf);
+ if (ret < 0) {
+ throw ret;
+ }
+
+ std::string swift_user;
+ try {
+ std::vector<std::string> swift_groups;
+ get_str_vec(validator.get_header_value("X-Auth-Groups"),
+ ",", swift_groups);
+
+ if (0 == swift_groups.size()) {
+ return result_t::deny(-EPERM);
+ } else {
+ swift_user = std::move(swift_groups[0]);
+ }
+ } catch (std::out_of_range) {
+ /* The X-Auth-Groups header isn't present in the response. */
+ return result_t::deny(-EPERM);
+ }
+
+ if (swift_user.empty()) {
+ return result_t::deny(-EPERM);
+ }
+
+ ldout(cct, 10) << "swift user=" << swift_user << dendl;
+
+ RGWUserInfo tmp_uinfo;
+ ret = rgw_get_user_info_by_swift(store, swift_user, tmp_uinfo);
+ if (ret < 0) {
+ ldout(cct, 0) << "NOTICE: couldn't map swift user" << dendl;
+ throw ret;
+ }
+
+ auto apl = apl_factory->create_apl_local(cct, s, tmp_uinfo,
+ extract_swift_subuser(swift_user));
+ return result_t::grant(std::move(apl));
+}
+
+static int build_token(const string& swift_user,
+ const string& key,
+ const uint64_t nonce,
+ const utime_t& expiration,
+ bufferlist& bl)
+{
+ ::encode(swift_user, bl);
+ ::encode(nonce, bl);
+ ::encode(expiration, bl);
+
+ bufferptr p(CEPH_CRYPTO_HMACSHA1_DIGESTSIZE);
+
+ char buf[bl.length() * 2 + 1];
+ buf_to_hex((const unsigned char *)bl.c_str(), bl.length(), buf);
+ dout(20) << "build_token token=" << buf << dendl;
+
+ char k[CEPH_CRYPTO_HMACSHA1_DIGESTSIZE];
+ memset(k, 0, sizeof(k));
+ const char *s = key.c_str();
+ for (int i = 0; i < (int)key.length(); i++, s++) {
+ k[i % CEPH_CRYPTO_HMACSHA1_DIGESTSIZE] |= *s;
+ }
+ calc_hmac_sha1(k, sizeof(k), bl.c_str(), bl.length(), p.c_str());
+
+ bl.append(p);
+
+ return 0;
+
+}
+
+static int encode_token(CephContext *cct, string& swift_user, string& key,
+ bufferlist& bl)
+{
+ uint64_t nonce;
+
+ int ret = get_random_bytes((char *)&nonce, sizeof(nonce));
+ if (ret < 0)
+ return ret;
+
+ utime_t expiration = ceph_clock_now();
+ expiration += cct->_conf->rgw_swift_token_expiration;
+
+ return build_token(swift_user, key, nonce, expiration, bl);
+}
+
+
+/* AUTH_rgwtk (signed token): engine */
+bool SignedTokenEngine::is_applicable(const std::string& token) const noexcept
+{
+ if (token.empty()) {
+ return false;
+ } else {
+ return token.compare(0, 10, "AUTH_rgwtk") == 0;
+ }
+}
+
+SignedTokenEngine::result_t
+SignedTokenEngine::authenticate(const std::string& token,
+ const req_state* const s) const
+{
+ if (! is_applicable(token)) {
+ return result_t::deny(-EPERM);
+ }
+
+ /* Effective token string is the part after the prefix. */
+ const std::string etoken = token.substr(strlen("AUTH_rgwtk"));
+ const size_t etoken_len = etoken.length();
+
+ if (etoken_len & 1) {
+ ldout(cct, 0) << "NOTICE: failed to verify token: odd token length="
+ << etoken_len << dendl;
+ throw -EINVAL;
+ }
+
