errno = old_errno;
return NSS_STATUS_TRYAGAIN;
}
- errno = 0;
ret = getgrgid_r(gid, gbufp, buf, buflen, &gbufp);
if (ret != 0) {
*errnop = old_errno;
enum nss_status status = NSS_STATUS_NOTFOUND;
struct group gbuf;
struct group *gbufp = &gbuf;
- int ret;
+ int ret, n;
int old_errno = errno;
int len = MAGIC_LOCAL_GR_BUFLEN;
char *buf = malloc(len);
errno = old_errno;
return NSS_STATUS_TRYAGAIN;
}
- errno = 0;
ret = getgrnam_r(name, gbufp, buf, len, &gbufp);
if (ret != 0) {
*errnop = old_errno;
status = NSS_STATUS_TRYAGAIN;
} else if (gbufp != NULL) {
status = NSS_STATUS_SUCCESS;
- grp->gr_name = strncpy(buffer, gbufp->gr_name, buflen);
- buffer = buffer + strlen(grp->gr_name);
- buflen = buflen - strlen(grp->gr_name);
- grp->gr_passwd = strncpy(buffer, gbufp->gr_passwd, buflen);
- buffer = buffer + strlen(grp->gr_passwd);
- buflen = buflen - strlen(grp->gr_passwd);
+
+ n = snprintf(buffer, buflen, "%s", gbufp->gr_name);
+ if (n < 0 || n >= buflen) {
+ *errnop = ERANGE;
+ status = NSS_STATUS_TRYAGAIN;
+ goto get_local_group_done;
+ }
+ grp->gr_name = buffer;
+ buffer += n;
+ buflen -= n;
+
+ n = snprintf(buffer, buflen, "%s", gbufp->gr_passwd);
+ if (n < 0 || n >= buflen) {
+ *errnop = ERANGE;
+ status = NSS_STATUS_TRYAGAIN;
+ goto get_local_group_done;
+ }
+ grp->gr_passwd = buffer;
+ buffer += n;
+ buflen -= n;
+
grp->gr_gid = gbufp->gr_gid;
+
if (buflen < sizeof(void *)) {
*errnop = ERANGE;
status = NSS_STATUS_TRYAGAIN;
+ goto get_local_group_done;
}
- else {
- grp->gr_mem = memset(buffer, 0, sizeof(void *));
- }
+ *(void **)buffer = NULL;
+ buffer += sizeof(void *);
+ buflen -= sizeof(void *);
}
+ get_local_group_done:
free(buf);
errno = old_errno;
return status;
int *errnop)
{
enum nss_status status;
+
+ char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
+ if (buflen == MAGIC_LOCAL_GR_BUFLEN ||
+ (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
+ return NSS_STATUS_UNAVAIL;
+
if (grent_nip == NULL) {
status = _nss_nonlocal_setgrent(0);
if (status != NSS_STATUS_SUCCESS)
void *ptr;
} fct;
- if (buflen == MAGIC_LOCAL_GR_BUFLEN)
+ char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
+ if (buflen == MAGIC_LOCAL_GR_BUFLEN ||
+ (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
return NSS_STATUS_UNAVAIL;
nip = nss_group_nonlocal_database();
void *ptr;
} fct;
- if (buflen == MAGIC_LOCAL_GR_BUFLEN)
+ char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
+ if (buflen == MAGIC_LOCAL_GR_BUFLEN ||
+ (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
return NSS_STATUS_UNAVAIL;
nip = nss_group_nonlocal_database();
int *errnop);
void *ptr;
} fct;
- int in = *start, out = *start, i;
- gid_t local_users_gid;
+
+ struct group local_users_group, nonlocal_users_group;
+ gid_t local_users_gid, gid;
int is_local = 0;
+ int buflen;
+ char *buffer;
- // Check that the user is a nonlocal user before adding any groups
+ /* Check that the user is a nonlocal user before adding any groups. */
status = check_nonlocal_user(user, errnop);
- if (status == NSS_STATUS_NOTFOUND) {
- is_local = 1;
- }
- else if (status != NSS_STATUS_SUCCESS) {
+ if (status == NSS_STATUS_TRYAGAIN)
return status;
- }
+ else if (status != NSS_STATUS_SUCCESS)
+ is_local = 1;
+
+ int old_errno = errno;
- int buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
- char *buffer = malloc(buflen);
+ buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+ buffer = malloc(buflen);
if (buffer == NULL) {
*errnop = ENOMEM;
+ errno = old_errno;
return NSS_STATUS_TRYAGAIN;
}
- struct group local_users_group;
status = get_local_group(MAGIC_LOCAL_GROUPNAME,
&local_users_group, buffer, buflen, errnop);
- free(buffer);
- if (status == NSS_STATUS_NOTFOUND) {
+ if (status == NSS_STATUS_SUCCESS) {
+ local_users_gid = local_users_group.gr_gid;
