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glibc
glibc-nis-adjunct-as-shadow.diff
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File glibc-nis-adjunct-as-shadow.diff of Package glibc
commit 71170aa0a956c59d8bad0cf6f5ed31d78c90e332 Author: Ulrich Drepper <drepper@redhat.com> Date: Wed Apr 7 07:37:39 2010 -0700 Implement new mode for NIS passwd.adjunct.byname table. The passwd.adjunct.byname table will not be used to fill in password fields in the passwd.byname replies. Instead it is used to synthesize the shadow.byname table, should it be missing. This is a useful mode in some installations involving Solaris. 2010-04-07 Ulrich Drepper <drepper@redhat.com> [BZ #11134] * nis/libnsl.h (NSS_FLAG_ADJUNCT_AS_SHADOW): Define. * nis/nss: Document new ADJUNCT_AS_SHADOW variable. * nis/nss-default.c: Handle ADJUNCT_AS_SHADOW variable. * nis/nss_nis/nis-pwd.c (internal_nis_endpwent): Minor cleanups. (internal_nis_getpwent_r): Don't fill in password from adjunct table if NSS_FLAG_ADJUNCT_AS_SHADOW is set. (_nss_nis_getpwnam_r): Likewise. (_nss_nis_getpwuid_r): Likewise. * nis/nss_nis/nis-spwd.c (ent_adjunct_used): Nee global variable. (_nss_nis_setspent): Also reset ent_adjunct_used. (internal_nis_getspent_r): If new_start is set and shadow.byname table does not exist and NSS_FLAG_ADJUNCT_AS_SHADOW is set, try to get passwd.adjunct.byname table. If new_start is not set get next entry from the initially used table. Synthesize shadow.byname table if necessary by adding two empty fields. (_nss_nis_getspnam_r): If shadow.byname table does not exist and NSS_FLAG_ADJUNCT_AS_SHADOW is set, try to get passwd.adjunct.byname table and synthesize shadow.byname table. Index: glibc-2.9/nis/libnsl.h =================================================================== --- glibc-2.9.orig/nis/libnsl.h +++ glibc-2.9/nis/libnsl.h @@ -21,6 +21,7 @@ #define NSS_FLAG_NETID_AUTHORITATIVE 1 #define NSS_FLAG_SERVICES_AUTHORITATIVE 2 #define NSS_FLAG_SETENT_BATCH_READ 4 +#define NSS_FLAG_ADJUNCT_AS_SHADOW 8 /* Get current set of default flags. */ Index: glibc-2.9/nis/nss =================================================================== --- glibc-2.9.orig/nis/nss +++ glibc-2.9/nis/nss @@ -1,7 +1,7 @@ # /etc/default/nss # This file can theoretically contain a bunch of customization variables # for Name Service Switch in the GNU C library. For now there are only -# three variables: +# four variables: # # NETID_AUTHORITATIVE # If set to TRUE, the initgroups() function will accept the information @@ -26,3 +26,12 @@ # might result into a network communication with the server to get # the next entry. #SETENT_BATCH_READ=TRUE +# +# ADJUNCT_AS_SHADOW +# If set to TRUE, the passwd routines in the NIS NSS module will not +# use the passwd.adjunct.byname tables to fill in the password data +# in the passwd structure. This is a security problem if the NIS +# server cannot be trusted to send the passwd.adjuct table only to +# privileged clients. Instead the passwd.adjunct.byname table is +# used to synthesize the shadow.byname table if it does not exist. +#ADJUNCT_AS_SHADOW=TRUE Index: glibc-2.9/nis/nss-default.c =================================================================== --- glibc-2.9.orig/nis/nss-default.c +++ glibc-2.9/nis/nss-default.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1996, 2001, 2004, 2006, 2007 Free Software Foundation, Inc. +/* Copyright (C) 1996,2001,2004,2006,2007,2010 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -47,7 +47,8 @@ static const struct #define STRNLEN(s) s, sizeof (s) - 1 { STRNLEN ("NETID_AUTHORITATIVE"), NSS_FLAG_NETID_AUTHORITATIVE }, { STRNLEN ("SERVICES_AUTHORITATIVE"), NSS_FLAG_SERVICES_AUTHORITATIVE }, - { STRNLEN ("SETENT_BATCH_READ"), NSS_FLAG_SETENT_BATCH_READ } + { STRNLEN ("SETENT_BATCH_READ"), NSS_FLAG_SETENT_BATCH_READ }, + { STRNLEN ("ADJUNCT_AS_SHADOW"), NSS_FLAG_ADJUNCT_AS_SHADOW }, }; #define nvars (sizeof (vars) / sizeof (vars[0])) Index: glibc-2.9/nis/nss_nis/nis-pwd.c =================================================================== --- glibc-2.9.orig/nis/nss_nis/nis-pwd.c +++ glibc-2.9/nis/nss_nis/nis-pwd.c @@ -39,7 +39,7 @@ /* Protect global state against multiple changers */ __libc_lock_define_initialized (static, lock) -static bool_t new_start = 1; +static bool new_start = true; static char *oldkey; static int oldkeylen; static intern_t intern; @@ -108,13 +108,10 @@ _nis_saveit (int instatus, char *inkey, static void internal_nis_endpwent (void) { - new_start = 1; - if (oldkey != NULL) - { - free (oldkey); - oldkey = NULL; - oldkeylen = 0; - } + new_start = true; + free (oldkey); + oldkey = NULL; + oldkeylen = 0; struct response_t *curr = intern.next; @@ -264,18 +261,21 @@ internal_nis_getpwent_r (struct passwd * } /* Check for adjunct style secret passwords. They can be - recognized by a password starting with "##". */ + recognized by a password starting with "##". We do not use + it if the passwd.adjunct.byname table is supposed to be used + as a shadow.byname replacement. */ char *p = strchr (result, ':'); size_t namelen; char *result2; int len2; - if (p != NULL /* This better should be true in all cases. */ + if ((_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW) == 0 + && p != NULL /* This better should be true in all cases. */ && p[1] == '#' && p[2] == '#' && (namelen = p - result, yp_match (domain, "passwd.adjunct.byname", result, namelen, &result2, &len2)) == YPERR_SUCCESS) { - /* We found a passwd.adjunct entry. Merge encrypted + /* We found a passwd.adjunct.byname entry. Merge encrypted password therein into original result. */ char *encrypted = strchr (result2, ':'); char *endp; @@ -325,7 +325,7 @@ internal_nis_getpwent_r (struct passwd * } while (isspace (*p)) - ++p; + ++p; if (!batch_read) free (result); @@ -346,7 +346,7 @@ internal_nis_getpwent_r (struct passwd * free (oldkey); oldkey = outkey; oldkeylen = keylen; - new_start = 0; + new_start = false; } } while (parse_res < 1); @@ -399,16 +399,19 @@ _nss_nis_getpwnam_r (const char *name, s } /* Check for adjunct style secret passwords. They can be recognized - by a password starting with "##". */ + by a password starting with "##". We do not use it if the + passwd.adjunct.byname table is supposed to be used as a shadow.byname + replacement. */ char *result2; int len2; char *p = strchr (result, ':'); - if (p != NULL /* This better should be true in all cases. */ + if ((_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW) == 0 + && p != NULL /* This better should be true in all cases. */ && p[1] == '#' && p[2] == '#' && yp_match (domain, "passwd.adjunct.byname", name, namelen, &result2, &len2) == YPERR_SUCCESS) { - /* We found a passwd.adjunct entry. Merge encrypted password + /* We found a passwd.adjunct.byname entry. Merge encrypted password therein into original result. */ char *encrypted = strchr (result2, ':'); char *endp; @@ -465,7 +468,7 @@ _nss_nis_getpwnam_r (const char *name, s if (__builtin_expect (parse_res < 1, 0)) { if (parse_res == -1) - return NSS_STATUS_TRYAGAIN; + return NSS_STATUS_TRYAGAIN; else return NSS_STATUS_NOTFOUND; } @@ -498,18 +501,21 @@ _nss_nis_getpwuid_r (uid_t uid, struct p } /* Check for adjunct style secret passwords. They can be recognized - by a password starting with "##". */ + by a password starting with "##". We do not use it if the + passwd.adjunct.byname table is supposed to be used as a shadow.byname + replacement. */ char *result2; int len2; size_t namelen; char *p = strchr (result, ':'); - if (p != NULL /* This better should be true in all cases. */ + if ((_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW) == 0 + && p != NULL /* This better should be true in all cases. */ && p[1] == '#' && p[2] == '#' && (namelen = p - result, yp_match (domain, "passwd.adjunct.byname", result, namelen, &result2, &len2)) == YPERR_SUCCESS) { - /* We found a passwd.adjunct entry. Merge encrypted password + /* We found a passwd.adjunct.byname entry. Merge encrypted password therein into original result. */ char *encrypted = strchr (result2, ':'); char *endp; @@ -567,7 +573,7 @@ _nss_nis_getpwuid_r (uid_t uid, struct p if (__builtin_expect (parse_res < 1, 0)) { if (parse_res == -1) - return NSS_STATUS_TRYAGAIN; + return NSS_STATUS_TRYAGAIN; else return NSS_STATUS_NOTFOUND; } Index: glibc-2.9/nis/nss_nis/nis-spwd.c =================================================================== --- glibc-2.9.orig/nis/nss_nis/nis-spwd.c +++ glibc-2.9/nis/nss_nis/nis-spwd.