diff options
Diffstat (limited to 'nss/nss_compat/compat-pwd.c')
| -rw-r--r-- | nss/nss_compat/compat-pwd.c | 1131 |
1 files changed, 1131 insertions, 0 deletions
diff --git a/nss/nss_compat/compat-pwd.c b/nss/nss_compat/compat-pwd.c new file mode 100644 index 0000000000..b16eef5d44 --- /dev/null +++ b/nss/nss_compat/compat-pwd.c @@ -0,0 +1,1131 @@ +/* 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 <pwd.h> +#include <stdio_ext.h> +#include <string.h> +#include <libc-lock.h> +#include <kernel-features.h> + +#include "netgroup.h" +#include "nisdomain.h" + +static service_user *ni; +static enum nss_status (*nss_setpwent) (int stayopen); +static enum nss_status (*nss_getpwnam_r) (const char *name, + struct passwd * pwd, char *buffer, + size_t buflen, int *errnop); +static enum nss_status (*nss_getpwuid_r) (uid_t uid, struct passwd * pwd, + char *buffer, size_t buflen, + int *errnop); +static enum nss_status (*nss_getpwent_r) (struct passwd * pwd, char *buffer, + size_t buflen, int *errnop); +static enum nss_status (*nss_endpwent) (void); + +/* Get the declaration of the parser function. */ +#define ENTNAME pwent +#define STRUCTURE passwd +#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 first; + bool files; + enum nss_status setent_status; + FILE *stream; + struct blacklist_t blacklist; + struct passwd pwd; + struct __netgrent netgrdata; +}; +typedef struct ent_t ent_t; + +static ent_t ext_ent = { false, false, true, NSS_STATUS_SUCCESS, NULL, + { NULL, 0, 0 }, + { NULL, NULL, 0, 0, NULL, NULL, NULL }}; + +/* 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 ("passwd_compat", NULL, "nis", &ni) >= 0) + { + nss_setpwent = __nss_lookup_function (ni, "setpwent"); + nss_getpwnam_r = __nss_lookup_function (ni, "getpwnam_r"); + nss_getpwuid_r = __nss_lookup_function (ni, "getpwuid_r"); + nss_getpwent_r = __nss_lookup_function (ni, "getpwent_r"); + nss_endpwent = __nss_lookup_function (ni, "endpwent"); + } +} + +static void +give_pwd_free (struct passwd *pwd) +{ + free (pwd->pw_name); + free (pwd->pw_passwd); + free (pwd->pw_gecos); + free (pwd->pw_dir); + free (pwd->pw_shell); + + memset (pwd, '\0', sizeof (struct passwd)); +} + +static size_t +pwd_need_buflen (struct passwd *pwd) +{ + size_t len = 0; + + if (pwd->pw_passwd != NULL) + len += strlen (pwd->pw_passwd) + 1; + + if (pwd->pw_gecos != NULL) + len += strlen (pwd->pw_gecos) + 1; + + if (pwd->pw_dir != NULL) + len += strlen (pwd->pw_dir) + 1; + + if (pwd->pw_shell != NULL) + len += strlen (pwd->pw_shell) + 1; + + return len; +} + +static void +copy_pwd_changes (struct passwd *dest, struct passwd *src, + char *buffer, size_t buflen) +{ + if (src->pw_passwd != NULL && strlen (src->pw_passwd)) + { + if (buffer == NULL) + dest->pw_passwd = strdup (src->pw_passwd); + else if (dest->pw_passwd && + strlen (dest->pw_passwd) >= strlen (src->pw_passwd)) + strcpy (dest->pw_passwd, src->pw_passwd); + else + { + dest->pw_passwd = buffer; + strcpy (dest->pw_passwd, src->pw_passwd); + buffer += strlen (dest->pw_passwd) + 1; + buflen = buflen - (strlen (dest->pw_passwd) + 1); + } + } + + if (src->pw_gecos != NULL && strlen (src->pw_gecos)) + { + if (buffer == NULL) + dest->pw_gecos = strdup (src->pw_gecos); + else if (dest->pw_gecos && + strlen (dest->pw_gecos) >= strlen (src->pw_gecos)) + strcpy (dest->pw_gecos, src->pw_gecos); + else + { + dest->pw_gecos = buffer; + strcpy (dest->pw_gecos, src->pw_gecos); + buffer += strlen (dest->pw_gecos) + 1; + buflen = buflen - (strlen (dest->pw_gecos) + 1); + } + } + if (src->pw_dir != NULL && strlen (src->pw_dir)) + { + if (buffer == NULL) + dest->pw_dir = strdup (src->pw_dir); + else if (dest->pw_dir && strlen (dest->pw_dir) >= strlen (src->pw_dir)) + strcpy (dest->pw_dir, src->pw_dir); + else + { + dest->pw_dir = buffer; + strcpy (dest->pw_dir, src->pw_dir); + buffer += strlen (dest->pw_dir) + 1; + buflen = buflen - (strlen (dest->pw_dir) + 1); + } + } + + if (src->pw_shell != NULL && strlen (src->pw_shell)) + { + if (buffer == NULL) + dest->pw_shell = strdup (src->pw_shell); + else if (dest->pw_shell && + strlen (dest->pw_shell) >= strlen (src->pw_shell)) + strcpy (dest->pw_shell, src->pw_shell); + else + { + dest->pw_shell = buffer; + strcpy (dest->pw_shell, src->pw_shell); + buffer += strlen (dest->pw_shell) + 1; + buflen = buflen - (strlen (dest->pw_shell) + 1); + } + } +} + +static enum nss_status +internal_setpwent (ent_t *ent, int stayopen, int needent) +{ + enum nss_status status = NSS_STATUS_SUCCESS; + + ent->first = ent->netgroup = false; + ent->files = true; + ent->setent_status = NSS_STATUS_SUCCESS; + + /* 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/passwd", "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_pwd_free (&ent->pwd); + + if (needent && status == NSS_STATUS_SUCCESS && nss_setpwent) + ent->setent_status = nss_setpwent (stayopen); + + return status; +} + + +enum nss_status +_nss_compat_setpwent (int stayopen) +{ + enum nss_status result; + + __libc_lock_lock (lock); + + if (ni == NULL) + init_nss_interface (); + + result = internal_setpwent (&ext_ent, stayopen, 1); + + __libc_lock_unlock (lock); + + return result; +} + + +static enum nss_status +internal_endpwent (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; + + if (ent->blacklist.data != NULL) + { + ent->blacklist.current = 1; + ent->blacklist.data[0] = '|'; + ent->blacklist.data[1] = '\0'; + } + else + ent->blacklist.current = 0; + + give_pwd_free (&ent->pwd); + + return NSS_STATUS_SUCCESS; +} + +enum nss_status +_nss_compat_endpwent (void) +{ + enum nss_status result; + + __libc_lock_lock (lock); + + if (nss_endpwent) + nss_endpwent (); + + result = internal_endpwent (&ext_ent); + + __libc_lock_unlock (lock); + + return result; +} + + +static enum nss_status +getpwent_next_nss_netgr (const char *name, struct passwd *result, ent_t *ent, + char *group, char *buffer, size_t buflen, + int *errnop) +{ + char *curdomain = NULL, *host, *user, *domain, *p2; + int status; + size_t p2len; + + /* Leave function if NSS module does not support getpwnam_r, + we need this function here. */ + if (!nss_getpwnam_r) + return NSS_STATUS_UNAVAIL; + + if (ent->first) + { + memset (&ent->netgrdata, 0, sizeof (struct __netgrent)); + __internal_setnetgrent (group, &ent->netgrdata); + ent->first = false; + } + + while (1) + { + status = __internal_getnetgrent_r (&host, &user, &domain, + &ent->netgrdata, buffer, buflen, + errnop); + if (status != 1) + { + __internal_endnetgrent (&ent->netgrdata); + ent->netgroup = 0; + give_pwd_free (&ent->pwd); + return NSS_STATUS_RETURN; + } + + if (user == NULL || user[0] == '-') + continue; + + if (domain != NULL) + { + if (curdomain == NULL + && __nss_get_default_domain (&curdomain) != 0) + { + __internal_endnetgrent (&ent->netgrdata); + ent->netgroup = false; + give_pwd_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 = pwd_need_buflen (&ent->pwd); + if (p2len > buflen) + { + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + p2 = buffer + (buflen - p2len); + buflen -= p2len; + + if (nss_getpwnam_r (user, result, buffer, buflen, errnop) != + NSS_STATUS_SUCCESS) + continue; + + if (!in_blacklist (result->pw_name, strlen (result->pw_name), ent)) + { + /* Store the User in the blacklist for possible the "+" at the + end of /etc/passwd */ + blacklist_store_name (result->pw_name, ent); + copy_pwd_changes (result, &ent->pwd, p2, p2len); + break; + } + } + + return NSS_STATUS_SUCCESS; +} + +/* get the next user from NSS (+ entry) */ +static enum nss_status +getpwent_next_nss (struct passwd *result, ent_t *ent, char *buffer, + size_t