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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * SPDX-License-Identifier: EUPL-1.2 |
| 5 | * |
| 6 | * This file is part of icap-flow. |
| 7 | * |
| 8 | * Licensed under the EUPL, Version 1.2 only (the "Licence"); |
| 9 | * you may not use this work except in compliance with the Licence. |
| 10 | * You may obtain a copy of the Licence at: |
| 11 | * |
| 12 | * https://joinup.ec.europa.eu/collection/eupl/eupl-text-eupl-12 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the Licence is distributed on an "AS IS" basis, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | */ |
| 18 | |
| 19 | declare(strict_types=1); |
| 20 | |
| 21 | namespace Ndrstmr\Icap; |
| 22 | |
| 23 | use Amp\Socket\ClientTlsContext; |
| 24 | |
| 25 | /** |
| 26 | * Transport, timeout, security and DoS-limit configuration for the |
| 27 | * ICAP clients. |
| 28 | */ |
| 29 | final readonly class Config |
| 30 | { |
| 31 | private const int DEFAULT_MAX_RESPONSE_SIZE = 10 * 1024 * 1024; |
| 32 | private const int DEFAULT_MAX_HEADER_COUNT = 100; |
| 33 | private const int DEFAULT_MAX_HEADER_LINE = 8192; |
| 34 | |
| 35 | /** @var list<string> */ |
| 36 | private array $virusFoundHeaders; |
| 37 | |
| 38 | /** |
| 39 | * @param string $host Hostname or IP of the ICAP server |
| 40 | * @param int $port TCP port, defaults to 1344 (11344 is the common TLS port) |
| 41 | * @param float $socketTimeout Timeout in seconds for establishing the connection |
| 42 | * @param float $streamTimeout Timeout in seconds for reading/writing |
| 43 | * @param string $virusFoundHeader Legacy single virus header (back-compat). The client now |
| 44 | * consults a list; this value seeds it when |
| 45 | * $virusFoundHeaders is null. |
| 46 | * @param ClientTlsContext|null $tlsContext When set, the async transport upgrades the connection to TLS (icaps://) |
| 47 | * @param int $maxResponseSize DoS ceiling for total bytes accepted from a single ICAP response |
| 48 | * @param int $maxHeaderCount DoS ceiling for total header lines in the ICAP head block |
| 49 | * @param int $maxHeaderLineLength DoS ceiling for a single header line length (bytes) |
| 50 | * @param list<string>|null $virusFoundHeaders Ordered list of vendor virus-name headers; |
| 51 | * null falls back to [$virusFoundHeader]. |
| 52 | */ |
| 53 | public function __construct( |
| 54 | public string $host, |
| 55 | public int $port = 1344, |
| 56 | private float $socketTimeout = 10.0, |
| 57 | private float $streamTimeout = 10.0, |
| 58 | string $virusFoundHeader = 'X-Virus-Name', |
| 59 | private ?ClientTlsContext $tlsContext = null, |
| 60 | private int $maxResponseSize = self::DEFAULT_MAX_RESPONSE_SIZE, |
| 61 | private int $maxHeaderCount = self::DEFAULT_MAX_HEADER_COUNT, |
| 62 | private int $maxHeaderLineLength = self::DEFAULT_MAX_HEADER_LINE, |
| 63 | ?array $virusFoundHeaders = null, |
| 64 | ) { |
| 65 | $this->virusFoundHeaders = $virusFoundHeaders ?? [$virusFoundHeader]; |
| 66 | } |
| 67 | |
| 68 | public function getSocketTimeout(): float |
| 69 | { |
| 70 | return $this->socketTimeout; |
| 71 | } |
| 72 | |
| 73 | public function getStreamTimeout(): float |
| 74 | { |
| 75 | return $this->streamTimeout; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Legacy accessor — returns the first configured virus header. |
| 80 | * Prefer {@see getVirusFoundHeaders()} for new code; this method |
| 81 | * stays for back-compat with v1 callers. |
| 82 | */ |
| 83 | public function getVirusFoundHeader(): string |
| 84 | { |
| 85 | return $this->virusFoundHeaders[0]; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Ordered list of ICAP headers inspected for infection signals. |
| 90 | * The first header that is present in the server's response wins. |
| 91 | * Different vendors use different headers — c-icap / ClamAV use |
| 92 | * `X-Virus-Name`; Trend Micro reports via `X-Violations-Found`, |
| 93 | * ISS Proventia via `X-Infection-Found`, Symantec via `X-Virus-ID`. |
| 94 | * |
