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at/at-3.1.13-pam.patch

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Index: atd.c
===================================================================
--- atd.c.orig
+++ atd.c
@@ -89,10 +89,14 @@
int selinux_enabled=0;
#include <selinux/flask.h>
#include <selinux/av_permissions.h>
#endif
+#ifndef LOG_ATD
+#define LOG_ATD LOG_DAEMON
+#endif
+
/* Macros */
#define BATCH_INTERVAL_DEFAULT 60
#define CHECK_INTERVAL 3600
@@ -114,11 +118,11 @@ static int nothing_to_do;
unsigned int batch_interval;
static int run_as_daemon = 0;
static volatile sig_atomic_t term_signal = 0;
-#ifdef HAVE_PAM
+#ifdef WITH_PAM
#include <security/pam_appl.h>
static pam_handle_t *pamh = NULL;
static const struct pam_conv conv = {
@@ -126,16 +130,17 @@ static const struct pam_conv conv = {
};
#define PAM_FAIL_CHECK if (retcode != PAM_SUCCESS) { \
fprintf(stderr,"\n%s\n",pam_strerror(pamh, retcode)); \
syslog(LOG_ERR,"%s",pam_strerror(pamh, retcode)); \
+ pam_close_session(pamh, PAM_SILENT); \
pam_end(pamh, retcode); exit(1); \
}
#define PAM_END { retcode = pam_close_session(pamh,0); \
pam_end(pamh,retcode); }
-#endif /* HAVE_PAM */
+#endif /* WITH_PAM */
/* Signal handlers */
RETSIGTYPE
set_term(int dummy)
{
@@ -263,10 +268,23 @@ static int set_selinux_context(const cha
freecon(user_context);
return 0;
}
#endif
+#undef ATD_MAIL_PROGRAM
+#undef ATD_MAIL_NAME
+#if defined(SENDMAIL)
+#define ATD_MAIL_PROGRAM SENDMAIL
+#define ATD_MAIL_NAME "sendmail"
+#elif defined(MAILC)
+#define ATD_MAIL_PROGRAM MAILC
+#define ATD_MAIL_NAME "mail"
+#elif defined(MAILX)
+#define ATD_MAIL_PROGRAM MAILX
+#define ATD_MAIL_NAME "mailx"
+#endif
+
static void
run_file(const char *filename, uid_t uid, gid_t gid)
{
/* Run a file by by spawning off a process which redirects I/O,
* spawns a subshell, then waits for it to complete and sends
@@ -288,11 +306,11 @@ run_file(const char *filename, uid_t uid
int ngid;
char queue;
char fmt[64];
unsigned long jobno;
int rc;
-#ifdef HAVE_PAM
+#ifdef WITH_PAM
int retcode;
#endif
#ifdef _SC_LOGIN_NAME_MAX
errno = 0;
@@ -450,20 +468,24 @@ run_file(const char *filename, uid_t uid
write_string(fd_out, mailname);
write_string(fd_out, "\n\n");
fstat(fd_out, &buf);
size = buf.st_size;
-#ifdef HAVE_PAM
+#ifdef WITH_PAM
PRIV_START
retcode = pam_start("atd", pentry->pw_name, &conv, &pamh);
PAM_FAIL_CHECK;
+ retcode = pam_set_item(pamh, PAM_TTY, "atd");
+ PAM_FAIL_CHECK;
retcode = pam_acct_mgmt(pamh, PAM_SILENT);
PAM_FAIL_CHECK;
retcode = pam_open_session(pamh, PAM_SILENT);
PAM_FAIL_CHECK;
retcode = pam_setcred(pamh, PAM_ESTABLISH_CRED | PAM_SILENT);
PAM_FAIL_CHECK;
+ closelog();
+ openlog("atd", LOG_PID, LOG_ATD);
PRIV_END
#endif
close(STDIN_FILENO);
close(STDOUT_FILENO);
@@ -474,10 +496,20 @@ run_file(const char *filename, uid_t uid
perr("Error in fork");
else if (pid == 0) {
char *nul = NULL;
char **nenvp = &nul;
+#ifdef WITH_PAM
+ char **pam_envp=0L;
+#endif
+
+ PRIV_START
+#ifdef WITH_PAM
+ pam_envp = pam_getenvlist(pamh);
+ if ( ( pam_envp != 0L ) && (pam_envp[0] != 0L) )
+ nenvp = pam_envp;
+#endif
/* Set up things for the child; we want standard input from the
* input file, and standard output and error sent to our output file.