+ } else if (status == NSS_STATUS_TRYAGAIN) {
+ free(buffer);
+ return status;
+ } else {
syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
MAGIC_LOCAL_GROUPNAME);
- local_users_gid = 0;
+ local_users_gid = -1;
}
- else if (status == NSS_STATUS_SUCCESS) {
- if (is_local == 1) {
- // add the (local) user to the magic local users group, and finish
- (*groupsp)[out++] = local_users_group.gr_gid;
- syslog(LOG_DEBUG, "nss_nonlocal: Added %s to special group %s",
- user, MAGIC_LOCAL_GROUPNAME);
- *start = out;
- return NSS_STATUS_SUCCESS;
+ free(buffer);
+
+ if (is_local) {
+ gid = local_users_gid;
+ } else {
+ buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+ buffer = malloc(buflen);
+ if (buffer == NULL) {
+ *errnop = ENOMEM;
+ errno = old_errno;
+ return NSS_STATUS_TRYAGAIN;
}
- else {
- local_users_gid = local_users_group.gr_gid;
+ status = get_local_group(MAGIC_NONLOCAL_GROUPNAME,
+ &nonlocal_users_group, buffer, buflen, errnop);
+ if (status == NSS_STATUS_SUCCESS) {
+ gid = nonlocal_users_group.gr_gid;
+ } else if (status == NSS_STATUS_TRYAGAIN) {
+ free(buffer);
+ errno = old_errno;
+ return status;
+ } else {
+ syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
+ MAGIC_NONLOCAL_GROUPNAME);
+ gid = -1;
}
+ free(buffer);
}
- else {
- return status;
+
+ if (gid != -1) {
+ int i;
+ for (i = 0; i < *start; ++i)
+ if ((*groupsp)[i] == gid)
+ break;
+ if (i >= *start) {
+ if (*start + 1 > *size) {
+ gid_t *newgroups;
+ long int newsize = 2 * *size;
+ if (limit > 0) {
+ if (*size >= limit)
+ return NSS_STATUS_SUCCESS;
+ if (newsize > limit)
+ newsize = limit;
+ }
+ newgroups = realloc(*groupsp, *size * sizeof((*groupsp)[0]));
+ if (newgroups == NULL) {
+ *errnop = ENOMEM;
+ errno = old_errno;
+ return NSS_STATUS_TRYAGAIN;
+ }
+ *groupsp = newgroups;
+ *size = newsize;
+ }
+ (*groupsp)[(*start)++] = gid;
+ }
}
+ errno = old_errno;
+
+ if (is_local)
+ return NSS_STATUS_SUCCESS;
+
+ int in = *start, out = *start, i;
+
nip = nss_group_nonlocal_database();
if (nip == NULL)
return NSS_STATUS_UNAVAIL;
if (i < out)
continue;
+ /* Don't let users get into MAGIC_LOCAL_GROUPNAME from nonlocal reasons. */
+ if (local_users_gid == (*groupsp)[in]) {
+ syslog(LOG_WARNING, "nss_nonlocal: Nonlocal user %s removed from special local users group %s",
+ user, MAGIC_LOCAL_GROUPNAME);
+ continue;
+ }
+
status = check_nonlocal_gid(user, (*groupsp)[in], &nonlocal_errno);
if (status == NSS_STATUS_SUCCESS) {
- // Don't let users get into MAGIC_LOCAL_GROUPNAME from nonlocal reasons.
- if ((*groupsp)[in] == local_users_gid) {
- syslog(LOG_WARNING, "nss_nonlocal: Nonlocal user %s removed from special local users group %s",
- user, MAGIC_LOCAL_GROUPNAME);
- }
- else {
- (*groupsp)[out++] = (*groupsp)[in];
- }
- } else if (status != NSS_STATUS_NOTFOUND) {
+ (*groupsp)[out++] = (*groupsp)[in];
+ } else if (status == NSS_STATUS_TRYAGAIN) {
*start = out;
*errnop = nonlocal_errno;
return status;
}
}
- // add the (nonlocal) user to the magic nonlocal users group
- buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
- buffer = malloc(buflen);
- if (buffer == NULL) {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
- struct group nonlocal_users_group;
- status = get_local_group(MAGIC_NONLOCAL_GROUPNAME,
- &nonlocal_users_group, buffer, buflen, errnop);
- if (status == NSS_STATUS_NOTFOUND) {
- syslog(LOG_WARNING, "nss_nonlocal: (local) group %s does not exist!",
- MAGIC_NONLOCAL_GROUPNAME);
- }
- else if (status == NSS_STATUS_SUCCESS) {
- (*groupsp)[out++] = nonlocal_users_group.gr_gid;
- syslog(LOG_DEBUG, "nss_nonlocal: Added %s to special group %s",
- user, MAGIC_NONLOCAL_GROUPNAME);
- }
- free(buffer);
-
*start = out;
return NSS_STATUS_SUCCESS;
}
andersk / nss_nonlocal.git / blobdiff