| 95 | * @return list<string> |
| 96 | */ |
| 97 | public function getVirusFoundHeaders(): array |
| 98 | { |
| 99 | return $this->virusFoundHeaders; |
| 100 | } |
| 101 | |
| 102 | public function withVirusFoundHeader(string $headerName): self |
| 103 | { |
| 104 | return $this->withVirusFoundHeaders([$headerName]); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * @param list<string> $headerNames |
| 109 | */ |
| 110 | public function withVirusFoundHeaders(array $headerNames): self |
| 111 | { |
| 112 | if ($headerNames === []) { |
| 113 | throw new \InvalidArgumentException('virusFoundHeaders must contain at least one header name.'); |
| 114 | } |
| 115 | |
| 116 | return new self( |
| 117 | host: $this->host, |
| 118 | port: $this->port, |
| 119 | socketTimeout: $this->socketTimeout, |
| 120 | streamTimeout: $this->streamTimeout, |
| 121 | virusFoundHeader: $headerNames[0], |
| 122 | tlsContext: $this->tlsContext, |
| 123 | maxResponseSize: $this->maxResponseSize, |
| 124 | maxHeaderCount: $this->maxHeaderCount, |
| 125 | maxHeaderLineLength: $this->maxHeaderLineLength, |
| 126 | virusFoundHeaders: $headerNames, |
| 127 | ); |
| 128 | } |
| 129 | |
| 130 | public function getTlsContext(): ?ClientTlsContext |
| 131 | { |
| 132 | return $this->tlsContext; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Return a new instance with the supplied TLS context. Pass an |
| 137 | * amphp/socket {@see ClientTlsContext}; the async transport will |
| 138 | * upgrade the connection via `Socket\connectTls()`. |
| 139 | */ |
| 140 | public function withTlsContext(?ClientTlsContext $tlsContext): self |
| 141 | { |
| 142 | return new self( |
| 143 | host: $this->host, |
| 144 | port: $this->port, |
| 145 | socketTimeout: $this->socketTimeout, |
| 146 | streamTimeout: $this->streamTimeout, |
| 147 | virusFoundHeader: $this->virusFoundHeaders[0], |
| 148 | tlsContext: $tlsContext, |
| 149 | maxResponseSize: $this->maxResponseSize, |
| 150 | maxHeaderCount: $this->maxHeaderCount, |
| 151 | maxHeaderLineLength: $this->maxHeaderLineLength, |
| 152 | virusFoundHeaders: $this->virusFoundHeaders, |
| 153 | ); |
| 154 | } |
| 155 | |
| 156 | public function getMaxResponseSize(): int |
| 157 | { |
| 158 | return $this->maxResponseSize; |
| 159 | } |
| 160 | |
| 161 | public function getMaxHeaderCount(): int |
| 162 | { |
| 163 | return $this->maxHeaderCount; |
| 164 | } |
| 165 | |
| 166 | public function getMaxHeaderLineLength(): int |
| 167 | { |
| 168 | return $this->maxHeaderLineLength; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Return a new instance with DoS limits overridden. Passing null |
| 173 | * leaves a limit at its current value. |
| 174 | */ |
| 175 | public function withLimits( |
| 176 | ?int $maxResponseSize = null, |
| 177 | ?int $maxHeaderCount = null, |
| 178 | ?int $maxHeaderLineLength = null, |
| 179 | ): self { |
| 180 | if ($maxResponseSize !== null && $maxResponseSize < 1) { |
| 181 | throw new \InvalidArgumentException('maxResponseSize must be >= 1, got: ' . $maxResponseSize); |
| 182 | } |
| 183 | if ($maxHeaderCount !== null && $maxHeaderCount < 1) { |
| 184 | throw new \InvalidArgumentException('maxHeaderCount must be >= 1, got: ' . $maxHeaderCount); |
| 185 | } |
| 186 | if ($maxHeaderLineLength !== null && $maxHeaderLineLength < 1) { |
| 187 | throw new \InvalidArgumentException('maxHeaderLineLength must be >= 1, got: ' . $maxHeaderLineLength); |
| 188 | } |
| 189 | |
| 190 | return new self( |
| 191 | host: $this->host, |
| 192 | port: $this->port, |
| 193 | socketTimeout: $this->socketTimeout, |
| 194 | streamTimeout: $this->streamTimeout, |
| 195 | virusFoundHeader: $this->virusFoundHeaders[0], |
| 196 | tlsContext: $this->tlsContext, |
| 197 | maxResponseSize: $maxResponseSize ?? $this->maxResponseSize, |
| 198 | maxHeaderCount: $maxHeaderCount ?? $this->maxHeaderCount, |
| 199 | maxHeaderLineLength: $maxHeaderLineLength ?? $this->maxHeaderLineLength, |
| 200 | virusFoundHeaders: $this->virusFoundHeaders, |
| 201 | ); |
| 202 | } |
| 203 | } |