1CURLOPT_PROXY_SSL_OPTIONS(3) libcurl CURLOPT_PROXY_SSL_OPTIONS(3)
2
6 CURLOPT_PROXY_SSL_OPTIONS - HTTPS proxy SSL behavior options
7
9 #include <curl/curl.h>
10 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_OPTIONS,
12 long bitmask);
13
15 Pass a long with a bitmask to tell libcurl about specific SSL behav‐
16 iors. Available bits:
17 CURLSSLOPT_ALLOW_BEAST
19 Tells libcurl to not attempt to use any workarounds for a secu‐
20 rity flaw in the SSL3 and TLS1.0 protocols. If this option is
21 not used or this bit is set to 0, the SSL layer libcurl uses may
22 use a work-around for this flaw although it might cause interop‐
23 erability problems with some (older) SSL implementations. WARN‐
24 ING: avoiding this work-around lessens the security, and by set‐
25 ting this option to 1 you ask for exactly that. This option is
26 only supported for Secure Transport, NSS and OpenSSL.
27 CURLSSLOPT_NO_REVOKE
29 Tells libcurl to disable certificate revocation checks for those
30 SSL backends where such behavior is present. This option is only
31 supported for Schannel (the native Windows SSL library), with an
32 exception in the case of Windows' Untrusted Publishers block
33 list which it seems cannot be bypassed. (Added in 7.44.0)
34 CURLSSLOPT_NO_PARTIALCHAIN
36 Tells libcurl to not accept "partial" certificate chains, which
37 it otherwise does by default. This option is only supported for
38 OpenSSL and will fail the certificate verification if the chain
39 ends with an intermediate certificate and not with a root cert.
40 (Added in 7.68.0)
41 CURLSSLOPT_REVOKE_BEST_EFFORT
43 Tells libcurl to ignore certificate revocation checks in case of
44 missing or offline distribution points for those SSL backends
45 where such behavior is present. This option is only supported
46 for Schannel (the native Windows SSL library). If combined with
47 CURLSSLOPT_NO_REVOKE, the latter takes precedence. (Added in
48 7.70.0)
49 CURLSSLOPT_NATIVE_CA
51 Tell libcurl to use the operating system's native CA store for
52 certificate verification. Works only on Windows when built to
53 use OpenSSL. If you set this option and also set a CA certifi‐
54 cate file or directory then during verification those certifi‐
55 cates are searched in addition to the native CA store. (Added
56 in 7.71.0)
57 CURLSSLOPT_AUTO_CLIENT_CERT
59 Tell libcurl to automatically locate and use a client certifi‐
60 cate for authentication, when requested by the server. This op‐
61 tion is only supported for Schannel (the native Windows SSL li‐
62 brary). Prior to 7.77.0 this was the default behavior in libcurl
63 with Schannel. Since the server can request any certificate that
64 supports client authentication in the OS certificate store it
65 could be a privacy violation and unexpected. (Added in 7.77.0)
66
68 0
69
71 All TLS-based protocols
72
74 CURL *curl = curl_easy_init();
75 if(curl) {
76 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
77 curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy");
78 /* weaken TLS only for use with silly proxies */
79 curl_easy_setopt(curl, CURLOPT_PROXY_SSL_OPTIONS, CURLSSLOPT_ALLOW_BEAST |
80 CURLSSLOPT_NO_REVOKE);
81 ret = curl_easy_perform(curl);
82 curl_easy_cleanup(curl);
83 }
84
86 Added in 7.52.0
87
89 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
90 if not.
91
93 CURLOPT_PROXY_SSLVERSION(3), CURLOPT_PROXY_SSL_CIPHER_LIST(3), CUR‐
94 LOPT_SSLVERSION(3), CURLOPT_SSL_CIPHER_LIST(3),
95ibcurl 8.2.1 April 26, 2023 CURLOPT_PROXY_SSL_OPTIONS(3)