* NEWS, lib/getdef.c, man/login.defs.5.xml: New login.defs
variable: MAX_MEMBERS_PER_GROUP. Used for the split groups support. * lib/commonio.c, lib/commonio.h: Add an open_hook and close_hook operation. They are called after the database is actually opened and parse, or before it is closed. * lib/groupio.c: Add an open_hook to merge split groups, and an close group to split groups if MAX_MEMBERS_PER_GROUP is set. This fixes gpasswd and chgpasswd when split groups are used. * lib/sgroupio.c, lib/shadowio.c, lib/pwio.c: No open or close hooks for these databases. (unsure about what should be the gshadow behavior for split groups)
This commit is contained in:
nekral-guest
parent
a0488ccac2
commit
e15fbb905c
14
ChangeLog
14
ChangeLog
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@ -1,3 +1,17 @@
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2007-11-22 Nicolas François <nicolas.francois@centraliens.net>
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* NEWS, lib/getdef.c, man/login.defs.5.xml: New login.defs
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variable: MAX_MEMBERS_PER_GROUP. Used for the split groups support.
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* lib/commonio.c, lib/commonio.h: Add an open_hook and close_hook
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operation. They are called after the database is actually opened
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and parse, or before it is closed.
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* lib/groupio.c: Add an open_hook to merge split groups, and an
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close group to split groups if MAX_MEMBERS_PER_GROUP is set.
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This fixes gpasswd and chgpasswd when split groups are used.
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* lib/sgroupio.c, lib/shadowio.c, lib/pwio.c: No open or close
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hooks for these databases. (unsure about what should be the gshadow
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behavior for split groups)
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2007-11-22 Nicolas François <nicolas.francois@centraliens.net>
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* NEWS, src/gpasswd.c: Read the group and shadow groups using
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4
NEWS
4
NEWS
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@ -46,6 +46,10 @@ shadow-4.0.18.1 -> shadow-4.0.18.2 UNRELEASED
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- gpasswd: Only read information from the local file group database. It
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writes the changes in /etc/group and/or /etc/gshadow, but used to read
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information from getgrnam (hence possibly from another group database).
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- New login.defs variable: MAX_MEMBERS_PER_GROUP. It should provide a
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better support for split groups. Be careful when using this variable:
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not all tools support well split groups (in or out of the shadow
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tool suite). It fixes gpasswd and chgpasswd when split groups are used.
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*** documentation:
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- Generate the translated manpages from PO at build time.
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@ -520,6 +520,9 @@ int commonio_open (struct commonio_db *db, int mode)
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if (ferror (db->fp))
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goto cleanup_errno;
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if (db->ops->open_hook && !db->ops->open_hook ())
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goto cleanup_errno;
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db->isopen = 1;
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return 1;
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@ -669,6 +672,9 @@ int commonio_close (struct commonio_db *db)
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goto success;
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}
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if (db->ops->close_hook && !db->ops->close_hook ())
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goto fail;
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memzero (&sb, sizeof sb);
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if (db->fp) {
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if (fstat (fileno (db->fp), &sb)) {
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@ -52,6 +52,15 @@ struct commonio_ops {
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*/
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char *(*fgets) (char *, int, FILE *);
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int (*fputs) (const char *, FILE *);
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/*
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* open_hook and close_hook.
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* If non NULL, these functions will be called after the database
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* is open or before it is closed.
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* They return 0 on failure and 1 on success.
