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  1. # -*-shell-script-*-
  2. # This should be sourced by bash (though we welcome changes to make it POSIX sh compliant)
  3. # Monkeysphere authentication setup subcommand
  4. #
  5. # The monkeysphere scripts are written by:
  6. # Jameson Rollins <jrollins@finestructure.net>
  7. # Jamie McClelland <jm@mayfirst.org>
  8. # Daniel Kahn Gillmor <dkg@fifthhorseman.net>
  9. #
  10. # They are Copyright 2009, and are all released under the GPL,
  11. # version 3 or later.
  12. setup() {
  13. # make all needed directories
  14. log debug "checking authentication directory structure..."
  15. mkdir -p "${MADATADIR}"
  16. chmod 0750 "${MADATADIR}"
  17. chgrp "$MONKEYSPHERE_GROUP" "${MADATADIR}"
  18. mkdir -p "${MATMPDIR}"
  19. chmod 0750 "${MATMPDIR}"
  20. chgrp "$MONKEYSPHERE_GROUP" "${MATMPDIR}"
  21. mkdir -p "${GNUPGHOME_CORE}"
  22. chmod 0700 "${GNUPGHOME_CORE}"
  23. mkdir -p "${GNUPGHOME_SPHERE}"
  24. chmod 0700 "${GNUPGHOME_SPHERE}"
  25. mkdir -p "${SYSDATADIR}"/authorized_keys
  26. # deliberately replace the config files via truncation
  27. # FIXME: should we be dumping to tmp files and then moving atomically?
  28. log debug "writing core gpg.conf..."
  29. cat >"${GNUPGHOME_CORE}"/gpg.conf <<EOF
  30. # Monkeysphere trust core GnuPG configuration
  31. # This file is maintained by the Monkeysphere software.
  32. # Edits will be overwritten.
  33. no-greeting
  34. EOF
  35. log debug "writing sphere gpg.conf..."
  36. cat >"${GNUPGHOME_SPHERE}"/gpg.conf <<EOF
  37. # Monkeysphere trust sphere GnuPG configuration
  38. # This file is maintained by the Monkeysphere software.
  39. # Edits will be overwritten.
  40. no-greeting
  41. list-options show-uid-validity
  42. EOF
  43. # make sure the monkeysphere user owns everything in the sphere
  44. # gnupghome
  45. log debug "fixing sphere gnupg home ownership..."
  46. chown "$MONKEYSPHERE_USER:$MONKEYSPHERE_GROUP" "${GNUPGHOME_SPHERE}" "${GNUPGHOME_SPHERE}"/gpg.conf
  47. # get fingerprint of core key. this should be empty on unconfigured systems.
  48. local CORE_FPR=$(core_fingerprint)
  49. log debug "core fingerprint: $CORE_FPR"
  50. if [ -z "$CORE_FPR" ] ; then
  51. log info "setting up Monkeysphere authentication trust core..."
  52. local CORE_UID=$(printf "Monkeysphere authentication trust core UID (random string: %s)" $(dd if=/dev/urandom bs=21 count=1 | perl -MMIME::Base64 -ne 'print encode_base64($_)'))
  53. printf "generating monkeysphere authentication trust core key:\nsize: %d bits\nuid: '%s'\n" "$CORE_KEYLENGTH" "$CORE_UID" | log debug
  54. PEM2OPENPGP_USAGE_FLAGS=certify \
  55. PEM2OPENPGP_NEWKEY=$CORE_KEYLENGTH pem2openpgp "$CORE_UID" \
  56. | gpg_core --import \
  57. || failure "Could not import new key for Monkeysphere authentication trust core"
  58. # get fingerprint of core key. should definitely not be empty at this point
  59. CORE_FPR=$(core_fingerprint)
  60. log debug "core fingerprint: $CORE_FPR"
  61. if [ -z "$CORE_FPR" ] ; then
  62. failure "Failed to create Monkeysphere authentication trust core!"
  63. fi
  64. else
  65. log verbose "Monkeysphere authentication trust core already exists."
  66. fi
  67. # export the core key to the sphere keyring
  68. log debug "exporting core pub key to sphere keyring..."
  69. gpg_core --export | gpg_sphere "--import"
  70. # ensure that the authentication sphere checker has absolute ownertrust on the expected key.
  71. log debug "setting ultimate owner trust on core key in gpg_sphere..."
  72. printf "%s:6:\n" "$CORE_FPR" | gpg_sphere "--import-ownertrust" 2>&1 | log verbose
  73. gpg_sphere "--export-ownertrust" 2>&1 | log debug
  74. # check the owner trust
  75. log debug "checking gpg_sphere owner trust set properly..."
  76. local ORIG_TRUST
  77. if ORIG_TRUST=$(gpg_sphere "--export-ownertrust" | grep '^[^#]') ; then
  78. if [ "${CORE_FPR}:6:" != "$ORIG_TRUST" ] ; then
  79. failure "Monkeysphere authentication trust sphere should explicitly trust the core. It does not have proper ownertrust settings."
  80. fi
  81. else
  82. failure "Could not get monkeysphere-authentication trust guidelines."
  83. # FIXME: what does this mean? should we suggest how to fix?
  84. fi
  85. # ensure that we're using the extended trust model (1), and that
  86. # our preferences are reasonable (i.e. 3 marginal OR 1 fully
  87. # trusted certifications are sufficient to grant full validity.
  88. log debug "checking trust model for authentication ..."
  89. local TRUST_MODEL=$(gpg_sphere "--with-colons --fixed-list-mode --list-keys" 2>/dev/null \
  90. | head -n1 | grep "^tru:" | cut -d: -f3,6,7)
  91. log debug "sphere trust model: $TRUST_MODEL"
  92. if [ "$TRUST_MODEL" != '1:3:1' ] ; then
  93. failure "monkeysphere-authentication does not have the expected trust model settings."
  94. # FIXME: what does this mean? should we suggest how to fix?
  95. fi
  96. }