2005-04-15 16:46:39 +00:00
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--- coreutils-5.2.1/src/Makefile.am.pam 2005-04-15 17:03:44.000000000 +0100
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+++ coreutils-5.2.1/src/Makefile.am 2005-04-15 17:03:44.000000000 +0100
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2004-09-09 03:58:39 +00:00
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@@ -66,7 +66,7 @@
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uptime_LDADD = $(LDADD) $(GETLOADAVG_LIBS)
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-su_LDADD = $(LDADD) $(LIB_CRYPT)
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+su_LDADD = $(LDADD) $(LIB_CRYPT) @LIB_PAM@
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$(PROGRAMS): ../lib/libfetish.a
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2005-04-15 16:46:39 +00:00
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--- coreutils-5.2.1/src/su.c.pam 2005-04-15 17:03:44.000000000 +0100
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+++ coreutils-5.2.1/src/su.c 2005-04-15 17:04:52.000000000 +0100
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2004-09-09 03:58:39 +00:00
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@@ -38,6 +38,16 @@
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restricts who can su to UID 0 accounts. RMS considers that to
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be fascist.
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+#ifdef USE_PAM
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+
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+ Actually, with PAM, su has nothing to do with whether or not a
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+ wheel group is enforced by su. RMS tries to restrict your access
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+ to a su which implements the wheel group, but PAM considers that
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+ to be fascist, and gives the user/sysadmin the opportunity to
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+ enforce a wheel group by proper editing of /etc/pam.conf
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+
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+#endif
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+
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Options:
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-, -l, --login Make the subshell a login shell.
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Unset all environment variables except
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2005-04-15 16:46:39 +00:00
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@@ -81,6 +91,15 @@
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2004-09-09 03:58:39 +00:00
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prototype (returning `int') in <unistd.h>. */
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#define getusershell _getusershell_sys_proto_
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+#ifdef USE_PAM
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+# include <signal.h>
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+# include <sys/wait.h>
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+# include <sys/fsuid.h>
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2005-04-15 16:46:39 +00:00
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+# include <unistd.h>
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2005-03-15 13:52:17 +00:00
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+# include <security/pam_appl.h>
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+# include <security/pam_misc.h>
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2004-09-09 03:58:39 +00:00
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+#endif /* USE_PAM */
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+
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#include "system.h"
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#include "dirname.h"
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2005-04-15 16:46:39 +00:00
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@@ -150,7 +169,9 @@
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2004-09-09 03:58:39 +00:00
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/* The user to become if none is specified. */
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#define DEFAULT_USER "root"
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+#ifndef USE_PAM
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char *crypt ();
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+#endif
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char *getpass ();
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char *getusershell ();
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void endusershell ();
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2005-04-15 16:46:39 +00:00
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@@ -158,8 +179,12 @@
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2004-09-09 03:58:39 +00:00
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extern char **environ;
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-static void run_shell (const char *, const char *, char **)
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+static void run_shell (const char *, const char *, char **, const struct passwd *)
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+#ifdef USE_PAM
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+ ;
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+#else
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ATTRIBUTE_NORETURN;
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+#endif
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/* The name this program was run with. */
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char *program_name;
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2005-04-15 16:46:39 +00:00
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@@ -271,7 +296,22 @@
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2004-09-09 03:58:39 +00:00
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}
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#endif
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+#ifdef USE_PAM
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+static pam_handle_t *pamh = NULL;
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+static int retval;
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+static struct pam_conv conv = {
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+ misc_conv,
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+ NULL
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+};
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+
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+#define PAM_BAIL_P if (retval) { \
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+ pam_end(pamh, PAM_SUCCESS); \
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+ return 0; \
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+}
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+#endif
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+
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/* Ask the user for a password.
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+ If PAM is in use, let PAM ask for the password if necessary.
