mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2025-09-05 22:32:55 +02:00
66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* (c) ZeroTier, Inc.
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* https://www.zerotier.com/
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*/
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#include "Capability.hpp"
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#include "Identity.hpp"
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#include "Network.hpp"
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#include "Node.hpp"
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#include "RuntimeEnvironment.hpp"
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#include "Switch.hpp"
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#include "Topology.hpp"
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namespace ZeroTier {
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int Capability::verify(const RuntimeEnvironment* RR, void* tPtr) const
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{
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try {
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// There must be at least one entry, and sanity check for bad chain max length
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if ((_maxCustodyChainLength < 1) || (_maxCustodyChainLength > ZT_MAX_CAPABILITY_CUSTODY_CHAIN_LENGTH)) {
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return -1;
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}
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// Validate all entries in chain of custody
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Buffer<(sizeof(Capability) * 2)> tmp;
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this->serialize(tmp, true);
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for (unsigned int c = 0; c < _maxCustodyChainLength; ++c) {
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if (c == 0) {
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if ((! _custody[c].to) || (! _custody[c].from) || (_custody[c].from != Network::controllerFor(_nwid))) {
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return -1; // the first entry must be present and from the network's controller
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}
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}
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else {
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if (! _custody[c].to) {
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return 0; // all previous entries were valid, so we are valid
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}
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else if ((! _custody[c].from) || (_custody[c].from != _custody[c - 1].to)) {
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return -1; // otherwise if we have another entry it must be from the previous holder in the chain
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}
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}
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const Identity id(RR->topology->getIdentity(tPtr, _custody[c].from));
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if (id) {
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if (! id.verify(tmp.data(), tmp.size(), _custody[c].signature)) {
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return -1;
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}
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}
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else {
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RR->sw->requestWhois(tPtr, RR->node->now(), _custody[c].from);
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return 1;
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}
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}
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// We reached max custody chain length and everything was valid
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return 0;
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}
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catch (...) {
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}
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return -1;
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}
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} // namespace ZeroTier
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