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*/
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int (*open_hook) (void);
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int (*close_hook) (void);
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};
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/*
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@ -68,6 +68,7 @@ static struct itemdef def_table[] = {
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{"LOG_UNKFAIL_ENAB", NULL},
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{"MAIL_DIR", NULL},
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{"MAIL_FILE", NULL},
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{"MAX_MEMBERS_PER_GROUP", NULL},
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{"MD5_CRYPT_ENAB", NULL},
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{"PASS_MAX_DAYS", NULL},
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{"PASS_MIN_DAYS", NULL},
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187
lib/groupio.c
187
lib/groupio.c
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@ -10,6 +10,11 @@
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extern int putgrent (const struct group *, FILE *);
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extern struct group *sgetgrent (const char *);
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static struct commonio_entry *merge_group_entries (struct commonio_entry *,
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struct commonio_entry *);
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static int split_groups (unsigned int);
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static int group_open_hook (void);
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static void *group_dup (const void *ent)
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{
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const struct group *gr = ent;
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@ -49,6 +54,16 @@ static int group_put (const void *ent, FILE * file)
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return (putgrent (gr, file) == -1) ? -1 : 0;
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}
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static int group_close_hook (void)
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{
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unsigned int max_members = getdef_unum("MAX_MEMBERS_PER_GROUP", 0);
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if (0 == max_members)
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return 1;
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return split_groups (max_members);
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}
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static struct commonio_ops group_ops = {
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group_dup,
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group_free,
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@ -56,7 +71,9 @@ static struct commonio_ops group_ops = {
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group_parse,
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group_put,
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fgetsx,
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fputsx
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fputsx,
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group_open_hook,
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group_close_hook
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};
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static struct commonio_db group_db = {
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@ -170,3 +187,171 @@ int gr_sort ()
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{
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return commonio_sort (&group_db, gr_cmp);
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}
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static int group_open_hook (void)
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{
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unsigned int max_members = getdef_unum("MAX_MEMBERS_PER_GROUP", 0);
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struct commonio_entry *gr1, *gr2;
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if (0 == max_members)
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return 1;
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for (gr1 = group_db.head; gr1; gr1 = gr1->next) {
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for (gr2 = gr1->next; gr2; gr2 = gr2->next) {
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struct group *g1 = (struct group *)gr1->eptr;
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struct group *g2 = (struct group *)gr2->eptr;
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if (NULL != g1 &&
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NULL != g2 &&
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0 == strcmp (g1->gr_name, g2->gr_name) &&
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0 == strcmp (g1->gr_passwd, g2->gr_passwd) &&
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g1->gr_gid == g2->gr_gid) {
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/* Both group entries refer to the same
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* group. It is a split group. Merge the
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* members. */
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gr1 = merge_group_entries (gr1, gr2);
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if (NULL == gr1)
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return 0;
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/* Unlink gr2 */
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if (NULL != gr2->next)
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gr2->next->prev = gr2->prev;
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gr2->prev->next = gr2->next;
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}
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}
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}
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return 1;
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}
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/*
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* Merge the list of members of the two group entries.
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*
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* The commonio_entry arguments shall be group entries.
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*
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* You should not merge the members of two groups if they don't have the
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* same name, password and gid.
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*
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* It merge the members of the second entry in the first one, and return
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* the modified first entry on success, or NUll on failure (with errno
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* set).
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*/
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static struct commonio_entry *merge_group_entries (struct commonio_entry *gr1,
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struct commonio_entry *gr2)
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{
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struct group *gptr1;
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struct group *gptr2;
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char *member;
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char **new_members;
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int members = 0;
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char *new_line;
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int new_line_len, i;
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if (NULL == gr2 || NULL == gr1) {
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errno = EINVAL;
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return NULL;
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}
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gptr1 = (struct group *)gr1->eptr;
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gptr2 = (struct group *)gr2->eptr;
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if (NULL == gptr2 || NULL == gptr1) {
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errno = EINVAL;
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return NULL;
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}
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/* Concatenate the 2 lines */
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new_line_len = strlen (gr1->line) + strlen (gr2->line) +1;
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new_line = (char *)malloc ((new_line_len + 1) * sizeof(char*));
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if (NULL == new_line) {
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errno = ENOMEM;
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return NULL;
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}
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snprintf(new_line, new_line_len, "%s\n%s", gr1->line, gr2->line);
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new_line[new_line_len] = '\0';
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/* Concatenate the 2 list of members */
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for (i=0; NULL != gptr1->gr_mem[i]; i++);
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members += i;
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for (i=0; NULL != gptr2->gr_mem[i]; i++) {
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char **pmember = gptr1->gr_mem;
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while (NULL != *pmember) {
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if (0 == strcmp(*pmember, gptr2->gr_mem[i]))
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break;
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pmember++;
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}
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if (NULL == *pmember)
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members++;
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}
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new_members = (char **)malloc ( (members+1) * sizeof(char*) );
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if (NULL == new_members) {
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errno = ENOMEM;
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return NULL;
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}
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for (i=0; NULL != gptr1->gr_mem[i]; i++)
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new_members[i] = gptr1->gr_mem[i];
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members = i;
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for (i=0; NULL != gptr2->gr_mem[i]; i++) {
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char **pmember = new_members;
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while (NULL != *pmember) {
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if (0 == strcmp(*pmember, gptr2->gr_mem[i]))
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break;
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pmember++;
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}
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if (NULL == *pmember) {
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new_members[members++] = gptr2->gr_mem[i];
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new_members[members] = NULL;
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}
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}
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gr1->line = new_line;
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gptr1->gr_mem = new_members;
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return gr1;
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}
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/*
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* Scan the group database and split the groups which have more members
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* than specified, if this is the result from a current change.
