diff options
Diffstat (limited to 'src/rgw/rgw_kms.cc')
| -rw-r--r-- | src/rgw/rgw_kms.cc | 984 |
1 files changed, 984 insertions, 0 deletions
diff --git a/src/rgw/rgw_kms.cc b/src/rgw/rgw_kms.cc new file mode 100644 index 000000000..dcdcf8751 --- /dev/null +++ b/src/rgw/rgw_kms.cc @@ -0,0 +1,984 @@ +// -*- mode:C; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +/** + * Server-side encryption integrations with Key Management Systems (SSE-KMS) + */ + +#include <sys/stat.h> +#include "include/str_map.h" +#include "common/safe_io.h" +#include "rgw/rgw_crypt.h" +#include "rgw/rgw_keystone.h" +#include "rgw/rgw_b64.h" +#include "rgw/rgw_kms.h" +#include "rgw/rgw_kmip_client.h" +#include <rapidjson/allocators.h> +#include <rapidjson/document.h> +#include <rapidjson/writer.h> +#include "rapidjson/error/error.h" +#include "rapidjson/error/en.h" + +#define dout_context g_ceph_context +#define dout_subsys ceph_subsys_rgw + +using namespace rgw; + +#ifndef FORTEST_VIRTUAL +#define FORTEST_VIRTUAL /**/ +#endif + +/** + * Memory pool for use with rapidjson. This version + * carefully zeros out all memory before returning it to + * the system. + */ +#define ALIGNTYPE double +#define MINCHUNKSIZE 4096 +class ZeroPoolAllocator { +private: + struct element { + struct element *next; + int size; + char data[4]; + } *b; + size_t left; +public: + static const bool kNeedFree { false }; + ZeroPoolAllocator(){ + b = 0; + left = 0; + } + ~ZeroPoolAllocator(){ + element *p; + while ((p = b)) { + b = p->next; + memset(p->data, 0, p->size); + free(p); + } + } + void * Malloc(size_t size) { + void *r; + if (!size) return 0; + size = (size + sizeof(ALIGNTYPE)-1)&(-sizeof(ALIGNTYPE)); + if (size > left) { + size_t ns { size }; + if (ns < MINCHUNKSIZE) ns = MINCHUNKSIZE; + element *nw { (element *) malloc(sizeof *b + ns) }; + if (!nw) { +// std::cerr << "out of memory" << std::endl; + return 0; + } + left = ns - sizeof *b; + nw->size = ns; + nw->next = b; + b = nw; + } + left -= size; + r = static_cast<void*>(b->data + left); + return r; + } + void* Realloc(void* p, size_t old, size_t nw) { + void *r; + if (nw) r = malloc(nw); + if (nw > old) nw = old; + if (r && old) memcpy(r, p, nw); + return r; + } + static void Free(void *p) { + ceph_assert(0 == "Free should not be called"); + } +private: + //! Copy constructor is not permitted. + ZeroPoolAllocator(const ZeroPoolAllocator& rhs) /* = delete */; + //! Copy assignment operator is not permitted. + ZeroPoolAllocator& operator=(const ZeroPoolAllocator& rhs) /* = delete */; +}; + +typedef rapidjson::GenericDocument<rapidjson::UTF8<>, + ZeroPoolAllocator, + rapidjson::CrtAllocator + > ZeroPoolDocument; +typedef rapidjson::GenericValue<rapidjson::UTF8<>, ZeroPoolAllocator> ZeroPoolValue; + +/** + * Construct a full URL string by concatenating a "base" URL with another path, + * ensuring there is one and only one forward slash between them. If path is + * empty, the URL is not changed. + */ +static void concat_url(std::string &url, std::string path) { + bool url_has_slash = !url.empty() && url.back() == '/'; + if (!path.empty()) { + if (url_has_slash && path.front() == '/') { + url.pop_back(); + } else if (!url_has_slash && path.front() != '/') { + url.push_back('/'); + } + url.append(path); + } +} + +/** + * Determine if a string (url) ends with a given suffix. + * Must deal with (ignore) trailing slashes. + */ +static bool string_ends_maybe_slash(std::string_view hay, + std::string_view needle) +{ + auto hay_len { hay.size() }; + auto