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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <map>
#include <string>
#include "namespaces.hh"
#include "dns.hh"
#include "dnsparser.hh"
#include "dnspacket.hh"
#include "dnsrecords.hh"
#include "logger.hh"
#include "lock.hh"
#include "arguments.hh"
#include <boost/shared_ptr.hpp>
#include <boost/make_shared.hpp>
#include "gss_context.hh"
#ifndef ENABLE_GSS_TSIG
bool GssContext::supported() { return false; }
GssContext::GssContext() { d_error = GSS_CONTEXT_UNSUPPORTED; d_type = GSS_CONTEXT_NONE; }
GssContext::GssContext(const DNSName& label) { d_error = GSS_CONTEXT_UNSUPPORTED; d_type = GSS_CONTEXT_NONE; }
void GssContext::setLocalPrincipal(const std::string& name) {}
bool GssContext::getLocalPrincipal(std::string& name) { return false; }
void GssContext::setPeerPrincipal(const std::string& name) {}
bool GssContext::getPeerPrincipal(std::string& name) { return false; }
void GssContext::generateLabel(const std::string& suffix) {}
void GssContext::setLabel(const DNSName& label) {}
bool GssContext::init(const std::string &input, std::string& output) { return false; }
bool GssContext::accept(const std::string &input, std::string& output) { return false; }
bool GssContext::destroy() { return false; }
bool GssContext::expired() { return false; }
bool GssContext::valid() { return false; }
bool GssContext::sign(const std::string &input, std::string& output) { return false; }
bool GssContext::verify(const std::string &input, const std::string &signature) { return false; }
GssContextError GssContext::getError() { return GSS_CONTEXT_UNSUPPORTED; }
#else
class GssCredential : boost::noncopyable {
public:
GssCredential(const std::string& name, const gss_cred_usage_t usage) {
gss_buffer_desc buffer;
d_name = GSS_C_NO_NAME;
d_nameS = name;
d_cred = GSS_C_NO_CREDENTIAL;
d_usage = usage;
d_valid = false;
if (name.empty() == false) {
buffer.length = name.size();
buffer.value = (void*)name.c_str();
d_maj = gss_import_name(&d_min, &buffer, (gss_OID)GSS_KRB5_NT_PRINCIPAL_NAME, &d_name);
if (d_maj != GSS_S_COMPLETE) {
d_valid = false;
return;
}
}
renew();
};
~GssCredential() {
OM_uint32 tmp_maj __attribute__((unused)), tmp_min __attribute__((unused));
if (d_cred != GSS_C_NO_CREDENTIAL)
tmp_maj = gss_release_cred(&tmp_min, &d_cred);
if (d_name != GSS_C_NO_NAME)
tmp_maj = gss_release_name(&tmp_min, &d_name);
};
bool expired() const {
if (d_expires == -1) return false;
return time((time_t*)NULL)>d_expires;
}
bool renew() {
OM_uint32 time_rec, tmp_maj __attribute__((unused)), tmp_min __attribute__((unused));
d_maj = gss_acquire_cred(&d_min, d_name, GSS_C_INDEFINITE, GSS_C_NO_OID_SET, d_usage, &d_cred, NULL, &time_rec);
if (d_maj != GSS_S_COMPLETE) {
d_valid = false;
tmp_maj = gss_release_name(&tmp_min, &d_name);
d_name = GSS_C_NO_NAME;
return false;
}
d_valid = true;
if (time_rec > GSS_C_INDEFINITE) {
d_expires = time((time_t*)NULL)+time_rec;
} else {
d_expires = -1;
}
return true;
}
bool valid() {
return d_valid && !expired();
}
OM_uint32 d_maj,d_min;
bool d_valid;
int64_t d_expires;
std::string d_nameS;
gss_name_t d_name;
gss_cred_id_t d_cred;
gss_cred_usage_t d_usage;
};
std::map<std::string, boost::shared_ptr<GssCredential> > s_gss_accept_creds;
