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security: Inhibit execution of privilege escalating functions

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This patch allows individual dialplan functions to be marked as
'dangerous', to inhibit their execution from external sources.

A 'dangerous' function is one which results in a privilege escalation.
For example, if one were to read the channel variable SHELL(rm -rf /)
Bad Things(TM) could happen; even if the external source has only read
permissions.

Execution from external sources may be enabled by setting
'live_dangerously' to 'yes' in the [options] section of asterisk.conf.
Although doing so is not recommended.

Also, the ABI was changed to something more reasonable, since Asterisk
12 does not yet have a public release.

(closes issue ASTERISK-22905)
Review: http://reviewboard.digium.internal/r/432/
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Merged revisions 403913 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 403917 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 403959 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@403960 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
David M. Lee
2013-12-16 19:11:51 +00:00
parent 00dcee2a64
commit 744556c01d
12 changed files with 418 additions and 37 deletions
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28
funcs/func_env.c
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@@ -71,6 +71,11 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
<parameter name="filename" required="true" />
</syntax>
<description>
<note>
<para>If <literal>live_dangerously</literal> in <literal>asterisk.conf</literal>
is set to <literal>no</literal>, this function can only be executed from the
dialplan, and not directly from external protocols.</para>
</note>
</description>
</function>
<function name="FILE" language="en_US">
@@ -167,6 +172,11 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
<para> Set(FILE(/tmp/foo.txt,-1,,l)=bar)</para>
<para> ; Append "bar" to the file with a newline</para>
<para> Set(FILE(/tmp/foo.txt,,,al)=bar)</para>
<note>
<para>If <literal>live_dangerously</literal> in <literal>asterisk.conf</literal>
is set to <literal>no</literal>, this function can only be executed from the
dialplan, and not directly from external protocols.</para>
</note>
</description>
<see-also>
<ref type="function">FILE_COUNT_LINE</ref>
@@ -197,6 +207,11 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
</syntax>
<description>
<para>Returns the number of lines, or <literal>-1</literal> on error.</para>
<note>
<para>If <literal>live_dangerously</literal> in <literal>asterisk.conf</literal>
is set to <literal>no</literal>, this function can only be executed from the
dialplan, and not directly from external protocols.</para>
</note>
</description>
<see-also>
<ref type="function">FILE</ref>
@@ -216,6 +231,11 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
<para>'d' - DOS "\r\n" format</para>
<para>'m' - Macintosh "\r" format</para>
<para>'x' - Cannot be determined</para>
<note>
<para>If <literal>live_dangerously</literal> in <literal>asterisk.conf</literal>
is set to <literal>no</literal>, this function can only be executed from the
dialplan, and not directly from external protocols.</para>
</note>
</description>
<see-also>
<ref type="function">FILE</ref>
@@ -1259,10 +1279,10 @@ static int load_module(void)
int res = 0;
res |= ast_custom_function_register(&env_function);
res |= ast_custom_function_register(&stat_function);
res |= ast_custom_function_register(&file_function);
res |= ast_custom_function_register(&file_count_line_function);
res |= ast_custom_function_register(&file_format_function);
res |= ast_custom_function_register_escalating(&stat_function, AST_CFE_READ);
res |= ast_custom_function_register_escalating(&file_function, AST_CFE_BOTH);
res |= ast_custom_function_register_escalating(&file_count_line_function, AST_CFE_READ);
res |= ast_custom_function_register_escalating(&file_format_function, AST_CFE_READ);
return res;
}