quickjs-tart

quickjs-based runtime for wallet-core logic
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CURLOPT_DOH_SSL_VERIFYPEER.md (3113B)

      1 ---
      2 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
      3 SPDX-License-Identifier: curl
      4 Title: CURLOPT_DOH_SSL_VERIFYPEER
      5 Section: 3
      6 Source: libcurl
      7 See-also:
      8   - CURLOPT_CAINFO (3)
      9   - CURLOPT_CAPATH (3)
     10   - CURLOPT_DOH_SSL_VERIFYHOST (3)
     11   - CURLOPT_PROXY_SSL_VERIFYHOST (3)
     12   - CURLOPT_PROXY_SSL_VERIFYPEER (3)
     13   - CURLOPT_SSL_VERIFYHOST (3)
     14   - CURLOPT_SSL_VERIFYPEER (3)
     15 Protocol:
     16   - TLS
     17 TLS-backend:
     18   - All
     19 Added-in: 7.76.0
     20 ---
     21 
     22 # NAME
     23 
     24 CURLOPT_DOH_SSL_VERIFYPEER - verify the DoH SSL certificate
     25 
     26 # SYNOPSIS
     27 
     28 ~~~c
     29 #include <curl/curl.h>
     30 
     31 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_SSL_VERIFYPEER,
     32                           long verify);
     33 ~~~
     34 
     35 # DESCRIPTION
     36 
     37 Pass a long as parameter set to 1L to enable or 0L to disable.
     38 
     39 This option tells curl to verify the authenticity of the DoH (DNS-over-HTTPS)
     40 server's certificate. A value of 1 means curl verifies; 0 (zero) means it
     41 does not.
     42 
     43 This option is the DoH equivalent of CURLOPT_SSL_VERIFYPEER(3) and
     44 only affects requests to the DoH server.
     45 
     46 When negotiating a TLS or SSL connection, the server sends a certificate
     47 indicating its identity. curl verifies whether the certificate is authentic,
     48 i.e. that you can trust that the server is who the certificate says it is.
     49 This trust is based on a chain of digital signatures, rooted in certification
     50 authority (CA) certificates you supply. curl uses a default bundle of CA
     51 certificates (the path for that is determined at build time) and you can
     52 specify alternate certificates with the CURLOPT_CAINFO(3) option or the
     53 CURLOPT_CAPATH(3) option.
     54 
     55 When CURLOPT_DOH_SSL_VERIFYPEER(3) is enabled, and the verification fails to
     56 prove that the certificate is authentic, the connection fails. When the option
     57 is zero, the peer certificate verification succeeds regardless.
     58 
     59 Authenticating the certificate is not enough to be sure about the server. You
     60 typically also want to ensure that the server is the server you mean to be
     61 talking to. Use CURLOPT_DOH_SSL_VERIFYHOST(3) for that. The check that the
     62 hostname in the certificate is valid for the hostname you are connecting to
     63 is done independently of the CURLOPT_DOH_SSL_VERIFYPEER(3) option.
     64 
     65 WARNING: disabling verification of the certificate allows bad guys to
     66 man-in-the-middle the communication without you knowing it. Disabling
     67 verification makes the communication insecure. Just having encryption on a
     68 transfer is not enough as you cannot be sure that you are communicating with
     69 the correct end-point.
     70 
     71 # DEFAULT
     72 
     73 1
     74 
     75 # %PROTOCOLS%
     76 
     77 # EXAMPLE
     78 
     79 ~~~c
     80 int main(void)
     81 {
     82   CURL *curl = curl_easy_init();
     83   if(curl) {
     84     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
     85 
     86     curl_easy_setopt(curl, CURLOPT_DOH_URL,
     87                      "https://cloudflare-dns.com/dns-query");
     88 
     89     /* Disable certificate verification of the DoH server */
     90     curl_easy_setopt(curl, CURLOPT_DOH_SSL_VERIFYPEER, 0L);
     91 
     92     curl_easy_perform(curl);
     93   }
     94 }
     95 ~~~
     96 
     97 # %AVAILABILITY%
     98 
     99 # RETURN VALUE
    100 
    101 curl_easy_setopt(3) returns a CURLcode indicating success or error.
    102 
    103 CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
    104 libcurl-errors(3).