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