needle_len { needle.size() }; + if (hay_len < needle_len) return false; + auto hay_suffix_start { hay.data() + (hay_len - needle_len) }; + while (hay_len > needle_len && hay[hay_len-1] == '/') { + --hay_len; + --hay_suffix_start; + } + std::string_view hay_suffix { hay_suffix_start, needle_len }; + return hay_suffix == needle; +} + +template<typename E, typename A = ZeroPoolAllocator> +static inline void +add_name_val_to_obj(std::string &n, std::string &v, rapidjson::GenericValue<E,A> &d, + A &allocator) +{ + rapidjson::GenericValue<E,A> name, val; + name.SetString(n.c_str(), n.length(), allocator); + val.SetString(v.c_str(), v.length(), allocator); + d.AddMember(name, val, allocator); +} + +template<typename E, typename A = ZeroPoolAllocator> +static inline void +add_name_val_to_obj(const char *n, std::string &v, rapidjson::GenericValue<E,A> &d, + A &allocator) +{ + std::string ns{n, strlen(n) }; + add_name_val_to_obj(ns, v, d, allocator); +} + +typedef std::map<std::string, std::string> EngineParmMap; + +class VaultSecretEngine: public SecretEngine { + +protected: + CephContext *cct; + + int load_token_from_file(std::string *vault_token) + { + + int res = 0; + std::string token_file = cct->_conf->rgw_crypt_vault_token_file; + if (token_file.empty()) { + ldout(cct, 0) << "ERROR: Vault token file not set in rgw_crypt_vault_token_file" << dendl; + return -EINVAL; + } + ldout(cct, 20) << "Vault token file: " << token_file << dendl; + + struct stat token_st; + if (stat(token_file.c_str(), &token_st) != 0) { + ldout(cct, 0) << "ERROR: Vault token file '" << token_file << "' not found " << dendl; + return -ENOENT; + } + + if (token_st.st_mode & (S_IRWXG | S_IRWXO)) { + ldout(cct, 0) << "ERROR: Vault token file '" << token_file << "' permissions are " + << "too open, it must not be accessible by other users" << dendl; + return -EACCES; + } + + char buf[2048]; + res = safe_read_file("", token_file.c_str(), buf, sizeof(buf)); + if (res < 0) { + if (-EACCES == res) { + ldout(cct, 0) << "ERROR: Permission denied reading Vault token file" << dendl; + } else { + ldout(cct, 0) << "ERROR: Failed to read Vault token file with error " << res << dendl; + } + return res; + } + // drop trailing newlines + while (res && isspace(buf[res-1])) { + --res; + } + vault_token->assign(std::string{buf, static_cast<size_t>(res)}); + memset(buf, 0, sizeof(buf)); + ::ceph::crypto::zeroize_for_security(buf, sizeof(buf)); + return res; + } + + FORTEST_VIRTUAL + int send_request(const char *method, std::string_view infix, + std::string_view key_id, + const std::string& postdata, + bufferlist &secret_bl) + { + int res; + string vault_token = ""; + if (RGW_SSE_KMS_VAULT_AUTH_TOKEN == cct->_conf->rgw_crypt_vault_auth){ + ldout(cct, 0) << "Loading Vault Token from filesystem" << dendl; + res = load_token_from_file(&vault_token); + if (res < 0){ + return res; + } + } + + std::string secret_url = cct->_conf->rgw_crypt_vault_addr; + if (secret_url.empty()) { + ldout(cct, 0) << "ERROR: Vault address not set in rgw_crypt_vault_addr" << dendl; + return -EINVAL; + } + + concat_url(secret_url, cct->_conf->rgw_crypt_vault_prefix); + concat_url(secret_url, std::string(infix)); + concat_url(secret_url, std::string(key_id)); + + RGWHTTPTransceiver secret_req(cct, method, secret_url, &secret_bl); + + if (postdata.length()) { + secret_req.set_post_data(postdata); + secret_req.set_send_length(postdata.length()); + } + + secret_req.append_header("X-Vault-Token", vault_token); + if (!vault_token.empty()){ + secret_req.append_header("X-Vault-Token", vault_token); + vault_token.replace(0, vault_token.length(), vault_token.length(), '\000'); + } + + string vault_namespace = cct->_conf->rgw_crypt_vault_namespace; + if (!vault_namespace.empty()){ + ldout(cct, 20) << "Vault Namespace: " << vault_namespace << dendl; + secret_req.append_header("X-Vault-Namespace", vault_namespace); + } + + secret_req.set_verify_ssl(cct->_conf->rgw_crypt_vault_verify_ssl); + + if (!cct->_conf->rgw_crypt_vault_ssl_cacert.empty()) { + secret_req.set_ca_path(cct->_conf->rgw_crypt_vault_ssl_cacert); + } + + if (!cct->_conf->rgw_crypt_vault_ssl_clientcert.empty()) { + secret_req.set_client_cert(cct->_conf->rgw_crypt_vault_ssl_clientcert); + } + if (!cct->_conf->rgw_crypt_vault_ssl_clientkey.empty()) { + secret_req.set_client_key(cct->_conf->rgw_crypt_vault_ssl_clientkey); + } + + res = secret_req.process(null_yield); + if (res < 0) { + ldout(cct, 0) << "ERROR: Request to Vault failed with error " << res << dendl; + return res; + } + + if (secret_req.get_http_status() == + RGWHTTPTransceiver::HTTP_STATUS_UNAUTHORIZED) { + ldout(cct, 0) << "ERROR: Vault request failed authorization" << dendl; + return -EACCES; + } + + ldout(cct, 20) << "Request to Vault returned " << res << " and HTTP status " + << secret_req.get_http_status() << dendl; + + return res; + } + + int send_request(std::string_view key_id, bufferlist &secret_bl) + { + return send_request("GET", "", key_id, string{}, secret_bl); + } + + int decode_secret(std::string encoded, std::string& actual_key){ + try { + actual_key = from_base64(encoded); + } catch (std::exception&) { + ldout(cct, 0) << "ERROR: Failed to base64 decode key retrieved from Vault" << dendl; + return -EINVAL; + } + memset(encoded.data(), 0, encoded.length()); + return 0; + } + +public: + + VaultSecretEngine(CephContext *cct) { + this->cct = cct; + } +}; + +class TransitSecretEngine: public VaultSecretEngine { +public: + int compat; + static const int COMPAT_NEW_ONLY = 0; + static const int COMPAT_OLD_AND_NEW = 1; + static const int COMPAT_ONLY_OLD = 2; + static const int COMPAT_UNSET = -1; + +private: + EngineParmMap parms; + + int get_key_version(std::string_view key_id, string& version) + { + size_t pos = 0; + + pos = key_id.rfind("/"); + if (pos != std::string_view::npos){ + std::string_view token = key_id.substr(pos+1, key_id.length()-pos); + if (!token.empty() && token.find_first_not_of("0123456789") == std::string_view::npos){ + version.assign(std::string(token)); + return 0; + } + } + return -1; + } + +public: + TransitSecretEngine(CephContext *cct, EngineParmMap parms): VaultSecretEngine(cct), parms(parms) { + compat = COMPAT_UNSET; + for (auto& e: parms) { + if (e.first == "compat") { + if (e.second.empty()) { + compat = COMPAT_OLD_AND_NEW; + } else { + size_t ep; + + compat = std::stoi(e.second, &ep); + if (ep != e.second.length()) { + lderr(cct) << "warning: vault transit secrets engine : compat=" + << e.second << " trailing junk? (ignored)" << dendl; + } + } + continue; + } + lderr(cct) << "ERROR: vault transit secrets engine : parameter " + << e.first << "=" << e.second << " ignored" << dendl; + } + if (compat == COMPAT_UNSET) { + std::string_view v { cct->_conf->rgw_crypt_vault_prefix }; + if (string_ends_maybe_slash(v,"/export/encryption-key")) { + compat = COMPAT_ONLY_OLD; + } else { + compat = COMPAT_NEW_ONLY; + } + } + } + + int get_key(std::string_view key_id, std::string& actual_key) + { + ZeroPoolDocument d; + ZeroPoolValue *v; + string version; + bufferlist