diff options
Diffstat (limited to 'nis/nss_compat/compat-spwd.c')
| -rw-r--r-- | nis/nss_compat/compat-spwd.c | 858 |
1 files changed, 0 insertions, 858 deletions
diff --git a/nis/nss_compat/compat-spwd.c b/nis/nss_compat/compat-spwd.c deleted file mode 100644 index eec3af3d15..0000000000 --- a/nis/nss_compat/compat-spwd.c +++ /dev/null @@ -1,858 +0,0 @@ -/* Copyright (C) 1996-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.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 <netdb.h> -#include <nss.h> -#include <nsswitch.h> -#include <shadow.h> -#include <stdio_ext.h> -#include <string.h> -#include <rpc/types.h> -#include <rpcsvc/ypclnt.h> -#include <libc-lock.h> -#include <kernel-features.h> - -#include "netgroup.h" - -static service_user *ni; -static enum nss_status (*nss_setspent) (int stayopen); -static enum nss_status (*nss_getspnam_r) (const char *name, struct spwd * sp, - char *buffer, size_t buflen, - int *errnop); -static enum nss_status (*nss_getspent_r) (struct spwd * sp, char *buffer, - size_t buflen, int *errnop); -static enum nss_status (*nss_endspent) (void); - -/* Get the declaration of the parser function. */ -#define ENTNAME spent -#define STRUCTURE spwd -#define EXTERN_PARSER -#include <nss/nss_files/files-parse.c> - -/* Structure for remembering -@netgroup and -user members ... */ -#define BLACKLIST_INITIAL_SIZE 512 -#define BLACKLIST_INCREMENT 256 -struct blacklist_t -{ - char *data; - int current; - int size; -}; - -struct ent_t -{ - bool netgroup; - bool files; - bool first; - enum nss_status setent_status; - FILE *stream; - struct blacklist_t blacklist; - struct spwd pwd; - struct __netgrent netgrdata; -}; -typedef struct ent_t ent_t; - -static ent_t ext_ent = { false, true, false, NSS_STATUS_SUCCESS, NULL, - { NULL, 0, 0}, - { NULL, NULL, 0, 0, 0, 0, 0, 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 int 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 ("shadow_compat", "passwd_compat", - "nis", &ni) >= 0) - { - nss_setspent = __nss_lookup_function (ni, "setspent"); - nss_getspnam_r = __nss_lookup_function (ni, "getspnam_r"); - nss_getspent_r = __nss_lookup_function (ni, "getspent_r"); - nss_endspent = __nss_lookup_function (ni, "endspent"); - } -} - -static void -give_spwd_free (struct spwd *pwd) -{ - free (pwd->sp_namp); - free (pwd->sp_pwdp); - - memset (pwd, '\0', sizeof (struct spwd)); - pwd->sp_warn = -1; - pwd->sp_inact = -1; - pwd->sp_expire = -1; - pwd->sp_flag = ~0ul; -} - -static int -spwd_need_buflen (struct spwd *pwd) -{ - int len = 0; - - if (pwd->sp_pwdp != NULL) - len += strlen (pwd->sp_pwdp) + 1; - - return len; -} - -static void -copy_spwd_changes (struct spwd *dest, struct spwd *src, - char *buffer, size_t buflen) -{ - if (src->sp_pwdp != NULL && strlen (src->sp_pwdp)) - { - if (buffer == NULL) - dest->sp_pwdp = strdup (src->sp_pwdp); - else if (dest->sp_pwdp && - strlen (dest->sp_pwdp) >= strlen (src->sp_pwdp)) - strcpy (dest->sp_pwdp, src->sp_pwdp); - else - { - dest->sp_pwdp = buffer; - strcpy (dest->sp_pwdp, src->sp_pwdp); - buffer += strlen (dest->sp_pwdp) + 1; - buflen = buflen - (strlen (dest->sp_pwdp) + 1); - } - } - if (src->sp_lstchg != 0) - dest->sp_lstchg = src->sp_lstchg; - if (src->sp_min != 0) - dest->sp_min = src->sp_min; - if (src->sp_max != 0) - dest->sp_max = src->sp_max; - if (src->sp_warn != -1) - dest->sp_warn = src->sp_warn; - if (src->sp_inact != -1) - dest->sp_inact = src->sp_inact; - if (src->sp_expire != -1) - dest->sp_expire = src->sp_expire; - if (src->sp_flag != ~0ul) - dest->sp_flag = src->sp_flag; -} - -static enum nss_status -internal_setspent (ent_t *ent, int stayopen, int needent) -{ - enum nss_status status = NSS_STATUS_SUCCESS; - - ent->first = ent->netgroup = 0; - ent->files = true; - - /* If something was left over free it. */ - if (ent->netgroup) - __internal_endnetgrent (&ent->netgrdata); - - 