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Diffstat (limited to 'nss/nss_compat/compat-grp.c')
-rw-r--r--nss/nss_compat/compat-grp.c682
1 files changed, 682 insertions, 0 deletions
diff --git a/nss/nss_compat/compat-grp.c b/nss/nss_compat/compat-grp.c
new file mode 100644
index 0000000000..4d51fc95ed
--- /dev/null
+++ b/nss/nss_compat/compat-grp.c
@@ -0,0 +1,682 @@
+/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <grp.h>
+#include <nss.h>
+#include <nsswitch.h>
+#include <stdio_ext.h>
+#include <string.h>
+#include <libc-lock.h>
+#include <kernel-features.h>
+
+static service_user *ni;
+static enum nss_status (*nss_setgrent) (int stayopen);
+static enum nss_status (*nss_getgrnam_r) (const char *name,
+ struct group * grp, char *buffer,
+ size_t buflen, int *errnop);
+static enum nss_status (*nss_getgrgid_r) (gid_t gid, struct group * grp,
+ char *buffer, size_t buflen,
+ int *errnop);
+static enum nss_status (*nss_getgrent_r) (struct group * grp, char *buffer,
+ size_t buflen, int *errnop);
+static enum nss_status (*nss_endgrent) (void);
+
+/* Get the declaration of the parser function. */
+#define ENTNAME grent
+#define STRUCTURE group
+#define EXTERN_PARSER
+#include <nss/nss_files/files-parse.c>
+
+/* Structure for remembering -group members ... */
+#define BLACKLIST_INITIAL_SIZE 512
+#define BLACKLIST_INCREMENT 256
+struct blacklist_t
+{
+ char *data;
+ int current;
+ int size;
+};
+
+struct ent_t
+{
+ bool files;
+ enum nss_status setent_status;
+ FILE *stream;
+ struct blacklist_t blacklist;
+};
+typedef struct ent_t ent_t;
+
+static ent_t ext_ent = { true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
+
+/* Protect global state against multiple changers. */
+__libc_lock_define_initialized (static, lock)
+
+/* Prototypes for local functions. */
+static void blacklist_store_name (const char *, ent_t *);
+static bool in_blacklist (const char *, int, ent_t *);
+
+/* Initialize the NSS interface/functions. The calling function must
+ hold the lock. */
+static void
+init_nss_interface (void)
+{
+ if (__nss_database_lookup ("group_compat", NULL, "nis", &ni) >= 0)
+ {
+ nss_setgrent = __nss_lookup_function (ni, "setgrent");
+ nss_getgrnam_r = __nss_lookup_function (ni, "getgrnam_r");
+ nss_getgrgid_r = __nss_lookup_function (ni, "getgrgid_r");
+ nss_getgrent_r = __nss_lookup_function (ni, "getgrent_r");
+ nss_endgrent = __nss_lookup_function (ni, "endgrent");
+ }
+}
+
+static enum nss_status
+internal_setgrent (ent_t *ent, int stayopen, int needent)
+{
+ enum nss_status status = NSS_STATUS_SUCCESS;
+
+ ent->files = true;
+
+ if (ent->blacklist.data != NULL)
+ {
+ ent->blacklist.current = 1;
+ ent->blacklist.data[0] = '|';
+ ent->blacklist.data[1] = '\0';
+ }
+ else
+ ent->blacklist.current = 0;
+
+ if (ent->stream == NULL)
+ {
+ ent->stream = fopen ("/etc/group", "rme");
+
+ if (ent->stream == NULL)
+ status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
+ else
+ /* We take care of locking ourself. */
+ __fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
+ }
+ else
+ rewind (ent->stream);
+
+ if (needent && status == NSS_STATUS_SUCCESS && nss_setgrent)
+ ent->setent_status = nss_setgrent (stayopen);
+
+ return status;
+}
+
+
+enum nss_status
+_nss_compat_setgrent (int stayopen)
+{
+ enum nss_status result;
+
+ __libc_lock_lock (lock);
+
+ if (ni == NULL)
+ init_nss_interface ();
+
+ result = internal_setgrent (&ext_ent, stayopen, 1);
+
+ __libc_lock_unlock (lock);
+
+ return result;
+}
+
+
+static enum nss_status
+internal_endgrent (ent_t *ent)
+{
+ if (ent->stream != NULL)
+ {
+ fclose (ent->stream);
+ ent->stream = NULL;
+ }
+
+ if (ent->blacklist.data != NULL)
+ {
+ ent->blacklist.current = 1;
+ ent->blacklist.data[0] = '|';
+ ent->blacklist.data[1] = '\0';
+ }
+ else
+ ent->blacklist.current = 0;
+
+ return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status
+_nss_compat_endgrent (void)
+{
+ enum nss_status result;
+
+ __libc_lock_lock (lock);
+
+ if (nss_endgrent)
