From 03b6b479897df2f195120622e69f87aede855589 Mon Sep 17 00:00:00 2001 From: megacz Date: Tue, 25 Mar 2008 21:48:18 -0700 Subject: [PATCH 1/1] initial import --- COPYING | 504 +++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 34 ++++ README | 109 ++++++++++ debian/changelog | 29 +++ debian/compat | 1 + debian/control | 20 ++ debian/copyright | 9 + debian/default | 16 ++ debian/dirs | 3 + debian/docs | 2 + debian/rules | 87 ++++++++ nss_afs.c | 396 +++++++++++++++++++++++++++++++++++++ nss_afs_test.c | 64 ++++++ 13 files changed, 1274 insertions(+) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 README create mode 100644 debian/changelog create mode 100644 debian/compat create mode 100644 debian/control create mode 100644 debian/copyright create mode 100644 debian/default create mode 100644 debian/dirs create mode 100644 debian/docs create mode 100755 debian/rules create mode 100644 nss_afs.c create mode 100644 nss_afs_test.c diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..b1e3f5a --- /dev/null +++ b/COPYING @@ -0,0 +1,504 @@ + GNU LESSER GENERAL PUBLIC LICENSE + Version 2.1, February 1999 + + Copyright (C) 1991, 1999 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + +[This is the first released version of the Lesser GPL. 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It consists of 2 binary parts: + +1. The ptdbnssd, a daemon that clients may connect to by + udp://localhost:6998 to find out the UID for a usename or vice versa +2. The 'ptdb'-nss-module (libnss-ptdb) that will connect to ptdbnssd, + whenever it needs to lookup a username or a UID. + +libnss-ptdb will provide user homedirectories which are determined using +one of 2 methods (see below). Further more it provides a login shell +which is determined using one of 3 methods. + +As a bonus, this package provides a group-nss-plugin, assigning descriptive +names to PAG-groups (i.e. "AfsPag-1121" ). + +My main intention for writing this module was to provide a really simple +way of providing user accoung information to AFS-client machines. I wanted +to avoid using ldap withing the Instantafs-Project. +Visit http://instantafs.cbs.mpg.de for more information about InstantAFS. + +What about the homedirectories and login shells? +------------------------------------------------ + +Homedirectories are determined by the nss-plugin but the configuration is done +by ptdbnssd. ptdbnssd accepts the parameters '-H' and '-S' to select a +method of determining homedirectories/login shells. Whenever a nss-plugin does +a lookup (either by uid or by name) ptdbnssd sends the current configuration +(basically: what you defined as -H and -S parameters) to the nss-plugin. +The Plugin then calculates the homedirectory and login shell on its own. + +The advantage of that concept is that filesystem-accesses are always done by +user programs, not locking ptdbnssd for other lookups. On the other hand, +it's possible to change the homedir/loginshell-policy by restarting ptdbnssd +host wide instantaniously. + +When using debian, just edit /etc/default/ptdbnssd to change the policy. + +What do I have to do to get it working? +--------------------------------------- + +Set up the AFS-client on your local computer. You must have a file +"/etc/openafs/ThisCell" containing *only* the full name of your +local cell. + +You need glibc- and openafs-headers (debian-packages glibc6-dev and +libopenafs-dev). + +Type that: + +# make +# make install + +Run the deamon (consider