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SSL: implement public key pinning

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Option --pinnedpubkey takes a path to a public key in DER format and
only connect if it matches (currently only implemented with OpenSSL).

Provides CURLOPT_PINNEDPUBLICKEY for curl_easy_setopt().

Extract a public RSA key from a website like so:
openssl s_client -connect google.com:443 2>&1 < /dev/null | \
sed -n '/-----BEGIN/,/-----END/p' | openssl x509 -noout -pubkey \
| openssl rsa -pubin -outform DER > google.com.der
This commit is contained in:
moparisthebest 2014-09-30 22:31:17 -04:00 • committed by Daniel Stenberg
parent d1b56d0043
commit 93e450793c
20 changed files with 311 additions and 2 deletions
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15
docs/curl.1
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@ -530,6 +530,19 @@ OpenSSL-powered curl to make SSL-connections much more efficiently than using
If this option is set, the default capath value will be ignored, and if it is
used several times, the last one will be used.
.IP "--pinnedpubkey <pinned public key>"
(SSL) Tells curl to use the specified public key file to verify the peer. The
file must contain a single public key in DER format.
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.
This is currently only implemented in the OpenSSL backend, with more backends
expected to follow shortly.
If this option is used several times, the last one will be used.
.IP "-f, --fail"
(HTTP) Fail silently (no output at all) on server errors. This is mostly done
to better enable scripts etc to better deal with failed attempts. In
@ -2180,6 +2193,8 @@ unable to parse FTP file list
FTP chunk callback reported error
.IP 89
No connection available, the session will be queued
.IP 90
SSL public key does not matched pinned public key
.IP XX
More error codes will appear here in future releases. The existing ones
are meant to never change.

51
docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3 Normal file
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@ -0,0 +1,51 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2014, 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.
.\" *
.\" * 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
.\" * furnished to do so, under the terms of the COPYING file.
.\" *
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
.\" * KIND, either express or implied.
.\" *
.\" **************************************************************************
.\"
.TH CURLOPT_PINNEDPUBLICKEY 3 "27 Aug 2014" "libcurl 7.38.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_PINNEDPUBLICKEY \- set pinned public key
.SH SYNOPSIS
#include <curl/curl.h>
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 "DER".
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.
This is currently only implemented in the OpenSSL backend, with more backends
expected to follow shortly.
.SH DEFAULT
NULL
.SH PROTOCOLS
All TLS based protocols: HTTPS, FTPS, IMAPS, POP3, SMTPS etc.
.SH EXAMPLE
TODO
.SH AVAILABILITY
If built TLS enabled.
.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.

4
docs/libcurl/symbols-in-versions
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@ -74,12 +74,12 @@ CURLE_FTP_WEIRD_USER_REPLY 7.1 7.17.0
CURLE_FTP_WRITE_ERROR 7.1 7.17.0
CURLE_FUNCTION_NOT_FOUND 7.1
CURLE_GOT_NOTHING 7.9.1
CURLE_HTTP2 7.38.0
CURLE_HTTP_NOT_FOUND 7.1
CURLE_HTTP_PORT_FAILED 7.3 7.12.0
CURLE_HTTP_POST_ERROR 7.1
CURLE_HTTP_RANGE_ERROR 7.1 7.17.0
CURLE_HTTP_RETURNED_ERROR 7.10.3
CURLE_HTTP2 7.38.0
CURLE_INTERFACE_FAILED 7.12.0
CURLE_LDAP_CANNOT_BIND 7.1
CURLE_LDAP_INVALID_URL 7.10.8
@ -120,6 +120,7 @@ CURLE_SSL_ENGINE_NOTFOUND 7.9.3
CURLE_SSL_ENGINE_SETFAILED 7.9.3
CURLE_SSL_ISSUER_ERROR 7.19.0
CURLE_SSL_PEER_CERTIFICATE 7.8 7.17.1
CURLE_SSL_PINNEDPUBKEYNOTMATCH 7.39.0
CURLE_SSL_SHUTDOWN_FAILED 7.16.1
CURLE_TELNET_OPTION_SYNTAX 7.7
CURLE_TFTP_DISKFULL 7.15.0 7.17.0
@ -429,6 +430,7 @@ CURLOPT_PASSWDDATA 7.4.2 7.11.1 7.15.5
CURLOPT_PASSWDFUNCTION 7.4.2 7.11.1 7.15.5
CURLOPT_PASSWORD 7.19.1
CURLOPT_PASV_HOST 7.12.1 7.16.0 7.15.5
CURLOPT_PINNEDPUBLICKEY 7.39.0
CURLOPT_PORT 7.1
CURLOPT_POST 7.1
CURLOPT_POST301 7.17.1 7.19.1