*/
if (lseek(fd_in, (off_t) 0, SEEK_SET) < 0)
@@ -493,12 +525,10 @@ run_file(const char *filename, uid_t uid
perr("Error in I/O redirection");
close(fd_in);
close(fd_out);
- PRIV_START
-
nice((tolower((int) queue) - 'a' + 1) * 2);
if (initgroups(pentry->pw_name, pentry->pw_gid))
perr("Cannot initialize the supplementary group access list");
@@ -526,10 +556,20 @@ run_file(const char *filename, uid_t uid
if (security_getenforce()==1)
perr("Could not resset exec context for user %s\n", pentry->pw_name);
#endif
//end
+#ifdef WITH_PAM
+ if ( ( nenvp != &nul ) && (pam_envp != 0L) && (*pam_envp != 0L))
+ {
+ for( nenvp = pam_envp; *nenvp != 0L; nenvp++)
+ free(*nenvp);
+ free( pam_envp );
+ nenvp = &nul;
+ pam_envp=0L;
+ }
+#endif
PRIV_END
}
/* We're the parent. Let's wait.
*/
close(fd_in);
@@ -538,18 +578,10 @@ run_file(const char *filename, uid_t uid
non-blocking waitpid. So this blocking one will eventually
return with an ECHILD error.
*/
waitpid(pid, (int *) NULL, 0);
-#ifdef HAVE_PAM
- PRIV_START
- pam_setcred(pamh, PAM_DELETE_CRED | PAM_SILENT);
- retcode = pam_close_session(pamh, PAM_SILENT);
- pam_end(pamh, retcode);
- PRIV_END
-#endif
-
/* Send mail. Unlink the output file after opening it, so it
* doesn't hang around after the run.
*/
fstat(fd_out, &buf);
lseek(fd_out, 0, SEEK_SET);
@@ -570,19 +602,51 @@ run_file(const char *filename, uid_t uid
if (unlink(filename) == -1)
syslog(LOG_WARNING, "Warning: removing output file for job %li failed: %s",
jobno, strerror(errno));
+#ifdef WITH_PAM
+ pam_setcred(pamh, PAM_DELETE_CRED | PAM_SILENT );
+ pam_close_session(pamh, PAM_SILENT);
+ pam_end(pamh, PAM_ABORT);
+ closelog();
+ openlog("atd", LOG_PID, LOG_ATD);
+#endif
+
/* The job is now finished. We can delete its input file.
*/
chdir(ATJOB_DIR);
unlink(newname);
free(newname);
if (((send_mail != -1) && (buf.st_size != size)) || (send_mail == 1)) {
+ int mail_pid = -1;
+
+#ifdef WITH_PAM
PRIV_START
+ retcode = pam_start("atd", pentry->pw_name, &conv, &pamh);
+ PAM_FAIL_CHECK;
+ retcode = pam_set_item(pamh, PAM_TTY, "atd");
+ PAM_FAIL_CHECK;
+ retcode = pam_acct_mgmt(pamh, PAM_SILENT);
+ PAM_FAIL_CHECK;
+ retcode = pam_open_session(pamh, PAM_SILENT);
+ PAM_FAIL_CHECK;
+ retcode = pam_setcred(pamh, PAM_ESTABLISH_CRED | PAM_SILENT);
+ PAM_FAIL_CHECK;
+ /* PAM has now re-opened our log to auth.info ! */
+ closelog();
+ openlog("atd", LOG_PID, LOG_ATD);
+ PRIV_END
+#endif
+
+ mail_pid = fork();
+
+ if ( mail_pid == 0 )
+ {
+ PRIV_START
if (initgroups(pentry->pw_name, pentry->pw_gid))
perr("Cannot initialize the supplementary group access list");
if (setgid(gid) < 0)
@@ -591,18 +655,85 @@ run_file(const char *filename, uid_t uid
if (setuid(uid) < 0)
perr("Cannot set user id");
chdir ("/");
+#ifdef WITH_SELINUX
+ if (selinux_enabled>0) {
+ security_context_t user_context=NULL;
+ security_context_t file_context=NULL;
+ int retval=0;
+ struct av_decision avd;
+
+ if (get_default_context(pentry->pw_name, NULL, &user_context))
+ perr("execle: couldn't get security context for user %s\n", pentry->pw_name);
+ /*
+ * Since crontab files are not directly executed,
+ * crond must ensure that the crontab file has
+ * a context that is appropriate for the context of
+ * the user cron job. It performs an entrypoint
+ * permission check for this purpose.
+ */
+ if (fgetfilecon(STDIN_FILENO, &file_context) < 0)
+ perr("fgetfilecon FAILED %s", filename);
+
+ retval = security_compute_av(user_context,
+ file_context,
+ SECCLASS_FILE,
+ FILE__ENTRYPOINT,
+ &avd);
+ freecon(file_context);
+ if (retval || ((FILE__ENTRYPOINT & avd.allowed) != FILE__ENTRYPOINT)) {
+ if (security_getenforce()==1)
+ perr("Not allowed to set exec context to %s for user %s\n", user_context,pentry->pw_name);
+ }
+
+ if (setexeccon(user_context) < 0) {
+ if (security_getenforce()==1) {
+ perr("Could not set exec context to %s for user %s\n", user_context,pentry->pw_name);
+ } else {
+ syslog(LOG_ERR, "Could not set exec context to %s for user %s\n", user_context,pentry->pw_name);
+ }
+ }
+ freecon(user_context);
+ }
+#endif
+
#if defined(SENDMAIL)
execl(SENDMAIL, "sendmail", "-i", mailname, (char *) NULL);
#else
#error "No mail command specified."