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*
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* Return 0 on failure (errno set) and 1 on success.
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*/
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static int split_groups (unsigned int max_members)
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{
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struct commonio_entry *gr;
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for (gr = group_db.head; gr; gr = gr->next) {
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struct group *gptr = (struct group *)gr->eptr;
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struct commonio_entry *new;
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struct group *new_gptr;
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unsigned int members = 0;
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/* Check if this group must be split */
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if (!gr->changed)
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continue;
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if (NULL == gptr)
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continue;
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for (members = 0; NULL != gptr->gr_mem[members]; members++);
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if (members <= max_members)
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continue;
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new = (struct commonio_entry *) malloc (sizeof *new);
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new->eptr = group_dup(gr->eptr);
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if (NULL == new->eptr) {
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errno = ENOMEM;
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return 0;
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}
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new_gptr = (struct group *)new->eptr;
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new->line = NULL;
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new->changed = 1;
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/* Enforce the maximum number of members on gptr */
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gptr->gr_mem[max_members] = NULL;
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/* The number of members in new_gptr will be check later */
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new_gptr->gr_mem = &new_gptr->gr_mem[max_members];
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/* insert the new entry in the list */
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new->prev = gr;
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new->next = gr->next;
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gr->next = new;
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}
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return 1;
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}
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@ -57,7 +57,9 @@ static struct commonio_ops passwd_ops = {
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passwd_parse,
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passwd_put,
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fgets,
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fputs
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fputs,
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NULL, /* open_hook */
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NULL /* close_hook */
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};
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static struct commonio_db passwd_db = {
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@ -100,7 +100,9 @@ static struct commonio_ops gshadow_ops = {
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gshadow_parse,
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gshadow_put,
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fgetsx,
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fputsx
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fputsx,
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NULL, /* open_hook */
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NULL /* close_hook */
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};
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static struct commonio_db gshadow_db = {
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@ -54,7 +54,9 @@ static struct commonio_ops shadow_ops = {
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shadow_parse,
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shadow_put,
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fgets,
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fputs
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fputs,
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NULL, /* open_hook */
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NULL /* close_hook */
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};
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static struct commonio_db shadow_db = {
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@ -121,6 +121,36 @@
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>MAX_MEMBERS_PER_GROUP (number)</term>
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<listitem>
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<para>
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Maximum members per group entry. When the maximum is reached,
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a new group entry (line) is started is
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<filename>/etc/group</filename> (with the same name, same
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password, and same GID).
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</para>
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<para>
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The default value is 0, meaning that there are no limits in
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the number of members in a group.
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</para>
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<!-- Note: on HP, split groups have the same ID, but different
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names. -->
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<para>
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This feature (split group) permits to limit the length of
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lines in the group file. This is useful to make sure that
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lines for NIS groups are not larger than 1024 characters.
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</para>
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<para>
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If you need to enforce such limit, you can use 25.
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</para>
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<para>
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Note: split groups may not be supported by all tools (even in
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the Shadow toolsuite. Yous hould not use this variable unless
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you really need it.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>MD5_CRYPT_ENAB (boolean)</term>
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<listitem>
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