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121 lines
3.7 KiB
Groff
121 lines
3.7 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_PINNEDPUBLICKEY.md
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.TH CURLOPT_PINNEDPUBLICKEY 3 "2024-06-01" libcurl
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.SH NAME
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CURLOPT_PINNEDPUBLICKEY \- pinned public key
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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_PINNEDPUBLICKEY,
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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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filename of your pinned public key. The file format expected is "PEM" or
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\&"DER". The string can also be any number of base64 encoded sha256 hashes
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preceded by "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
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aborts the connection before sending or receiving any data.
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This option is independent of option \fICURLOPT_SSL_VERIFYPEER(3)\fP. If you turn
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off that option then the peer is still verified by public key.
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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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This option works only with the following TLS backends:
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GnuTLS, OpenSSL, Schannel, Secure Transport, mbedTLS and wolfSSL
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.SH EXAMPLE
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.nf
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int main(void)
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{
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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,
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"sha256//YhKJKSzoTt2b5FP18fvpHo7fJYqQCjAa3HWY3"
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"tvRMwE=;sha256//t62CeU2tQiqkexU74Gxa2eg7fRbEg"
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"oChTociMee9wno=");
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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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}
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.fi
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.SH PUBLIC KEY EXTRACTION
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If you do not have the server\(aqs public key file you can extract it from the
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server\(aqs 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 \\
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< /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 \\
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-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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.IP "PEM/DER support"
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7.39.0: OpenSSL, GnuTLS
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7.43.0: wolfSSL
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7.47.0: mbedTLS
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7.54.1: Secure Transport on macOS 10.7+/iOS 10+
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7.58.1: Schannel
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.IP "sha256 support"
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7.44.0: OpenSSL, GnuTLS and wolfSSL
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7.47.0: mbedTLS
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7.54.1: Secure Transport on macOS 10.7+/iOS 10+
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7.58.1: Schannel
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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_CAINFO (3),
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.BR CURLOPT_CAPATH (3),
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.BR CURLOPT_SSL_VERIFYHOST (3),
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.BR CURLOPT_SSL_VERIFYPEER (3)
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