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deluser: add optional support for removing users from groups

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(by Tito <farmatito@tiscali.it>)
This commit is contained in:
Denis Vlasenko 2007-04-15 08:43:23 +00:00
parent 91de7c0328
commit be1a9d4237
4 changed files with 110 additions and 58 deletions
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5
include/usage.h
View File

@ -571,9 +571,10 @@
"Deallocate unused virtual terminal /dev/ttyN"
#define delgroup_trivial_usage \
"GROUP"
USE_FEATURE_DEL_USER_FROM_GROUP("[USER] ")"GROUP"
#define delgroup_full_usage \
"Delete group GROUP from the system"
"Delete group GROUP from the system" \
USE_FEATURE_DEL_USER_FROM_GROUP(" or user USER from group GROUP")
#define deluser_trivial_usage \
"USER"

8
loginutils/Config.in
View File

@ -74,6 +74,14 @@ config DELGROUP
help
Utility for deleting a group account.
config FEATURE_DEL_USER_FROM_GROUP
bool "Support for removing users from groups."
default n
depends on DELGROUP
help
If called with two non-option arguments, deluser
or delgroup will remove an user from a specified group.
config ADDUSER
bool "adduser"
default n

154
loginutils/deluser.c
View File

@ -1,10 +1,10 @@
/* vi: set sw=4 ts=4: */
/*
* deluser (remove lusers from the system ;) for TinyLogin
* deluser/delgroup implementation for busybox
*
* Copyright (C) 1999 by Lineo, inc. and John Beppu
* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
* Unified with delgroup by Tito Ragusa <farmatito@tiscali.it>
* Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
*
* Licensed under GPL version 2, see file LICENSE in this tarball for details.
*
@ -12,72 +12,114 @@
#include "busybox.h"
static void del_line_matching(const char *login, const char *filename)
/* Status */
#define STATUS_OK 0
#define NAME_NOT_FOUND 1
#define MEMBER_NOT_FOUND 2
static void del_line_matching(char **args,
const char *filename,
FILE *(*fopen_func)(const char *fileName, const char *mode))
{
char *line;
FILE *passwd;
int len = strlen(login);
int found = 0;
llist_t *plist = NULL;
smallint error = NAME_NOT_FOUND;
char *name = (ENABLE_FEATURE_DEL_USER_FROM_GROUP && args[2]) ? args[2] : args[1];
char *line, *del;
char *new = xzalloc(1);
passwd = fopen_or_warn(filename, "r");
if (!passwd) return;
passwd = fopen_func(filename, "r");
if (passwd) {
while ((line = xmalloc_fgets(passwd))) {
int len = strlen(name);
while ((line = xmalloc_fgets(passwd))) {
if (!strncmp(line, login, len)
&& line[len] == ':'
) {
found++;
free(line);
} else {
llist_add_to_end(&plist, line);
}
}
if (!ENABLE_FEATURE_CLEAN_UP) {
if (!found) {
bb_error_msg("can't find '%s' in '%s'", login, filename);
return;
}
passwd = fopen_or_warn(filename, "w");
if (passwd)
while ((line = llist_pop(&plist)))
fputs(line, passwd);
} else {
if (!found) {
bb_error_msg("can't find '%s' in '%s'", login, filename);
goto clean_up;
}
fclose(passwd);
passwd = fopen_or_warn(filename, "w");
if (passwd) {
clean_up:
while ((line = llist_pop(&plist))) {
if (found) fputs(line, passwd);
free(line);
if (strncmp(line, name, len) == 0
&& line[len] == ':'
) {
error = STATUS_OK;
if (ENABLE_FEATURE_DEL_USER_FROM_GROUP) {
struct group *gr;
char *p;
if (args[2]
/* There were two args on commandline */
&& (gr = getgrnam(name))
/* The group was not deleted in the meanwhile */
&& (p = strrchr(line, ':'))
/* We can find a pointer to the last ':' */
) {
error = MEMBER_NOT_FOUND;
/* Move past ':' (worst case to '\0') and cut the line */
p[1] = '\0';
/* Reuse p */
for (p = xzalloc(1); *gr->gr_mem != NULL; gr->gr_mem++) {
/* Add all the other group members */
if (strcmp(args[1], *gr->gr_mem) != 0) {
del = p;
p = xasprintf("%s%s%s", p, p[0] ? "," : "", *gr->gr_mem);
free(del);
} else
error = STATUS_OK;
}
/* Recompose the line */
line = xasprintf("%s%s\n", line, p);
if (ENABLE_FEATURE_CLEAN_UP) free(p);
} else
goto skip;
}
}
del = new;
new = xasprintf("%s%s", new, line);
free(del);
skip:
free(line);
}
if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
if (error) {
if (ENABLE_FEATURE_DEL_USER_FROM_GROUP && error == MEMBER_NOT_FOUND) {
/* Set the correct values for error message */
filename = name;
name = args[1];
}
bb_error_msg("can't find %s in %s", name, filename);
} else {
passwd = fopen_func(filename, "w");
if (passwd) {
fputs(new, passwd);
if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
}
fclose(passwd);
}
}
free(new);
}
int deluser_main(int argc, char **argv);
int deluser_main(int argc, char **argv)
{
if (argc != 2)
bb_show_usage();
if (ENABLE_DELUSER
&& (!ENABLE_DELGROUP || applet_name[3] == 'u')
if (argc == 2
|| (ENABLE_FEATURE_DEL_USER_FROM_GROUP
&& (applet_name[3] == 'g' && argc == 3))
) {
del_line_matching(argv[1], bb_path_passwd_file);
if (geteuid())
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
if ((ENABLE_FEATURE_DEL_USER_FROM_GROUP && argc != 3)
|| ENABLE_DELUSER
|| (ENABLE_DELGROUP && ENABLE_DESKTOP)
) {
if (ENABLE_DELUSER
&& (!ENABLE_DELGROUP || applet_name[3] == 'u')
) {
del_line_matching(argv, bb_path_passwd_file, xfopen);
if (ENABLE_FEATURE_SHADOWPASSWDS)
del_line_matching(argv, bb_path_shadow_file, fopen_or_warn);
} else if (ENABLE_DESKTOP && ENABLE_DELGROUP && getpwnam(argv[1]))
bb_error_msg_and_die("can't remove primary group of user %s", argv[1]);
}
del_line_matching(argv, bb_path_group_file, xfopen);
if (ENABLE_FEATURE_SHADOWPASSWDS)
del_line_matching(argv[1], bb_path_shadow_file);
}
del_line_matching(argv[1], bb_path_group_file);
if (ENABLE_FEATURE_SHADOWPASSWDS)
del_line_matching(argv[1], bb_path_gshadow_file);
return EXIT_SUCCESS;
del_line_matching(argv, bb_path_gshadow_file, fopen_or_warn);
return EXIT_SUCCESS;
} else
bb_show_usage();
}

1
scripts/defconfig
View File

@ -349,6 +349,7 @@ CONFIG_USE_BB_PWD_GRP=y
CONFIG_ADDGROUP=y
CONFIG_FEATURE_ADDUSER_TO_GROUP=y
CONFIG_DELGROUP=y
CONFIG_FEATURE_DEL_USER_FROM_GROUP=y
CONFIG_ADDUSER=y
CONFIG_DELUSER=y
CONFIG_GETTY=y