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SimulPiscator
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| # Configure access to the AirSane server by IP address. | ||
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| # If this file is empty, access is allowed from anywhere. | ||
| # Each entry is either Deny or Allow (or a comment). | ||
| # Following the Deny or Allow is an IP address (ranges allowed). | ||
| # Entries are matched from top to bottom. When the first match is found, | ||
| # the result will be "Allow" if it is an Allow entry, and will be "Deny" | ||
| # if it is a Deny entry. | ||
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| # If no match occurs, a "Deny" will be the result. As an exception to | ||
| # this rule, an empty list will always result in an "Allow". | ||
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| allow 127.0.0.0/8 | ||
| allow 10.0.0.0/8 | ||
| allow 172.16.0.0/12 | ||
| allow 192.168.0.0/16 | ||
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| allow ::1 | ||
| allow fe80::/10 | ||
| allow fec0::/10 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| /* | ||
| AirSane Imaging Daemon | ||
| Copyright (C) 2018-2023 Simul Piscator | ||
| This program is free software: you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation, either version 3 of the License, or | ||
| (at your option) any later version. | ||
| 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, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
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| #include "accessfile.h" | ||
| #include <fstream> | ||
| #include <sstream> | ||
| #include <cstring> | ||
| #include <cassert> | ||
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||
| namespace { | ||
| bool SetMaskBits(HttpServer::Sockaddr& mask, int bits) | ||
| { | ||
| int width = 0; | ||
| char* data = nullptr; | ||
| if (mask.sa.sa_family == AF_INET) { | ||
| width = 32; | ||
| data = reinterpret_cast<char*>(&mask.in.sin_addr); | ||
| } | ||
| else if (mask.sa.sa_family == AF_INET6) { | ||
| width = 128; | ||
| data = reinterpret_cast<char*>(&mask.in6.sin6_addr); | ||
| } | ||
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| if (bits > width) | ||
| return false; | ||
| if (!data) | ||
| return false; | ||
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| ::memset(data, width / 8, 0); | ||
| for (int i = 0; i < bits; ++i) { | ||
| int byte = i / 8, bit = i % 8; | ||
| data[byte] |= (1 << bit); | ||
| } | ||
| return true; | ||
| } | ||
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| bool MatchAddresses(const HttpServer::Sockaddr& inAddr1, const HttpServer::Sockaddr& inAddr2, const HttpServer::Sockaddr& inMask) | ||
| { | ||
| if (inAddr1.sa.sa_family != inAddr2.sa.sa_family) | ||
| return false; | ||
| assert(inAddr2.sa.sa_family == inMask.sa.sa_family); | ||
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| int width = 0; | ||
| const char* data1 = nullptr, *data2 = nullptr, *maskdata = nullptr; | ||
| if (inMask.sa.sa_family == AF_INET) { | ||
| width = 32; | ||
| data1 = reinterpret_cast<const char*>(&inAddr1.in.sin_addr); | ||
| data2 = reinterpret_cast<const char*>(&inAddr2.in.sin_addr); | ||
| maskdata = reinterpret_cast<const char*>(&inMask.in.sin_addr); | ||
| } | ||
| else if (inMask.sa.sa_family == AF_INET6) { | ||
| width = 128; | ||
| data1 = reinterpret_cast<const char*>(&inAddr1.in6.sin6_addr); | ||
| data2 = reinterpret_cast<const char*>(&inAddr2.in6.sin6_addr); | ||
| maskdata = reinterpret_cast<const char*>(&inMask.in6.sin6_addr); | ||
| } | ||
| for (int i = 0; i < width / 8; ++i) { | ||
| char c1 = data1[i] & maskdata[i], | ||
| c2 = data2[i] & maskdata[i]; | ||
| if (c1 != c2) | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
| } | ||
|
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| AccessFile::AccessFile(const std::string& path) | ||
| { | ||
| if (path.empty()) | ||
| return; | ||
| std::ifstream file(path); | ||
| if (!file.is_open()) | ||
| return; | ||
| std::string line; | ||
| while (std::getline(file, line)) { | ||
| while (!line.empty() && std::iswspace(line.front())) | ||
| line = line.substr(1); | ||
| while (!line.empty() && std::iswspace(line.back())) | ||
| line.pop_back(); | ||
| if (line.empty()) | ||
| continue; | ||
| if (line.front() == '#') | ||
| continue; | ||
| std::istringstream iss(line); | ||
| Entry entry; | ||
| if (!entry.parse(iss)) | ||
| mErrors += "Illegal entry: " + line + "\n"; | ||
| else | ||
| mEntries.push_back(entry); | ||
| } | ||
| } | ||
|
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| const std::string& AccessFile::errors() const | ||
| { | ||
| return mErrors; | ||
| } | ||
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| bool AccessFile::isAllowed(const HttpServer::Sockaddr& addr) const | ||
| { | ||
| if (mEntries.empty()) | ||
| return true; | ||
| for (const auto& entry : mEntries) { | ||
| int result = entry.match(addr); | ||
| if (result == Entry::Allow) | ||
| return true; | ||
| if (result == Entry::Deny) | ||
| return false; | ||
| } | ||
| return false; | ||
| } | ||
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| std::istream& AccessFile::Entry::parse(std::istream& is) | ||
| { | ||
| std::string kind, address; | ||
| is >> kind; | ||
| if (!::strcasecmp(kind.c_str(), "allow")) | ||
| mKind = Allow; | ||
| else if (!::strcasecmp(kind.c_str(), "deny")) | ||
| mKind = Deny; | ||
| else | ||
| is.setstate(std::ios::failbit); | ||
| std::getline(is >> std::ws, address); | ||
| int bits = -1; | ||
| size_t pos = address.find_last_of("/"); | ||
| if (pos != std::string::npos) { | ||
| bits = ::atoi(address.substr(pos + 1).c_str()); | ||
| address = address.substr(0, pos); | ||
| } | ||
| if (::inet_pton(AF_INET, address.c_str(), &mAddress.in.sin_addr)) { | ||
| if (bits == -1) | ||
| bits = 32; | ||
| mAddress.sa.sa_family = AF_INET; | ||
| mMask = mAddress; | ||
| SetMaskBits(mMask, bits); | ||
| } | ||
| else if (::inet_pton(AF_INET6, address.c_str(), &mAddress.in6.sin6_addr)) { | ||
| if (bits == -1) | ||
| bits = 128; | ||
| mAddress.sa.sa_family = AF_INET6; | ||
| mMask = mAddress; | ||
| SetMaskBits(mMask, bits); | ||
| } | ||
| else { | ||
| is.setstate(std::ios::failbit); | ||
| } | ||
| return is; | ||
| } | ||
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| int AccessFile::Entry::match(const HttpServer::Sockaddr &addr) const | ||
| { | ||
| if (!MatchAddresses(addr, mAddress, mMask)) | ||
| return NoMatch; | ||
| return mKind; | ||
| } |
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