pager: make pager secure when under euid is changed or explicitly req…

…uested

The variable is renamed to SYSTEMD_PAGERSECURE (because it's not just about
less now), and we automatically enable secure mode in certain cases, but not
otherwise.

This approach is more nuanced, but should provide a better experience for
users:

- Previusly we would set LESSSECURE=1 and trust the pager to make use of
  it. But this has an effect only on less. We need to not start pagers which
  are insecure when in secure mode. In particular more is like that and is a
  very popular pager.

- We don't enable secure mode always, which means that those other pagers can
  reasonably used.

- We do the right thing by default, but the user has ultimate control by
  setting SYSTEMD_PAGERSECURE.

Fixes #5666.

v2:
- also check $PKEXEC_UID

v3:
- use 'sd_pid_get_owner_uid() != geteuid()' as the condition

Based on: 0a42426

rhel-only

Resolves: RHEL-35665

man/less-variables.xml

@@ -27,12 +27,30 @@
                 </varlistentry>
 
                 <varlistentry id='lesssecure'>
-                        <term><varname>$SYSTEMD_LESSSECURE</varname></term>
-
-                        <listitem><para>Takes a boolean argument. Overrides the <varname>$LESSSECURE</varname> environment
-                        variable when invoking the pager, which controls the "secure" mode of less (which disables commands
-                        such as <literal>|</literal> which allow to easily shell out to external command lines). By default
-                        less secure mode is enabled, with this setting it may be disabled.</para></listitem>
+                        <term><varname>$SYSTEMD_PAGERSECURE</varname></term>
+
+                        <listitem><para>Takes a boolean argument. When true, the "secure" mode of the pager is enabled; if
+                        false, disabled. If <varname>$SYSTEMD_PAGERSECURE</varname> is not set at all, secure mode is enabled
+                        if the effective UID is not the same as the owner of the login session, see <citerefentry
+                        project='man-pages'><refentrytitle>geteuid</refentrytitle><manvolnum>2</manvolnum></citerefentry> and
+                        <citerefentry><refentrytitle>sd_pid_get_owner_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
+                        In secure mode, <option>LESSSECURE=1</option> will be set when invoking the pager, and the pager shall
+                        disable commands that open or create new files or start new subprocesses. When
+                        <varname>$SYSTEMD_PAGERSECURE</varname> is not set at all, pagers which are not known to implement
+                        secure mode will not be used. (Currently only
+                        <citerefentry><refentrytitle>less</refentrytitle><manvolnum>1</manvolnum></citerefentry> implements
+                        secure mode.)</para>
+
+                        <para>Note: when commands are invoked with elevated privileges, for example under <citerefentry
+                        project='man-pages'><refentrytitle>sudo</refentrytitle><manvolnum>8</manvolnum></citerefentry> or
+                        <citerefentry
+                        project='die-net'><refentrytitle>pkexec</refentrytitle><manvolnum>1</manvolnum></citerefentry>, care
+                        must be taken to ensure that unintended interactive features are not enabled. "Secure" mode for the
+                        pager may be enabled automatically as describe above. Setting <varname>SYSTEMD_PAGERSECURE=0</varname>
+                        or not removing it from the inherited environment allows the user to invoke arbitrary commands. Note
+                        that if the <varname>$SYSTEMD_PAGER</varname> or <varname>$PAGER</varname> variables are to be
+                        honoured, <varname>$SYSTEMD_PAGERSECURE</varname> must be set too. It might be reasonable to completly
+                        disable the pager using <option>--no-pager</option> instead.</para></listitem>
                 </varlistentry>
 
         </variablelist>

src/shared/pager.c

@@ -26,10 +26,13 @@
 #include <string.h>
 #include <sys/prctl.h>
 
+#include "cgroup-util.h" /* cg_pid_get_owner_uid() */
+
 #include "env-util.h"
 #include "pager.h"
 #include "util.h"
 #include "macro.h"
+#include "strv.h"
 
 static pid_t pager_pid = 0;
 
@@ -48,6 +51,16 @@ noreturn static void pager_fallback(void) {
         _exit(EXIT_SUCCESS);
 }
 
+/* Custom wrapper replacing sd_pid_get_owner_uid() from sd-login.h
+ * added to avoid having to include sd-login.h that causes linking problems */
+static int pg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
+
+        assert_return(pid >= 0, -EINVAL);
+        assert_return(uid, -EINVAL);
+
+        return cg_pid_get_owner_uid(pid, uid);
+}
+
 int pager_open(bool jump_to_end) {
         int fd[2];
         const char *pager;
@@ -83,7 +96,9 @@ int pager_open(bool jump_to_end) {
 
