Need help in removing secp521r1 from openssl-1.1.1g and adding TLS_GREASE_BA cipher.

[Matt Caswell]

On 02/07/2021 14:02, vinod mg wrote:
> --> Is there a way I can compile openssl itself to exclude 'secp521r1' 
> and install? The reason I ask is because application I am testing is 
> squid(squid-cache.org <http://squid-cache.org>) for ssl bumping purposes 
> and it has limited configurability.

Only by disabling *all* ec groups (via the "no-ec" configure option) but 
that is no solution at all really. I would not recommend that!

You might try starting squid with the OPENSSL_CONF environment variable 
pointing to a custom OpenSSL config file. Assuming squid doesn't 
suppress loading the config file then you can do the same thing as 
SSL_CTX_set1_groups_list via the "Groups" SSL_CONF setting. See the info 
here on configuring OpenSSL SSL/TLS settings via config file (see the 
section "SSL Configuration Module"):

https://www.openssl.org/docs/man1.1.1/man5/config.html

And see the documentation on "Groups" on this page:

https://www.openssl.org/docs/man1.1.1/man3/SSL_CONF_cmd.html

Matt

> 
> Thanks,
> Vinod
> 
> 
> On Fri, Jul 2, 2021 at 4:32 PM Matt Caswell <matt at openssl.org 
> <mailto:matt at openssl.org>> wrote:
> 
> 
> 
>     On 01/07/2021 07:21, vinod mg wrote:
>      >     1) Supress or a way to remove secp521r1 from the currenlty
>     installed
>      >     openssl.
> 
>     You can specify the list of groups by calling SSL_CTX_set1_groups_list
>     (or SSL_set1_groups_list) from your application. See:
> 
>     https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set1_groups_list.html
>     <https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set1_groups_list.html>
> 
>      >     2) Add the cipher - "0xbaba   TLS_GREASE_BA   GREASE" like we
>     see in
>      >     chrome.
> 
>     This is not a real cipher. It does nothing and is always ignored.
>     OpenSSL does not support sending this value.
> 
>     Matt
> 
> 
>      >
>      >     I am ok with custom install as well, if above cannot be done with
>      >     already installed openssl package. Please share any wiki I can
>      >     follow to impliment the same.
>      >
>      >     ~]# openssl ecparam -list_curves
>      >
>      >     secp224r1 : NIST/SECG curve over a 224 bit prime field
>      >
>      >     secp256k1 : SECG curve over a 256 bit prime field
>      >
>      >     secp384r1 : NIST/SECG curve over a 384 bit prime field
>      >
>      >     /secp521r1 : NIST/SECG curve over a 521 bit prime field/
>      >
>      >     prime256v1: X9.62/SECG curve over a 256 bit prime field
>      >
>      >
>      >     I am using below OS and version-
>      >
>      >     # cat /etc/redhat-release
>      >
>      >     Red Hat Enterprise Linux release 8.3 (Ootpa)
>      >
>      >
>      >     # opensslversion -a
>      >
>      >     OpenSSL 1.1.1g FIPS21 Apr 2020
>      >
>      >     built on: Thu Mar 25 16:46:53 2021 UTC
>      >
>      >     platform: linux-x86_64
>      >
>      >     options:bn(64,64) md2(char) rc4(16x,int) des(int) idea(int)
>      >     blowfish(ptr)
>      >
>      >     compiler: gcc -fPIC -pthread -m64 -Wa,--noexecstack -Wall -O3
>     -O2 -g
>      >     -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
>      >     -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong
>      >     -grecord-gcc-switches
>     -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
>      >     -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
>      >     -fasynchronous-unwind-tables -fstack-clash-protection
>      >     -fcf-protection -Wa,--noexecstack
>      >     -Wa,--generate-missing-build-notes=yes
>      >     -specs=/usr/lib/rpm/redhat/redhat-hardened-ld
>     -DOPENSSL_USE_NODELETE
>      >     -DL_ENDIAN -DOPENSSL_PIC -DOPENSSL_CPUID_OBJ -DOPENSSL_IA32_SSE2
>      >     -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5
>     -DOPENSSL_BN_ASM_GF2m
>      >     -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DKECCAK1600_ASM -DRC4_ASM
>      >     -DMD5_ASM -DAESNI_ASM -DVPAES_ASM -DGHASH_ASM -DECP_NISTZ256_ASM
>      >     -DX25519_ASM -DPOLY1305_ASM -DZLIB -DNDEBUG -DPURIFY
>      >     -DDEVRANDOM="\"/dev/urandom\""
>      >   
>       -DSYSTEM_CIPHERS_FILE="/etc/crypto-policies/back-ends/openssl.config"
>      >
>      >     OPENSSLDIR: "/etc/pki/tls"
>      >
>      >     ENGINESDIR: "/usr/lib64/engines-1.1"
>      >
>      >     Seeding source: os-specific
>      >
>      >     engines:rdrand dynamic
>      >
>      >
>      >     Really appriciate your time and help, thanks in advance.
>      >
>      >     Thanks,
>      >     Vinod
>      >
>