[PATCH 3/3] initscripts: readhash: Fix handling = signs

[Michael Tremer <michael.tremer@ipfire.org>]

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The function expected that a line only contains exactly one equals sign
(=) which is not fit for purpose. In the WireGuard code we hold key
material that is encoded in base64 and therefore contains padding that
uses =.

This patch fixes that we expect exactly one equals sign immediately
after the key and we will then accept more = in the value - which was
already permitted.

Furthermore, this patch fixes the splitting if the key and value at the
first =.

Signed-off-by: Michael Tremer <michael.tremer(a)ipfire.org>
---
 src/initscripts/system/functions                     | 12 +++---------
 .../system/functions/data/2_output_stderr            |  8 ++++----
 2 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/src/initscripts/system/functions b/src/initscripts/system/functions
index 094e35495..e486cc085 100644
--- a/src/initscripts/system/functions
+++ b/src/initscripts/system/functions
@@ -909,21 +909,15 @@ readhash() {
 			continue
 		fi
 
-		# Skip lines without a =
-		if ! [[ ${line} =~ [^=]*=[^=]*$ ]]; then
+		# Check for a valid key followed by =
+		if ! [[ ${line} =~ ^[A-Za-z_][A-Za-z0-9_]*= ]]; then
 			echo "Invalid line '${line}'" >&2
 			continue
 		fi
 
-		local key="${line%=*}"
+		local key="${line%%=*}"
 		local val="${line#*=}"
 
-		# Skip lines with an invalid key
-		if ! [[ ${key} =~ ^[A-Za-z_][A-Za-z0-9_]*$ ]]; then
-			echo "Invalid key '${key}'" >&2
-			continue
-		fi
-
 		# Skip lines with invalid values
 		if ! [[ ${val} =~ ^[\'][\ A-Za-z0-9=/,.:%_@#+-]*[\']$ ]] && ! [[ ${val} =~ ^[A-Za-z0-9=/,.:%_@#+-]*$ ]]; then
 			echo "Invalid value '${val}' for key '${key}'" >&2
diff --git a/tests/src/initscripts/system/functions/data/2_output_stderr b/tests/src/initscripts/system/functions/data/2_output_stderr
index 82f035e26..7f4c5a944 100644
--- a/tests/src/initscripts/system/functions/data/2_output_stderr
+++ b/tests/src/initscripts/system/functions/data/2_output_stderr
@@ -2,8 +2,8 @@ Invalid value '?3' for key 'CONFIG_TYPE'
 Invalid value 'gree!n0' for key 'GREEN_DEV'
 Invalid value '00:c0:08:8a  :a0:47' for key 'GREEN_MACADDR'
 Invalid value '"r8175"' for key 'GREEN_DRIVER'
-Invalid key '-RED_DEV'
-Invalid key 'RE??D_MACADDR'
-Invalid key 'RED&&_DRIVER'
-Invalid key '0BLUE_DEV'
+Invalid line '-RED_DEV=red0'
+Invalid line 'RE??D_MACADDR=00:c0:08:8a:a0:56'
+Invalid line 'RED&&_DRIVER=r8283'
+Invalid line '0BLUE_DEV='blue0 net0''
 Invalid line 'Line_without_a_equal_sign_is_also_invalid'
-- 
2.39.5