+ nss_endgrent ();
+
+ result = internal_endgrent (&ext_ent);
+
+ __libc_lock_unlock (lock);
+
+ return result;
+}
+
+/* get the next group from NSS (+ entry) */
+static enum nss_status
+getgrent_next_nss (struct group *result, ent_t *ent, char *buffer,
+ size_t buflen, int *errnop)
+{
+ if (!nss_getgrent_r)
+ return NSS_STATUS_UNAVAIL;
+
+ /* If the setgrent call failed, say so. */
+ if (ent->setent_status != NSS_STATUS_SUCCESS)
+ return ent->setent_status;
+
+ do
+ {
+ enum nss_status status;
+
+ if ((status = nss_getgrent_r (result, buffer, buflen, errnop)) !=
+ NSS_STATUS_SUCCESS)
+ return status;
+ }
+ while (in_blacklist (result->gr_name, strlen (result->gr_name), ent));
+
+ return NSS_STATUS_SUCCESS;
+}
+
+/* This function handle the +group entrys in /etc/group */
+static enum nss_status
+getgrnam_plusgroup (const char *name, struct group *result, ent_t *ent,
+ char *buffer, size_t buflen, int *errnop)
+{
+ if (!nss_getgrnam_r)
+ return NSS_STATUS_UNAVAIL;
+
+ enum nss_status status = nss_getgrnam_r (name, result, buffer, buflen,
+ errnop);
+ if (status != NSS_STATUS_SUCCESS)
+ return status;
+
+ if (in_blacklist (result->gr_name, strlen (result->gr_name), ent))
+ return NSS_STATUS_NOTFOUND;
+
+ /* We found the entry. */
+ return NSS_STATUS_SUCCESS;
+}
+
+static enum nss_status
+getgrent_next_file (struct group *result, ent_t *ent,
+ char *buffer, size_t buflen, int *errnop)
+{
+ struct parser_data *data = (void *) buffer;
+ while (1)
+ {
+ fpos_t pos;
+ int parse_res = 0;
+ char *p;
+
+ do
+ {
+ /* We need at least 3 characters for one line. */
+ if (__glibc_unlikely (buflen < 3))
+ {
+ erange:
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ fgetpos (ent->stream, &pos);
+ buffer[buflen - 1] = '\xff';
+ p = fgets_unlocked (buffer, buflen, ent->stream);
+ if (p == NULL && feof_unlocked (ent->stream))
+ return NSS_STATUS_NOTFOUND;
+
+ if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
+ {
+ erange_reset:
+ fsetpos (ent->stream, &pos);
+ goto erange;
+ }
+
+ /* Terminate the line for any case. */
+ buffer[buflen - 1] = '\0';
+
+ /* Skip leading blanks. */
+ while (isspace (*p))
+ ++p;
+ }
+ while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
+ /* Parse the line. If it is invalid, loop to
+ get the next line of the file to parse. */
+ !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
+ errnop)));
+
+ if (__glibc_unlikely (parse_res == -1))
+ /* The parser ran out of space. */
+ goto erange_reset;
+
+ if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
+ /* This is a real entry. */
+ break;
+
+ /* -group */
+ if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
+ && result->gr_name[1] != '@')
+ {
+ blacklist_store_name (&result->gr_name[1], ent);
+ continue;
+ }
+
+ /* +group */
+ if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
+ && result->gr_name[1] != '@')
+ {
+ size_t len = strlen (result->gr_name);
+ char buf[len];
+ enum nss_status status;
+
+ /* Store the group in the blacklist for the "+" at the end of
+ /etc/group */
+ memcpy (buf, &result->gr_name[1], len);
+ status = getgrnam_plusgroup (&result->gr_name[1], result, ent,
+ buffer, buflen, errnop);
+ blacklist_store_name (buf, ent);
+ if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
+ break;
+ else if (status == NSS_STATUS_RETURN /* We couldn't parse the entry*/
+ || status == NSS_STATUS_NOTFOUND) /* No group in NIS */
+ continue;
+ else
+ {
+ if (status == NSS_STATUS_TRYAGAIN)
+ /* The parser ran out of space. */
+ goto erange_reset;
+
+ return status;
+ }
+ }
+
+ /* +:... */
+ if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
+ {
+ ent->files = false;
+
+ return getgrent_next_nss (result, ent, buffer, buflen, errnop);
+ }
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
+
+
+enum nss_status
+_nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen,
+ int *errnop)
+{
+ enum nss_status result = NSS_STATUS_SUCCESS;
+
+ __libc_lock_lock (lock);
+
