From 391a0131017eb857a68e8161c5d9fa89c96f0945 Mon Sep 17 00:00:00 2001 From: Anas Nashif Date: Tue, 6 Nov 2012 21:22:38 -0800 Subject: Imported Upstream version 0.5.5 --- COPYING | 481 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 62 ++++++++ utempter.c | 161 ++++++++++++++++++++ utempter.h | 3 + utempter.spec | 129 ++++++++++++++++ utmp.c | 44 ++++++ utmpintf.c | 65 ++++++++ 7 files changed, 945 insertions(+) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 utempter.c create mode 100644 utempter.h create mode 100644 utempter.spec create mode 100644 utmp.c create mode 100644 utmpintf.c diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..eb685a5 --- /dev/null +++ b/COPYING @@ -0,0 +1,481 @@ + GNU LIBRARY GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1991 Free Software Foundation, Inc. + 675 Mass Ave, Cambridge, MA 02139, 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 library GPL. 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cvs -d$(CVSROOT) export -r$(CVSTAG) $(NAME) + @mv /tmp/$(NAME) /tmp/$(NAME)-$(VERSION) + @dir=$$PWD; cd /tmp; tar cvzf $$dir/$(NAME)-$(VERSION).tar.gz $(NAME)-$(VERSION) + @rm -rf /tmp/$(NAME)-$(VERSION) + @echo "The archive is in $(NAME)-$(VERSION).tar.gz" + +srpm-x: + @echo Creating $(NAME) src.rpm + @mkdir -p $(HOME)/rpmbuild/$(NAME)-$(VERSION) + @mv $(NAME)-$(VERSION).tar.* $(HOME)/rpmbuild/$(NAME)-$(VERSION)/ + @cp $(NAME).spec $(HOME)/rpmbuild/$(NAME)-$(VERSION)/ + @pushd $(HOME)/rpmbuild/$(NAME)-$(VERSION) &> /dev/null ; rpmbuild --nodeps -bs $(NAME).spec ; popd &> /dev/null + @echo SRPM is: $(HOME)/rpmbuild/SRPMS/$(NAME)-$(VERSION)-$(RELEASE).src.rpm diff --git a/utempter.c b/utempter.c new file mode 100644 index 0000000..dd65520 --- /dev/null +++ b/utempter.c @@ -0,0 +1,161 @@ +#define _GNU_SOURCE 1 + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static void usage(void) { + fprintf(stderr, "Usage: -a \n" + " -d \n"); + exit(1); +} + +static void checkDevice(const char * device) { + struct stat sb1, sb2; + int flags; + + if (strstr(device, "/../") || strstr(device, "/./") || + strstr(device, "//")) { + fprintf(stderr, "a simple path is required\n"); + exit(1); + } + + if (strncmp(device, "/dev/", 5)) { + fprintf(stderr, "the device must begin with /dev/\n"); + exit(1); + } + + if (fstat(3, &sb1)) { + fprintf(stderr, "error stat'ing fd 3: %s\n", strerror(errno)); + exit(1); + } + + if (major(sb1.st_rdev) == 2) { + if (lstat(device, &sb2)) { + fprintf(stderr, "error stat'ing %s: %s\n", device, strerror(errno)); + exit(1); + } + + if (major(sb2.st_rdev) != 3) { + fprintf(stderr, "%s is not the slave for the master pty on fd 3\n", + device); + exit(1); + } + + if (minor(sb1.st_rdev) != minor(sb2.st_rdev)) { + fprintf(stderr, "fd 3 and %s are not the same device\n", + device); + exit(1); + } + } else if (major(sb1.st_rdev) == 5 && minor(sb1.st_rdev) == 2) { + char * dev2 = ptsname(3); + + if (!dev2 || strcmp(dev2, device)) { + fprintf(stderr, "passed master doesn't match slave name\n"); + exit(1); + } + } else { + fprintf(stderr, "fd 3 is not a master pty device (it is %d, %d)\n", + major(sb1.st_rdev), minor(sb1.st_rdev)); + exit(1); + } + + if ((flags = fcntl(3, F_GETFL, 0)) < 0) { + fprintf(stderr, "error getting flags for fd 3: %s\n", strerror(errno)); + exit(1); + } + + if ((flags & O_RDWR) != O_RDWR) { + fprintf(stderr, "fd 3 is not read/writeable\n"); + exit(1); + } +} + +int main(int argc, const char ** argv) { + struct utmpx utx; + int add; + const char * device, * host; + struct passwd * pw; + int i; + struct stat sb; + char * id; + + if (argc < 3) usage(); + + for (i = 0; i < 3; i++) { + if (fstat(i, &sb)) { + fprintf(stderr, "error: failed to stat %d\n", i); + exit(1); + } + } + + if (!strcmp(argv[1], "-a")) { + if (argc > 4) usage(); + add = 1; + } else if (!strcmp(argv[1], "-d")) { + if (argc != 3) usage(); + add = 0; + } else + usage(); + + device = argv[2]; + + if (!getuid()) { + host = argv[3]; /* either NULL or something real */ + } else { + host = NULL; + } + + memset(&utx, 0, sizeof(utx)); + if (add) + utx.ut_type = USER_PROCESS; + else + utx.ut_type = DEAD_PROCESS; + + utx.ut_pid = getppid(); + if (utx.ut_pid == 1) { + fprintf(stderr, "error: parent pid should not be init\n"); + exit(1); + } + + checkDevice(device); + + strncpy(utx.ut_line, device + 5, sizeof(utx.ut_line)); + + pw = getpwuid(getuid()); + if (!pw) { + fprintf(stderr, "cannot find user w/ uid %d\n", getuid()); + exit(1); + } + + strncpy(utx.ut_user, pw->pw_name, sizeof(utx.ut_user)); + + if (host) + strncpy(utx.ut_host, host, sizeof(utx.ut_host)); + + if (!strncmp("pts/", utx.ut_line, 4)) { + id = utx.ut_line + 3; + if (strlen(id) > 4) id++; + } else { + id = utx.ut_line + 2; + } + + strncpy(utx.ut_id, id, sizeof(utx.ut_id)); + + gettimeofday(&utx.ut_tv, NULL); + + pututxline(&utx); + updwtmpx(_PATH_WTMP, &utx); + + return 0; +} diff --git a/utempter.h b/utempter.h new file mode 100644 index 0000000..347bcd7 --- /dev/null +++ b/utempter.h @@ -0,0 +1,3 @@ +void addToUtmp(const char *pty, const char *hostname, int cmdfd); +void removeFromUtmp(void); /* removes the last pty added to utmp */ +void removeLineFromUtmp(const char * pty, int fd); diff --git a/utempter.spec b/utempter.spec new file mode 100644 index 0000000..cb6536a --- /dev/null +++ b/utempter.spec @@ -0,0 +1,129 @@ +Summary: A privileged helper for utmp/wtmp updates. +Name: utempter +Version: 0.5.5 +Release: 1 +License: MIT/LGPL +Group: System Environment/Base +Source: utempter-%{version}.tar.gz +Prereq: /usr/sbin/groupadd, /sbin/ldconfig, fileutils +BuildRoot: %{_tmppath}/%{name}-%{version}-root + +%description +Utempter is a utility which allows some non-privileged programs to +have required root access without compromising system +security. Utempter accomplishes this feat by acting as a buffer +between root and the programs. + +%prep +%setup -q + +%build +make RPM_OPT_FLAGS="$RPM_OPT_FLAGS" + +%install +rm -rf $RPM_BUILD_ROOT +make PREFIX=$RPM_BUILD_ROOT LIBDIR=%{_libdir} install +/sbin/ldconfig -n $RPM_BUILD_ROOT/%{_libdir} + +%clean +rm -rf $RPM_BUILD_ROOT + +%pre +%{_sbindir}/groupadd -g 22 -r -f utmp || : + +%post +{ + /sbin/ldconfig + for file in /var/log/wtmp /var/run/utmp ; do + if [ -f $file ]; then + chown root:utmp $file + chmod 664 $file + fi + done +} + +%postun -p /sbin/ldconfig + +%files +%defattr(-,root,root) +%attr(02755, root, utmp) %{_sbindir}/utempter +%doc COPYING +%{_libdir}/libutempter.so* +%{_includedir}/utempter.h + +%changelog +* Mon Apr 19 2004 Mike A. Harris 0.5.5-1 +- [SECURITY] Fix CAN-2004-0233 utempter directory traversal symlink attack + issue for immediate erratum release. +- Build all-arch test package 0.5.5-1 in dist-fc2-scratch + +* Mon Feb 23 2004 Mike A. Harris 0.5.4-1 +- Rewrote post install script to be a bit cleaner and rebuilt in rawhide to + pick up twaugh's chown change +- Added 'srpm-x' target to Makefile for package maintainer SRPM building + +* Mon Feb 23 2004 Tim Waugh +- Use ':' instead of '.' as separator for chown. + +* Fri May 30 2003 Mike A. Harris 0.5.3-1 +- Bump version and release and rebuild to strip debug info into .debuginfo + package, as the Red Hat Linux 9 package shipped unstripped (#91664) +- Updated license field to reflect dual license MIT style + LGPL +- Changed spec file Copyright tag to proper License tag +- Removed stupid crackrock "version" macro define + +* Tue Feb 18 2003 Matt Wilson 0.5.2-16 +- get the second SIGCHLD SIG_IGN case too (#84571) + +* Tue