fix(user/bkotslu):Add regex checks on block nums and hashes

diff --git a/user/bkotslu b/user/bkotslu
index cb372b58982bfe5d011494cb4e9823bc8dd99375..f7bf9ccdde04be40ae66f044a5e1d059a6383a1f 100755 (executable)
--- a/user/bkotslu
+++ b/user/bkotslu
@@ -1,7 +1,7 @@
 #!/bin/bash
 # Desc: Utility for backing up and retrieving ots files
 # Usage: bkotslu -I [dir]
-# Version: 0.1.0
+# Version: 0.1.3
 # Depends: OpenTimestamps 0.7.0 (see https://opentimestamps.org )
 #          GNU Coreutils 8.32
 # NOTE: This script does not verify OTS files; it assumes the contents of OTS files fed to it are valid.
@@ -213,18 +213,19 @@ get_ots_filehash() {
     # Output: stdout  sha256 file hash (lowercase)
     local output;
     vbm "DEBUG:Starting get_ots_filehash() on:$1";
-    
+
+    re='[0-9a-f]{64}';
     if output="$( "$(which ots)" info "$1" | \
             grep -E "^File sha256 hash: " | \
             head -n1 | \
             sed -E -e 's/(^File sha256 hash: )([0-9a-f]+$)/\2/g'; )" && \
-            [[ -n "$output" ]]; then
+            [[ -n "$output" ]] && \
+            [[ "$output" =~ $re ]]; then
         vbm "STATUS:Read file digest (${output}) via ots from:$1";
         printf "%s" "$output";
         return 0;
     else
-        yell "ERROR:Encountered problem getting file hash via ots from:$1";
-        return 1;
+        die "ERROR:Encountered problem getting file hash via ots from:$1";
     fi;
 }; # Gets hash of file from ots file
 get_ots_oldestblock() {
@@ -238,18 +239,19 @@ get_ots_oldestblock() {
     #          BK-2020-03: yell()
     local output;
     vbm "DEBUG:Starting get_ots_oldestblock() on:$1";
-    
+
+    re='[0-9]+';
     if output="$( "$(which ots)" info "$1" | \
             grep -E "verify BitcoinBlockHeaderAttestation\([0-9]+\)" | \
             sort | head -n1 | \
             sed -E -e 's/(^    verify BitcoinBlockHeaderAttestation)\(([0-9]+)(\))/\2/g'; )" && \
-            [[ -n "$output" ]]; then
+            [[ -n "$output" ]] && \
+            [[ "$output" =~ $re ]]; then
         vbm "STATUS:Retrieved Bitcoin block (${output}) via ots from:$1";
         printf "%s" "$output";
         return 0;
     else
-        yell "ERROR:Encountered problem getting Bitcoin block number via ots from:$1";
-        return 1;
+        die "ERROR:Encountered problem getting Bitcoin block number via ots from:$1";
     fi;
 }; # Gets oldest Bitcoin block from ots file
 store_ots_file() {
@@ -287,6 +289,10 @@ store_ots_file() {
     if ! { blk_provid="$block"; blk_stored="$(get_ots_oldestblock "$pout"; )"; }; then
         yell "ERROR:Could not read block numbers from OTS files: $(declare -p fhash block pout )";
     fi;
+    re='[0-9]+';
+    if [[ ! "$blk_stored" =~ $re ]] || [[ ! "$blk_provid" =~ $re ]]; then
+        die "FATAL:Invalid block number(s):$(declare -p blk_stored blk_provid)";
+    fi;
     
     # Copy provided OTS if matching OTS found stored but provided is older
     if [[ "$blk_provid" -lt "$blk_stored" ]]; then
@@ -317,13 +323,16 @@ get_oldest_stored_ots_path() {
     digest="$1";
     mapfile -t otsStorePaths < <(find "$pathOtsStore" -type f -name "${digest}*.otsu"; );
     if [[ "${#otsStorePaths[@]}" -le 0 ]]; then
-        yell "ERROR:No OTS file in OTS storage dir found. $(declare -p pathOtsStore digest otsStorePaths)";
+        yell "NOTICE:No OTS file for digest ${digest} found in ${pathOtsStore}.";
         return 1;
     fi;
     i_oldest=0;
+    re='[0-9]+';
     blockNumOldest="$( get_block_num_from_stored_ots_path "${otsStorePaths[0]}" )";
+    if ! [[ "$blockNumOldest" =~ $re ]]; then die "FATAL:Invalid block number:${blockNumOldest}"; fi;
     for ((i=0; i<"${#otsStorePaths[@]}"; i++ )); do
         blockNum="$( get_block_num_from_stored_ots_path "${otsStorePaths[$i]}" )";
+        if ! [[ "$blockNum" =~ $re ]]; then die "FATAL:Invalid block number:${blockNum}"; fi;
         if [[ $blockNum -lt $blockNumOldest ]]; then
             blockNumOldest=$blockNum;
             i_oldest=$i;
@@ -396,8 +405,12 @@ store_and_lookup() {
     ## Check for OTS file accompanying provided file
     if [[ -f "${pathFileIn}.ots" ]]; then
         vbm "STATUS:An OTS file is next to provided file ${pathFileIn}.";
-        blk_provid="$(get_ots_oldestblock "${pathFileIn}.ots"; )";
+        blk_provid="$(must get_ots_oldestblock "${pathFileIn}.ots"; )";
         vbm "STATUS:The provided file's OTS file has block number ${blk_provid}";
+        re='[0-9]+';
+        if [[ ! "$blk_stored" =~ $re ]] || [[ ! "$blk_provid" =~ $re ]]; then
+            die "FATAL:Invalid block number(s):$(declare -p blk_stored blk_provid)";
+        fi;
         if [[ "$blk_stored" -lt "$blk_provid" ]]; then
             vbm "STATUS:An older timestamp in OTS store found. Replacing ${pathFileIn}.ots (block ${blk_provid}) with ${path_stored_ots} (block ${blk_stored}).";
             if [[ ! -f "${pathFileIn}.ots.baku" ]]; then