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Return 1 if the user gives the correct password for entry PW,
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0 if not. Return 1 without asking for a password if run by UID 0
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or if PW has an empty password. */
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2005-04-15 16:46:39 +00:00
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@@ -279,6 +319,42 @@
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2004-09-09 03:58:39 +00:00
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static int
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correct_password (const struct passwd *pw)
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{
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+#ifdef USE_PAM
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+ struct passwd *caller;
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2005-04-15 16:46:39 +00:00
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+ char *tty_name, *ttyn;
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2004-09-09 03:58:39 +00:00
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+ retval = pam_start(PROGRAM_NAME, pw->pw_name, &conv, &pamh);
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+ PAM_BAIL_P;
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+
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+ if (getuid() != 0 && !isatty(0)) {
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+ fprintf(stderr, "standard in must be a tty\n");
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+ exit(1);
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+ }
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+
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+ caller = getpwuid(getuid());
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+ if(caller != NULL && caller->pw_name != NULL) {
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+ retval = pam_set_item(pamh, PAM_RUSER, caller->pw_name);
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+ PAM_BAIL_P;
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+ }
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+
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2005-04-15 16:46:39 +00:00
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+ ttyn = ttyname(0);
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+ if (strncmp(ttyn, "/dev/", 5) == 0)
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+ tty_name = ttyn+5;
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+ else
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+ tty_name = ttyn;
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+ retval = pam_set_item(pamh, PAM_TTY, tty_name);
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+ PAM_BAIL_P;
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2004-09-09 03:58:39 +00:00
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+ retval = pam_authenticate(pamh, 0);
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+ PAM_BAIL_P;
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+ retval = pam_acct_mgmt(pamh, 0);
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+ if (retval == PAM_NEW_AUTHTOK_REQD) {
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+ /* password has expired. Offer option to change it. */
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+ retval = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
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+ PAM_BAIL_P;
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+ }
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+ PAM_BAIL_P;
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+ /* must be authenticated if this point was reached */
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+ return 1;
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+#else /* !USE_PAM */
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char *unencrypted, *encrypted, *correct;
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#if HAVE_GETSPNAM && HAVE_STRUCT_SPWD_SP_PWDP
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/* Shadow passwd stuff for SVR3 and maybe other systems. */
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2005-04-15 16:46:39 +00:00
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@@ -303,6 +379,7 @@
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2004-09-09 03:58:39 +00:00
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encrypted = crypt (unencrypted, correct);
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memset (unencrypted, 0, strlen (unencrypted));
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return strcmp (encrypted, correct) == 0;
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+#endif /* !USE_PAM */
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}
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/* Update `environ' for the new shell based on PW, with SHELL being
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2005-04-15 16:46:39 +00:00
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@@ -312,16 +389,24 @@
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2004-09-09 03:58:39 +00:00
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modify_environment (const struct passwd *pw, const char *shell)
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{
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char *term;
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+ char *display;
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+ char *xauthority;
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if (simulate_login)
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{
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- /* Leave TERM unchanged. Set HOME, SHELL, USER, LOGNAME, PATH.
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+ /* Leave TERM, DISPLAY, XAUTHORITY unchanged. Set HOME, SHELL, USER, LOGNAME, PATH.