buflen, int *errnop) +{ + enum nss_status status; + char *p2; + size_t p2len; + + /* Return if NSS module does not support getpwent_r. */ + if (!nss_getpwent_r) + return NSS_STATUS_UNAVAIL; + + /* If the setpwent call failed, say so. */ + if (ent->setent_status != NSS_STATUS_SUCCESS) + return ent->setent_status; + + p2len = pwd_need_buflen (&ent->pwd); + if (p2len > buflen) + { + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + p2 = buffer + (buflen - p2len); + buflen -= p2len; + + if (ent->first) + ent->first = false; + + do + { + if ((status = nss_getpwent_r (result, buffer, buflen, errnop)) != + NSS_STATUS_SUCCESS) + return status; + } + while (in_blacklist (result->pw_name, strlen (result->pw_name), ent)); + + copy_pwd_changes (result, &ent->pwd, p2, p2len); + + return NSS_STATUS_SUCCESS; +} + +/* This function handle the +user entrys in /etc/passwd */ +static enum nss_status +getpwnam_plususer (const char *name, struct passwd *result, ent_t *ent, + char *buffer, size_t buflen, int *errnop) +{ + if (!nss_getpwnam_r) + return NSS_STATUS_UNAVAIL; + + struct passwd pwd; + memset (&pwd, '\0', sizeof (struct passwd)); + + copy_pwd_changes (&pwd, result, NULL, 0); + + size_t plen = pwd_need_buflen (&pwd); + if (plen > buflen) + { + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + char *p = buffer + (buflen - plen); + buflen -= plen; + + enum nss_status status = nss_getpwnam_r (name, result, buffer, buflen, + errnop); + if (status != NSS_STATUS_SUCCESS) + return status; + + if (in_blacklist (result->pw_name, strlen (result->pw_name), ent)) + return NSS_STATUS_NOTFOUND; + + copy_pwd_changes (result, &pwd, p, plen); + give_pwd_free (&pwd); + /* We found the entry. */ + return NSS_STATUS_SUCCESS; +} + +static enum nss_status +getpwent_next_file (struct passwd *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 || __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_pwent (p, result, data, buflen, + errnop))); + + if (__glibc_unlikely (parse_res == -1)) + /* The parser ran out of space. */ + goto erange_reset; + + if (result->pw_name[0] != '+' && result->pw_name[0] != '-') + /* This is a real entry. */ + break; + + /* -@netgroup */ + if (result->pw_name[0] == '-' && result->pw_name[1] == '@' + && result->pw_name[2] != '\0') + { + /* XXX Do not use fixed length buffer. */ + char buf2[1024]; + char *user, *host, *domain; + struct __netgrent netgrdata; + + memset (&netgrdata, 0, sizeof (struct __netgrent)); + __internal_setnetgrent (&result->pw_name[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->pw_name[0] == '+' && result->pw_name[1] == '@' + && result->pw_name[2] != '\0') + { + enum nss_status status; + + ent->netgroup = true; + ent->first = true; + copy_pwd_changes (&ent->pwd, result, NULL, 0); + + status = getpwent_next_nss_netgr (NULL, result, ent, + &result->pw_name[2], + buffer, buflen, errnop); + if (status == NSS_STATUS_RETURN) + continue; + else + return status; + } + + /* -user */ + if (result->pw_name[0] == '-' && result->pw_name[1] != '\0' + && result->pw_name[1] != '@') + { + blacklist_store_name (&result->pw_name[1], ent); + continue; + } + + /* +user */ + if (result->pw_name[0] == '+' && result->pw_name[1] != '\0' + && result->pw_name[1] != '@') + { + size_t len = strlen (result->pw_name); + char buf[len]; + enum nss_status status; + + /* Store the User in the blacklist for the "+" at the end of + /etc/passwd */ + memcpy (buf, &result->pw_name[1], len); + status = getpwnam_plususer (&result->pw_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) /* entry doesn't exist */ + continue; + else + { + if (status == NSS_STATUS_TRYAGAIN) + { + /* The parser ran out of space */ + fsetpos (ent->stream, &pos); + *errnop = ERANGE; + } + return status; + } + } + + /* +:... */ + if (result->pw_name[0] == '+' && result->pw_name[1] == '\0') + { + ent->files = false; + ent->first = true; + copy_pwd_changes (&ent->pwd, result, NULL, 0); + + return getpwent_next_nss (result, ent, buffer, buflen, errnop); + } + } + + return NSS_STATUS_SUCCESS; +} + + +static enum nss_status +internal_getpwent_r (struct passwd *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 = getpwent_next_nss_netgr (NULL, pw, ent, NULL, buffer, buflen, + errnop); + if (status == NSS_STATUS_RETURN) + return getpwent_next_file (pw, ent, buffer, buflen, errnop); + else + return status; + } + else if (ent->files) + return getpwent_next_file (pw, ent, buffer, buflen, errnop); + else + return getpwent_next_nss (pw, ent, buffer, buflen, errnop); + +} + +enum nss_status +_nss_compat_getpwent_r (struct passwd *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_setpwent (&ext_ent, 1, 1); + + if (result == NSS_STATUS_SUCCESS) + result = internal_getpwent_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_getpwnam_r (const char *name, struct passwd *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 || __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_pwent (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->pw_name[0] != '+' && result->pw_name[0] != '-') + { + if (strcmp (result->pw_name, name) == 0) + return NSS_STATUS_SUCCESS; + else + continue; + } + + /* -@netgroup */ + if (result->pw_name[0] == '-' && result->pw_name[1] == '@' + && result->pw_name[2] != '\0') + { + if (innetgr (&result->pw_name[2], NULL, name, NULL)) + return NSS_STATUS_NOTFOUND; + continue; + } + + /* +@netgroup */ + if (result->pw_name[0] == '+' && result->pw_name[1] == '@' + && result->pw_name[2] != '\0') + { + enum nss_status status; + + if (innetgr (&result->pw_name[2], NULL, name, NULL)) + { + status = getpwnam_plususer (name, result, ent, buffer, + buflen, errnop); + + if (status == NSS_STATUS_RETURN) + continue; + + return status; + } + continue; + } + + /* -user */ + if (result->pw_name[0] == '-' && result->pw_name[1] != '\0' + && result->pw_name[1] != '@') + { + if (strcmp (&result->pw_name[1], name) == 0) + return NSS_STATUS_NOTFOUND; + else + continue; + } + + /* +user */ + if (result->pw_name[0] == '+' && result->pw_name[1] != '\0' + && result->pw_name[1] != '@') + { + if (strcmp (name, &result->pw_name[1]) == 0) + { + enum nss_status status; + + status = getpwnam_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->pw_name[0] == '+' && result->pw_name[1] == '\0') + { + enum nss_status status; + + status = getpwnam_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_getpwnam_r (const char *name, struct passwd *pwd, + char *buffer, size_t buflen, int *errnop) +{ + enum nss_status result; + ent_t ent = { false, false, true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }, + { NULL, NULL, 0, 0, NULL, NULL, NULL }}; + + 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_setpwent (&ent, 0, 0); + + if (result == NSS_STATUS_SUCCESS) + result = internal_getpwnam_r (name, pwd, &ent, buffer, buflen, errnop); + + internal_endpwent (&ent); + + return result; +} + +/* This function handle the + entry in /etc/passwd for getpwuid */ +static enum nss_status +getpwuid_plususer (uid_t uid, struct passwd *result, char *buffer, + size_t buflen, int *errnop) +{ + struct passwd pwd; + char *p; + size_t plen; + + if (!nss_getpwuid_r) + return NSS_STATUS_UNAVAIL; + + memset (&pwd, '\0', sizeof (struct passwd)); + + copy_pwd_changes (&pwd, result, NULL, 0); + + plen = pwd_need_buflen (&pwd); + if (plen > buflen) + { + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + p = buffer + (buflen - plen); + buflen -= plen; + + if (nss_getpwuid_r (uid, result, buffer, buflen, errnop) == + NSS_STATUS_SUCCESS) + { + copy_pwd_changes (result, &pwd, p, plen); + give_pwd_free (&pwd); + /* We found the entry. */ + return NSS_STATUS_SUCCESS; + } + else + { + /* Give buffer the old len back */ + buflen += plen; + give_pwd_free (&pwd); + } + return NSS_STATUS_RETURN; +} + +/* Searches in /etc/passwd and the NSS subsystem for a special user id */ +static enum nss_status +internal_getpwuid_r (uid_t uid, struct passwd *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 || __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_pwent (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->pw_name[0] != '+' && result->pw_name[0] != '-') + { + if (result->pw_uid == uid) + return NSS_STATUS_SUCCESS; + else + continue; + } + + /* -@netgroup */ + if (result->pw_name[0] == '-' && result->pw_name[1] == '@' + && result->pw_name[2] != '\0') + { + /* -1, because we remove first two character of pw_name. */ + size_t len = strlen (result->pw_name) - 1; + char buf[len]; + enum nss_status status; + + memcpy (buf, &result->pw_name[2], len); + + status = getpwuid_plususer (uid, result, buffer, buflen, errnop); + if (status == NSS_STATUS_SUCCESS && + innetgr (buf, NULL, result->pw_name, NULL)) + return NSS_STATUS_NOTFOUND; + + continue; + } + + /* +@netgroup */ + if (result->pw_name[0] == '+' && result->pw_name[1] == '@' + && result->pw_name[2] != '\0') + { + /* -1, because we remove first two characters of pw_name. */ + size_t len = strlen (result->pw_name) - 1; + char buf[len]; + enum nss_status status; + + memcpy (buf, &result->pw_name[2], len); + + status = getpwuid_plususer (uid, result, buffer, buflen, errnop); + + if (status == NSS_STATUS_RETURN) + continue; + + if (status == NSS_STATUS_SUCCESS) + { + if (innetgr (buf, NULL, result->pw_name, NULL)) + return NSS_STATUS_SUCCESS; + } + else if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */ + return NSS_STATUS_NOTFOUND; + else + return status; + + continue; + } + + /* -user */ + if (result->pw_name[0] == '-' && result->pw_name[1] != '\0' + && result->pw_name[1] != '@') + { + size_t len = strlen (result->pw_name); + char buf[len]; + enum nss_status status; + + memcpy (buf, &result->pw_name[1], len); + + status = getpwuid_plususer (uid, result, buffer, buflen, errnop); + if (status == NSS_STATUS_SUCCESS && + innetgr (buf, NULL, result->pw_name, NULL)) + return NSS_STATUS_NOTFOUND; + continue; + } + + /* +user */ + if (result->pw_name[0] == '+' && result->pw_name[1] != '\0' + && result->pw_name[1] != '@') + { + size_t len = strlen (result->pw_name); + char buf[len]; + enum nss_status status; + + memcpy (buf, &result->pw_name[1], len); + + status = getpwuid_plususer (uid, result, buffer, buflen, errnop); + + if (status == NSS_STATUS_RETURN) + continue; + + if (status == NSS_STATUS_SUCCESS) + { + if (strcmp (buf, result->pw_name) == 0) + return NSS_STATUS_SUCCESS; + } + else if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */ + return NSS_STATUS_NOTFOUND; + else + return status; + + continue; + } + + /* +:... */ + if (result->pw_name[0] == '+' && result->pw_name[1] == '\0') + { + enum nss_status status; + + status = getpwuid_plususer (uid, result, 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_getpwuid_r (uid_t uid, struct passwd *pwd, + char *buffer, size_t buflen, int *errnop) +{ + enum nss_status result; + ent_t ent = { false, false, true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }, + { NULL, NULL, 0, 0, NULL, NULL, NULL }}; + + __libc_lock_lock (lock); + + if (ni == NULL) + init_nss_interface (); + + __libc_lock_unlock (lock); + + result = internal_setpwent (&ent, 0, 0); + + if (result == NSS_STATUS_SUCCESS) + result = internal_getpwuid_r (uid, pwd, &ent, buffer, buflen, errnop); + + internal_endpwent (&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 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; +} |