117 lines
4.3 KiB
Groff
117 lines
4.3 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_PROXY_PINNEDPUBLICKEY 3 "August 22, 2023" "ibcurl 8.3.0" libcurl
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.SH NAME
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CURLOPT_PROXY_PINNEDPUBLICKEY \- pinned public key for https proxy
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_PINNEDPUBLICKEY, char *pinnedpubkey);
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.fi
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.SH DESCRIPTION
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Pass a pointer to a null-terminated string as parameter. The string can be the
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file name of your pinned public key. The file format expected is "PEM" or "DER".
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The string can also be any number of base64 encoded sha256 hashes preceded by
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"sha256//" and separated by ";"
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When negotiating a TLS or SSL connection, the https proxy sends a certificate
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indicating its identity. A public key is extracted from this certificate and
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if it does not exactly match the public key provided to this option, libcurl
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aborts the connection before sending or receiving any data.
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On mismatch, \fICURLE_SSL_PINNEDPUBKEYNOTMATCH\fP is returned.
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The application does not have to keep the string around after setting this
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option.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy:443");
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curl_easy_setopt(curl, CURLOPT_PROXY_PINNEDPUBLICKEY,
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"sha256//YhKJKSzoTt2b5FP18fvpHo7fJYqQCjAa3HWY3tvRMwE=;sha256//t62CeU2tQiqkexU74Gxa2eg7fRbEgoChTociMee9wno=");
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/* Perform the request */
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curl_easy_perform(curl);
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}
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.fi
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.SH PUBLIC KEY EXTRACTION
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If you do not have the https proxy server's public key file you can extract it
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from the https proxy server's certificate.
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.nf
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# retrieve the server's certificate if you do not already have it
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#
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# be sure to examine the certificate to see if it is what you expected
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#
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# Windows-specific:
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# - Use NUL instead of /dev/null.
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# - OpenSSL may wait for input instead of disconnecting. Hit enter.
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# - If you do not have sed, then just copy the certificate into a file:
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# Lines from -----BEGIN CERTIFICATE----- to -----END CERTIFICATE-----.
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#
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openssl s_client -servername www.example.com -connect www.example.com:443 < /dev/null | sed -n "/-----BEGIN/,/-----END/p" > www.example.com.pem
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# extract public key in pem format from certificate
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openssl x509 -in www.example.com.pem -pubkey -noout > www.example.com.pubkey.pem
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# convert public key from pem to der
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openssl asn1parse -noout -inform pem -in www.example.com.pubkey.pem -out www.example.com.pubkey.der
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# sha256 hash and base64 encode der to string for use
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openssl dgst -sha256 -binary www.example.com.pubkey.der | openssl base64
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.fi
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The public key in PEM format contains a header, base64 data and a
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footer:
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.nf
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-----BEGIN PUBLIC KEY-----
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[BASE 64 DATA]
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-----END PUBLIC KEY-----
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.fi
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.SH AVAILABILITY
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PEM/DER support:
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7.52.0: GnuTLS, OpenSSL, mbedTLS, wolfSSL
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sha256 support:
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7.52.0: GnuTLS, OpenSSL, mbedTLS, wolfSSL
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Other SSL backends not supported.
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.SH RETURN VALUE
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Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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.SH "SEE ALSO"
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.BR CURLOPT_PROXY_SSL_VERIFYPEER "(3), "
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.BR CURLOPT_PROXY_SSL_VERIFYHOST "(3), "
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.BR CURLOPT_PROXY_CAINFO "(3), "
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.BR CURLOPT_PROXY_CAPATH "(3), "
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