contrib/verify-commits/verify-commits.sh

   1 #!/bin/sh
   2 # Copyright (c) 2014-2016 The Bitcoin Core developers
   3 # Distributed under the MIT software license, see the accompanying
   4 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 DIR=$(dirname "$0")
   7 [ "/${DIR#/}" != "$DIR" ] && DIR=$(dirname "$(pwd)/$0")
   8
   9 echo "Using verify-commits data from ${DIR}"
  10
  11 VERIFIED_ROOT=$(cat "${DIR}/trusted-git-root")
  12 VERIFIED_SHA512_ROOT=$(cat "${DIR}/trusted-sha512-root-commit")
  13 REVSIG_ALLOWED=$(cat "${DIR}/allow-revsig-commits")
  14
  15 HAVE_GNU_SHA512=1
  16 [ ! -x "$(which sha512sum)" ] && HAVE_GNU_SHA512=0
  17
  18 if [ x"$1" = "x" ]; then
  19         CURRENT_COMMIT="HEAD"
  20 else
  21         CURRENT_COMMIT="$1"
  22 fi
  23
  24 if [ "${CURRENT_COMMIT#* }" != "$CURRENT_COMMIT" ]; then
  25         echo "Commit must not contain spaces?" > /dev/stderr
  26         exit 1
  27 fi
  28
  29 VERIFY_TREE=0
  30 if [ x"$2" = "x--tree-checks" ]; then
  31         VERIFY_TREE=1
  32 fi
  33
  34 NO_SHA1=1
  35 PREV_COMMIT=""
  36
  37 while true; do
  38         if [ "$CURRENT_COMMIT" = $VERIFIED_ROOT ]; then
  39                 echo "There is a valid path from "$CURRENT_COMMIT" to $VERIFIED_ROOT where all commits are signed!"
  40                 exit 0
  41         fi
  42
  43         if [ "$CURRENT_COMMIT" = $VERIFIED_SHA512_ROOT ]; then
  44                 if [ "$VERIFY_TREE" = "1" ]; then
  45                         echo "All Tree-SHA512s matched up to $VERIFIED_SHA512_ROOT" > /dev/stderr
  46                 fi
  47                 VERIFY_TREE=0
  48                 NO_SHA1=0
  49         fi
  50
  51         if [ "$NO_SHA1" = "1" ]; then
  52                 export BITCOIN_VERIFY_COMMITS_ALLOW_SHA1=0
  53         else
  54                 export BITCOIN_VERIFY_COMMITS_ALLOW_SHA1=1
  55         fi
  56
  57         if [ "${REVSIG_ALLOWED#*$CURRENT_COMMIT}" != "$REVSIG_ALLOWED" ]; then
  58                 export BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG=1
  59         else
  60                 export BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG=0
  61         fi
  62
  63         if ! git -c "gpg.program=${DIR}/gpg.sh" verify-commit "$CURRENT_COMMIT" > /dev/null; then
  64                 if [ "$PREV_COMMIT" != "" ]; then
  65                         echo "No parent of $PREV_COMMIT was signed with a trusted key!" > /dev/stderr
  66                         echo "Parents are:" > /dev/stderr
  67                         PARENTS=$(git show -s --format=format:%P $PREV_COMMIT)
  68                         for PARENT in $PARENTS; do
  69                                 git show -s $PARENT > /dev/stderr
  70                         done
  71                 else
  72                         echo "$CURRENT_COMMIT was not signed with a trusted key!" > /dev/stderr
  73                 fi
  74                 exit 1
  75         fi
  76
  77         # We always verify the top of the tree
  78         if [ "$VERIFY_TREE" = 1 -o "$PREV_COMMIT" = "" ]; then
  79                 IFS_CACHE="$IFS"
  80                 IFS='
  81 '
  82                 for LINE in $(git ls-tree --full-tree -r "$CURRENT_COMMIT"); do
  83                         case "$LINE" in
  84                                 "12"*)
  85                                         echo "Repo contains symlinks" > /dev/stderr
  86                                         IFS="$IFS_CACHE"
  87                                         exit 1
  88                                         ;;
  89                         esac
  90                 done
  91                 IFS="$IFS_CACHE"
  92
  93                 FILE_HASHES=""
  94                 for FILE in $(git ls-tree --full-tree -r --name-only "$CURRENT_COMMIT" | LC_ALL=C sort); do
  95                         if [ "$HAVE_GNU_SHA512" = 1 ]; then
  96                                 HASH=$(git cat-file blob "$CURRENT_COMMIT":"$FILE" | sha512sum | { read FIRST OTHER; echo $FIRST; } )
  97                         else
  98                                 HASH=$(git cat-file blob "$CURRENT_COMMIT":"$FILE" | shasum -a 512 | { read FIRST OTHER; echo $FIRST; } )
  99                         fi
 100                         [ "$FILE_HASHES" != "" ] && FILE_HASHES="$FILE_HASHES"'
 101 '
 102                         FILE_HASHES="$FILE_HASHES$HASH  $FILE"
 103                 done
 104
 105                 if [ "$HAVE_GNU_SHA512" = 1 ]; then
 106                         TREE_HASH="$(echo "$FILE_HASHES" | sha512sum)"
 107                 else
 108                         TREE_HASH="$(echo "$FILE_HASHES" | shasum -a 512)"
 109                 fi
 110                 HASH_MATCHES=0
 111                 MSG="$(git show -s --format=format:%B "$CURRENT_COMMIT" | tail -n1)"
 112
 113                 case "$MSG  -" in
 114                         "Tree-SHA512: $TREE_HASH")
 115                                 HASH_MATCHES=1;;
 116                 esac
 117
 118                 if [ "$HASH_MATCHES" = "0" ]; then
 119                         echo "Tree-SHA512 did not match for commit $CURRENT_COMMIT" > /dev/stderr
 120                         exit 1
 121                 fi
 122         fi
 123
 124         PARENTS=$(git show -s --format=format:%P "$CURRENT_COMMIT")
 125         for PARENT in $PARENTS; do
 126                 PREV_COMMIT="$CURRENT_COMMIT"
 127                 CURRENT_COMMIT="$PARENT"
 128                 break
 129         done
 130 done