bin/git-daemon-verify

   1 #!/bin/sh
   2 #
   3 # Abort any fetch early if the fetch is invalid or times out.
   4 # This avoids unnecessary traffic and unpacked object pollution.
   5 #
   6 # This script is called for fetch, archive and push.
   7 # Push requests are outright rejected and so are paths starting with ~.
   8
   9 set -e
  10
  11 . @basedir@/shlib.sh
  12
  13 unset GIT_USER_AGENT
  14 unset GIT_HTTP_USER_AGENT
  15 if [ -n "$defined_cfg_git_server_ua" ]; then
  16         GIT_USER_AGENT="$cfg_git_server_ua"
  17         export GIT_USER_AGENT
  18         GIT_HTTP_USER_AGENT="$cfg_git_server_ua"
  19         export GIT_HTTP_USER_AGENT
  20 fi
  21
  22 [ -z "$GIT_DAEMON_BIN" ] || cfg_git_daemon_bin="$GIT_DAEMON_BIN"
  23 [ -n "$cfg_git_daemon_bin" ] || \
  24         cfg_git_daemon_bin="$var_git_exec_path/git-daemon"
  25
  26 errormsg()
  27 {
  28         _l="$*"
  29         printf '%04xERR %s' $(( 8 + ${#_l} )) "$_l"
  30 }
  31
  32 invalbaderr()
  33 {
  34         errormsg "invalid or incomplete request"
  35 }
  36
  37 invalerr()
  38 {
  39         errormsg "invalid or unsupported request"
  40 }
  41
  42 denied()
  43 {
  44         errormsg "access denied or no such repository"
  45 }
  46
  47 internalerr()
  48 {
  49         echo "git-daemon-verify: $*" >&2
  50         errormsg "internal server error"
  51 }
  52
  53 # A quick sanity check
  54 if [ -z "$cfg_git_daemon_bin" ] || ! [ -x "$cfg_git_daemon_bin" ]; then
  55         internalerr "bad cfg_git_daemon_bin: $cfg_git_daemon_bin"
  56         exit 1
  57 fi
  58 case "$cfg_reporoot" in /?*) :;; *)
  59         internalerr "bad reporoot: $cfg_reporoot"
  60         exit 1
  61 esac
  62
  63 PATH="$(dirname "$cfg_git_daemon_bin"):$PATH"
  64 export PATH
  65
  66 if ! request="$("$cfg_basedir/bin/peek_packet")"; then
  67         invalbaderr
  68         exit 1
  69 fi
  70
  71 # The request should look like one of the following
  72 #
  73 #   git-upload-pack /dir
  74 #   git-upload-pack ~name/dir
  75 #   git-upload-archive /dir
  76 #   git-upload-archive ~name/dir
  77 #   git-receive-pack /dir
  78 #   git-receive-pack ~name/dir
  79 #
  80 # Where the '~' forms are relative to a user's home directory.
  81 # A trailing '/' is optional as well as a final '.git'.
  82 # git-receive-pack and paths starting with '~' are rejected outright.
  83
  84 type=
  85 dir=
  86 case "$request" in
  87         "git-upload-pack "*)    type='upload-pack';    dir="${request#git-upload-pack }";;
  88         "git-upload-archive "*) type='upload-archive'; dir="${request#git-upload-archive }";;
  89         "git-receive-pack "*)   type='receive-pack';   dir="${request#git-receive-pack }";;
  90         *)
  91                 invalerr
  92                 exit 1
  93 esac
  94 if [ "$type" = 'receive-pack' ]; then
  95         invalerr
  96         exit 1
  97 fi
  98 case "$dir" in /*) :;; *)
  99         invalerr
 100         exit 1
 101 esac
 102
 103 # remove extraneous '/' chars
 104 proj="${dir#/}"
 105 proj="${proj%/}"
 106 # add a missing .git
 107 case "$proj" in
 108         *.git) :;;
 109         *)
 110                 proj="$proj.git"
 111 esac
 112
 113 # Reject any project names that start with _ or contain ..
 114 case "$proj" in _*|*..*)
 115         denied
 116         exit 1
 117 esac
 118
 119 reporoot="$cfg_reporoot"
 120 dir="$reporoot/$proj"
 121
 122 # Valid project names never end in .git (we add that automagically), so a valid
 123 # fork can never have .git at the end of any path component except the last.
 124 # We check this to avoid a situation where a certain collection of pushed refs
 125 # could be mistaken for a GIT_DIR.  Git would ultimately complain, but some
 126 # undesirable things could happen along the way.
 127
 128 # Remove the leading $reporoot and trailing .git to get a test string
 129 testpath="${dir#$reporoot/}"
 130 testpath="${testpath%.git}"
 131 case "$testpath/" in *.[Gg][Ii][Tt]/*|_*)
 132         denied
 133         exit 1
 134 esac
 135
 136 if ! [ -d "$dir" ] || ! [ -f "$dir/HEAD" ] || ! [ -d "$dir/objects" ]; then
 137         denied
 138         exit 1
 139 fi
 140
 141 [ -z "$var_upload_window" ] || [ "$type" != "upload-pack" ] || \
 142         git_add_config "pack.window=$var_upload_window"
 143
 144 exec "$cfg_git_daemon_bin" --inetd --verbose --export-all --enable=upload-archive --base-path="$cfg_reporoot"
 145 internalerr "exec failed: $cfg_git_daemon_bin"
 146 exit 1