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deps/curl/docs/libcurl/opts/CURLOPT_SSL_VERIFYPEER.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_SSL_VERIFYPEER
+Section: 3
+Source: libcurl
+See-also:
+  - CURLINFO_CAINFO (3)
+  - CURLINFO_CAPATH (3)
+  - CURLOPT_CAINFO (3)
+  - CURLOPT_PROXY_SSL_VERIFYHOST (3)
+  - CURLOPT_PROXY_SSL_VERIFYPEER (3)
+  - CURLOPT_SSL_VERIFYHOST (3)
+---
+
+# NAME
+
+CURLOPT_SSL_VERIFYPEER - verify the peer's SSL certificate
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_VERIFYPEER, long verify);
+~~~
+
+# DESCRIPTION
+
+Pass a long as parameter to enable or disable.
+
+This option determines whether curl verifies the authenticity of the peer's
+certificate. A value of 1 means curl verifies; 0 (zero) means it does not.
+
+When negotiating a TLS or SSL connection, the server sends a certificate
+indicating its identity. Curl verifies whether the certificate is authentic,
+i.e. that you can trust that the server is who the certificate says it is.
+This trust is based on a chain of digital signatures, rooted in certification
+authority (CA) certificates you supply. curl uses a default bundle of CA
+certificates (the path for that is determined at build time) and you can
+specify alternate certificates with the CURLOPT_CAINFO(3) option or the
+CURLOPT_CAPATH(3) option.
+
+When CURLOPT_SSL_VERIFYPEER(3) is enabled, and the verification fails to
+prove that the certificate is signed by a CA, the connection fails.
+
+When this option is disabled (set to zero), the CA certificates are not loaded
+and the peer certificate verification is simply skipped.
+
+Authenticating the certificate is not enough to be sure about the server. You
+typically also want to ensure that the server is the server you mean to be
+talking to. Use CURLOPT_SSL_VERIFYHOST(3) for that. The check that the host
+name in the certificate is valid for the hostname you are connecting to is
+done independently of the CURLOPT_SSL_VERIFYPEER(3) option.
+
+WARNING: disabling verification of the certificate allows bad guys to
+man-in-the-middle the communication without you knowing it. Disabling
+verification makes the communication insecure. Just having encryption on a
+transfer is not enough as you cannot be sure that you are communicating with
+the correct end-point.
+
+When libcurl uses secure protocols it trusts responses and allows for example
+HSTS and Alt-Svc information to be stored and used subsequently. Disabling
+certificate verification can make libcurl trust and use such information from
+malicious servers.
+
+# DEFAULT
+
+1 - enabled
+
+# PROTOCOLS
+
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
+
+    /* Set the default value: strict certificate check please */
+    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
+
+    curl_easy_perform(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+If built TLS enabled.
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.