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71 lines
1.9 KiB
71 lines
1.9 KiB
/* |
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* Copyright (c)2019 ZeroTier, Inc. |
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* |
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* Use of this software is governed by the Business Source License included |
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* in the LICENSE.TXT file in the project's root directory. |
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* |
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* Change Date: 2026-01-01 |
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* |
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* On the date above, in accordance with the Business Source License, use |
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* of this software will be governed by version 2.0 of the Apache License. |
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*/ |
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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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