+ ceph::bufferptr p(etoken_len/2);
+ int ret = hex_to_buf(etoken.c_str(), p.c_str(), etoken_len);
+ if (ret < 0) {
+ throw ret;
+ }
+
+ ceph::bufferlist tok_bl;
+ tok_bl.append(p);
+
+ uint64_t nonce;
+ utime_t expiration;
+ std::string swift_user;
+
+ try {
+ /*const*/ auto iter = tok_bl.begin();
+
+ ::decode(swift_user, iter);
+ ::decode(nonce, iter);
+ ::decode(expiration, iter);
+ } catch (buffer::error& err) {
+ ldout(cct, 0) << "NOTICE: failed to decode token" << dendl;
+ throw -EINVAL;
+ }
+
+ const utime_t now = ceph_clock_now();
+ if (expiration < now) {
+ ldout(cct, 0) << "NOTICE: old timed out token was used now=" << now
+ << " token.expiration=" << expiration
+ << dendl;
+ return result_t::deny(-EPERM);
+ }
+
+ RGWUserInfo user_info;
+ ret = rgw_get_user_info_by_swift(store, swift_user, user_info);
+ if (ret < 0) {
+ throw ret;
+ }
+
+ ldout(cct, 10) << "swift_user=" << swift_user << dendl;
+
+ const auto siter = user_info.swift_keys.find(swift_user);
+ if (siter == std::end(user_info.swift_keys)) {
+ return result_t::deny(-EPERM);
+ }
+
+ const auto swift_key = siter->second;
+
+ bufferlist local_tok_bl;
+ ret = build_token(swift_user, swift_key.key, nonce, expiration, local_tok_bl);
+ if (ret < 0) {
+ throw ret;
+ }
+
+ if (local_tok_bl.length() != tok_bl.length()) {
+ ldout(cct, 0) << "NOTICE: tokens length mismatch:"
+ << " tok_bl.length()=" << tok_bl.length()
+ << " local_tok_bl.length()=" << local_tok_bl.length()
+ << dendl;
+ return result_t::deny(-EPERM);
+ }
+
+ if (memcmp(local_tok_bl.c_str(), tok_bl.c_str(),
+ local_tok_bl.length()) != 0) {
+ char buf[local_tok_bl.length() * 2 + 1];
+
+ buf_to_hex(reinterpret_cast<const unsigned char *>(local_tok_bl.c_str()),
+ local_tok_bl.length(), buf);
+
+ ldout(cct, 0) << "NOTICE: tokens mismatch tok=" << buf << dendl;
+ return result_t::deny(-EPERM);
+ }
+
+ auto apl = apl_factory->create_apl_local(cct, s, user_info,
+ extract_swift_subuser(swift_user));
+ return result_t::grant(std::move(apl));
+}
+
+} /* namespace swift */
+} /* namespace auth */
+} /* namespace rgw */
+
+
+void RGW_SWIFT_Auth_Get::execute()
+{
+ int ret = -EPERM;
+
+ const char *key = s->info.env->get("HTTP_X_AUTH_KEY");
+ const char *user = s->info.env->get("HTTP_X_AUTH_USER");
+
+ s->prot_flags |= RGW_REST_SWIFT;
+
+ string user_str;
+ RGWUserInfo info;
+ bufferlist bl;
+ RGWAccessKey *swift_key;
+ map<string, RGWAccessKey>::iterator siter;
+
+ string swift_url = g_conf->rgw_swift_url;
+ string swift_prefix = g_conf->rgw_swift_url_prefix;
+ string tenant_path;
+
+ /*
+ * We did not allow an empty Swift prefix before, but we want it now.
+ * So, we take rgw_swift_url_prefix = "/" to yield the empty prefix.
+ * The rgw_swift_url_prefix = "" is the default and yields "/swift"
+ * in a backwards-compatible way.