running it as an unprivileged user): + +$ /usr/bin/ptdbnssd + +Use /usr/lib/libnss-ptdb/nsstest to check, if ptdbnssd and the nss-module +are working correctly. If not, /usr/lib/libnss-ptdb/cstest helps you +to find out, if it's the deamon's fault. + +Modify /etc/nsswitch.conf , you need to rewrite the "passwd"- and the group-line: + +passwd: files ptdb +group: pag files + +Now use 'ls -l /afs/some/directory' to see, if it's working. + +Note: 'pag' should be the first group-plugin. The group name of PAG-groups is + calculated from their gid which is faster than i.e. a /etc/group-lookup. + +Debugging +--------- + +After building the package there are two additional binaries: + * cstest - Tries to resolve ID or username given at cmdline + by calling ptdbnssd directly + * nsstest - Tries to resolve ID or username given at cmdline + by using nss (libc name resolution). + +Last words +---------- + +The code was heavily "inspired" by Todd M. Lewis' (*) nss_pts_0.2 - Thank +you very much, Todd :-) . + +(*) can be found @ http://www.unc.edu/~utoddl + +If you have any questions, suggestions, patches, ... feel free to send me +an eMail. + +Everything contained in this package is released under the terms of the +GNU Lesser General Public License (see COPYING). + +Good luck, + + -- Frank Burkhardt Fri, 06 Apr 2007 11:45:23 +0200 diff --git a/debian/changelog b/debian/changelog new file mode 100644 index 0000000..d29081d --- /dev/null +++ b/debian/changelog @@ -0,0 +1,29 @@ +libnss-afs (0.94) unstable; urgency=low + + * fix bug that caused crashes after calls to _nss_afs_getgrgid_r() + + -- Adam Megacz Tue, 25 Mar 2008 10:56:14 -0700 + +libnss-afs (0.93) unstable; urgency=low + + * fix a bug in the gr_mem returned by the getgrent() function + + -- Adam Megacz Sun, 23 Mar 2008 21:58:49 -0700 + +libnss-afs (0.92) unstable; urgency=low + + * fixed PAG ranges to work on Linux + + -- Adam Megacz Sun, 23 Mar 2008 21:45:25 -0700 + +libnss-afs (0.91) unstable; urgency=low + + * merged libnss_pag into libnss_afs + + -- Adam Megacz Sun, 23 Mar 2008 21:32:51 -0700 + +libnss-afs (0.90) unstable; urgency=low + + * change to libnss-afs + + -- Adam Megacz Sun, 23 Mar 2008 16:26:45 -0700 diff --git a/debian/compat b/debian/compat new file mode 100644 index 0000000..b8626c4 --- /dev/null +++ b/debian/compat @@ -0,0 +1 @@ +4 diff --git a/debian/control b/debian/control new file mode 100644 index 0000000..54005ba --- /dev/null +++ b/debian/control @@ -0,0 +1,20 @@ +Source: libnss-afs +Section: net +Priority: extra +Maintainer: Adam Megacz +Build-Depends: debhelper (>= 4.0.0), libopenafs-dev, libc6-dev +Standards-Version: 3.6.0 + +Package: libnss-afs +Architecture: any +Depends: ${shlibs:Depends}, ${misc:Depends} +Suggests: nscd +Description: A NSS (Name Service Switch) module for AFS + Based on libnss-ptdb by Frank Burkhardt . + This module provides a NSS module that allows your + AFS-Protection-Database (PTDB) to act as a name service. + The only information the PTDB provides is a UID <-> username + mapping. We have to "guess" all the other passwd-fields. + . + You should use nscd to reduce network traffic caused by this + module. diff --git a/debian/copyright b/debian/copyright new file mode 100644 index 0000000..13e80e2 --- /dev/null +++ b/debian/copyright @@ -0,0 +1,9 @@ +This package was debianized by Adam Megacz + +It was downloaded from + +Upstream Author(s): Frank Burkhardt + +Copyright: + + diff --git a/debian/default b/debian/default new file