#endif
perr("Exec failed for mail command");
- PRIV_END
+ exit (-1);
+
+#ifdef WITH_SELINUX
+ if (selinux_enabled>0) {
+ if (setexeccon(NULL) < 0) {
+ perr("Could not resset exec context for user %s\n", pentry->pw_name);
+ }
+ }
+#endif
+
+ PRIV_END;
+ } else if ( mail_pid == -1 )
+ {
+ perr("fork of mailer failed");
+ }
+ else
+ {
+ /* Parent */
+ waitpid(mail_pid, (int *) NULL, 0);
+ }
+#ifdef WITH_PAM
+ pam_setcred(pamh, PAM_DELETE_CRED | PAM_SILENT );
+ pam_close_session(pamh, PAM_SILENT);
+ pam_end(pamh, PAM_ABORT);
+ closelog();
+ openlog("atd", LOG_PID, LOG_ATD);
+#endif
}
exit(EXIT_SUCCESS);
}
static time_t
@@ -817,16 +948,11 @@ main(int argc, char *argv[])
daemon_gid = ge->gr_gid;
RELINQUISH_PRIVS_ROOT(daemon_uid, daemon_gid)
-#ifndef LOG_CRON
-#define LOG_CRON LOG_DAEMON
-#endif
-
- openlog("atd", LOG_PID, LOG_CRON);
-
+ openlog("atd", LOG_PID, LOG_ATD);
opterr = 0;
errno = 0;
run_as_daemon = 1;
batch_interval = BATCH_INTERVAL_DEFAULT;
Index: config.h.in
===================================================================
--- config.h.in.orig
+++ config.h.in
@@ -69,13 +69,10 @@
#undef HAVE_NLIST_H
/* Define to 1 for PAM support */
#undef HAVE_PAM
-/* Define if you are building with_selinux */
-#undef WITH_SELINUX
-
/* Define to 1 if you have the `pstat_getdynamic' function. */
#undef HAVE_PSTAT_GETDYNAMIC
/* Define to 1 if you have the <security/pam_appl.h> header file. */
#undef HAVE_SECURITY_PAM_APPL_H
@@ -143,11 +140,11 @@
#undef HAVE_VPRINTF
/* Define to 1 if you have the `waitpid' function. */
#undef HAVE_WAITPID
-/* Define to 1 if we need to provide our own yywrap() */
+/* need yywrap */
#undef NEED_YYWRAP
/* Define to 1 if your `struct nlist' has an `n_un' member. Obsolete, depend
on `HAVE_STRUCT_NLIST_N_UN_N_NAME */
#undef NLIST_NAME_UNION
@@ -193,10 +190,13 @@
/* Define to 1 for Encore UMAX 4.3 that has <inq_status/cpustats.h> instead of
<sys/cpustats.h>. */
#undef UMAX4_3
+/* use PAM */
+#undef WITH_PAM
+
/* Define to 1 if `lex' declares `yytext' as a `char *' by default, not a
`char[]'. */
#undef YYTEXT_POINTER
/* Define to empty if `const' does not conform to ANSI C. */
Index: perm.c
===================================================================
--- perm.c.orig
+++ perm.c
@@ -106,18 +106,19 @@ user_in_file(const char *path, const cha
/* Global functions */
int
check_permission()
{
- uid_t uid = geteuid();
+ uid_t euid = geteuid(), uid=getuid(), egid=getegid(), gid=getgid();
struct passwd *pentry;
int allow = 0, deny = 1;
+ int retcode=0;
- if (uid == 0)
+ if (euid == 0)
return 1;
- if ((pentry = getpwuid(uid)) == NULL) {
+ if ((pentry = getpwuid(euid)) == NULL) {
perror("Cannot access user database");
exit(EXIT_FAILURE);
}
allow = user_in_file(ETCDIR "/at.allow", pentry->pw_name);
Index: configure.ac
===================================================================
--- configure.ac.orig
+++ configure.ac
@@ -265,7 +265,14 @@ AC_DEFINE(WITH_SELINUX),
)
AC_CHECK_LIB(selinux, is_selinux_enabled, SELINUXLIB=-lselinux)
AC_SUBST(SELINUXLIB)
AC_SUBST(WITH_SELINUX)
+AC_ARG_WITH(pam,
+[ --with-pam Define to enable pam support ],
+AC_DEFINE(WITH_PAM),
+)
+AC_CHECK_LIB(pam, pam_start, PAMLIB='-lpam -lpam_misc')
+AC_SUBST(PAMLIB)
+
AC_CONFIG_FILES(Makefile atrun atd.8 atrun.8 at.1 at.allow.5 batch)
AC_OUTPUT
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