How to fix curl: (35) Cannot communicate securely with peer: no common encryption algorithm(s)

Question

I am trying to access and download some .torrent files from https://torrage.com using php curl. But nothing happens , curl_error($ch) gives

$ch = curl_init ('https://torrage.com/torrent/640FE84C613C17F663551D218689A64E8AEBEABE.torrent');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0');
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_VERBOSE,true);
$data = curl_exec($ch);
$error = curl_error($ch);
curl_close ($ch);
echo $error;

this gives.

Cannot communicate securely with peer: no common encryption algorithm(s).

If I try from shell like this

[root@prod1 yum.repos.d]# curl -I https://torrage.com
curl: (35) Cannot communicate securely with peer: no common encryption algorithm(s).

in verbose mode

[root@prod1 yum.repos.d]# curl -v https://torrage.com
* Rebuilt URL to: https://torrage.com/
*   Trying 81.17.30.48...
* Connected to torrage.com (81.17.30.48) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* NSS error -12286 (SSL_ERROR_NO_CYPHER_OVERLAP)
* Cannot communicate securely with peer: no common encryption algorithm(s).
* Closing connection 0
curl: (35) Cannot communicate securely with peer: no common encryption algorithm(s).

system info centos 7. x86_64

[root@prod1 yum.repos.d]# uname -a
Linux prod1.localdomain 3.10.0-229.4.2.el7.x86_64 #1 SMP Wed May 13 10:06:09 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

curl version

[root@prod1 yum.repos.d]# curl -V
curl 7.29.0 (x86_64-redhat-linux-gnu)

openssl , already patched.

[root@prod1 yum.repos.d]# openssl version -a
OpenSSL 1.0.1e-fips 11 Feb 2013
built on: Mon Jun 15 18:39:20 UTC 2015
platform: linux-x86_64
options:  bn(64,64) md2(int) rc4(16x,int) des(idx,cisc,16,int) idea(int) blowfish(idx)
compiler: gcc -fPIC -DOPENSSL_PIC -DZLIB -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DKRB5_MIT -m64 -DL_ENDIAN -DTERMIO -Wall -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches   -m64 -mtune=generic -Wa,--noexecstack -DPURIFY -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM
OPENSSLDIR: "/etc/pki/tls"
engines:  dynamic

verifying openssl patched or not.

[root@prod1 yum.repos.d]# rpm -q --changelog openssl | grep CVE-2014-0224
- fix CVE-2014-0224 fix that broke EAP-FAST session resumption support
- fix CVE-2014-0224 - SSL/TLS MITM vulnerability

---

What i have tried :

1) i have tried using HTTP insted of HTTPS, but the site forces to use HTTPS. e.g.

[root@prod1 yum.repos.d]# curl -I http://torrage.com
HTTP/1.1 301 Moved Permanently
Server: nginx/1.9.0
Date: Mon, 29 Jun 2015 04:13:17 GMT
Content-Type: text/html
Content-Length: 184
Connection: keep-alive
Location: https://torrage.com/

2) updating ca-bundle.crt

cp /etc/pki/tls/certs/ca-bundle.crt /root/backup/
curl http://curl.haxx.se/ca/cacert.pem -o /etc/pki/tls/certs/ca-bundle.crt

3) Updating Curl to latest version 7.43.0

nano /etc/yum.repos.d/city-fan-for-curl.repo

with this repo.

[CityFanforCurl]
name=City Fan Repo
baseurl=http://www.city-fan.org/ftp/contrib/yum-repo/rhel7/x86_64/
enabled=0
gpgcheck=0

and then doing

yum update curl --enablerepo=CityFanforCurl

then verifying curl version

[root@prod1 yum.repos.d]# curl -V
curl 7.43.0 (x86_64-redhat-linux-gnu) libcurl/7.43.0 NSS/3.18 Basic ECC zlib/1.2.7 libidn/1.28 libssh2/1.6.0
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: AsynchDNS IDN IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz UnixSockets Metalink

4) i have tried this to check whether my curl is outdated or not.

reference: https://unix.stackexchange.com/questions/162816/disable-sslv3-in-curl

[root@prod1 yum.repos.d]# curl -1IsS --ciphers ecdhe_ecdsa_aes_128_sha https://sslspdy.com
HTTP/1.1 200 OK
Server: nginx centminmod
Content-Type: text/html; charset=utf-8
Connection: close
Vary: Accept-Encoding
Strict-Transport-Security: max-age=31536000; includeSubdomains
Date: Mon, 12 Jan 1970 23:00:11 GMT
X-Page-Speed: ngx_pagespeed
Cache-Control: max-age=0, no-cache

---

How can i fix the issue ? and download files from Torrage.com using PHP Curl ?

*I cant use file_get_contents as i am using curl_multi for simultaneous downloads.

---

Update 1:

As suggested by steffen-ullrich

[root@prod1 randoadmin]# curl --ciphers ecdhe_rsa_aes_128_gcm_sha_256 -I https://torrage.com
HTTP/1.1 200 OK
Server: nginx/1.9.0
Date: Mon, 29 Jun 2015 05:54:17 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Expires: Mon, 26 Jul 1997 05:00:00 GMT
Last-Modified: Mon, 29 Jun 2015 05:50:40 GMT
Cache-Control: no-store, no-cache, must-revalidate
Cache-Control: post-check=0, pre-check=0
Pragma: no-cache
Vary: Accept-Encoding, Accept-Encoding
Strict-Transport-Security: max-age=31536000
X-Frame-Options: DENY
X-Content-Type-Options: nosniff

but thats with shell how can i implement it with PHP-curl ?

Update 2:

i have modified code and defined cipher to use while using curl like this.

$ch = curl_init ('https://torrage.com/torrent/640FE84C613C17F663551D218689A64E8AEBEABE.torrent');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0');
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_SSL_CIPHER_LIST, 'ecdhe_rsa_aes_128_gcm_sha_256');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_VERBOSE,true);
$data = curl_exec($ch);
$error = curl_error($ch);
curl_close ($ch);
echo $error;
echo $data ;

Its working great. Issue solved many thanks to steffen-ullrich .

Answer 1

The server supports only ECC ciphers (ECDHE-*). The version of curl is built with the NSS library on Redhat/CentOS. There is a bug report that Redhat/CentOS overrides the curl settings and disables ECC ciphers by default. Because there are thus no ECC ciphers offered by the client but only ECC ciphers are supported by the server the connection will fail.

You might try to explicitly give the cipher, i.e.

curl --ciphers ecdhe_rsa_aes_128_gcm_sha_256 ...

Note that upgrading OpenSSL would not help because curl is not built with the OpenSSL backend. Also it does not help to disable certificate validation (bad idea anyway) or to change the root CA's since the problem is not related to certificate validation at all.

Trying to explicitly give the cipher with --ciphers ecdhe_ecdsa_aes_128_sha as the cipher to solve the problem goes into the right direction but will not help in this case, because this is not one of the ciphers supported by the servers. The server supports only various ECDHE-RSA-* ciphers but not ECDHE-ECDSA-* ciphers. See SSLLabs for details.