+ /* Be prepared that the setgrent function was not called before. */
+ if (ni == NULL)
+ init_nss_interface ();
+
+ if (ext_ent.stream == NULL)
+ result = internal_setgrent (&ext_ent, 1, 1);
+
+ if (result == NSS_STATUS_SUCCESS)
+ {
+ if (ext_ent.files)
+ result = getgrent_next_file (grp, &ext_ent, buffer, buflen, errnop);
+ else
+ result = getgrent_next_nss (grp, &ext_ent, buffer, buflen, errnop);
+ }
+ __libc_lock_unlock (lock);
+
+ return result;
+}
+
+/* Searches in /etc/group and the NIS/NIS+ map for a special group */
+static enum nss_status
+internal_getgrnam_r (const char *name, struct group *result, ent_t *ent,
+ char *buffer, size_t buflen, int *errnop)
+{
+ struct parser_data *data = (void *) buffer;
+ while (1)
+ {
+ fpos_t pos;
+ int parse_res = 0;
+ char *p;
+
+ do
+ {
+ /* We need at least 3 characters for one line. */
+ if (__glibc_unlikely (buflen < 3))
+ {
+ erange:
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ fgetpos (ent->stream, &pos);
+ buffer[buflen - 1] = '\xff';
+ p = fgets_unlocked (buffer, buflen, ent->stream);
+ if (p == NULL && feof_unlocked (ent->stream))
+ return NSS_STATUS_NOTFOUND;
+
+ if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
+ {
+ erange_reset:
+ fsetpos (ent->stream, &pos);
+ goto erange;
+ }
+
+ /* Terminate the line for any case. */
+ buffer[buflen - 1] = '\0';
+
+ /* Skip leading blanks. */
+ while (isspace (*p))
+ ++p;
+ }
+ while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
+ /* Parse the line. If it is invalid, loop to
+ get the next line of the file to parse. */
+ !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
+ errnop)));
+
+ if (__glibc_unlikely (parse_res == -1))
+ /* The parser ran out of space. */
+ goto erange_reset;
+
+ /* This is a real entry. */
+ if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
+ {
+ if (strcmp (result->gr_name, name) == 0)
+ return NSS_STATUS_SUCCESS;
+ else
+ continue;
+ }
+
+ /* -group */
+ if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
+ {
+ if (strcmp (&result->gr_name[1], name) == 0)
+ return NSS_STATUS_NOTFOUND;
+ else
+ continue;
+ }
+
+ /* +group */
+ if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
+ {
+ if (strcmp (name, &result->gr_name[1]) == 0)
+ {
+ enum nss_status status;
+
+ status = getgrnam_plusgroup (name, result, ent,
+ buffer, buflen, errnop);
+ if (status == NSS_STATUS_RETURN)
+ /* We couldn't parse the entry */
+ continue;
+ else
+ return status;
+ }
+ }
+ /* +:... */
+ if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
+ {
+ enum nss_status status;
+
+ status = getgrnam_plusgroup (name, result, ent,
+ buffer, buflen, errnop);
+ if (status == NSS_STATUS_RETURN)
+ /* We couldn't parse the entry */
+ continue;
+ else
+ return status;
+ }
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status
+_nss_compat_getgrnam_r (const char *name, struct group *grp,
+ char *buffer, size_t buflen, int *errnop)
+{
+ ent_t ent = { true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
+ enum nss_status result;
+
+ if (name[0] == '-' || name[0] == '+')
+ return NSS_STATUS_NOTFOUND;
+
+ __libc_lock_lock (lock);
+
+ if (ni == NULL)
+ init_nss_interface ();
+
+ __libc_lock_unlock (lock);
+
+ result = internal_setgrent (&ent, 0, 0);
+
+ if (result == NSS_STATUS_SUCCESS)
+ result = internal_getgrnam_r (name, grp, &ent, buffer, buflen, errnop);
+
+ internal_endgrent (&ent);
+
+ return result;
+}
+
+/* Searches in /etc/group and the NIS/NIS+ map for a special group id */
+static enum nss_status
+internal_getgrgid_r (gid_t gid, struct group *result, ent_t *ent,
+ char *buffer, size_t buflen, int *errnop)
+{
+ struct parser_data *data = (void *) buffer;
+ while (1)
+ {
+ fpos_t pos;
+ int parse_res = 0;
+ char *p;
+
+ do
+ {
+ /* We need at least 3 characters for one line. */
+ if (__glibc_unlikely (buflen < 3))
+ {
+ erange:
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ fgetpos (ent->stream, &pos);
+ buffer[buflen - 1] = '\xff';
+ p = fgets_unlocked (buffer, buflen, ent->stream);