std::map<std::string, boost::shared_ptr<GssCredential> > s_gss_init_creds;
class GssSecContext : boost::noncopyable {
public:
GssSecContext(boost::shared_ptr<GssCredential> cred) {
if (cred->valid() == false) throw PDNSException("Invalid credential " + cred->d_nameS);
d_cred = cred;
d_state = GssStateInitial;
d_ctx = GSS_C_NO_CONTEXT;
d_expires = 0;
d_maj = d_min = 0;
d_peer_name = GSS_C_NO_NAME;
d_type = GSS_CONTEXT_NONE;
}
~GssSecContext() {
OM_uint32 tmp_maj __attribute__((unused)), tmp_min __attribute__((unused));
if (d_ctx != GSS_C_NO_CONTEXT) {
tmp_maj = gss_delete_sec_context(&tmp_min, &d_ctx, GSS_C_NO_BUFFER);
}
if (d_peer_name != GSS_C_NO_NAME) {
tmp_maj = gss_release_name(&tmp_min, &(d_peer_name));
}
}
GssContextType d_type;
gss_ctx_id_t d_ctx;
gss_name_t d_peer_name;
int64_t d_expires;
boost::shared_ptr<GssCredential> d_cred;
OM_uint32 d_maj,d_min;
enum {
GssStateInitial,
GssStateNegotiate,
GssStateComplete,
GssStateError
} d_state;
};
std::map<DNSName, boost::shared_ptr<GssSecContext> > s_gss_sec_context;
bool GssContext::supported() { return true; }
void GssContext::initialize() {
d_peerPrincipal = "";
d_localPrincipal = "";
d_error = GSS_CONTEXT_NO_ERROR;
d_type = GSS_CONTEXT_NONE;
}
GssContext::GssContext() {
initialize();
generateLabel("pdns.tsig.");
}
GssContext::GssContext(const DNSName& label) {
initialize();
setLabel(label);
}
void GssContext::generateLabel(const std::string& suffix) {
std::ostringstream oss;
oss << std::hex << time((time_t*)NULL) << "." << suffix;
setLabel(DNSName(oss.str()));
}
void GssContext::setLabel(const DNSName& label) {
d_label = label;
if (s_gss_sec_context.find(d_label) != s_gss_sec_context.end()) {
d_ctx = s_gss_sec_context[d_label];
d_type = d_ctx->d_type;
}
}
bool GssContext::expired() {
return (!d_ctx || (d_ctx->d_expires > -1 && d_ctx->d_expires < time((time_t*)NULL)));
}
bool GssContext::valid() {
return (d_ctx && !expired() && d_ctx->d_state == GssSecContext::GssStateComplete);
}
bool GssContext::init(const std::string &input, std::string& output) {
OM_uint32 tmp_maj __attribute__((unused)), tmp_min __attribute__((unused));
OM_uint32 maj,min;
gss_buffer_desc recv_tok, send_tok, buffer;
OM_uint32 flags;
OM_uint32 expires;
boost::shared_ptr<GssCredential> cred;
if (d_label.empty()) {
d_error = GSS_CONTEXT_INVALID;
return false;
}
d_type = GSS_CONTEXT_INIT;
if (s_gss_init_creds.find(d_localPrincipal) != s_gss_init_creds.end()) {
cred = s_gss_init_creds[d_localPrincipal];
} else {
s_gss_init_creds[d_localPrincipal] = boost::make_shared<GssCredential>(d_localPrincipal, GSS_C_INITIATE);
cred = s_gss_init_creds[d_localPrincipal];
}
// see if we can find a context in non-completed state
if (d_ctx) {
if (d_ctx->d_state != GssSecContext::GssStateNegotiate) {
d_error = GSS_CONTEXT_INVALID;
return false;
}
} else {
// make context
s_gss_sec_context[d_label] = boost::make_shared<GssSecContext>(cred);
s_gss_sec_context[d_label]->d_type = d_type;
d_ctx = s_gss_sec_context[d_label];
d_ctx->d_state = GssSecContext::GssStateNegotiate;
}
recv_tok.length = input.size();
recv_tok.value = (void*)input.c_str();
if (d_peerPrincipal.empty() == false) {
buffer.value = (void*)d_peerPrincipal.c_str();
buffer.length = d_peerPrincipal.size();
