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65 lines
2.2 KiB
65 lines
2.2 KiB
/* |
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* ZeroTier One - Network Virtualization Everywhere |
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* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/ |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#include "Capability.hpp" |
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#include "RuntimeEnvironment.hpp" |
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#include "Identity.hpp" |
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#include "Topology.hpp" |
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#include "Switch.hpp" |
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#include "Network.hpp" |
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namespace ZeroTier { |
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int Capability::verify(const RuntimeEnvironment *RR) 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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// 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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} 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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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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const Identity id(RR->topology->getIdentity(_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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} else { |
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RR->sw->requestWhois(_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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} catch ( ... ) {} |
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return -1; |
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} |
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} // namespace ZeroTier
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