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add -U option to groupadd and groupmod

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Add a -U option which adds new usernames as members.  For groupmod,
also add -a (append), without which existing members are removed.

Closes #265
This commit is contained in:
Serge Hallyn 2020-08-09 16:44:30 -05:00
parent 7ea342579e
commit 342c934a35
6 changed files with 147 additions and 10 deletions
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49
lib/groupmem.c
View File

@ -87,6 +87,18 @@
return gr;
}
void gr_free_members (struct group *grent)
{
if (NULL != grent->gr_mem) {
size_t i;
for (i = 0; NULL != grent->gr_mem[i]; i++) {
free (grent->gr_mem[i]);
}
free (grent->gr_mem);
grent->gr_mem = NULL;
}
}
void gr_free (/*@out@*/ /*@only@*/struct group *grent)
{
free (grent->gr_name);
@ -94,13 +106,36 @@ void gr_free (/*@out@*/ /*@only@*/struct group *grent)
memzero (grent->gr_passwd, strlen (grent->gr_passwd));
free (grent->gr_passwd);
}
if (NULL != grent->gr_mem) {
size_t i;
for (i = 0; NULL != grent->gr_mem[i]; i++) {
free (grent->gr_mem[i]);
}
free (grent->gr_mem);
}
gr_free_members(grent);
free (grent);
}
bool gr_append_member(struct group *grp, char *member)
{
int i;
if (NULL == grp->gr_mem || grp->gr_mem[0] == NULL) {
grp->gr_mem = (char **)malloc(2 * sizeof(char *));
if (!grp->gr_mem) {
return false;
}
grp->gr_mem[0] = strdup(member);
if (!grp->gr_mem[0]) {
return false;
}
grp->gr_mem[1] = NULL;
return true;
}
for (i = 0; grp->gr_mem[i]; i++) ;
grp->gr_mem = realloc(grp->gr_mem, (i + 2) * sizeof(char *));
if (NULL == grp->gr_mem) {
return false;
}
grp->gr_mem[i] = strdup(member);
if (NULL == grp->gr_mem[i]) {
return false;
}
grp->gr_mem[i + 1] = NULL;
return true;
}

2
lib/prototypes.h
View File

@ -206,7 +206,9 @@ extern void __gr_set_changed (void);
/* groupmem.c */
extern /*@null@*/ /*@only@*/struct group *__gr_dup (const struct group *grent);
extern void gr_free_members (struct group *grent);
extern void gr_free (/*@out@*/ /*@only@*/struct group *grent);
extern bool gr_append_member (struct group *grp, char *member);
/* hushed.c */
extern bool hushed (const char *username);

16
man/groupadd.8.xml
View File

@ -229,6 +229,22 @@
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-U</option>, <option>--users</option>
</term>
<listitem>
<para>
A list of usernames to add as members of the group.
</para>
<para>
The default behavior (if the <option>-g</option>,
<option>-N</option>, and <option>-U</option> options are not
specified) is defined by the <option>USERGROUPS_ENAB</option>
variable in <filename>/etc/login.defs</filename>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>

25
man/groupmod.8.xml
View File

@ -92,6 +92,15 @@
are:
</para>
<variablelist remap='IP'>
<varlistentry>
<term>
<option>-a</option>, <option>--append</option>&nbsp;<replaceable>GID</replaceable>
</term>
<listitem>
<para>If group members are specified with -U, append them to the existing
member list, rather than replacing it.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-g</option>, <option>--gid</option>&nbsp;<replaceable>GID</replaceable>
@ -203,6 +212,22 @@
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-U</option>, <option>--users</option>
</term>
<listitem>
<para>
A list of usernames to add as members of the group.
</para>
<para>
The default behavior (if the <option>-g</option>,
<option>-N</option>, and <option>-U</option> options are not
specified) is defined by the <option>USERGROUPS_ENAB</option>
variable in <filename>/etc/login.defs</filename>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>

