#include "nsswitch-internal.h"
#include "nonlocal.h"
-#define MAGIC_LOCAL_GR_BUFLEN (sysconf(_SC_GETGR_R_SIZE_MAX) + 7)
#define MAGIC_NONLOCAL_GROUPNAME "nss-nonlocal-users"
#define MAGIC_LOCAL_GROUPNAME "nss-local-users"
+enum nss_status
+_nss_nonlocal_getgrnam_r(const char *name, struct group *grp,
+ char *buffer, size_t buflen, int *errnop);
+
+enum nss_status
+_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
+ char *buffer, size_t buflen, int *errnop);
+
+
static service_user *
nss_group_nonlocal_database(void)
{
enum nss_status
check_nonlocal_gid(const char *user, gid_t gid, int *errnop)
{
- enum nss_status status = NSS_STATUS_SUCCESS;
+ static const char *fct_name = "getgrgid_r";
+ static service_user *startp = NULL;
+ static void *fct_start = NULL;
+ enum nss_status status;
+ service_user *nip;
+ union {
+ enum nss_status (*l)(gid_t gid, struct group *grp,
+ char *buffer, size_t buflen, int *errnop);
+ void *ptr;
+ } fct;
struct group gbuf;
- struct group *gbufp = &gbuf;
- int ret;
int old_errno = errno;
- int buflen = MAGIC_LOCAL_GR_BUFLEN;
+
+ int buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
char *buf = malloc(buflen);
if (buf == NULL) {
*errnop = ENOMEM;
errno = old_errno;
return NSS_STATUS_TRYAGAIN;
}
- ret = getgrgid_r(gid, gbufp, buf, buflen, &gbufp);
- if (ret != 0) {
- *errnop = old_errno;
- status = NSS_STATUS_TRYAGAIN;
- } else if (gbufp != NULL) {
+
+ if (fct_start == NULL &&
+ __nss_group_lookup(&startp, fct_name, &fct_start) != 0) {
+ free(buf);
+ return NSS_STATUS_UNAVAIL;
+ }
+ nip = startp;
+ fct.ptr = fct_start;
+ do {
+ morebuf:
+ if (fct.l == _nss_nonlocal_getgrgid_r)
+ status = NSS_STATUS_NOTFOUND;
+ else
+ status = DL_CALL_FCT(fct.l, (gid, &gbuf, buf, buflen, errnop));
+ if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
+ free(buf);
+ buflen *= 2;
+ buf = malloc(buflen);
+ if (buf == NULL) {
+ *errnop = ENOMEM;
+ errno = old_errno;
+ return NSS_STATUS_TRYAGAIN;
+ }
+ goto morebuf;
+ }
+ } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+
+ if (status == NSS_STATUS_SUCCESS) {
syslog(LOG_WARNING, "nss_nonlocal: removing local group %u (%s) from non-local user %s\n", gbuf.gr_gid, gbuf.gr_name, user);
status = NSS_STATUS_NOTFOUND;
+ } else if (status != NSS_STATUS_TRYAGAIN) {
+ status = NSS_STATUS_SUCCESS;
}
+
free(buf);
- errno = old_errno;
return status;
}
enum nss_status
get_local_group(const char *name, struct group *grp, char *buffer, size_t buflen, int *errnop)
{
- enum nss_status status = NSS_STATUS_NOTFOUND;
+ static const char *fct_name = "getgrnam_r";
+ static service_user *startp = NULL;
+ static void *fct_start = NULL;
+ enum nss_status status;
+ service_user *nip;
+ union {
+ enum nss_status (*l)(const char *name, struct group *grp,
+ char *buffer, size_t buflen, int *errnop);
+ void *ptr;
+ } fct;
struct group gbuf;
- struct group *gbufp = &gbuf;
- int ret, n;
+ int n;
int old_errno = errno;
- int len = MAGIC_LOCAL_GR_BUFLEN;
+
+ int len = sysconf(_SC_GETGR_R_SIZE_MAX);
char *buf = malloc(len);
if (buf == NULL) {
*errnop = ENOMEM;
errno = old_errno;
return NSS_STATUS_TRYAGAIN;
}
- 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;
- 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;
+ if (fct_start == NULL &&
+ __nss_group_lookup(&startp, fct_name, &fct_start) != 0) {
+ free(buf);
+ return NSS_STATUS_UNAVAIL;
+ }
+ nip = startp;
+ fct.ptr = fct_start;
+ do {
+ morebuf:
+ if (fct.l == _nss_nonlocal_getgrnam_r)
+ status = NSS_STATUS_NOTFOUND;
+ else
+ status = DL_CALL_FCT(fct.l, (name, &gbuf, buf, len, errnop));
+ if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
+ free(buf);
+ len *= 2;
+ buf = malloc(len);
+ if (buf == NULL) {
+ *errnop = ENOMEM;
+ errno = old_errno;
+ return NSS_STATUS_TRYAGAIN;
+ }
+ goto morebuf;
}
- grp->gr_passwd = buffer;
- buffer += n;
- buflen -= n;
+ } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+
+ if (status != NSS_STATUS_SUCCESS)
+ goto get_local_group_done;
- grp->gr_gid = gbufp->gr_gid;
+ n = snprintf(buffer, buflen, "%s", gbuf.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;
- if (buflen < sizeof(void *)) {
- *errnop = ERANGE;
- status = NSS_STATUS_TRYAGAIN;
- goto get_local_group_done;
- }
- *(void **)buffer = NULL;
- buffer += sizeof(void *);
- buflen -= sizeof(void *);
+ n = snprintf(buffer, buflen, "%s", gbuf.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 = gbuf.gr_gid;
+
+ if (buflen < sizeof(void *)) {
+ *errnop = ERANGE;
+ status = NSS_STATUS_TRYAGAIN;
+ goto get_local_group_done;
}
+ *(void **)buffer = NULL;
+ buffer += sizeof(void *);
+ buflen -= sizeof(void *);
+
get_local_group_done:
free(buf);
- errno = old_errno;
return status;
}
enum nss_status status;
char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
- if (buflen == MAGIC_LOCAL_GR_BUFLEN ||
- (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
+ if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
return NSS_STATUS_UNAVAIL;
if (grent_nip == NULL) {
} fct;
char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
- if (buflen == MAGIC_LOCAL_GR_BUFLEN ||
- (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
+ if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
return NSS_STATUS_UNAVAIL;
nip = nss_group_nonlocal_database();
} fct;
char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
- if (buflen == MAGIC_LOCAL_GR_BUFLEN ||
- (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
+ if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
return NSS_STATUS_UNAVAIL;
nip = nss_group_nonlocal_database();
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!",
if (newsize > limit)
newsize = limit;
}
- newgroups = realloc(*groupsp, *size * sizeof((*groupsp)[0]));
+ newgroups = realloc(*groupsp, newsize * sizeof((*groupsp)[0]));
if (newgroups == NULL) {
*errnop = ENOMEM;
errno = old_errno;
}
}
- errno = old_errno;
-
if (is_local)
return NSS_STATUS_SUCCESS;
andersk / nss_nonlocal.git / blobdiff