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/shadow", "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); - - give_spwd_free (&ent->pwd); - - if (needent && status == NSS_STATUS_SUCCESS && nss_setspent) - ent->setent_status = nss_setspent (stayopen); - - return status; -} - - -enum nss_status -_nss_compat_setspent (int stayopen) -{ - enum nss_status result; - - __libc_lock_lock (lock); - - if (ni == NULL) - init_nss_interface (); - - result = internal_setspent (&ext_ent, stayopen, 1); - - __libc_lock_unlock (lock); - - return result; -} - - -static enum nss_status -internal_endspent (ent_t *ent) -{ - if (ent->stream != NULL) - { - fclose (ent->stream); - ent->stream = NULL; - } - - if (ent->netgroup) - __internal_endnetgrent (&ent->netgrdata); - - ent->first = ent->netgroup = false; - 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; - - give_spwd_free (&ent->pwd); - - return NSS_STATUS_SUCCESS; -} - -enum nss_status -_nss_compat_endspent (void) -{ - enum nss_status result; - - __libc_lock_lock (lock); - - if (nss_endspent) - nss_endspent (); - - result = internal_endspent (&ext_ent); - - __libc_lock_unlock (lock); - - return result; -} - - -static enum nss_status -getspent_next_nss_netgr (const char *name, struct spwd *result, ent_t *ent, - char *group, char *buffer, size_t buflen, - int *errnop) -{ - char *curdomain = NULL, *host, *user, *domain, *p2; - size_t p2len; - - if (!nss_getspnam_r) - return NSS_STATUS_UNAVAIL; - - /* If the setpwent call failed, say so. */ - if (ent->setent_status != NSS_STATUS_SUCCESS) - return ent->setent_status; - - if (ent->first) - { - memset (&ent->netgrdata, 0, sizeof (struct __netgrent)); - __internal_setnetgrent (group, &ent->netgrdata); - ent->first = false; - } - - while (1) - { - enum nss_status status; - - status = __internal_getnetgrent_r (&host, &user, &domain, - &ent->netgrdata, buffer, buflen, - errnop); - if (status != 1) - { - __internal_endnetgrent (&ent->netgrdata); - ent->netgroup = false; - give_spwd_free (&ent->pwd); - return NSS_STATUS_RETURN; - } - - if (user == NULL || user[0] == '-') - continue; - - if (domain != NULL) - { - if (curdomain == NULL - && yp_get_default_domain (&curdomain) != YPERR_SUCCESS) - { - __internal_endnetgrent (&ent->netgrdata); - ent->netgroup = false; - give_spwd_free (&ent->pwd); - return NSS_STATUS_UNAVAIL; - } - if (strcmp (curdomain, domain) != 0) - continue; - } - - /* If name != NULL, we are called from getpwnam */ - if (name != NULL) - if (strcmp (user, name) != 0) - continue; - - p2len = spwd_need_buflen (&ent->pwd); - if (p2len > buflen) - { - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } - p2 = buffer + (buflen - p2len); - buflen -= p2len; - - if (nss_getspnam_r (user, result, buffer, buflen, errnop) != - NSS_STATUS_SUCCESS) - continue; - - if (!in_blacklist (result->sp_namp, strlen (result->sp_namp), ent)) - { - /* Store the User in the blacklist for possible the "+" at the - end of /etc/passwd */ - blacklist_store_name (result->sp_namp, ent); - copy_spwd_changes (result, &ent->pwd, p2, p2len); - break; - } - } - - return NSS_STATUS_SUCCESS; -} - - -static enum nss_status -getspent_next_nss (struct spwd *result, ent_t *ent, - char *buffer, size_t buflen, int *errnop) -{ - enum nss_status status; - char *p2; - size_t p2len; - - if (!nss_getspent_r) - return NSS_STATUS_UNAVAIL; - - p2len = spwd_need_buflen (&ent->pwd); - if (p2len > buflen) - { - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } - p2 = buffer + (buflen - p2len); - buflen -= p2len; - do - { - if ((status = nss_getspent_r (result, buffer, buflen, errnop)) != - NSS_STATUS_SUCCESS) - return status; - } - while (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent)); - - copy_spwd_changes (result, &ent->pwd, p2, p2len); - - return NSS_STATUS_SUCCESS; -} - - -/* This function handle the +user entrys in /etc/shadow */ -static enum nss_status -getspnam_plususer (const char *name, struct