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Protect user db with flock

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This commit is contained in:
Erik Wramner 2019-08-01 19:39:25 +02:00
parent d6861881ab
commit 81e9c7dcff
5 changed files with 68 additions and 38 deletions
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25
target/bin/addmailuser
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@ -22,13 +22,20 @@ escape() {
[ -z "$USER" ] && { usage; errex "no username specified"; }
expr index "$USER" "@" >/dev/null || { usage; errex "username must include the domain"; }
grep -qi "^$(escape "$USER")|" $DATABASE 2>/dev/null &&
errex "User \"$USER\" already exists"
# Protect config file with lock to avoid race conditions
touch $DATABASE
(
flock -e 200
if [ -z "$PASSWD" ]; then
read -s -p "Enter Password: " PASSWD
echo
[ -z "$PASSWD" ] && errex "Password must not be empty"
fi
HASH="$(doveadm pw -s SHA512-CRYPT -u "$USER" -p "$PASSWD")"
echo "$USER|$HASH" >> $DATABASE
grep -qi "^$(escape "$USER")|" $DATABASE 2>/dev/null &&
errex "User \"$USER\" already exists"
if [ -z "$PASSWD" ]; then
read -s -p "Enter Password: " PASSWD
echo
[ -z "$PASSWD" ] && errex "Password must not be empty"
fi
HASH="$(doveadm pw -s SHA512-CRYPT -u "$USER" -p "$PASSWD")"
echo "$USER|$HASH" >> $DATABASE
) 200<$DATABASE