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Unset all other environment variables. */
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term = getenv ("TERM");
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+ display = getenv ("DISPLAY");
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+ xauthority = getenv ("XAUTHORITY");
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environ = xmalloc (2 * sizeof (char *));
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environ[0] = 0;
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if (term)
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xputenv (concat ("TERM", "=", term));
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+ if (display)
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+ xputenv (concat ("DISPLAY", "=", display));
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+ if (xauthority)
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+ xputenv (concat ("XAUTHORITY", "=", xauthority));
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xputenv (concat ("HOME", "=", pw->pw_dir));
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xputenv (concat ("SHELL", "=", shell));
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xputenv (concat ("USER", "=", pw->pw_name));
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2005-04-15 16:46:39 +00:00
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@@ -354,8 +439,13 @@
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{
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#ifdef HAVE_INITGROUPS
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errno = 0;
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- if (initgroups (pw->pw_name, pw->pw_gid) == -1)
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+ if (initgroups (pw->pw_name, pw->pw_gid) == -1) {
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+#ifdef USE_PAM
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+ pam_close_session(pamh, 0);
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+ pam_end(pamh, PAM_ABORT);
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+#endif
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2004-09-09 03:58:39 +00:00
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error (EXIT_FAIL, errno, _("cannot set groups"));
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2005-04-15 16:46:39 +00:00
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+ }
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2004-09-09 03:58:39 +00:00
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endgrent ();
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#endif
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if (setgid (pw->pw_gid))
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2005-04-15 16:46:39 +00:00
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@@ -364,16 +454,69 @@
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2004-09-09 03:58:39 +00:00
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error (EXIT_FAIL, errno, _("cannot set user id"));
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}
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+#ifdef USE_PAM
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+static int caught=0;
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+/* Signal handler for parent process later */
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+static void su_catch_sig(int sig)
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+{
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+ ++caught;
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+}
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+
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+int
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+pam_copyenv (pam_handle_t *pamh)
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+{
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+ char **env;
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+
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+ env = pam_getenvlist(pamh);
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+ if(env) {
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+ while(*env) {
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+ xputenv(*env);
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+ env++;
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+ }
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+ }
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+ return(0);
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+}
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+#endif
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+
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/* Run SHELL, or DEFAULT_SHELL if SHELL is empty.
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If COMMAND is nonzero, pass it to the shell with the -c option.
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If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
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arguments. */
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static void
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-run_shell (const char *shell, const char *command, char **additional_args)
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+run_shell (const char *shell, const char *command, char **additional_args, const struct passwd *pw)
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{
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const char **args;
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int argno = 1;
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+#ifdef USE_PAM
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+ int child;
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+ sigset_t ourset;
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+ int status;
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+
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+ retval = pam_open_session(pamh,0);
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+ if (retval != PAM_SUCCESS) {
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+ fprintf (stderr, "could not open session\n");
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+ exit (1);
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+ }
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+
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+/* do this at the last possible moment, because environment variables may
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+ be passed even in the session phase
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+*/
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+ if(pam_copyenv(pamh) != PAM_SUCCESS)
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+ fprintf (stderr, "error copying PAM environment\n");
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+
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2005-04-15 16:46:39 +00:00
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+ /* Credentials should be set in the parent */
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+ if (pam_setcred(pamh, PAM_ESTABLISH_CRED) != PAM_SUCCESS) {
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+ pam_close_session(pamh, 0);
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+ fprintf(stderr, "could not set PAM credentials\n");
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+ exit(1);
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+ }
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+
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2004-09-09 03:58:39 +00:00
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+ child = fork();
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+ if (child == 0) { /* child shell */
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+ change_identity (pw);
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+ pam_end(pamh, 0);