secret_bl; + + if (get_key_version(key_id, version) < 0){ + ldout(cct, 20) << "Missing or invalid key version" << dendl; + return -EINVAL; + } + + int res = send_request("GET", compat == COMPAT_ONLY_OLD ? "" : "/export/encryption-key", + key_id, string{}, secret_bl); + if (res < 0) { + return res; + } + + ldout(cct, 20) << "Parse response into JSON Object" << dendl; + + secret_bl.append('\0'); + rapidjson::StringStream isw(secret_bl.c_str()); + d.ParseStream<>(isw); + + if (d.HasParseError()) { + ldout(cct, 0) << "ERROR: Failed to parse JSON response from Vault: " + << rapidjson::GetParseError_En(d.GetParseError()) << dendl; + return -EINVAL; + } + secret_bl.zero(); + + const char *elements[] = {"data", "keys", version.c_str()}; + v = &d; + for (auto &elem: elements) { + if (!v->IsObject()) { + v = nullptr; + break; + } + auto endr { v->MemberEnd() }; + auto itr { v->FindMember(elem) }; + if (itr == endr) { + v = nullptr; + break; + } + v = &itr->value; + } + if (!v || !v->IsString()) { + ldout(cct, 0) << "ERROR: Key not found in JSON response from Vault using Transit Engine" << dendl; + return -EINVAL; + } + return decode_secret(v->GetString(), actual_key); + } + + int make_actual_key(map<string, bufferlist>& attrs, std::string& actual_key) + { + std::string key_id = get_str_attribute(attrs, RGW_ATTR_CRYPT_KEYID); + if (compat == COMPAT_ONLY_OLD) return get_key(key_id, actual_key); + if (key_id.find("/") != std::string::npos) { + ldout(cct, 0) << "sorry, can't allow / in keyid" << dendl; + return -EINVAL; + } +/* + data: {context } + post to prefix + /datakey/plaintext/ + key_id + jq: .data.plaintext -> key + jq: .data.ciphertext -> (to-be) named attribute + return decode_secret(json_obj, actual_key) +*/ + std::string context = get_str_attribute(attrs, RGW_ATTR_CRYPT_CONTEXT); + ZeroPoolDocument d { rapidjson::kObjectType }; + auto &allocator { d.GetAllocator() }; + bufferlist secret_bl; + + add_name_val_to_obj("context", context, d, allocator); + rapidjson::StringBuffer buf; + rapidjson::Writer<rapidjson::StringBuffer> writer(buf); + if (!d.Accept(writer)) { + ldout(cct, 0) << "ERROR: can't make json for vault" << dendl; + return -EINVAL; + } + std::string post_data { buf.GetString() }; + + int res = send_request("POST", "/datakey/plaintext/", key_id, + post_data, secret_bl); + if (res < 0) { + return res; + } + + ldout(cct, 20) << "Parse response into JSON Object" << dendl; + + secret_bl.append('\0'); + rapidjson::StringStream isw(secret_bl.c_str()); + d.SetNull(); + d.ParseStream<>(isw); + + if (d.HasParseError()) { + ldout(cct, 0) << "ERROR: Failed to parse JSON response from Vault: " + << rapidjson::GetParseError_En(d.GetParseError()) << dendl; + return -EINVAL; + } + secret_bl.zero(); + + if (!d.IsObject()) { + ldout(cct, 0) << "ERROR: response from Vault is not an object" << dendl; + return -EINVAL; + } + { + auto data_itr { d.FindMember("data") }; + if (data_itr == d.MemberEnd()) { + ldout(cct, 0) << "ERROR: no .data in response from Vault" << dendl; + return -EINVAL; + } + auto ciphertext_itr { data_itr->value.FindMember("ciphertext") }; + auto plaintext_itr { data_itr->value.FindMember("plaintext") }; + if (ciphertext_itr == data_itr->value.MemberEnd()) { + ldout(cct, 0) << "ERROR: no .data.ciphertext in response from Vault" << dendl; + return -EINVAL; + } + if (plaintext_itr == data_itr->value.MemberEnd()) { + ldout(cct, 0) << "ERROR: no .data.plaintext in response from Vault" << dendl; + return -EINVAL; + } + auto &ciphertext_v { ciphertext_itr->value }; + auto &plaintext_v { plaintext_itr->value }; + if (!ciphertext_v.IsString()) { + ldout(cct, 0) << "ERROR: .data.ciphertext not a string in response from Vault" << dendl; + return -EINVAL; + } + if (!plaintext_v.IsString()) { + ldout(cct, 0) << "ERROR: .data.plaintext not a string in response from Vault" << dendl; + return -EINVAL; + } + set_attr(attrs, RGW_ATTR_CRYPT_DATAKEY, ciphertext_v.GetString()); + return decode_secret(plaintext_v.GetString(), actual_key); + } + } + + int reconstitute_actual_key(map<string, bufferlist>& attrs, std::string& actual_key) + { + std::string key_id = get_str_attribute(attrs, RGW_ATTR_CRYPT_KEYID); + std::string wrapped_key = get_str_attribute(attrs, RGW_ATTR_CRYPT_DATAKEY); + if (compat == COMPAT_ONLY_OLD || key_id.rfind("/") != std::string::npos) { + return get_key(key_id, actual_key); + } +/* + .data.ciphertext <- (to-be) named attribute + data: {context ciphertext} + post to prefix + /decrypt/ + key_id + jq: .data.plaintext + return decode_secret(json_obj, actual_key) +*/ + std::string context = get_str_attribute(attrs, RGW_ATTR_CRYPT_CONTEXT); + ZeroPoolDocument d { rapidjson::kObjectType }; + auto &allocator { d.GetAllocator() }; + bufferlist secret_bl; + + add_name_val_to_obj("context", context, d, allocator); + add_name_val_to_obj("ciphertext", wrapped_key, d, allocator); + rapidjson::StringBuffer buf; + rapidjson::Writer<rapidjson::StringBuffer> writer(buf); + if (!d.Accept(writer)) { + ldout(cct, 0) << "ERROR: can't make json for vault" << dendl; + return -EINVAL; + } + std::string post_data { buf.GetString() }; + + int res = send_request("POST", "/decrypt/", key_id, + post_data, secret_bl); + if (res < 0) { + return res; + } + + ldout(cct, 20) << "Parse response into JSON Object" << dendl; + + secret_bl.append('\0'); + rapidjson::StringStream isw(secret_bl.c_str()); + d.SetNull(); + d.ParseStream<>(isw); + + if (d.HasParseError()) { + ldout(cct, 0) << "ERROR: Failed to parse JSON response from Vault: " + << rapidjson::GetParseError_En(d.GetParseError()) << dendl; + return -EINVAL; + } + secret_bl.zero(); + + if (!d.IsObject()) { + ldout(cct, 0) << "ERROR: response from Vault is not an object" << dendl; + return -EINVAL; + } + { + auto data_itr { d.FindMember("data") }; + if (data_itr == d.MemberEnd()) { + ldout(cct, 0) << "ERROR: no .data in response from Vault" << dendl; + return -EINVAL; + } + auto plaintext_itr { data_itr->value.FindMember("plaintext") }; + if (plaintext_itr == data_itr->value.MemberEnd()) { + ldout(cct, 0) << "ERROR: no .data.plaintext in response from Vault" << dendl; + return -EINVAL; + } + auto &plaintext_v { plaintext_itr->value }; + if (!plaintext_v.IsString()) { + ldout(cct, 0) << "ERROR: .data.plaintext not a string in response from Vault" << dendl; + return -EINVAL; + } + return decode_secret(plaintext_v.GetString(), actual_key); + } + } +}; + +class KvSecretEngine: public VaultSecretEngine { + +public: + + KvSecretEngine(CephContext *cct, EngineParmMap parms): VaultSecretEngine(cct){ + if (!parms.empty()) { + lderr(cct) << "ERROR: vault kv secrets engine takes no parameters (ignoring them)" << dendl; + } + } + + virtual ~KvSecretEngine(){} + + int get_key(std::string_view key_id, std::string& actual_key){ + ZeroPoolDocument d; + ZeroPoolValue *v; + bufferlist secret_bl; + + int res = send_request(key_id, secret_bl); + if (res < 0) { + return res; + } + + ldout(cct, 20) << "Parse response into JSON Object" << dendl; + + secret_bl.append('\0'); + rapidjson::StringStream