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comparison mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_PROXY_PINNEDPUBLICKEY.3 @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
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23 .TH CURLOPT_PROXY_PINNEDPUBLICKEY 3 "24 Nov 2016" "libcurl 7.52.0" "curl_easy_setopt options"
24 .SH NAME
25 CURLOPT_PROXY_PINNEDPUBLICKEY \- set pinned public key for https proxy
26 .SH SYNOPSIS
27 #include <curl/curl.h>
28
29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_PINNEDPUBLICKEY, char *pinnedpubkey);
30 .SH DESCRIPTION
31 Pass a pointer to a zero terminated string as parameter. The string can be the
32 file name of your pinned public key. The file format expected is "PEM" or "DER".
33 The string can also be any number of base64 encoded sha256 hashes preceded by
34 "sha256//" and separated by ";"
35
36 When negotiating a TLS or SSL connection, the https proxy sends a certificate
37 indicating its identity. A public key is extracted from this certificate and
38 if it does not exactly match the public key provided to this option, curl will
39 abort the connection before sending or receiving any data.
40
41 On mismatch, \fICURLE_SSL_PINNEDPUBKEYNOTMATCH\fP is returned.
42
43 The application does not have to keep the string around after setting this
44 option.
45 .SH DEFAULT
46 NULL
47 .SH PROTOCOLS
48 All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
49 .SH EXAMPLE
50 .nf
51 CURL *curl = curl_easy_init();
52 if(curl) {
53 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
54 curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy:443");
55 curl_easy_setopt(curl, CURLOPT_PROXY_PINNEDPUBLICKEY,
56 "sha256//YhKJKSzoTt2b5FP18fvpHo7fJYqQCjAa3HWY3tvRMwE=;sha256//t62CeU2tQiqkexU74Gxa2eg7fRbEgoChTociMee9wno=");
57
58 /* Perform the request */
59 curl_easy_perform(curl);
60 }
61 .fi
62 .SH PUBLIC KEY EXTRACTION
63 If you do not have the https proxy server's public key file you can extract it
64 from the https proxy server's certificate.
65 .nf
66 # retrieve the server's certificate if you don't already have it
67 #
68 # be sure to examine the certificate to see if it is what you expected
69 #
70 # Windows-specific:
71 # - Use NUL instead of /dev/null.
72 # - OpenSSL may wait for input instead of disconnecting. Hit enter.
73 # - If you don't have sed, then just copy the certificate into a file:
74 # Lines from -----BEGIN CERTIFICATE----- to -----END CERTIFICATE-----.
75 #
76 openssl s_client -servername www.example.com -connect www.example.com:443 < /dev/null | sed -n "/-----BEGIN/,/-----END/p" > www.example.com.pem
77
78 # extract public key in pem format from certificate
79 openssl x509 -in www.example.com.pem -pubkey -noout > www.example.com.pubkey.pem
80
81 # convert public key from pem to der
82 openssl asn1parse -noout -inform pem -in www.example.com.pubkey.pem -out www.example.com.pubkey.der
83
84 # sha256 hash and base64 encode der to string for use
85 openssl dgst -sha256 -binary www.example.com.pubkey.der | openssl base64
86 .fi
87 The public key in PEM format contains a header, base64 data and a
88 footer:
89 .nf
90 -----BEGIN PUBLIC KEY-----
91 [BASE 64 DATA]
92 -----END PUBLIC KEY-----
93 .fi
94 .SH AVAILABILITY
95 PEM/DER support:
96
97 7.52.0: GSKit, GnuTLS, NSS, OpenSSL, mbedtls, wolfSSL
98
99 sha256 support:
100
101 7.52.0: GnuTLS, NSS, OpenSSL, mbedtls, wolfSSL
102
103 Other SSL backends not supported.
104 .SH RETURN VALUE
105 Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
106 CURLE_OUT_OF_MEMORY if there was insufficient heap space.
107 .SH "SEE ALSO"
108 .BR CURLOPT_PROXY_SSL_VERIFYPEER "(3), "
109 .BR CURLOPT_PROXY_SSL_VERIFYHOST "(3), "
110 .BR CURLOPT_PROXY_CAINFO "(3), "
111 .BR CURLOPT_PROXY_CAPATH "(3), "