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add some pretty lame security checks to stfu

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Connor Olding 2021-08-02 13:49:38 -07:00
parent 7ae8c5681d
commit d44da54b36
1 changed files with 26 additions and 1 deletions
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27
sh/stfu
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@ -43,7 +43,30 @@ stfu() { ### @-
### ``` ### ```
[ $# -gt 0 ] || { printf "%s\n" "$0: too few arguments" >&2; return 1; } [ $# -gt 0 ] || { printf "%s\n" "$0: too few arguments" >&2; return 1; }
local temp="${TMP:-/tmp}/stfu" local dirty=0 temp="$STFU_DIR"
if [ -z "$temp" ]; then
temp="$(mktemp -dt stfu.XXXXXXXXXX)"
[ $? -eq 0 ] || { printf "%s\n" "$0: failed create temporary directory" >&2; return 1; }
dirty=1
fi
# NOTE: this stat command will not work on BSD-likes,
# but it will work with GNU coreutils and busybox.
local perms="$(stat -c '%a' "$temp")"
local realtemp="$(readlink -f "$temp")"
[ -z "$MSYSTEM" ] || perms=700 # MSYS2 is insecure, oh well.
if [ -d "$temp" ] && [ "$realtemp" = "$temp" ] && [ "$perms" = 700 ]; then
if [ $dirty -ne 0 ]; then
export STFU_DIR="$temp"
fi
else
if [ -n "$STFU_DIR" ]; then
printf "%s\n" "$0: invalid temporary directory, please unset STFU_DIR" >&2;
else
printf "%s\n" "$0: something went horribly wrong, maybe you can tell?" "$perms" "$realtemp"
fi
return 1
fi
local time="$(date -u '+%s')" local time="$(date -u '+%s')"
[ $? -eq 0 ] || { printf "%s\n" "$0: failed to get current time" >&2; return 1; } [ $? -eq 0 ] || { printf "%s\n" "$0: failed to get current time" >&2; return 1; }
@ -54,6 +77,8 @@ stfu() { ### @-
local out="$temp/out_$time" local out="$temp/out_$time"
local err="$temp/err_$time" local err="$temp/err_$time"
touch "$out" && touch "$err" || { printf "%s\n" "$0: failed to create temp files" >&2; return 1; }
#local out="$(mktemp -t -p "$temp" out_XXXXXX)" #local out="$(mktemp -t -p "$temp" out_XXXXXX)"
#[ $? -eq 0 ] || { printf "%s\n" "$0: failed to create temp file" >&2; return 1; } #[ $? -eq 0 ] || { printf "%s\n" "$0: failed to create temp file" >&2; return 1; }
#local err="$(mktemp -t -p "$temp" err_XXXXXX)" #local err="$(mktemp -t -p "$temp" err_XXXXXX)"