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adduser: allow adding to group 0; don't _create_ /etc/shadow,

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only append data if it exists.

function                                             old     new   delta
adduser_main                                         642     667     +25
This commit is contained in:
Denis Vlasenko 2009-01-12 09:20:49 +00:00
parent 319fe129a1
commit f478fde33c
1 changed files with 15 additions and 13 deletions
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28
loginutils/adduser.c
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@ -33,18 +33,17 @@ static void passwd_study(struct passwd *p)
}
/* check for a free uid (and maybe gid) */
while (getpwuid(p->pw_uid) || (!p->pw_gid && getgrgid(p->pw_uid)))
while (getpwuid(p->pw_uid) || (p->pw_gid == (gid_t)-1 && getgrgid(p->pw_uid))) {
p->pw_uid++;
if (p->pw_uid > max)
bb_error_msg_and_die("no free uids left");
}
if (!p->pw_gid) {
/* new gid = uid */
p->pw_gid = p->pw_uid;
if (p->pw_gid == (gid_t)-1) {
p->pw_gid = p->pw_uid; /* new gid = uid */
if (getgrnam(p->pw_name))
bb_error_msg_and_die("group name '%s' is in use", p->pw_name);
}
if (p->pw_uid > max)
bb_error_msg_and_die("no free uids left");
}
static void addgroup_wrapper(struct passwd *p)
@ -90,6 +89,7 @@ int adduser_main(int argc UNUSED_PARAM, char **argv)
struct passwd pw;
const char *usegroup = NULL;
FILE *file;
int fd;
#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
applet_long_options = adduser_longopts;
@ -117,7 +117,7 @@ int adduser_main(int argc UNUSED_PARAM, char **argv)
pw.pw_dir = xasprintf("/home/%s", argv[0]);
}
pw.pw_passwd = (char *)"x";
pw.pw_gid = usegroup ? xgroup2gid(usegroup) : 0; /* exits on failure */
pw.pw_gid = usegroup ? xgroup2gid(usegroup) : -1; /* exits on failure */
/* make sure everything is kosher and setup uid && maybe gid */
passwd_study(&pw);
@ -134,17 +134,19 @@ int adduser_main(int argc UNUSED_PARAM, char **argv)
#if ENABLE_FEATURE_SHADOWPASSWDS
/* add to shadow if necessary */
file = fopen_or_warn(bb_path_shadow_file, "a");
if (file) {
//fseek(file, 0, SEEK_END);
fprintf(file, "%s:!:%u:0:99999:7:::\n",
/* fopen(..., "a"); would create shadow file, which is wrong.
* If shadow file doesn't exist, admin probably does not want it */
fd = open_or_warn(bb_path_shadow_file, O_WRONLY | O_APPEND);
if (fd >= 0) {
char *s = xasprintf("%s:!:%u:0:99999:7:::\n",
pw.pw_name, /* username */
(unsigned)(time(NULL) / 86400) /* sp->sp_lstchg */
/*0,*/ /* sp->sp_min */
/*99999,*/ /* sp->sp_max */
/*7*/ /* sp->sp_warn */
);
fclose(file);
xwrite(fd, s, strlen(s));
close(fd);
}
#endif