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authorJo-Philipp Wich <jo@mein.io>2020-08-05 09:07:00 +0200
committerJo-Philipp Wich <jo@mein.io>2020-08-07 11:05:16 +0200
commit4a6795409d1520fd3da3e909a8bcf9d7fd0927bb (patch)
treea13685a1c4d6e2e18aa1c2742963d147c2b21dc4 /package/base-files/files/lib/functions.sh
parent0c109df7f02723b3cc59700ef15c1d19e0bcd0f0 (diff)
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base-files: functions.sh: fix config_get() on invalid identifiers
When passing a section or option value to config_get() which contains characters that happen to be valid variable interpolation expressions, the function returns a nonsensical expression result instead of the expected empty string. When the passed section or option name contains other characters which are not valid within a shell variable name, a substitution error is occuring instead. The issue can be easily reproduced by one of the following examples: root@OpenWrt:~# . /lib/functions.sh root@OpenWrt:~# config load system root@OpenWrt:~# config_get variable invalid-section option root@OpenWrt:~# echo "$variable" section_option:- root@OpenWrt:~# . /lib/functions.sh root@OpenWrt:~# config load system root@OpenWrt:~# config_get variable section invalid-option root@OpenWrt:~# echo "$variable" option:- root@OpenWrt:~# . /lib/functions.sh root@OpenWrt:~# config load system root@OpenWrt:~# config_get variable section invalid@option -ash: eval: syntax error: bad substitution Fix this issue by only performing interpolations when the given section and option arguments are free of illegal characters. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Diffstat (limited to 'package/base-files/files/lib/functions.sh')
-rwxr-xr-xpackage/base-files/files/lib/functions.sh11
1 files changed, 8 insertions, 3 deletions
diff --git a/package/base-files/files/lib/functions.sh b/package/base-files/files/lib/functions.sh
index 323e057451..7da0c872fa 100755
--- a/package/base-files/files/lib/functions.sh
+++ b/package/base-files/files/lib/functions.sh
@@ -107,9 +107,14 @@ config_unset() {
# config_get <variable> <section> <option> [<default>]
# config_get <section> <option>
config_get() {
- case "$3" in
- "") eval echo "\"\${CONFIG_${1}_${2}:-\${4}}\"";;
- *) eval export ${NO_EXPORT:+-n} -- "${1}=\${CONFIG_${2}_${3}:-\${4}}";;
+ case "$2${3:-$1}" in
+ *[^A-Za-z0-9_]*) : ;;
+ *)
+ case "$3" in
+ "") eval echo "\"\${CONFIG_${1}_${2}:-\${4}}\"";;
+ *) eval export ${NO_EXPORT:+-n} -- "${1}=\${CONFIG_${2}_${3}:-\${4}}";;
+ esac
+ ;;
esac
}