23
src/groupadd.c
View File

@ -79,6 +79,7 @@ static /*@null@*/char *group_passwd;
static /*@null@*/char *empty_list = NULL;
static const char *prefix = "";
static char *user_list;
static bool oflg = false; /* permit non-unique group ID to be specified with -g */
static bool gflg = false; /* ID value for the new group */
@ -126,7 +127,8 @@ static /*@noreturn@*/void usage (int status)
(void) fputs (_(" -p, --password PASSWORD use this encrypted password for the new group\n"), usageout);
(void) fputs (_(" -r, --system create a system account\n"), usageout);
(void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
(void) fputs (_(" -P, --prefix PREFIX_DIR directory prefix\n"), usageout);
(void) fputs (_(" -P, --prefix PREFIX_DI directory prefix\n"), usageout);
(void) fputs (_(" -U, --users USERS list of user members of this group\n"), usageout);
(void) fputs ("\n", usageout);
exit (status);
}
@ -207,6 +209,19 @@ static void grp_update (void)
}
#endif /* SHADOWGRP */
if (user_list) {
char *token;
token = strtok(user_list, ",");
while (token) {
if (prefix_getpwnam (token) == NULL) {
fprintf (stderr, _("Invalid member username %s\n"), token);
exit (E_GRP_UPDATE);
}
grp.gr_mem = add_list(grp.gr_mem, token);
token = strtok(NULL, ",");
}
}
/*
* Write out the new group file entry.
*/
@ -391,10 +406,11 @@ static void process_flags (int argc, char **argv)
{"system", no_argument, NULL, 'r'},
{"root", required_argument, NULL, 'R'},
{"prefix", required_argument, NULL, 'P'},
{"users", required_argument, NULL, 'U'},
{NULL, 0, NULL, '\0'}
};
while ((c = getopt_long (argc, argv, "fg:hK:op:rR:P:",
while ((c = getopt_long (argc, argv, "fg:hK:op:rR:P:U:",
long_options, NULL)) != -1) {
switch (c) {
case 'f':
@ -453,6 +469,9 @@ static void process_flags (int argc, char **argv)
break;
case 'P': /* no-op, handled in process_prefix_flag () */
break;
case 'U':
user_list = optarg;
break;
default:
usage (E_USAGE);
}

42
src/groupmod.c
View File

@ -87,6 +87,7 @@ static gid_t group_id;
static gid_t group_newid;
static const char* prefix = "";
static char *user_list;
static struct cleanup_info_mod info_passwd;
static struct cleanup_info_mod info_group;
@ -95,6 +96,7 @@ static struct cleanup_info_mod info_gshadow;
#endif
static bool
aflg = false, /* append -U members rather than replace them */
oflg = false, /* permit non-unique group ID to be specified with -g */
gflg = false, /* new ID value for the group */
nflg = false, /* a new name has been specified for the group */
@ -117,6 +119,7 @@ static void open_files (void);
static void close_files (void);
static void update_primary_groups (gid_t ogid, gid_t ngid);
/*
* usage - display usage message and exit
*/
@ -129,6 +132,8 @@ static void usage (int status)
"\n"
"Options:\n"),
Prog);
(void) fputs (_(" -a, --append append the users mentioned by -U option to the group \n"
" without removing existing user members\n"), usageout);
(void) fputs (_(" -g, --gid GID change the group ID to GID\n"), usageout);
(void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
(void) fputs (_(" -n, --new-name NEW_GROUP change the name to NEW_GROUP\n"), usageout);
@ -137,6 +142,7 @@ static void usage (int status)
" PASSWORD\n"), usageout);
(void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
(void) fputs (_(" -P, --prefix PREFIX_DIR prefix directory where are located the /etc/* files\n"), usageout);
(void) fputs (_(" -U, --users USERS list of user members of this group\n"), usageout);
(void) fputs ("\n", usageout);
exit (status);
}
@ -255,6 +261,32 @@ static void grp_update (void)
update_primary_groups (ogrp->gr_gid, group_newid);
}
if (user_list) {
char *token;
if (!aflg) {
// requested to replace the existing groups
if (NULL != grp.gr_mem[0])
gr_free_members(&grp);
grp.gr_mem = (char **)xmalloc(sizeof(char *));
grp.gr_mem[0] = (char *)0;
} else {
// append to existing groups
if (NULL != grp.gr_mem[0])
grp.gr_mem = dup_list (grp.gr_mem);
}
token = strtok(user_list, ",");
while (token) {
if (prefix_getpwnam (token) == NULL) {
fprintf (stderr, _("Invalid member username %s\n"), token);
exit (E_GRP_UPDATE);
}
grp.gr_mem = add_list(grp.gr_mem, token);
token = strtok(NULL, ",");
}
}
/*
* Write out the new group file entry.
*/
@ -379,6 +411,7 @@ static void process_flags (int argc, char **argv)
{
int c;
static struct option long_options[] = {
{"append", no_argument, NULL, 'a'},
{"gid", required_argument, NULL, 'g'},
{"help", no_argument, NULL, 'h'},
{"new-name", required_argument, NULL, 'n'},
@ -386,11 +419,15 @@ static void process_flags (int argc, char **argv)
{"password", required_argument, NULL, 'p'},
{"root", required_argument, NULL, 'R'},
{"prefix", required_argument, NULL, 'P'},
{"users", required_argument, NULL, 'U'},
{NULL, 0, NULL, '\0'}
};
while ((c = getopt_long (argc, argv, "g:hn:op:R:P:",
while ((c = getopt_long (argc, argv, "ag:hn:op:R:P:U:",
long_options, NULL)) != -1) {
switch (c) {
case 'a':
aflg = true;
break;
case 'g':
gflg = true;
if ( (get_gid (optarg, &group_newid) == 0)
@ -419,6 +456,9 @@ static void process_flags (int argc, char **argv)
break;
case 'P': /* no-op, handled in process_prefix_flag () */
break;
case 'U':
user_list = optarg;
break;
default:
usage (E_USAGE);
}