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comparison mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_SSL_VERIFYPEER.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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23 .TH CURLOPT_SSL_VERIFYPEER 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
24 .SH NAME
25 CURLOPT_SSL_VERIFYPEER \- verify the peer's SSL certificate
26 .SH SYNOPSIS
27 #include <curl/curl.h>
28
29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_VERIFYPEER, long verify);
30 .SH DESCRIPTION
31 Pass a long as parameter to enable or disable.
32
33 This option determines whether curl verifies the authenticity of the peer's
34 certificate. A value of 1 means curl verifies; 0 (zero) means it doesn't.
35
36 When negotiating a TLS or SSL connection, the server sends a certificate
37 indicating its identity. Curl verifies whether the certificate is authentic,
38 i.e. that you can trust that the server is who the certificate says it is.
39 This trust is based on a chain of digital signatures, rooted in certification
40 authority (CA) certificates you supply. curl uses a default bundle of CA
41 certificates (the path for that is determined at build time) and you can
42 specify alternate certificates with the \fICURLOPT_CAINFO(3)\fP option or the
43 \fICURLOPT_CAPATH(3)\fP option.
44
45 When \fICURLOPT_SSL_VERIFYPEER(3)\fP is enabled, and the verification fails to
46 prove that the certificate is authentic, the connection fails. When the
47 option is zero, the peer certificate verification succeeds regardless.
48
49 Authenticating the certificate is not enough to be sure about the server. You
50 typically also want to ensure that the server is the server you mean to be
51 talking to. Use \fICURLOPT_SSL_VERIFYHOST(3)\fP for that. The check that the
52 host name in the certificate is valid for the host name you're connecting to
53 is done independently of the \fICURLOPT_SSL_VERIFYPEER(3)\fP option.
54
55 WARNING: disabling verification of the certificate allows bad guys to
56 man-in-the-middle the communication without you knowing it. Disabling
57 verification makes the communication insecure. Just having encryption on a
58 transfer is not enough as you cannot be sure that you are communicating with
59 the correct end-point.
60
61 NOTE: even when this option is disabled, depending on the used TLS backend,
62 curl may still load the certificate file specified in
63 \fICURLOPT_CAINFO(3)\fP. curl default settings in some distributions might use
64 quite a large file as a default setting for \fICURLOPT_CAINFO(3)\fP, so
65 loading the file can be quite expensive, especially when dealing with many
66 connections. Thus, in some situations, you might want to disable verification
67 fully to save resources by setting \fICURLOPT_CAINFO(3)\fP to NULL - but
68 please also consider the warning above!
69 .SH DEFAULT
70 By default, curl assumes a value of 1.
71 .SH PROTOCOLS
72 All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
73 .SH EXAMPLE
74 .nf
75 CURL *curl = curl_easy_init();
76 if(curl) {
77 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
78
79 /* Set the default value: strict certificate check please */
80 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
81
82 curl_easy_perform(curl);
83 }
84 .fi
85 .SH AVAILABILITY
86 If built TLS enabled.
87 .SH RETURN VALUE
88 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
89 .SH "SEE ALSO"
90 .BR CURLOPT_SSL_VERIFYHOST "(3), "
91 .BR CURLOPT_PROXY_SSL_VERIFYPEER "(3), "
92 .BR CURLOPT_PROXY_SSL_VERIFYHOST "(3), "
93 .BR CURLOPT_CAINFO "(3), "