CURLOPT_PROXY_SSL_OPTIONS(3)

1CURLOPT_PROXY_SSL_OPTIONS(3)curl_easy_setopt optionsCURLOPT_PROXY_SSL_OPTIONS(3)
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NAME

6       CURLOPT_PROXY_SSL_OPTIONS - HTTPS proxy SSL behavior options
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SYNOPSIS

9       #include <curl/curl.h>
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11       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_OPTIONS,
12                                 long bitmask);
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DESCRIPTION

15       Pass  a  long  with a bitmask to tell libcurl about specific SSL behav‐
16       iors. Available bits:
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18       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.
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28       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)
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35       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)
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42       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)
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50       CURLSSLOPT_AUTO_CLIENT_CERT
51              Tell libcurl to automatically locate and use a  client  certifi‐
52              cate  for authentication, when requested by the server. This op‐
53              tion is only supported for Schannel (the native Windows SSL  li‐
54              brary). Prior to 7.77.0 this was the default behavior in libcurl
55              with Schannel. Since the server can request any certificate that
56              supports  client  authentication  in the OS certificate store it
57              could be a privacy violation and unexpected.  (Added in 7.77.0)
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DEFAULT

60       0
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PROTOCOLS

63       All TLS-based protocols
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EXAMPLE

66       CURL *curl = curl_easy_init();
67       if(curl) {
68         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
69         curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy");
70         /* weaken TLS only for use with silly proxies */
71         curl_easy_setopt(curl, CURLOPT_PROXY_SSL_OPTIONS, CURLSSLOPT_ALLOW_BEAST |
72                          CURLSSLOPT_NO_REVOKE);
73         ret = curl_easy_perform(curl);
74         curl_easy_cleanup(curl);
75       }
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AVAILABILITY

78       Added in 7.52.0
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RETURN VALUE

81       Returns CURLE_OK if the option is supported,  and  CURLE_UNKNOWN_OPTION
82       if not.
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