1unconfined_sendmail_selSiEnLuixn(u8x)Policy unconfined_suenncdomnafiilned_sendmail_selinux(8)
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6 unconfined_sendmail_selinux - Security Enhanced Linux Policy for the
7 unconfined_sendmail processes
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10 Security-Enhanced Linux secures the unconfined_sendmail processes via
11 flexible mandatory access control.
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13 The unconfined_sendmail processes execute with the unconfined_send‐
14 mail_t SELinux type. You can check if you have these processes running
15 by executing the ps command with the -Z qualifier.
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17 For example:
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19 ps -eZ | grep unconfined_sendmail_t
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24 The unconfined_sendmail_t SELinux type can be entered via the send‐
25 mail_exec_t file type.
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27 The default entrypoint paths for the unconfined_sendmail_t domain are
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30 /usr/sbin/sendmail(.sendmail)?, /usr/bin/esmtp, /usr/sbin/rmail,
31 /usr/sbin/ssmtp, /usr/lib/sendmail, /usr/bin/esmtp-wrapper,
32 /var/qmail/bin/sendmail, /usr/sbin/sendmail.postfix
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35 SELinux defines process types (domains) for each process running on the
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38 You can see the context of a process using the -Z option to ps
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40 Policy governs the access confined processes have to files. SELinux
41 unconfined_sendmail policy is very flexible allowing users to setup
42 their unconfined_sendmail processes in as secure a method as possible.
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44 The following process types are defined for unconfined_sendmail:
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46 unconfined_sendmail_t
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48 Note: semanage permissive -a unconfined_sendmail_t can be used to make
49 the process type unconfined_sendmail_t permissive. SELinux does not
50 deny access to permissive process types, but the AVC (SELinux denials)
51 messages are still generated.
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55 SELinux policy is customizable based on least access required. uncon‐
56 fined_sendmail policy is extremely flexible and has several booleans
57 that allow you to manipulate the policy and run unconfined_sendmail
58 with the tightest access possible.
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62 If you want to deny user domains applications to map a memory region as
63 both executable and writable, this is dangerous and the executable
64 should be reported in bugzilla, you must turn on the deny_execmem bool‐
65 ean. Enabled by default.
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67 setsebool -P deny_execmem 1
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71 If you want to control the ability to mmap a low area of the address
72 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
73 the mmap_low_allowed boolean. Disabled by default.
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75 setsebool -P mmap_low_allowed 1
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79 If you want to disable kernel module loading, you must turn on the se‐
80 cure_mode_insmod boolean. Enabled by default.
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82 setsebool -P secure_mode_insmod 1
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86 If you want to allow unconfined executables to make their heap memory
87 executable. Doing this is a really bad idea. Probably indicates a
88 badly coded executable, but could indicate an attack. This executable
89 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
90 echeap boolean. Disabled by default.
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92 setsebool -P selinuxuser_execheap 1
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96 If you want to allow unconfined executables to make their stack exe‐
97 cutable. This should never, ever be necessary. Probably indicates a
98 badly coded executable, but could indicate an attack. This executable
99 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
100 stack boolean. Enabled by default.
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102 setsebool -P selinuxuser_execstack 1
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107 The SELinux process type unconfined_sendmail_t can manage files labeled
108 with the following file types. The paths listed are the default paths
109 for these file types. Note the processes UID still need to have DAC
110 permissions.
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112 file_type
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114 all files on the system
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118 semanage fcontext can also be used to manipulate default file context
119 mappings.
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121 semanage permissive can also be used to manipulate whether or not a
122 process type is permissive.
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124 semanage module can also be used to enable/disable/install/remove pol‐
125 icy modules.
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127 semanage boolean can also be used to manipulate the booleans
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130 system-config-selinux is a GUI tool available to customize SELinux pol‐
131 icy settings.
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135 This manual page was auto-generated using sepolicy manpage .
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139 selinux(8), unconfined_sendmail(8), semanage(8), restorecon(8),
140 chcon(1), sepolicy(8), setsebool(8)
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144unconfined_sendmail 23-02-03 unconfined_sendmail_selinux(8)