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Diffstat (limited to 'libbb/update_passwd.c')
-rw-r--r--libbb/update_passwd.c38
1 files changed, 36 insertions, 2 deletions
diff --git a/libbb/update_passwd.c b/libbb/update_passwd.c
index a30af6f72..dc26ebd1d 100644
--- a/libbb/update_passwd.c
+++ b/libbb/update_passwd.c
@@ -62,6 +62,8 @@ static void check_selinux_update_passwd(const char *username)
only if CONFIG_PASSWD=y and applet_name[0] == 'p' like in passwd
or if CONFIG_CHPASSWD=y and applet_name[0] == 'c' like in chpasswd
+ 8) delete a user from all groups: update_passwd(FILE, NULL, NULL, MEMBER)
+
This function does not validate the arguments fed to it
so the calling program should take care of that.
@@ -99,12 +101,13 @@ int FAST_FUNC update_passwd(const char *filename,
if (filename == NULL)
return ret;
- check_selinux_update_passwd(name);
+ if (name)
+ check_selinux_update_passwd(name);
/* New passwd file, "/etc/passwd+" for now */
fnamesfx = xasprintf("%s+", filename);
sfx_char = &fnamesfx[strlen(fnamesfx)-1];
- name_colon = xasprintf("%s:", name);
+ name_colon = xasprintf("%s:", name ? name : "");
user_len = strlen(name_colon);
if (shadow)
@@ -167,6 +170,37 @@ int FAST_FUNC update_passwd(const char *filename,
line = xmalloc_fgetline(old_fp);
if (!line) /* EOF/error */
break;
+
+ if (!name && member) {
+ /* Delete member from all groups */
+ /* line is "GROUP:PASSWD:[member1[,member2]...]" */
+ unsigned member_len = strlen(member);
+ char *list = strrchr(line, ':');
+ while (list) {
+ list++;
+ next_list_element:
+ if (strncmp(list, member, member_len) == 0) {
+ char c;
+ changed_lines++;
+ c = list[member_len];
+ if (c == '\0') {
+ if (list[-1] == ',')
+ list--;
+ *list = '\0';
+ break;
+ }
+ if (c == ',') {
+ overlapping_strcpy(list, list + member_len + 1);
+ goto next_list_element;
+ }
+ changed_lines--;
+ }
+ list = strchr(list, ',');
+ }
+ fprintf(new_fp, "%s\n", line);
+ goto next;
+ }
+
if (strncmp(name_colon, line, user_len) != 0) {
fprintf(new_fp, "%s\n", line);
goto next;