spwd *result, ent_t *ent, - char *buffer, size_t buflen, int *errnop) -{ - if (!nss_getspnam_r) - return NSS_STATUS_UNAVAIL; - - struct spwd pwd; - memset (&pwd, '\0', sizeof (struct spwd)); - pwd.sp_warn = -1; - pwd.sp_inact = -1; - pwd.sp_expire = -1; - pwd.sp_flag = ~0ul; - - copy_spwd_changes (&pwd, result, NULL, 0); - - size_t plen = spwd_need_buflen (&pwd); - if (plen > buflen) - { - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } - char *p = buffer + (buflen - plen); - buflen -= plen; - - enum nss_status status = nss_getspnam_r (name, result, buffer, buflen, - errnop); - if (status != NSS_STATUS_SUCCESS) - return status; - - if (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent)) - return NSS_STATUS_NOTFOUND; - - copy_spwd_changes (result, &pwd, p, plen); - give_spwd_free (&pwd); - /* We found the entry. */ - return NSS_STATUS_SUCCESS; -} - - -static enum nss_status -getspent_next_file (struct spwd *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; - } - - /* 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_spent (p, result, data, - buflen, errnop))); - - if (__glibc_unlikely (parse_res == -1)) - /* The parser ran out of space. */ - goto erange_reset; - - if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-') - /* This is a real entry. */ - break; - - /* -@netgroup */ - if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@' - && result->sp_namp[2] != '\0') - { - /* XXX Do not use fixed length buffers. */ - char buf2[1024]; - char *user, *host, *domain; - struct __netgrent netgrdata; - - memset (&netgrdata, 0, sizeof (struct __netgrent)); - __internal_setnetgrent (&result->sp_namp[2], &netgrdata); - while (__internal_getnetgrent_r (&host, &user, &domain, - &netgrdata, buf2, sizeof (buf2), - errnop)) - { - if (user != NULL && user[0] != '-') - blacklist_store_name (user, ent); - } - __internal_endnetgrent (&netgrdata); - continue; - } - - /* +@netgroup */ - if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@' - && result->sp_namp[2] != '\0') - { - int status; - - ent->netgroup = true; - ent->first = true; - copy_spwd_changes (&ent->pwd, result, NULL, 0); - - status = getspent_next_nss_netgr (NULL, result, ent, - &result->sp_namp[2], - buffer, buflen, errnop); - if (status == NSS_STATUS_RETURN) - continue; - else - return status; - } - - /* -user */ - if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0' - && result->sp_namp[1] != '@') - { - blacklist_store_name (&result->sp_namp[1], ent); - continue; - } - - /* +user */ - if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0' - && result->sp_namp[1] != '@') - { - size_t len = strlen (result->sp_namp); - char buf[len]; - enum nss_status status; - - /* Store the User in the blacklist for the "+" at the end of - /etc/passwd */ - memcpy (buf, &result->sp_namp[1], len); - status = getspnam_plususer (&result->sp_namp[1], result, ent, - buffer, buflen, errnop); - blacklist_store_name (buf, ent); - - if (status == NSS_STATUS_SUCCESS) /* We found the entry. */ - break; - /* We couldn't parse the entry */ - else if (status == NSS_STATUS_RETURN - /* entry doesn't exist */ - || status == NSS_STATUS_NOTFOUND) - continue; - else - { - if (status == NSS_STATUS_TRYAGAIN) - { - fsetpos (ent->stream, &pos); - *errnop = ERANGE; - } - return status; - } - } - - /* +:... */ - if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0') - { - ent->files = false; - ent->first = true; - copy_spwd_changes (&ent->pwd, result, NULL, 0); - - return getspent_next_nss (result, ent, buffer, buflen, errnop); - } - } - - return NSS_STATUS_SUCCESS; -} - - -static enum nss_status -internal_getspent_r (struct spwd *pw, ent_t *ent, - char *buffer, size_t buflen, int *errnop) -{ - if (ent->netgroup) - { - enum nss_status status; - - /* We are searching members in a netgroup */ - /* Since this is not the first call, we don't need the group name */ - status = getspent_next_nss_netgr (NULL, pw, ent, NULL, buffer, - buflen, errnop); - - if (status == NSS_STATUS_RETURN) - return getspent_next_file (pw, ent, buffer, buflen, errnop); - else - return status; - } - else if (ent->files) - return getspent_next_file (pw, ent, buffer, buflen, errnop); - else - return getspent_next_nss (pw, ent, buffer, buflen, errnop); -} - - -enum nss_status -_nss_compat_getspent_r (struct spwd *pwd, char *buffer, size_t buflen, - int *errnop) -{ - enum nss_status result = NSS_STATUS_SUCCESS; - - __libc_lock_lock (lock); - - /* Be prepared that the setpwent function was not called before. */ - if (ni == NULL) - init_nss_interface (); - - if (ext_ent.stream == NULL) - result = internal_setspent (&ext_ent, 1, 1); - - if (result == NSS_STATUS_SUCCESS) - result = internal_getspent_r (pwd, &ext_ent, buffer, buflen, errnop); - - __libc_lock_unlock (lock); - - return result; -} - - -/* Searches in /etc/passwd and the NIS/NIS+ map for a special user */ -static enum nss_status -internal_getspnam_r (const char *name, struct spwd *result, ent_t *ent, - char *buffer, size_t buflen, int *errnop) -{ - struct parser_data *data = (void *) buffer; - - while (1) - { - fpos_t pos; - char *p; - int parse_res; - - 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 || buffer[buflen - 1] != '\xff') - { - 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_spent (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->sp_namp[0] != '+' && result->sp_namp[0] != '-') - { - if (strcmp (result->sp_namp, name) == 0) - return NSS_STATUS_SUCCESS; - else - continue; - } - - /* -@netgroup */ - /* If the loaded NSS module does not support this service, add - all users from a +@netgroup entry to the blacklist, too. */ - if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@' - && result->sp_namp[2] != '\0') - { - if (innetgr (&result->sp_namp[2], NULL, name, NULL)) - return NSS_STATUS_NOTFOUND; - continue; - } - - /* +@netgroup */ - if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@' - && result->sp_namp[2] != '\0') - { - enum nss_status status; - - if (innetgr (&result->sp_namp[2], NULL, name, NULL)) - { - status = getspnam_plususer (name, result, ent, buffer, - buflen, errnop); - - if (status == NSS_STATUS_RETURN) - continue; - - return status; - } - continue; - } - - /* -user */ - if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0' - && result->sp_namp[1] != '@') - { - if (strcmp (&result->sp_namp[1], name) == 0) - return NSS_STATUS_NOTFOUND; - else - continue; - } - - /* +user */ - if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0' - && result->sp_namp[1] != '@') - { - if (strcmp (name, &result->sp_namp[1]) == 0) - { - enum nss_status status; - - status = getspnam_plususer (name, result, ent, - buffer, buflen, errnop); - - if (status == NSS_STATUS_RETURN) - /* We couldn't parse the entry */ - return NSS_STATUS_NOTFOUND; - else - return status; - } - } - - /* +:... */ - if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0') - { - enum nss_status status; - - status = getspnam_plususer (name, result, ent, - buffer, buflen, errnop); - - if (status == NSS_STATUS_SUCCESS) - /* We found the entry. */ - break; - else 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_getspnam_r (const char *name, struct spwd *pwd, - char *buffer, size_t buflen, int *errnop) -{ - enum nss_status result; - ent_t ent = { false, true, false, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0}, - { NULL, NULL, 0, 0, 0, 0, 0, 0, 0}}; - - 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_setspent (&ent, 0, 0); - - if (result == NSS_STATUS_SUCCESS) - result = internal_getspnam_r (name, pwd, &ent, buffer, buflen, errnop); - - internal_endspent (&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; -} - - -/* Returns TRUE if ent->blacklist contains name, else FALSE. */ -static bool_t -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; -} |