+ */
+ if (swift_prefix.size() == 0) {
+ swift_prefix = DEFAULT_SWIFT_PREFIX;
+ } else if (swift_prefix == "/") {
+ swift_prefix.clear();
+ } else {
+ if (swift_prefix[0] != '/') {
+ swift_prefix.insert(0, "/");
+ }
+ }
+
+ if (swift_url.size() == 0) {
+ bool add_port = false;
+ const char *server_port = s->info.env->get("SERVER_PORT_SECURE");
+ const char *protocol;
+ if (server_port) {
+ add_port = (strcmp(server_port, "443") != 0);
+ protocol = "https";
+ } else {
+ server_port = s->info.env->get("SERVER_PORT");
+ add_port = (strcmp(server_port, "80") != 0);
+ protocol = "http";
+ }
+ const char *host = s->info.env->get("HTTP_HOST");
+ if (!host) {
+ dout(0) << "NOTICE: server is misconfigured, missing rgw_swift_url_prefix or rgw_swift_url, HTTP_HOST is not set" << dendl;
+ ret = -EINVAL;
+ goto done;
+ }
+ swift_url = protocol;
+ swift_url.append("://");
+ swift_url.append(host);
+ if (add_port && !strchr(host, ':')) {
+ swift_url.append(":");
+ swift_url.append(server_port);
+ }
+ }
+
+ if (!key || !user)
+ goto done;
+
+ user_str = user;
+
+ if ((ret = rgw_get_user_info_by_swift(store, user_str, info)) < 0)
+ {
+ ret = -EACCES;
+ goto done;
+ }
+
+ siter = info.swift_keys.find(user_str);
+ if (siter == info.swift_keys.end()) {
+ ret = -EPERM;
+ goto done;
+ }
+ swift_key = &siter->second;
+
+ if (swift_key->key.compare(key) != 0) {
+ dout(0) << "NOTICE: RGW_SWIFT_Auth_Get::execute(): bad swift key" << dendl;
+ ret = -EPERM;
+ goto done;
+ }
+
+ if (!g_conf->rgw_swift_tenant_name.empty()) {
+ tenant_path = "/AUTH_";
+ tenant_path.append(g_conf->rgw_swift_tenant_name);
+ } else if (g_conf->rgw_swift_account_in_url) {
+ tenant_path = "/AUTH_";
+ tenant_path.append(info.user_id.to_str());
+ }
+
+ dump_header(s, "X-Storage-Url", swift_url + swift_prefix + "/v1" +
+ tenant_path);
+
+ using rgw::auth::swift::encode_token;
+ if ((ret = encode_token(s->cct, swift_key->id, swift_key->key, bl)) < 0)
+ goto done;
+
+ {
+ static constexpr size_t PREFIX_LEN = sizeof("AUTH_rgwtk") - 1;
+ char token_val[PREFIX_LEN + bl.length() * 2 + 1];
+
+ snprintf(token_val, PREFIX_LEN + 1, "AUTH_rgwtk");
+ buf_to_hex((const unsigned char *)bl.c_str(), bl.length(),
+ token_val + PREFIX_LEN);
+
+ dump_header(s, "X-Storage-Token", token_val);
+ dump_header(s, "X-Auth-Token", token_val);
+ }
+
+ ret = STATUS_NO_CONTENT;
+
+done:
+ set_req_state_err(s, ret);
+ dump_errno(s);
+ end_header(s);
+}
+
+int RGWHandler_SWIFT_Auth::init(RGWRados *store, struct req_state *state,
+ rgw::io::BasicClient *cio)
+{
+ state->dialect = "swift-auth";
+ state->formatter = new JSONFormatter;
+ state->format = RGW_FORMAT_JSON;
+
+ return RGWHandler::init(store, state, cio);
+}
+
+int RGWHandler_SWIFT_Auth::authorize()
+{
+ return 0;
+}
+
+RGWOp *RGWHandler_SWIFT_Auth::op_get()
+{
+ return new RGW_SWIFT_Auth_Get;
+}
+
Code Review / stor4nfv.git / blobdiff