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+#endif
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if (additional_args)
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args = xmalloc (sizeof (char *)
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2005-04-15 16:46:39 +00:00
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@@ -385,6 +528,9 @@
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2004-09-09 03:58:39 +00:00
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char *arg0;
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char *shell_basename;
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+ if(chdir(pw->pw_dir))
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+ error(0, errno, _("warning: cannot change directory to %s"), pw->pw_dir);
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+
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shell_basename = base_name (shell);
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arg0 = xmalloc (strlen (shell_basename) + 2);
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arg0[0] = '-';
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2005-04-15 16:46:39 +00:00
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@@ -411,6 +557,66 @@
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2004-09-09 03:58:39 +00:00
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error (0, errno, "%s", shell);
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exit (exit_status);
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}
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+#ifdef USE_PAM
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+ } else if (child == -1) {
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+ fprintf(stderr, "can not fork user shell: %s", strerror(errno));
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2005-04-15 16:46:39 +00:00
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+ pam_setcred(pamh, PAM_DELETE_CRED | PAM_SILENT);
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+ pam_close_session(pamh, 0);
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+ pam_end(pamh, PAM_ABORT);
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2004-09-09 03:58:39 +00:00
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+ exit(1);
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+ }
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+ /* parent only */
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+ sigfillset(&ourset);
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+ if (sigprocmask(SIG_BLOCK, &ourset, NULL)) {
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+ fprintf(stderr, "%s: signal malfunction\n", PROGRAM_NAME);
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+ caught = 1;
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+ }
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+ if (!caught) {
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+ struct sigaction action;
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+ action.sa_handler = su_catch_sig;
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+ sigemptyset(&action.sa_mask);
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+ action.sa_flags = 0;
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+ sigemptyset(&ourset);
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+ if (sigaddset(&ourset, SIGTERM)
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+ || sigaddset(&ourset, SIGALRM)
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+ || sigaction(SIGTERM, &action, NULL)
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+ || sigprocmask(SIG_UNBLOCK, &ourset, NULL)) {
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+ fprintf(stderr, "%s: signal masking malfunction\n", PROGRAM_NAME);
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+ caught = 1;
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+ }
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+ }
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+ if (!caught) {
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+ do {
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+ int pid;
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+
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+ pid = waitpid(-1, &status, WUNTRACED);
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+
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+ if (WIFSTOPPED(status)) {
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+ kill(getpid(), SIGSTOP);
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+ /* once we get here, we must have resumed */
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+ kill(pid, SIGCONT);
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+ }
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+ } while (WIFSTOPPED(status));
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+ }
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+
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+ if (caught) {
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+ fprintf(stderr, "\nSession terminated, killing shell...");
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+ kill (child, SIGTERM);
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+ }
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2005-04-15 16:46:39 +00:00
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+ /* Not checking retval on this because we need to call close session */
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+ pam_setcred(pamh, PAM_DELETE_CRED | PAM_SILENT);
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2004-09-09 03:58:39 +00:00
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+ retval = pam_close_session(pamh, 0);
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+ PAM_BAIL_P;
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+ retval = pam_end(pamh, PAM_SUCCESS);
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+ PAM_BAIL_P;
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+ if (caught) {
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+ sleep(2);
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+ kill(child, SIGKILL);
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+ fprintf(stderr, " ...killed.\n");
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+ exit(-1);
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+ }
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|
|
+ exit (WEXITSTATUS(status));
|
|
|
|
+#endif /* USE_PAM */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Return 1 if SHELL is a restricted shell (one not returned by
|
2005-04-15 16:46:39 +00:00
|
|
|
@@ -586,9 +792,10 @@
|
|
|
|
}
|
|
|
|
modify_environment (pw, shell);
|
2004-09-09 03:58:39 +00:00
|
|
|
|
|
|
|
+
|
2004-12-06 15:51:03 +00:00
|
|
|
+#ifndef USE_PAM
|
2004-09-09 03:58:39 +00:00
|
|
|
change_identity (pw);
|
|
|
|
- if (simulate_login && chdir (pw->pw_dir))
|
|
|
|
- error (0, errno, _("warning: cannot change directory to %s"), pw->pw_dir);
|
|
|
|
+#endif
|
|
|
|
|
|
|
|
- run_shell (shell, command, additional_args);
|
|
|
|
+ run_shell (shell, command, additional_args, pw);
|
|
|
|
}
|
2005-04-15 16:46:39 +00:00
|
|
|
--- coreutils-5.2.1/doc/coreutils.texi.pam 2005-04-15 17:03:44.000000000 +0100
|
|
|
|
+++ coreutils-5.2.1/doc/coreutils.texi 2005-04-15 17:03:44.000000000 +0100
|
|
|
|
@@ -11850,8 +11850,11 @@
|
2004-09-09 04:01:07 +00:00
|
|
|
@findex syslog
|
|
|
|
@command{su} can optionally be compiled to use @code{syslog} to report
|
|
|
|
failed, and optionally successful, @command{su} attempts. (If the system
|
|
|
|
-supports @code{syslog}.) However, GNU @command{su} does not check if the
|
|
|
|
-user is a member of the @code{wheel} group; see below.
|
|
|
|
+supports @code{syslog}.)
|
|
|
|
+
|
|
|
|
+This version of @command{su} has support for using PAM for
|
|
|
|
+authentication. You can edit @file{/etc/pam.d/su} to customize its
|
|
|
|
+behaviour.
