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Make the sp_lstchg shadow field reproducible.

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The third field in the /etc/shadow file (sp_lstchg) contains the date of
the last password change expressed as the number of days since Jan 1, 1970.
As this is a relative time, creating a user today will result in:

   username:17238:0:99999:7:::

whilst creating the same user tomorrow will result in:

    username:17239:0:99999:7:::

This has an impact for the Reproducible Builds[0] project where we aim to
be independent of as many elements the build environment as possible,
including the current date.

This patch changes the behaviour to use the SOURCE_DATE_EPOCH[1]
environment variable (instead of Jan 1, 1970) if valid.

 [0] https://reproducible-builds.org/
 [1] https://reproducible-builds.org/specs/source-date-epoch/

Signed-off-by: Chris Lamb <lamby@debian.org>
This commit is contained in:
Chris Lamb
2017-03-15 10:36:21 +00:00
committed by Chris Lamb
parent 2f36da5201
commit cb610d54b4
8 changed files with 100 additions and 7 deletions
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4
src/usermod.c
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@ -641,7 +641,7 @@ static void new_spent (struct spwd *spent)
spent->sp_pwdp = new_pw_passwd (spent->sp_pwdp);
if (pflg) {
spent->sp_lstchg = (long) time ((time_t *) 0) / SCALE;
spent->sp_lstchg = (long) gettime () / SCALE;
if (0 == spent->sp_lstchg) {
/* Better disable aging than requiring a password
* change. */
@ -1673,7 +1673,7 @@ static void usr_update (void)
spent.sp_pwdp = xstrdup (pwent.pw_passwd);
pwent.pw_passwd = xstrdup (SHADOW_PASSWD_STRING);
spent.sp_lstchg = (long) time ((time_t *) 0) / SCALE;
spent.sp_lstchg = (long) gettime () / SCALE;
if (0 == spent.sp_lstchg) {
/* Better disable aging than
* requiring a password change */