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deb9462ff2
Remove support for, references to and use of "cyaSSL" from the source and docs. wolfSSL is the current name and there's no point in keeping references to ancient history. Assisted-by: Daniel Gustafsson Closes #3903
129 lines
4.4 KiB
Groff
129 lines
4.4 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) 1998 - 2019, 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.haxx.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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.\" **************************************************************************
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.\"
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.TH CURLOPT_PINNEDPUBLICKEY 3 "27 Aug 2014" "libcurl 7.38.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_PINNEDPUBLICKEY \- set pinned public key
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PINNEDPUBLICKEY, char *pinnedpubkey);
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.SH DESCRIPTION
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Pass a pointer to a zero 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 server 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, curl will
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abort 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_PINNEDPUBLICKEY, "/etc/publickey.der");
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/* OR
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curl_easy_setopt(curl, CURLOPT_PINNEDPUBLICKEY, "sha256//YhKJKSzoTt2b5FP18fvpHo7fJYqQCjAa3HWY3tvRMwE=;sha256//t62CeU2tQiqkexU74Gxa2eg7fRbEgoChTociMee9wno=");
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*/
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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 server's public key file you can extract it from the
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server's certificate.
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.nf
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# retrieve the server's certificate if you don't 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 don't 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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7.39.0: OpenSSL, GnuTLS
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7.39.0-7.48.0,7.58.1+: GSKit
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7.43.0: NSS and wolfSSL
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7.47.0: mbedtls
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7.54.1: SecureTransport on macOS 10.7+/iOS 10+
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7.58.1: SChannel
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sha256 support:
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7.44.0: OpenSSL, GnuTLS, NSS and wolfSSL
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7.47.0: mbedtls
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7.54.1: SecureTransport on macOS 10.7+/iOS 10+
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7.58.1: SChannel Windows XP SP3+
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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_SSL_VERIFYPEER "(3), "
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.BR CURLOPT_SSL_VERIFYHOST "(3), "
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.BR CURLOPT_CAINFO "(3), "
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.BR CURLOPT_CAPATH "(3), "
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