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Use new default-user-shell option instead of hard-coding bash in nspawn and user-record

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Defaults to /bin/bash, no changes in the default configuration

The fallback shell for non-root users is as-specified,
and the interactive shell for nspawn sessions is started as
  exec(default-user-shell, "-" + basename(default-user-shell), ...)
before falling through to bash and sh
This commit is contained in:
наб 2022-03-24 17:15:39 +01:00 committed by Lennart Poettering
parent 505df87ea8
commit 53350c7bba
4 changed files with 13 additions and 4 deletions
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4
meson.build
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@ -760,6 +760,10 @@ conf.set('TIME_EPOCH', time_epoch)
conf.set('CLOCK_VALID_RANGE_USEC_MAX', get_option('clock-valid-range-usec-max'))
default_user_shell = get_option('default-user-shell')
conf.set_quoted('DEFAULT_USER_SHELL', default_user_shell)
conf.set_quoted('DEFAULT_USER_SHELL_NAME', fs.name(default_user_shell))
foreach tuple : [['system-alloc-uid-min', 'SYS_UID_MIN', 1], # Also see login.defs(5).
['system-uid-max', 'SYS_UID_MAX', 999],
['system-alloc-gid-min', 'SYS_GID_MIN', 1],

2
meson_options.txt
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@ -220,6 +220,8 @@ option('time-epoch', type : 'integer', value : '-1',
description : 'time epoch for time clients')
option('clock-valid-range-usec-max', type : 'integer', value : '473364000000000', # 15 years
description : 'maximum value in microseconds for the difference between RTC and epoch, exceeding which is considered an RTC error')
option('default-user-shell', type : 'string', value : '/bin/bash',
description : 'default interactive shell')
option('system-alloc-uid-min', type : 'integer', value : '-1',
description : 'minimum system UID used when allocating')

9
src/nspawn/nspawn.c
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@ -3550,10 +3550,13 @@ static int inner_child(
/* If we cannot change the directory, we'll end up in /, that is expected. */
(void) chdir(home ?: "/root");
execle("/bin/bash", "-bash", NULL, env_use);
execle("/bin/sh", "-sh", NULL, env_use);
execle(DEFAULT_USER_SHELL, "-" DEFAULT_USER_SHELL_NAME, NULL, env_use);
if (!streq(DEFAULT_USER_SHELL, "/bin/bash"))
execle("/bin/bash", "-bash", NULL, env_use);
if (!streq(DEFAULT_USER_SHELL, "/bin/sh"))
execle("/bin/sh", "-sh", NULL, env_use);
exec_target = "/bin/bash, /bin/sh";
exec_target = DEFAULT_USER_SHELL ", /bin/bash, /bin/sh";
}
return log_error_errno(errno, "execv(%s) failed: %m", exec_target);

2
src/shared/user-record.c
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@ -1747,7 +1747,7 @@ const char *user_record_shell(UserRecord *h) {
return "/bin/sh";
if (user_record_disposition(h) == USER_REGULAR)
return "/bin/bash";
return DEFAULT_USER_SHELL;
return NOLOGIN;
}