isw(secret_bl.c_str()); + d.ParseStream<>(isw); + + if (d.HasParseError()) { + ldout(cct, 0) << "ERROR: Failed to parse JSON response from Vault: " + << rapidjson::GetParseError_En(d.GetParseError()) << dendl; + return -EINVAL; + } + secret_bl.zero(); + + static const char *elements[] = {"data", "data", "key"}; + v = &d; + for (auto &elem: elements) { + if (!v->IsObject()) { + v = nullptr; + break; + } + auto endr { v->MemberEnd() }; + auto itr { v->FindMember(elem) }; + if (itr == endr) { + v = nullptr; + break; + } + v = &itr->value; + } + if (!v || !v->IsString()) { + ldout(cct, 0) << "ERROR: Key not found in JSON response from Vault using KV Engine" << dendl; + return -EINVAL; + } + return decode_secret(v->GetString(), actual_key); + } + +}; + +class KmipSecretEngine; +class KmipGetTheKey { +private: + CephContext *cct; + std::string work; + bool failed = false; + int ret; +protected: + KmipGetTheKey(CephContext *cct) : cct(cct) {} + KmipGetTheKey& keyid_to_keyname(std::string_view key_id); + KmipGetTheKey& get_uniqueid_for_keyname(); + int get_key_for_uniqueid(std::string &); + friend KmipSecretEngine; +}; + +KmipGetTheKey& +KmipGetTheKey::keyid_to_keyname(std::string_view key_id) +{ + work = cct->_conf->rgw_crypt_kmip_kms_key_template; + std::string keyword = "$keyid"; + std::string replacement = std::string(key_id); + size_t pos = 0; + if (work.length() == 0) { + work = std::move(replacement); + } else { + while (pos < work.length()) { + pos = work.find(keyword, pos); + if (pos == std::string::npos) break; + work.replace(pos, keyword.length(), replacement); + pos += key_id.length(); + } + } + return *this; +} + +KmipGetTheKey& +KmipGetTheKey::get_uniqueid_for_keyname() +{ + RGWKMIPTransceiver secret_req(cct, RGWKMIPTransceiver::LOCATE); + + secret_req.name = work.data(); + ret = secret_req.process(null_yield); + if (ret < 0) { + failed = true; + } else if (!secret_req.outlist->string_count) { + ret = -ENOENT; + lderr(cct) << "error: locate returned no results for " + << secret_req.name << dendl; + failed = true; + } else if (secret_req.outlist->string_count != 1) { + ret = -EINVAL; + lderr(cct) << "error: locate found " + << secret_req.outlist->string_count + << " results for " << secret_req.name << dendl; + failed = true; + } else { + work = std::string(secret_req.outlist->strings[0]); + } + return *this; +} + +int +KmipGetTheKey::get_key_for_uniqueid(std::string& actual_key) +{ + if (failed) return ret; + RGWKMIPTransceiver secret_req(cct, RGWKMIPTransceiver::GET); + secret_req.unique_id = work.data(); + ret = secret_req.process(null_yield); + if (ret < 0) { + failed = true; + } else { + actual_key = std::string((char*)(secret_req.outkey->data), + secret_req.outkey->keylen); + } + return ret; +} + +class KmipSecretEngine: public SecretEngine { + +protected: + CephContext *cct; + +public: + + KmipSecretEngine(CephContext *cct) { + this->cct = cct; + } + + int get_key(std::string_view key_id, std::string& actual_key) + { + int r; + r = KmipGetTheKey{cct} + .keyid_to_keyname(key_id) + .get_uniqueid_for_keyname() + .get_key_for_uniqueid(actual_key); + return r; + } +}; + + +static map<string,string> get_str_map(const string &str) { + map<string,string> m; + get_str_map(str, &m, ";, \t"); + return m; +} + + +static int get_actual_key_from_conf(CephContext *cct, + std::string_view key_id, + std::string_view key_selector, + std::string& actual_key) +{ + int res = 0; + + static map<string,string> str_map = get_str_map( + cct->_conf->rgw_crypt_s3_kms_encryption_keys); + + map<string, string>::iterator