         /* In the child start the pager */
         if (pager_pid == 0) {
-                const char* less_opts;
+                const char* less_opts, *exe;
+                int use_secure_mode;
+                bool trust_pager;
 
                 dup2(fd[0], STDIN_FILENO);
                 safe_close_pair(fd);
@@ -105,39 +120,57 @@ int pager_open(bool jump_to_end) {
                         _exit(EXIT_SUCCESS);
 
                 /* People might invoke us from sudo, don't needlessly allow less to be a way to shell out
-                 * privileged stuff. */
-                r = getenv_bool("SYSTEMD_LESSSECURE");
-                if (r == 0) { /* Remove env var if off */
-                        if (unsetenv("LESSSECURE") < 0) {
-                                log_error_errno(errno, "Failed to uset environment variable LESSSECURE: %m");
-                                _exit(EXIT_FAILURE);
-                        }
-                } else {
-                        /* Set env var otherwise */
+                 * privileged stuff. If the user set $SYSTEMD_PAGERSECURE, trust their configuration of the
+                 * pager. If they didn't, use secure mode when under euid is changed. If $SYSTEMD_PAGERSECURE
+                 * wasn't explicitly set, and we autodetect the need for secure mode, only use the pager we
+                 * know to be good. */
+                use_secure_mode = getenv_bool("SYSTEMD_PAGERSECURE");
+                trust_pager = use_secure_mode >= 0;
+
+                if (use_secure_mode == -ENXIO) {
+                        uid_t uid;
+
+                        r = pg_pid_get_owner_uid(0, &uid);
                         if (r < 0)
-                                log_warning_errno(r, "Unable to parse $SYSTEMD_LESSSECURE, ignoring: %m");
+                                log_debug_errno(r, "pg_pid_get_owner_uid() failed, enabling pager secure mode: %m");
 
-                        if (setenv("LESSSECURE", "1", 1) < 0) {
-                                log_error_errno(errno, "Failed to set environment variable LESSSECURE: %m");
-                                _exit(EXIT_FAILURE);
-                        }
+                        use_secure_mode = r < 0 || uid != geteuid();
+
+                } else if (use_secure_mode < 0) {
+                        log_warning_errno(use_secure_mode, "Unable to parse $SYSTEMD_PAGERSECURE, assuming true: %m");
+                        use_secure_mode = true;
                 }
 
-                if (pager) {
+                /* We generally always set variables used by less, even if we end up using a different pager.
+                 * They shouldn't hurt in any case, and ideally other pagers would look at them too. */
+                if (use_secure_mode)
+                        r = setenv("LESSSECURE", "1", 1);
+                else
+                        r = unsetenv("LESSSECURE");
+                if (r < 0) {
+                        log_error_errno(errno, "Failed to adjust environment variable LESSSECURE: %m");
+                        _exit(EXIT_FAILURE);
+                }
+
+                if (trust_pager && pager) { /* The pager config might be set globally, and we cannot
+                                                  * know if the user adjusted it to be appropriate for the
+                                                  * secure mode. Thus, start the pager specified through
+                                                  * envvars only when $SYSTEMD_PAGERSECURE was explicitly set
+                                                  * as well. */
                         execlp(pager, pager, NULL);
                         execl("/bin/sh", "sh", "-c", pager, NULL);
                 }
 
-                /* Debian's alternatives command for pagers is
-                 * called 'pager'. Note that we do not call
-                 * sensible-pagers here, since that is just a
-                 * shell script that implements a logic that
-                 * is similar to this one anyway, but is
-                 * Debian-specific. */
-                execlp("pager", "pager", NULL);
+                /* Debian's alternatives command for pagers is called 'pager'. Note that we do not call
+                 * sensible-pagers here, since that is just a shell script that implements a logic that is
+                 * similar to this one anyway, but is Debian-specific. */
+                FOREACH_STRING(exe, "pager", "less", "more") {
+                        /* Only less implements secure mode right now. */
+                        if (use_secure_mode && !streq(exe, "less"))
+                                continue;
 
-                execlp("less", "less", NULL);
-                execlp("more", "more", NULL);
+                        execlp(exe, exe, NULL);
+                }
 
                 pager_fallback();
                 /* not reached */