+ if (p == NULL && feof_unlocked (ent->stream))
+ return NSS_STATUS_NOTFOUND;
+
+ if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
+ {
+ erange_reset:
+ fsetpos (ent->stream, &pos);
+ goto erange;
+ }
+
+ /* Terminate the line for any case. */
+ buffer[buflen - 1] = '\0';
+
+ /* Skip leading blanks. */
+ while (isspace (*p))
+ ++p;
+ }
+ while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
+ /* Parse the line. If it is invalid, loop to
+ get the next line of the file to parse. */
+ !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
+ errnop)));
+
+ if (__glibc_unlikely (parse_res == -1))
+ /* The parser ran out of space. */
+ goto erange_reset;
+
+ /* This is a real entry. */
+ if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
+ {
+ if (result->gr_gid == gid)
+ return NSS_STATUS_SUCCESS;
+ else
+ continue;
+ }
+
+ /* -group */
+ if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
+ {
+ blacklist_store_name (&result->gr_name[1], ent);
+ continue;
+ }
+
+ /* +group */
+ if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
+ {
+ /* Yes, no +1, see the memcpy call below. */
+ size_t len = strlen (result->gr_name);
+ char buf[len];
+ enum nss_status status;
+
+ /* Store the group in the blacklist for the "+" at the end of
+ /etc/group */
+ memcpy (buf, &result->gr_name[1], len);
+ status = getgrnam_plusgroup (&result->gr_name[1], result, ent,
+ buffer, buflen, errnop);
+ blacklist_store_name (buf, ent);
+ if (status == NSS_STATUS_SUCCESS && result->gr_gid == gid)
+ break;
+ else
+ continue;
+ }
+ /* +:... */
+ if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
+ {
+ if (!nss_getgrgid_r)
+ return NSS_STATUS_UNAVAIL;
+
+ enum nss_status status = nss_getgrgid_r (gid, result, buffer, buflen,
+ errnop);
+ if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */
+ return NSS_STATUS_NOTFOUND;
+ else
+ return status;
+ }
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status
+_nss_compat_getgrgid_r (gid_t gid, struct group *grp,
+ char *buffer, size_t buflen, int *errnop)
+{
+ ent_t ent = { true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
+ enum nss_status result;
+
+ __libc_lock_lock (lock);
+
+ if (ni == NULL)
+ init_nss_interface ();
+
+ __libc_lock_unlock (lock);
+
+ result = internal_setgrent (&ent, 0, 0);
+
+ if (result == NSS_STATUS_SUCCESS)
+ result = internal_getgrgid_r (gid, grp, &ent, buffer, buflen, errnop);
+
+ internal_endgrent (&ent);
+
+ return result;
+}
+
+
+/* Support routines for remembering -@netgroup and -user entries.
+ The names are stored in a single string with `|' as separator. */
+static void
+blacklist_store_name (const char *name, ent_t *ent)
+{
+ int namelen = strlen (name);
+ char *tmp;
+
+ /* first call, setup cache */
+ if (ent->blacklist.size == 0)
+ {
+ ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
+ ent->blacklist.data = malloc (ent->blacklist.size);
+ if (ent->blacklist.data == NULL)
+ return;
+ ent->blacklist.data[0] = '|';
+ ent->blacklist.data[1] = '\0';
+ ent->blacklist.current = 1;
+ }
+ else
+ {
+ if (in_blacklist (name, namelen, ent))
+ return; /* no duplicates */
+
+ if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
+ {
+ ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
+ tmp = realloc (ent->blacklist.data, ent->blacklist.size);
+ if (tmp == NULL)
+ {
+ free (ent->blacklist.data);
+ ent->blacklist.size = 0;
+ return;
+ }
+ ent->blacklist.data = tmp;
+ }
+ }
+
+ tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
+ *tmp++ = '|';
+ *tmp = '\0';
+ ent->blacklist.current += namelen + 1;
+
+ return;
+}
+
+/* Return whether ent->blacklist contains name. */
+static bool
+in_blacklist (const char *name, int namelen, ent_t *ent)
+{
+ char buf[namelen + 3];
+ char *cp;
+
+ if (ent->blacklist.data == NULL)
+ return false;
+
+ buf[0] = '|';
+ cp = stpcpy (&buf[1], name);
+ *cp++ = '|';
+ *cp = '\0';
+ return strstr (ent->blacklist.data, buf) != NULL;
+}
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