it = str_map.find(std::string(key_id)); + if (it == str_map.end()) + return -ERR_INVALID_ACCESS_KEY; + + std::string master_key; + try { + master_key = from_base64((*it).second); + } catch (std::exception&) { + ldout(cct, 5) << "ERROR: get_actual_key_from_conf invalid encryption key id " + << "which contains character that is not base64 encoded." + << dendl; + return -EINVAL; + } + + if (master_key.length() == AES_256_KEYSIZE) { + uint8_t _actual_key[AES_256_KEYSIZE]; + if (AES_256_ECB_encrypt(cct, + reinterpret_cast<const uint8_t*>(master_key.c_str()), AES_256_KEYSIZE, + reinterpret_cast<const uint8_t*>(key_selector.data()), + _actual_key, AES_256_KEYSIZE)) { + actual_key = std::string((char*)&_actual_key[0], AES_256_KEYSIZE); + } else { + res = -EIO; + } + ::ceph::crypto::zeroize_for_security(_actual_key, sizeof(_actual_key)); + } else { + ldout(cct, 20) << "Wrong size for key=" << key_id << dendl; + res = -EIO; + } + + return res; +} + +static int request_key_from_barbican(CephContext *cct, + std::string_view key_id, + const std::string& barbican_token, + std::string& actual_key) { + int res; + + std::string secret_url = cct->_conf->rgw_barbican_url; + if (secret_url.empty()) { + ldout(cct, 0) << "ERROR: conf rgw_barbican_url is not set" << dendl; + return -EINVAL; + } + concat_url(secret_url, "/v1/secrets/"); + concat_url(secret_url, std::string(key_id)); + + bufferlist secret_bl; + RGWHTTPTransceiver secret_req(cct, "GET", secret_url, &secret_bl); + secret_req.append_header("Accept", "application/octet-stream"); + secret_req.append_header("X-Auth-Token", barbican_token); + + res = secret_req.process(null_yield); + if (res < 0) { + return res; + } + if (secret_req.get_http_status() == + RGWHTTPTransceiver::HTTP_STATUS_UNAUTHORIZED) { + return -EACCES; + } + + if (secret_req.get_http_status() >=200 && + secret_req.get_http_status() < 300 && + secret_bl.length() == AES_256_KEYSIZE) { + actual_key.assign(secret_bl.c_str(), secret_bl.length()); + secret_bl.zero(); + } else { + res = -EACCES; + } + return res; +} + +static int get_actual_key_from_barbican(CephContext *cct, + std::string_view key_id, + std::string& actual_key) +{ + int res = 0; + std::string token; + + if (rgw::keystone::Service::get_keystone_barbican_token(cct, token) < 0) { + ldout(cct, 5) << "Failed to retrieve token for Barbican" << dendl; + return -EINVAL; + } + + res = request_key_from_barbican(cct, key_id, token, actual_key); + if (res != 0) { + ldout(cct, 5) << "Failed to retrieve secret from Barbican:" << key_id << dendl; + } + return res; +} + + +std::string config_to_engine_and_parms(CephContext *cct, + const char* which, + std::string& secret_engine_str, + EngineParmMap& secret_engine_parms) +{ + std::ostringstream oss; + std::vector<std::string> secret_engine_v; + std::string secret_engine; + + get_str_vec(secret_engine_str, " ", secret_engine_v); + + cct->_conf.early_expand_meta(secret_engine_str, &oss); + auto meta_errors {oss.str()}; + if (meta_errors.length()) { + meta_errors.erase(meta_errors.find_last_not_of("\n")+1); + lderr(cct) << "ERROR: while expanding " << which << ": " + << meta_errors << dendl; + } + for (auto& e: secret_engine_v) { + if (!secret_engine.length()) { + secret_engine = std::move(e); + continue; + } + auto p { e.find('=') }; + if (p == std::string::npos) { + secret_engine_parms.emplace(std::move(e), ""); + continue; + } + std::string key{ e.substr(0,p) }; + std::string val{ e.substr(p+1) }; + secret_engine_parms.emplace(std::move(key), std::move(val)); + } + return secret_engine; +} + + +static int get_actual_key_from_vault(CephContext *cct, + map<string, bufferlist>& attrs, + std::string& actual_key, bool make_it) +{ + std::string secret_engine_str = cct->_conf->rgw_crypt_vault_secret_engine; + EngineParmMap secret_engine_parms; + auto secret_engine { config_to_engine_and_parms( + cct, "rgw_crypt_vault_secret_engine", + secret_engine_str, secret_engine_parms) }; + ldout(cct, 20) << "Vault authentication method: " << cct->_conf->rgw_crypt_vault_auth << dendl; + ldout(cct, 20) << "Vault Secrets Engine: " << secret_engine << dendl; + + if (RGW_SSE_KMS_VAULT_SE_KV == secret_engine){ + std::string key_id = get_str_attribute(attrs, RGW_ATTR_CRYPT_KEYID); + KvSecretEngine engine(cct, std::move(secret_engine_parms)); + return engine.get_key(key_id, actual_key); + } + else if (RGW_SSE_KMS_VAULT_SE_TRANSIT == secret_engine){ + TransitSecretEngine engine(cct, std::move(secret_engine_parms)); + std::string key_id = get_str_attribute(attrs, RGW_ATTR_CRYPT_KEYID); + return make_it + ? engine.make_actual_key(attrs, actual_key) + : engine.reconstitute_actual_key(attrs, actual_key); + } + else { + ldout(cct, 0) << "Missing or invalid secret engine" << dendl; + return -EINVAL; + } +} + + +static int make_actual_key_from_vault(CephContext *cct, + map<string, bufferlist>& attrs, + std::string& actual_key) +{ + return get_actual_key_from_vault(cct, attrs, actual_key, true); +} + + +static int reconstitute_actual_key_from_vault(CephContext *cct, + map<string, bufferlist>& attrs, + std::string& actual_key) +{ + return get_actual_key_from_vault(cct, attrs, actual_key, false); +} + + +static int get_actual_key_from_kmip(CephContext *cct, + std::string_view key_id, + std::string& actual_key) +{ + std::string secret_engine = RGW_SSE_KMS_KMIP_SE_KV; + + if (RGW_SSE_KMS_KMIP_SE_KV == secret_engine){ + KmipSecretEngine engine(cct); + return engine.get_key(key_id, actual_key); + } + else{ + ldout(cct, 0) << "Missing or invalid secret engine" << dendl; + return -EINVAL; + } +} + + +int reconstitute_actual_key_from_kms(CephContext *cct, + map<string, bufferlist>& attrs, + std::string& actual_key) +{ + std::string key_id = get_str_attribute(attrs, RGW_ATTR_CRYPT_KEYID); + std::string kms_backend { cct->_conf->rgw_crypt_s3_kms_backend }; + + ldout(cct, 20) << "Getting KMS encryption key for key " << key_id << dendl; + ldout(cct, 20) << "SSE-KMS backend is " << kms_backend << dendl; + + if (RGW_SSE_KMS_BACKEND_BARBICAN == kms_backend) { + return get_actual_key_from_barbican(cct, key_id, actual_key); + } + + if (RGW_SSE_KMS_BACKEND_VAULT == kms_backend) { + return reconstitute_actual_key_from_vault(cct, attrs, actual_key); + } + + if (RGW_SSE_KMS_BACKEND_KMIP == kms_backend) { + return get_actual_key_from_kmip(cct, key_id, actual_key); + } + + if (RGW_SSE_KMS_BACKEND_TESTING == kms_backend) { + std::string key_selector = get_str_attribute(attrs, RGW_ATTR_CRYPT_KEYSEL); + return get_actual_key_from_conf(cct, key_id, key_selector, actual_key); + } + + ldout(cct, 0) << "ERROR: Invalid rgw_crypt_s3_kms_backend: " << kms_backend << dendl; + return -EINVAL; +} + +int make_actual_key_from_kms(CephContext *cct, + map<string, bufferlist>& attrs, + std::string& actual_key) +{ + std::string kms_backend { cct->_conf->rgw_crypt_s3_kms_backend }; + if (RGW_SSE_KMS_BACKEND_VAULT == kms_backend) + return make_actual_key_from_vault(cct, attrs, actual_key); + return reconstitute_actual_key_from_kms(cct, attrs, actual_key); +} |