mode 100644 index 0000000..26b0fa8 --- /dev/null +++ b/debian/default @@ -0,0 +1,16 @@ +# Choose a method to determine user homedirectories. +# Valid choices are: +# 'auto' use /afs/[cellname]/user/[username] as homedirectory +# 'prefix use /afs/[cellname]/user/[u]/[us]/[username] as homedirectory +# 'admin' use the directory referenced by the symbolic link +# /afs/[cellname]/admin/homedirs/[username] as homedirectory +HOMEDIRS='prefix' + +# Choose a method to determine user's login shells. +# Valid choices are: +# 'bash' use the bash ( /bin/bash ) +# 'admin' use the binary referenced by the symbolic link +# /afs/[cellname]/admin/shells/[username] as login shell +# 'user' use the binary referenced by the symbolic link +# /afs/[cellname]/user/[username]/.loginshell +SHELLS='user' diff --git a/debian/dirs b/debian/dirs new file mode 100644 index 0000000..1ec5c7d --- /dev/null +++ b/debian/dirs @@ -0,0 +1,3 @@ +usr/bin +lib +etc/default diff --git a/debian/docs b/debian/docs new file mode 100644 index 0000000..1f562b3 --- /dev/null +++ b/debian/docs @@ -0,0 +1,2 @@ +README +COPYING diff --git a/debian/rules b/debian/rules new file mode 100755 index 0000000..d1062bc --- /dev/null +++ b/debian/rules @@ -0,0 +1,87 @@ +#!/usr/bin/make -f +# -*- makefile -*- +# Sample debian/rules that uses debhelper. +# GNU copyright 1997 to 1999 by Joey Hess. + +# Uncomment this to turn on verbose mode. +#export DH_VERBOSE=1 + + + + +CFLAGS = -Wall -g + +ifneq (,$(findstring noopt,$(DEB_BUILD_OPTIONS))) + CFLAGS += -O0 +else + CFLAGS += -O2 +endif +ifeq (,$(findstring nostrip,$(DEB_BUILD_OPTIONS))) + INSTALL_PROGRAM += -s +endif + +configure: configure-stamp +configure-stamp: + dh_testdir + # Add here commands to configure the package. + + touch configure-stamp + + +build: build-stamp + +build-stamp: configure-stamp + dh_testdir + + # Add here commands to compile the package. + $(MAKE) + #/usr/bin/docbook-to-man debian/libnss-afs.sgml > libnss-afs.1 + + touch build-stamp + +clean: + dh_testdir + dh_testroot + rm -f build-stamp configure-stamp + + # Add here commands to clean up after the build process. + -$(MAKE) clean + + dh_clean + +install: build + dh_testdir + dh_testroot + dh_clean -k + dh_installdirs + + # Add here commands to install the package into debian/libnss-afs. + mkdir -p $(CURDIR)/debian/libnss-afs + $(MAKE) install DESTDIR=$(CURDIR)/debian/libnss-afs + #install -m 644 default $(CURDIR)/debian/libnss-afs/etc/default/afsnssd + +# Build architecture-independent files here. +binary-indep: build install +# We have nothing to do by default. + +# Build architecture-dependent files here. +binary-arch: build install + dh_testdir + dh_testroot + dh_installchangelogs + dh_installdocs + dh_installexamples + #dh_installinit -- start 52 S . stop 33 0 6 . + dh_installman + dh_link + dh_strip + dh_compress + dh_fixperms + dh_installdeb + dh_shlibdeps + dh_gencontrol + dh_md5sums + dh_builddeb + +binary: binary-indep binary-arch +.PHONY: build clean binary-indep binary-arch binary install configure diff --git a/nss_afs.c b/nss_afs.c new file mode 100644 index 0000000..6004e74 --- /dev/null +++ b/nss_afs.c @@ -0,0 +1,396 @@ + +/* + * libnss_afs.c + * + * Copyright 2008, licensed under GNU Library General Public License (LGPL) + * see COPYING file for details + * + * derived from Frank Burkhardt's libnss_ptdb, + * which was derived from Todd M. Lewis' libnss_pts + */ + +/* + * if you are reading this code for the first time, start at the + * bottom