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openssh: remove RRECOMMENDS to rng-tools for sshd package

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It appears that rngd is not needed as of linux-5.6 and later[1]
and should not be installed by default since the purpose of rngd
is to provide additional trusted sources of entropy.

We did some testing on real hardware, the result seems to support that
we no longer need rngd by default on kernel v5.6 and later.

Testing result as below:

1. observing the crng init stage.
 the "random: crng init done" always available before fs being mounted.

2. generating random number without rngd.
 testing command: dd if=/dev/random of=/dev/null status=progress
   on Marvell CN96xx RDB board, speed almost 20.4 MB/s without block
   on NXP i.mx6q board, speed almost 31.9 MB/s without block
   on qemu x86-64, speed almost 2.6MB/s without block

3. using rngtest command without rngd
 testing command: rngtest -c 1000 </dev/random
   on Marvell CN96xx RDB board:
      rngtest: input channel speed: (min=4.340; avg=135.364; max=146.719)Mibits/s
      rngtest: FIPS tests speed: (min=8.197; avg=69.020; max=72.800)Mibits/s
      rngtest: Program run time: 418771 microseconds

   on NXP i.mx6q board:
      rngtest: input channel speed: (min=96.820; avg=326.769; max=340.598)Mibits/s
      rngtest: FIPS tests speed: (min=15.090; avg=37.543; max=40.324)Mibits/s
      rngtest: Program run time: 570229 microseconds

   on qemu x86-64:
      rngtest: input channel speed: (min=37.769; avg=101.136; max=136.239)Mibits/s
      rngtest: FIPS tests speed: (min=10.288; avg=30.682; max=40.155)Mibits/s
      rngtest: Program run time: 836800 microseconds

4. observing sshd service.
  using "systemctl disable rng-tools" disable service and reboot system.
  system boot up normal, sshd service also start in normal time without
  block.

Reference:
[1] 30c08efec8

(From OE-Core rev: 2ed579aa28194cf671e5d4f4c61dc38d05de4b0c)

Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit 868dfb46d96a27ec9041cb902fb769330277257d)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Xiangyu Chen
2022-12-19 13:06:59 +08:00
committed by Richard Purdie
parent 11555b5d2b
commit 9cd4e36dd5
1 changed files with 1 additions and 9 deletions
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10
meta/recipes-connectivity/openssh/openssh_8.9p1.bb
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@@ -54,15 +54,12 @@ SYSTEMD_SERVICE:${PN}-sshd = "sshd.socket"
inherit autotools-brokensep ptest
PACKAGECONFIG ??= "rng-tools"
PACKAGECONFIG ??= ""
PACKAGECONFIG[kerberos] = "--with-kerberos5,--without-kerberos5,krb5"
PACKAGECONFIG[ldns] = "--with-ldns,--without-ldns,ldns"
PACKAGECONFIG[libedit] = "--with-libedit,--without-libedit,libedit"
PACKAGECONFIG[manpages] = "--with-mantype=man,--with-mantype=cat"
# Add RRECOMMENDS to rng-tools for sshd package
PACKAGECONFIG[rng-tools] = ""
EXTRA_AUTORECONF += "--exclude=aclocal"
# login path is hardcoded in sshd
@@ -162,15 +159,10 @@ FILES:${PN}-keygen = "${bindir}/ssh-keygen"
RDEPENDS:${PN} += "${PN}-scp ${PN}-ssh ${PN}-sshd ${PN}-keygen ${PN}-sftp-server"
RDEPENDS:${PN}-sshd += "${PN}-keygen ${@bb.utils.contains('DISTRO_FEATURES', 'pam', 'pam-plugin-keyinit pam-plugin-loginuid', '', d)}"
RRECOMMENDS:${PN}-sshd:append:class-target = "\
${@bb.utils.filter('PACKAGECONFIG', 'rng-tools', d)} \
"
# break dependency on base package for -dev package
# otherwise SDK fails to build as the main openssh and dropbear packages
# conflict with each other
RDEPENDS:${PN}-dev = ""
# gdb would make attach-ptrace test pass rather than skip but not worth the build dependencies
RDEPENDS:${PN}-ptest += "${PN}-sftp ${PN}-misc ${PN}-sftp-server make sed sudo coreutils"