Feb 11 2003 Bill Nottingham 0.5.2-15 +- don't set SIGCHLD handler to SIG_IGN and then wait + +* Tue Feb 04 2003 Florian La Roche +- add symlink to shared lib +- internal sync + +* Tue Oct 8 2002 Mike A. Harris 0.5.2-12 +- All-arch rebuild +- Removed dumb usage of {version} in Version: tag + +* Thu Sep 5 2002 Mike A. Harris 0.5.2-11hammer +- Updated BuildRoot line to meet Red Hat standards +- Updated filelist to use rpm macros for _libdir, etc. +- Added comment to top of specfile to remind people to check utempter changes + into CVS, since utempter IS managed by CVS afterall... I will fix the + missing bits in CVS soon once the package is reassigned to me +- Added 'LIBDIR=%{_libdir}' to make commandline for proper x86_64 build +- Added libdir patch to Makefile + +* Fri Jun 21 2002 Tim Powers +- automated rebuild + +* Thu Jun 20 2002 Elliot Lee 0.5.2-9 +- Don't strip binary + +* Thu May 23 2002 Tim Powers +- automated rebuild + +* Wed Jan 09 2002 Tim Powers +- automated rebuild + +* Sun Jun 24 2001 Elliot Lee +- Bump release + rebuild. + +* Thu Jul 13 2000 Prospector +- automatic rebuild + +* Sat Jun 17 2000 Matt Wilson +- defattr root + +* Thu Feb 24 2000 Erik Troan +- added LGPL notice + +* Mon Sep 13 1999 Bill Nottingham +- strip utempter + +* Mon Aug 30 1999 Bill Nottingham +- add utmp as group 22 + +* Fri Jun 4 1999 Jeff Johnson +- ignore SIGCHLD while processing utmp. diff --git a/utmp.c b/utmp.c new file mode 100644 index 0000000..f6bf737 --- /dev/null +++ b/utmp.c @@ -0,0 +1,44 @@ +#include +#include + +const char * utTypeName(short int foo) { + switch (foo) { + case EMPTY: + return "EMPTY"; + case RUN_LVL: + return "RUN_LVL"; + case BOOT_TIME: + return "BOOT_TIME"; + case NEW_TIME: + return "NEW_TIME"; + case OLD_TIME: + return "OLD_TIME"; + case INIT_PROCESS: + return "INIT_PROCESS"; + case LOGIN_PROCESS: + return "LOGIN_PROCESS"; + case USER_PROCESS: + return "USER_PROCESS"; + case DEAD_PROCESS: + return "DEAD_PROCESS"; + case ACCOUNTING: + return "ACCOUNTING"; + } + + return "(unknown)"; +} + +int main() { + struct utmp * ut; + + setutent(); + while ((ut = getutent())) { + if (ut->ut_type == DEAD_PROCESS) continue; + + printf("%-13s %5d /dev/%-5s %-8s %-15s\n", + utTypeName(ut->ut_type), ut->ut_pid, ut->ut_line, + *ut->ut_user ? ut->ut_user : "(user)", ut->ut_host); + } + + return 0; +} diff --git a/utmpintf.c b/utmpintf.c new file mode 100644 index 0000000..dd192ac --- /dev/null +++ b/utmpintf.c @@ -0,0 +1,65 @@ +#include +#include +#include +#include +#include +#include +#include + +#include "utempter.h" + +static char * ptyName = NULL; +static int masterFd; + +void addToUtmp(const char *pty, const char *hostname, int cmdfd) +{ + char * argv[] = { "/usr/sbin/utempter", "-a", pty, hostname, NULL}; + pid_t child; + int status; + void (*osig) (int) = signal(SIGCHLD, SIG_DFL); + + if (!(child = fork())) { + signal(SIGCHLD, SIG_DFL); + /* these have to be open to something */ + dup2(cmdfd, 0); + dup2(cmdfd, 1); + dup2(cmdfd, 3); + execv(argv[0], argv); + exit(1); + } + + waitpid(child, &status, 0); + signal(SIGCHLD, osig); + + ptyName = strdup(pty); + masterFd = cmdfd; +} + +void removeFromUtmp(void) +{ + if (!ptyName) return; + + removeLineFromUtmp(ptyName, masterFd); + + free(ptyName); + ptyName = NULL; +} + +void removeLineFromUtmp(const char * pty, int fd) { + char * argv[] = { "/usr/sbin/utempter", "-d", pty, NULL}; + pid_t child; + void (*osig) (int) = signal(SIGCHLD, SIG_DFL); + + if (!(child = fork())) { + signal(SIGCHLD, SIG_DFL); + /* these have to be open to something */ + dup2(fd, 0); + dup2(fd, 1); + dup2(fd, 3); + execv(argv[0], argv); + fprintf(stderr, "EXEC FAILED!\n"); + } + + waitpid(child, NULL, 0); + signal(SIGCHLD, osig); +} -- cgit v1.2.3