diff options
Diffstat (limited to 'docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3')
| -rw-r--r-- | docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3 | 52 |
1 files changed, 43 insertions, 9 deletions
diff --git a/docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3 b/docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3 index 94cad31f..4e673bd4 100644 --- a/docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3 +++ b/docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3 @@ -5,11 +5,11 @@ .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * -.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al. +.\" * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al. .\" * .\" * This software is licensed as described in the file COPYING, which .\" * you should have received as part of this distribution. The terms -.\" * are also available at http://curl.haxx.se/docs/copyright.html. +.\" * are also available at https://curl.haxx.se/docs/copyright.html. .\" * .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell .\" * copies of the Software, and permit persons to whom the Software is @@ -28,23 +28,30 @@ CURLOPT_PINNEDPUBLICKEY \- set pinned public key CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PINNEDPUBLICKEY, char *pinnedpubkey); .SH DESCRIPTION -Pass a pointer to a zero terminated string as parameter. The string should be -the file name of your pinned public key. The format expected is "PEM" or "DER". +Pass a pointer to a zero terminated string as parameter. The string can be the +file name of your pinned public key. The file format expected is "PEM" or "DER". +The string can also be any number of base64 encoded sha256 hashes preceded by +"sha256//" and separated by ";" When negotiating a TLS or SSL connection, the server sends a certificate indicating its identity. A public key is extracted from this certificate and if it does not exactly match the public key provided to this option, curl will abort the connection before sending or receiving any data. + +On mismatch, \fICURLE_SSL_PINNEDPUBKEYNOTMATCH\fP is returned. .SH DEFAULT NULL .SH PROTOCOLS -All TLS based protocols: HTTPS, FTPS, IMAPS, POP3, SMTPS etc. +All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. .SH EXAMPLE .nf CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); curl_easy_setopt(curl, CURLOPT_PINNEDPUBLICKEY, "/etc/publickey.der"); + /* OR + curl_easy_setopt(curl, CURLOPT_PINNEDPUBLICKEY, "sha256//YhKJKSzoTt2b5FP18fvpHo7fJYqQCjAa3HWY3tvRMwE=;sha256//t62CeU2tQiqkexU74Gxa2eg7fRbEgoChTociMee9wno="); + */ /* Perform the request */ curl_easy_perform(curl); @@ -54,9 +61,28 @@ if(curl) { If you do not have the server's public key file you can extract it from the server's certificate. .nf -openssl x509 -in www.test.com.pem -pubkey -noout > www.test.com.pubkey.pem +# retrieve the server's certificate if you don't already have it +# +# be sure to examine the certificate to see if it is what you expected +# +# Windows-specific: +# - Use NUL instead of /dev/null. +# - OpenSSL may wait for input instead of disconnecting. Hit enter. +# - If you don't have sed, then just copy the certificate into a file: +# Lines from -----BEGIN CERTIFICATE----- to -----END CERTIFICATE-----. +# +openssl s_client -servername www.example.com -connect www.example.com:443 < /dev/null | sed -n "/-----BEGIN/,/-----END/p" > www.example.com.pem + +# extract public key in pem format from certificate +openssl x509 -in www.example.com.pem -pubkey -noout > www.example.com.pubkey.pem + +# convert public key from pem to der +openssl asn1parse -noout -inform pem -in www.example.com.pubkey.pem -out www.example.com.pubkey.der + +# sha256 hash and base64 encode der to string for use +openssl dgst -sha256 -binary www.example.com.pubkey.der | openssl base64 .fi -The public key is output in PEM format and contains a header, base64 data and a +The public key in PEM format contains a header, base64 data and a footer: .nf -----BEGIN PUBLIC KEY----- @@ -64,8 +90,16 @@ footer: -----END PUBLIC KEY----- .fi .SH AVAILABILITY -Added in 7.39.0 for OpenSSL, GnuTLS and GSKit. Added in 7.43.0 for -NSS and wolfSSL/CyaSSL. Other SSL backends not supported. +PEM/DER support: + 7.39.0: OpenSSL, GnuTLS and GSKit + 7.43.0: NSS and wolfSSL/CyaSSL + 7.47.0: mbedtls + 7.49.0: PolarSSL +sha256 support: + 7.44.0: OpenSSL, GnuTLS, NSS and wolfSSL/CyaSSL. + 7.47.0: mbedtls + 7.49.0: PolarSSL +Other SSL backends not supported. .SH RETURN VALUE Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space. |