maj = gss_import_name(&min, &buffer, (gss_OID)GSS_KRB5_NT_PRINCIPAL_NAME, &(d_ctx->d_peer_name));
if (maj != GSS_S_COMPLETE) {
processError("gss_import_name", maj, min);
return false;
}
}
maj = gss_init_sec_context(&min, cred->d_cred, &(d_ctx->d_ctx), d_ctx->d_peer_name, GSS_C_NO_OID, GSS_C_MUTUAL_FLAG|GSS_C_REPLAY_FLAG, GSS_C_INDEFINITE, GSS_C_NO_CHANNEL_BINDINGS, &recv_tok, NULL, &send_tok, &flags, &expires);
if (send_tok.length>0) {
output.assign((const char*)send_tok.value, send_tok.length);
tmp_maj = gss_release_buffer(&tmp_min, &send_tok);
}
if (maj == GSS_S_COMPLETE) {
if (expires > GSS_C_INDEFINITE) {
d_ctx->d_expires = time((time_t*)NULL) + expires;
} else {
d_ctx->d_expires = -1;
}
d_ctx->d_state = GssSecContext::GssStateComplete;
return true;
} else if (maj != GSS_S_CONTINUE_NEEDED) {
processError("gss_init_sec_context", maj,min);
}
return (maj == GSS_S_CONTINUE_NEEDED);
}
bool GssContext::accept(const std::string &input, std::string& output) {
OM_uint32 tmp_maj __attribute__((unused)), tmp_min __attribute__((unused));
OM_uint32 maj,min;
gss_buffer_desc recv_tok, send_tok;
OM_uint32 flags;
OM_uint32 expires;
boost::shared_ptr<GssCredential> cred;
if (d_label.empty()) {
d_error = GSS_CONTEXT_INVALID;
return false;
}
d_type = GSS_CONTEXT_ACCEPT;
if (s_gss_accept_creds.find(d_localPrincipal) != s_gss_accept_creds.end()) {
cred = s_gss_accept_creds[d_localPrincipal];
} else {
s_gss_accept_creds[d_localPrincipal] = boost::make_shared<GssCredential>(d_localPrincipal, GSS_C_ACCEPT);
cred = s_gss_accept_creds[d_localPrincipal];
}
// see if we can find a context in non-completed state
if (d_ctx) {
if (d_ctx->d_state != GssSecContext::GssStateNegotiate) {
d_error = GSS_CONTEXT_INVALID;
return false;
}
} else {
// make context
s_gss_sec_context[d_label] = boost::make_shared<GssSecContext>(cred);
s_gss_sec_context[d_label]->d_type = d_type;
d_ctx = s_gss_sec_context[d_label];
d_ctx->d_state = GssSecContext::GssStateNegotiate;
}
recv_tok.length = input.size();
recv_tok.value = (void*)input.c_str();
maj = gss_accept_sec_context(&min, &(d_ctx->d_ctx), cred->d_cred, &recv_tok, GSS_C_NO_CHANNEL_BINDINGS, &(d_ctx->d_peer_name), NULL, &send_tok, &flags, &expires, NULL);
if (send_tok.length>0) {
output.assign((const char*)send_tok.value, send_tok.length);
tmp_maj = gss_release_buffer(&tmp_min, &send_tok);
}
if (maj == GSS_S_COMPLETE) {
if (expires > GSS_C_INDEFINITE) {
d_ctx->d_expires = time((time_t*)NULL) + expires;
} else {
d_ctx->d_expires = -1;
}
d_ctx->d_state = GssSecContext::GssStateComplete;
return true;
} else if (maj != GSS_S_CONTINUE_NEEDED) {
processError("gss_accept_sec_context", maj,min);
}
return (maj == GSS_S_CONTINUE_NEEDED);
};
bool GssContext::sign(const std::string& input, std::string& output) {
OM_uint32 tmp_maj __attribute__((unused)), tmp_min __attribute__((unused));
OM_uint32 maj,min;
gss_buffer_desc recv_tok = GSS_C_EMPTY_BUFFER;
gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
recv_tok.length = input.size();
recv_tok.value = (void*)input.c_str();
maj = gss_get_mic(&min, d_ctx->d_ctx, GSS_C_QOP_DEFAULT, &recv_tok, &send_tok);
if (send_tok.length>0) {
output.assign((const char*)send_tok.value, send_tok.length);
tmp_maj = gss_release_buffer(&tmp_min, &send_tok);
}