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1996-1998,2001,2002,2003,2006 Free Software Foundation, Inc. +/* Copyright (C) 1996-1998,2001-2003,2006,2010 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996. @@ -31,6 +31,7 @@ #include <rpcsvc/ypclnt.h> #include "nss-nis.h" +#include <libnsl.h> /* Get the declaration of the parser function. */ #define ENTNAME spent @@ -41,7 +42,8 @@ /* Protect global state against multiple changers */ __libc_lock_define_initialized (static, lock) -static bool_t new_start = 1; +static bool new_start = true; +static bool ent_adjunct_used; static char *oldkey; static int oldkeylen; @@ -50,7 +52,8 @@ _nss_nis_setspent (int stayopen) { __libc_lock_lock (lock); - new_start = 1; + new_start = true; + ent_adjunct_used = false; free (oldkey); oldkey = NULL; oldkeylen = 0; @@ -83,32 +86,50 @@ internal_nis_getspent_r (struct spwd *sp int yperr; if (new_start) - yperr = yp_first (domain, "shadow.byname", &outkey, &keylen, &result, - &len); + { + yperr = yp_first (domain, "shadow.byname", &outkey, &keylen, &result, + &len); + if (__builtin_expect (yperr == YPERR_MAP, 0) + && (_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW)) + { + free (result); + yperr = yp_first (domain, "passwd.adjunct.byname", &outkey, + &keylen, &result, &len); + ent_adjunct_used = true; + } + } else - yperr = yp_next (domain, "shadow.byname", oldkey, oldkeylen, &outkey, - &keylen, &result, &len); + yperr = yp_next (domain, (ent_adjunct_used + ? "passwd.adjunct.byname" : "shadow.byname"), + oldkey, oldkeylen, &outkey, &keylen, &result, &len); if (__builtin_expect (yperr != YPERR_SUCCESS, 0)) - { + { enum nss_status retval = yperr2nss (yperr); if (retval == NSS_STATUS_TRYAGAIN) *errnop = errno; - return retval; - } + return retval; + } - if (__builtin_expect ((size_t) (len + 1) > buflen, 0)) - { - free (result); + if (__builtin_expect ((size_t) (len + (ent_adjunct_used ? 3 : 1)) + > buflen, 0)) + { + free (result); *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } + return NSS_STATUS_TRYAGAIN; + } char *p = strncpy (buffer, result, len); - buffer[len] = '\0'; + if (ent_adjunct_used) + /* This is an ugly trick. The format of passwd.adjunct.byname almost + matches the shadow.byname format except that the last two fields + are missing. Synthesize them by marking them empty. */ + strcpy (&buffer[len], "::"); + else + buffer[len] = '\0'; while (isspace (*p)) - ++p; + ++p; free (result); parse_res = _nss_files_parse_spent (p, sp, (void *) buffer, buflen, @@ -123,7 +144,7 @@ internal_nis_getspent_r (struct spwd *sp free (oldkey); oldkey = outkey; oldkeylen = keylen; - new_start = 0; + new_start = false; } while (!parse_res); @@ -154,15 +175,25 @@ _nss_nis_getspnam_r (const char *name, s *errnop = EINVAL; return NSS_STATUS_UNAVAIL; } + const size_t name_len = strlen (name); char *domain; if (__builtin_expect (yp_get_default_domain (&domain), 0)) return NSS_STATUS_UNAVAIL; + bool adjunct_used = false; char *result; int len; - int yperr = yp_match (domain, "shadow.byname", name, strlen (name), &result, + int yperr = yp_match (domain, "shadow.byname", name, name_len, &result, &len); + if (__builtin_expect (yperr == YPERR_MAP, 0) + && (_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW)) + { + free (result); + yperr = yp_match (domain, "passwd.adjunct.byname", name, name_len, + &result, &len); + adjunct_used = true; + } if (__builtin_expect (yperr != YPERR_SUCCESS, 0)) { @@ -173,7 +204,7 @@ _nss_nis_getspnam_r (const char *name, s return retval; } - if (__builtin_expect ((size_t) (len + 1) > buflen, 0)) + if (__builtin_expect ((size_t) (len + (adjunct_used ? 3 : 1)) > buflen, 0)) { free (result); *errnop = ERANGE; @@ -181,7 +212,13 @@ _nss_nis_getspnam_r (const char *name, s } char *p = strncpy (buffer, result, len); - buffer[len] = '\0'; + if (__builtin_expect (adjunct_used, false)) + /* This is an ugly trick. The format of passwd.adjunct.byname almost + matches the shadow.byname format except that the last two fields + are missing. Synthesize them by marking them empty. */ + strcpy (&buffer[len], "::"); + else + buffer[len] = '\0'; while (isspace (*p)) ++p; free (result);
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