|
|
|
|
|
|
|
|
The program accepts the following options. Also see @ref{Common options}.
|
|
|
|
|
2005-04-15 16:46:39 +00:00
|
|
|
@@ -11932,33 +11935,6 @@
|
2004-09-09 04:01:07 +00:00
|
|
|
the exit status of the subshell otherwise
|
|
|
|
@end display
|
|
|
|
|
|
|
|
-@cindex wheel group, not supported
|
|
|
|
-@cindex group wheel, not supported
|
|
|
|
-@cindex fascism
|
|
|
|
-@subsection Why GNU @command{su} does not support the @samp{wheel} group
|
|
|
|
-
|
|
|
|
-(This section is by Richard Stallman.)
|
|
|
|
-
|
|
|
|
-@cindex Twenex
|
|
|
|
-@cindex MIT AI lab
|
|
|
|
-Sometimes a few of the users try to hold total power over all the
|
|
|
|
-rest. For example, in 1984, a few users at the MIT AI lab decided to
|
|
|
|
-seize power by changing the operator password on the Twenex system and
|
|
|
|
-keeping it secret from everyone else. (I was able to thwart this coup
|
|
|
|
-and give power back to the users by patching the kernel, but I
|
|
|
|
-wouldn't know how to do that in Unix.)
|
|
|
|
-
|
|
|
|
-However, occasionally the rulers do tell someone. Under the usual
|
|
|
|
-@command{su} mechanism, once someone learns the root password who
|
|
|
|
-sympathizes with the ordinary users, he or she can tell the rest. The
|
|
|
|
-``wheel group'' feature would make this impossible, and thus cement the
|
|
|
|
-power of the rulers.
|
|
|
|
-
|
|
|
|
-I'm on the side of the masses, not that of the rulers. If you are
|
|
|
|
-used to supporting the bosses and sysadmins in whatever they do, you
|
|
|
|
-might find this idea strange at first.
|
|
|
|
-
|
|
|
|
-
|
|
|
|
@node Process control
|
|
|
|
@chapter Process control
|
|
|
|
|
2005-04-15 16:46:39 +00:00
|
|
|
--- coreutils-5.2.1/configure.ac.pam 2005-04-15 17:03:44.000000000 +0100
|
|
|
|
+++ coreutils-5.2.1/configure.ac 2005-04-15 17:03:44.000000000 +0100
|
|
|
|
@@ -7,6 +7,13 @@
|
|
|
|
|
|
|
|
AM_INIT_AUTOMAKE([1.8 gnits dist-bzip2])
|
|
|
|
|
|
|
|
+dnl Give the chance to enable PAM
|
|
|
|
+AC_ARG_ENABLE(pam, dnl
|
|
|
|
+[ --enable-pam Enable use of the PAM libraries],
|
|
|
|
+[AC_DEFINE(USE_PAM, 1, [Define if you want to use PAM])
|
|
|
|
+LIB_PAM="-ldl -lpam -lpam_misc"
|
|
|
|
+AC_SUBST(LIB_PAM)])
|
|
|
|
+
|
|
|
|
gl_DEFAULT_POSIX2_VERSION
|
|
|
|
gl_USE_SYSTEM_EXTENSIONS
|
|
|
|
jm_PERL
|
|
|
|
--- coreutils-5.2.1/config.hin.pam 2005-04-15 17:03:44.000000000 +0100
|
|
|
|
+++ coreutils-5.2.1/config.hin 2005-04-15 17:03:44.000000000 +0100
|
|
|
|
@@ -1365,6 +1365,9 @@
|
|
|
|
/* Define if you want access control list support. */
|
|
|
|
#undef USE_ACL
|
|
|
|
|
|
|
|
+/* Define if you want to use PAM */
|
|
|
|
+#undef USE_PAM
|
|
|
|
+
|
|
|
|
/* Version number of package */
|
|
|
|
#undef VERSION
|
|
|
|
|