if (maj != GSS_S_COMPLETE) {
processError("gss_get_mic", maj,min);
}
return (maj == GSS_S_COMPLETE);
}
bool GssContext::verify(const std::string& input, const std::string& signature) {
OM_uint32 maj,min;
gss_buffer_desc recv_tok = GSS_C_EMPTY_BUFFER;
gss_buffer_desc sign_tok = GSS_C_EMPTY_BUFFER;
recv_tok.length = input.size();
recv_tok.value = (void*)input.c_str();
sign_tok.length = signature.size();
sign_tok.value = (void*)signature.c_str();
maj = gss_verify_mic(&min, d_ctx->d_ctx, &recv_tok, &sign_tok, NULL);
if (maj != GSS_S_COMPLETE) {
processError("gss_get_mic", maj,min);
}
return (maj == GSS_S_COMPLETE);
}
bool GssContext::destroy() {
return false;
}
void GssContext::setLocalPrincipal(const std::string& name) {
d_localPrincipal = name;
}
bool GssContext::getLocalPrincipal(std::string& name) {
name = d_localPrincipal;
return name.size()>0;
}
void GssContext::setPeerPrincipal(const std::string& name) {
d_peerPrincipal = name;
}
bool GssContext::getPeerPrincipal(std::string& name) {
gss_buffer_desc value;
OM_uint32 maj,min;
if (d_ctx->d_peer_name != GSS_C_NO_NAME) {
maj = gss_display_name(&min, d_ctx->d_peer_name, &value, NULL);
if (maj == GSS_S_COMPLETE && value.length > 0) {
name.assign((const char*)value.value, value.length);
maj = gss_release_buffer(&min, &value);
return true;
} else {
return false;
}
} else {
return false;
}
}
void GssContext::processError(const std::string& method, OM_uint32 maj, OM_uint32 min) {
OM_uint32 tmp_min;
gss_buffer_desc msg;
OM_uint32 msg_ctx;
msg_ctx = 0;
while (1) {
ostringstream oss;
gss_display_status(&tmp_min, maj, GSS_C_GSS_CODE, GSS_C_NULL_OID, &msg_ctx, &msg);
oss << method << ": " << (char*)msg.value;
d_gss_errors.push_back(oss.str());
if (!msg_ctx) break;
}
msg_ctx = 0;
while (1) {
ostringstream oss;
gss_display_status(&tmp_min, min, GSS_C_MECH_CODE, GSS_C_NULL_OID, &msg_ctx, &msg);
oss << method << ": " << (char*)msg.value;
d_gss_errors.push_back(oss.str());
if (!msg_ctx) break;
}
}
#endif
bool gss_add_signature(const DNSName& context, const std::string& message, std::string& mac) {
string tmp_mac;
GssContext gssctx(context);
if (!gssctx.valid()) {
L<<Logger::Error<<"GSS context '"<<context<<"' is not valid"<<endl;
for(const string& error : gssctx.getErrorStrings()) {
L<<Logger::Error<<"GSS error: "<<error<<endl;;
}
return false;
}
if (!gssctx.sign(message, tmp_mac)) {
L<<Logger::Error<<"Could not sign message using GSS context '"<<context<<"'"<<endl;
for(const string& error : gssctx.getErrorStrings()) {
L<<Logger::Error<<"GSS error: "<<error<<endl;;
}
return false;
}
mac = tmp_mac;
return true;
}
bool gss_verify_signature(const DNSName& context, const std::string& message, const std::string& mac) {
GssContext gssctx(context);
if (!gssctx.valid()) {
L<<Logger::Error<<"GSS context '"<<context<<"' is not valid"<<endl;
for(const string& error : gssctx.getErrorStrings()) {
L<<Logger::Error<<"GSS error: "<<error<<endl;;
}
return false;
}
if (!gssctx.verify(message, mac)) {
L<<Logger::Error<<"Could not verify message using GSS context '"<<context<<"'"<<endl;
for(const string& error : gssctx.getErrorStrings()) {
L<<Logger::Error<<"GSS error: "<<error<<endl;;
}
return false;
}
return true;
}
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