and work your way upwards + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define HOMEDIR_AUTO 0 +#define HOMEDIR_ADMINLINK 1 +#define HOMEDIR_PREFIX 2 +#define SHELL_BASH 0 +#define SHELL_ADMINLINK 1 +#define SHELL_USERLINK 2 + +#define AFS_MAGIC_ANONYMOUS_USERID 32766 +#define MIN_PAG_GID 0x41000000L +#define MAX_PAG_GID 0x41FFFFFFL + +static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; + +extern int cpstr( char *str, char **buf, size_t *buflen); + +extern struct ubik_client *pruclient; + +int afs_initialized = 0; +char cellname[256]; +char homedir_prefix[300]; +int homedir_prefix_len=0; +char homedirs_method=0; +char shells_method=0; + +int cpstr( char *str, char **buf, size_t *buflen) { + int len = strlen(str); + if ( len >= *buflen-1 ) return 0; + strcpy(*buf,str); + *buflen -= len + 1; + *buf += len + 1; + return len; +} + + +/* + * Look up the name corresponding to uid, store in buffer. + * + * returns NSS_STATUS_SUCCESS, NSS_STATUS_NOTFOUND, or NSS_STATUS_UNAVAIL + */ +int ptsid2name(int uid, char **buffer, int *buflen) { + int ret, i; + idlist lid; + namelist lnames; + + init_afs(); + + if (uid==AFS_MAGIC_ANONYMOUS_USERID) { + if (!cpstr("anonymous", buffer, buflen)) return NSS_STATUS_UNAVAIL; + return NSS_STATUS_SUCCESS; + } + + if (pthread_mutex_lock(&mutex)) return NSS_STATUS_UNAVAIL; + + lid.idlist_val = (afs_int32*)&uid; + lid.idlist_len = 1; + lnames.namelist_val = 0; + lnames.namelist_len = 0; + + if (ubik_Call(PR_IDToName,pruclient,0,&lid,&lnames) != PRSUCCESS) { + pthread_mutex_unlock(&mutex); + return NSS_STATUS_UNAVAIL; + } + + ret = NSS_STATUS_NOTFOUND; + for (i=0;i 0 ) { + temp=readlink(buf,*buffer,*buflen); + if ( temp > -1) { + b[temp]=0; + *buflen = *buflen - temp - 1; + return -1; + } + } + if (! cpstr("/tmp",buffer,buflen) ) return -1; + break; + } + return 0; +} + +int get_shell(char *name, char **buffer, size_t *buflen) { + char buf[256]; + int temp; + char *b; + char* bufx = buf; + int bufxlen = 256; + b=*buffer; + + switch (shells_method) { + case SHELL_BASH: + if (!cpstr("/bin/bash",buffer, buflen)) return -1; + break; + + case SHELL_ADMINLINK: + if ( snprintf(buf,256,"/afs/%s/admin/shells/%s",cellname,name) > 0 ) { + temp=readlink(buf,*buffer,*buflen); + if ( temp > -1) { + b[temp]=0; + *buflen = *buflen - temp - 1; + return -1; + } + } + if (! cpstr("/bin/bash",buffer,buflen) ) + return -1; + break; + + case SHELL_USERLINK: + if (get_homedir(name, &bufx, &bufxlen)) return -1; + strncpy(buf+strlen(buf),"/.loginshell",bufxlen); + temp=readlink(buf,*buffer,*buflen); + if ( temp > -1) { + b[temp]=0; + *buflen = *buflen - temp - 1; + return -1; + } + if (! cpstr("/bin/bash",buffer,buflen) ) + return -1; + break; + } + return 0; +} + + +/** + * this function is invoked by glibc to resolve the name of a numeric groupid + */ +enum nss_status _nss_afs_getgrgid_r (gid_t gid, struct group *result, + char *buffer, size_t buflen, int *errnop) { + int length; + if ( gid < MIN_PAG_GID || gid > MAX_PAG_GID) { + *errnop=ENOENT; + return NSS_STATUS_NOTFOUND; + } + do { + result->gr_gid=gid; + + result->gr_name=buffer; + length=snprintf(buffer,buflen,"AfsPag-%x",gid-MIN_PAG_GID); + + if (length < 0) break; + length += 1; + buflen -= length; + buffer += length; + + result->gr_passwd=buffer; + + if (!cpstr("x",&buffer,&buflen)) break; + + if (buflen < sizeof(char*)) break; + result->gr_mem=buffer; + result->gr_mem[0] = NULL; + + *errnop=errno; + return NSS_STATUS_SUCCESS; + + } while(0); + *errnop=ENOENT; + return