build: simplify code related to man pages

Simplify the main targets and use wildcards instead of repeating the
filenames manually.

Also, restore the `man` target and building only when `HAVE_MAN` is
enabled.

Note: Make automatically removes intermediate files (.1 and .5), so in
general only the .gz files have to be cleaned.

Commands used to rename the man pages:

    cd src/man
    git mv firecfg.txt firecfg.1.in
    git mv firejail-login.txt firejail-login.5.in
    git mv firejail-profile.txt firejail-profile.5.in
    git mv firejail-users.txt firejail-users.5.in
    git mv firejail.txt firejail.1.in
    git mv firemon.txt firemon.1.in
    git mv jailcheck.txt jailcheck.1.in

This is kind of a follow-up to commit 9e206b7f2 ("rework src/man
Makefile", 2023-07-07).

1 files changed, 63 insertions, 0 deletions

diff --git a/src/man/firejail-users.5.in b/src/man/firejail-users.5.in
new file mode 100644
index 000000000..7aa151680
--- /dev/null
+++ b/src/man/firejail-users.5.in
@@ -0,0 +1,63 @@
+.TH FIREJAIL-USERS 5 "MONTH YEAR" "VERSION" "firejail.users man page"
+.SH NAME
+firejail.users \- Firejail user access database
+
+.SH DESCRIPTION
+/etc/firejail/firejail.users lists the users allowed to run firejail SUID executable.
+root user is allowed by default, user nobody is never allowed.
+
+If the user is not allowed to start the sandbox, Firejail will attempt to run the
+program without sandboxing it.
+
+If the file is not present in the system, all users are allowed to use the sandbox.
+
+Example:
+
+        $ cat /etc/firejail/firejail.users
+.br
+        dustin
+.br
+        lucas
+.br
+        mike
+.br
+        eleven
+
+Use a text editor to add or remove users from the list. You can also use firecfg \-\-add-users
+command. Example:
+
+        $ sudo firecfg --add-users dustin lucas mike eleven
+
+By default, running firecfg creates the file and adds the current user to the list. Example:
+
+        $ sudo firecfg
+
+See \fBman 1 firecfg\fR for details.
+
+.SH ALTERNATIVE SOLUTION
+An alternative way of restricting user access to firejail executable is to create a special firejail user group and
+allow only users in this group to run the sandbox:
+
+        # addgroup --system firejail
+.br
+        # chown root:firejail /usr/bin/firejail
+.br
+        # chmod 4750 /usr/bin/firejail
+
+
+.SH FILES
+/etc/firejail/firejail.users
+
+.SH LICENSE
+Firejail is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
+.PP
+Homepage: https://firejail.wordpress.com
+.SH SEE ALSO
+.BR firejail (1),
+.BR firemon (1),
+.BR firecfg (1),
+.BR firejail-profile (5),
+.BR firejail-login (5),
+.BR jailcheck (1)
+.\" vim: set filetype=groff :