NSS_STATUS_UNAVAIL; +} + +/* + This is a the ptdb-getpwuid-function. +*/ +enum nss_status _nss_afs_getpwuid_r (uid_t uid, struct passwd *result_buf, char *buffer, size_t buflen, int *errnop) { + int temp; + + if (init_afs()) return NSS_STATUS_UNAVAIL; + + result_buf->pw_name = buffer; + temp = ptsid2name( uid, &buffer, &buflen); + if (temp != NSS_STATUS_SUCCESS) { + *errnop = ENOENT; + return temp; + } + +#ifdef LIMIT_USERNAME_CHARS + if ( strlen(result_buf->pw_name) > LIMIT_USERNAME_CHARS ) { + result_buf->pw_name[LIMIT_USERNAME_CHARS] = '\0'; + buflen = buflen + ( buffer - &result_buf->pw_name[LIMIT_USERNAME_CHARS+1] ); + buffer = &result_buf->pw_name[LIMIT_USERNAME_CHARS+1]; + } +#endif + + do { + /* set the password to "x" */ + result_buf->pw_passwd = buffer; + if ( ! cpstr("x",&buffer, &buflen) ) break; + /* the uid and gid are both the uid passed in */ + result_buf->pw_uid = uid; + result_buf->pw_gid = 65534; + /* make the gecos the same as the PTS name */ + result_buf->pw_gecos = buffer; + if ( ! cpstr(result_buf->pw_name, &buffer, &buflen ) ) break; + + // Set the homedirectory + result_buf->pw_dir = buffer; + if ( get_homedir(result_buf->pw_name,&buffer,&buflen) ) break; + + // Set the login shell + result_buf->pw_shell = buffer; + if ( get_shell(result_buf->pw_name,&buffer,&buflen) ) break; + + *errnop = errno; + return NSS_STATUS_SUCCESS; + } while(0); + + *errnop = ERANGE; + return NSS_STATUS_UNAVAIL; +} + + +/* + * This is the ptdb-getpwnam-function. + */ +enum nss_status _nss_afs_getpwnam_r (char *name, struct passwd *result_buf, char *buffer, size_t buflen, int *errnop) { + uid_t uid; + int temp; + + if (init_afs()) return NSS_STATUS_UNAVAIL; + + temp = ptsname2id(name,&uid); + if (temp != NSS_STATUS_SUCCESS) { + *errnop = ENOENT; + return temp; + } + + // This causes an additional PTDB-lookup and should be removed in the future + return _nss_afs_getpwuid_r (uid, result_buf,buffer,buflen, errnop); +} + diff --git a/nss_afs_test.c b/nss_afs_test.c new file mode 100644 index 0000000..f5c9c03 --- /dev/null +++ b/nss_afs_test.c @@ -0,0 +1,64 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +int main(int argc,char **argv,char **envp) { + int buflen=1000; + char buffer[buflen]; + char *buf; + char *arg; + int uid; + int res; + + buf=buffer; + if ( argc != 2 ) { + printf("Usage: %s [name or id]\n\nAsks (a hopefully running) ptdbnssd for an AFSID or a PT-username, returns both.\n",argv[0]); + exit(1); + } + arg=argv[1]; + if ( ( arg[0] > '0' ) && ( arg[0] < '9' ) ) { + // NAME-Lookup + uid=atoi(arg); + res=ptsid2name(uid,&buf,&buflen); + if ( res == NSS_STATUS_SUCCESS ) { + printf("uid=%i name=%s\n",uid,buffer); + //printf("homedir_method=%i, shell_method=%i\n",conf.homedirs_method,conf.shells_method); + return 0; + } else { + if ( res == NSS_STATUS_NOTFOUND ) { + printf("W: AFSID %i not found.\n",uid); + return 1; + } else { + if ( res == NSS_STATUS_UNAVAIL ) { + printf("E: Error talking to ptdbnssd.\n"); + return 2; + } + } + } + } else { + buf=buffer; + res=ptsname2id(arg,&uid); + if ( res == NSS_STATUS_SUCCESS ) { + printf("uid=%i name=%s\n",uid,arg); + //printf("homedir_method=%i, shell_method=%i\n",conf.homedirs_method,conf.shells_method); + return 0; + } else { + if ( res == NSS_STATUS_NOTFOUND ) { + printf("W: PT-user '%s' not found.\n",buf); + return 1; + } else { + if ( res == NSS_STATUS_UNAVAIL ) { + printf("E: Error talking to ptdbnssd.\n"); + return 2; + } + } + } + } +} -- 2.20.1