488 lines
19 KiB
Scheme
488 lines
19 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2019, 2020 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2020 Tobias Geerinckx-Rice <me@tobias.gr>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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;;;
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;;; Authenticate a range of commits.
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;;;
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(use-modules (git)
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(guix git)
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(guix openpgp)
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(guix base16)
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((guix utils)
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#:select (cache-directory with-atomic-file-output))
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((guix build utils) #:select (mkdir-p))
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(guix i18n)
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(guix progress)
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(srfi srfi-1)
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(srfi srfi-11)
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(srfi srfi-26)
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(srfi srfi-34)
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(srfi srfi-35)
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(rnrs bytevectors)
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(rnrs io ports)
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(ice-9 match)
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(ice-9 format)
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(ice-9 pretty-print))
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(define %committers
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;; List of committers. These are the user names found on
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;; <https://savannah.gnu.org/project/memberlist.php?group=guix> along with
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;; the fingerprint of the signing (sub)key.
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;;
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;; TODO: Replace this statically-defined list by an in-repo list.
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'(("andreas"
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"AD17 A21E F8AE D8F1 CC02 DBD9 F7D5 C9BF 765C 61E3")
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("ajgrf"
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"2A39 3FFF 68F4 EF7A 3D29 12AF 6F51 20A0 22FB B2D5")
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("alexvong1995"
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"306F CB8F 2C01 C25D 29D3 0556 61EF 502E F602 52F2")
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("alezost"
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"4FB9 9F49 2B12 A365 7997 E664 8246 0C08 2A0E E98F")
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("ambrevar"
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"50F3 3E2E 5B0C 3D90 0424 ABE8 9BDC F497 A4BB CC7F")
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("apteryx"
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"27D5 86A4 F890 0854 329F F09F 1260 E464 82E6 3562")
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("arunisaac"
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"7F73 0343 F2F0 9F3C 77BF 79D3 2E25 EE8B 6180 2BB3")
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("atheia"
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;; primary: "3B12 9196 AE30 0C3C 0E90 A26F A715 5567 3271 9948"
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"9A2B 401E D001 0650 1584 BAAC 8BC4 F447 6E8A 8E00")
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("bandali"
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;; primary: "BE62 7373 8E61 6D6D 1B3A 08E8 A21A 0202 4881 6103"
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"39B3 3C8D 9448 0D2D DCC2 A498 8B44 A0CD C7B9 56F2")
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("bavier"
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;; primary: "34FF 38BC D151 25A6 E340 A0B5 3453 2F9F AFCA 8B8E"
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"A0C5 E352 2EF8 EF5C 64CD B7F0 FD73 CAC7 19D3 2566")
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("beffa"
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"3774 8024 880F D3FF DCA2 C9AB 5893 6E0E 2F1B 5A4C")
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("benwoodcroft"
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"BCF8 F737 2CED 080A 67EB 592D 2A6A D9F4 AAC2 0DF6")
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("biscuolo"
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"45CC 63B8 5258 C9D5 5F34 B239 D37D 0EA7 CECC 3912")
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("boskovits"
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"7988 3B9F 7D6A 4DBF 3719 0367 2506 A96C CF63 0B21")
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("brettgilio"
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"DFC0 C7F7 9EE6 0CA7 AE55 5E19 6722 43C4 A03F 0EEE")
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("carl"
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;; primary: "0401 7A2A 6D9A 0CCD C81D 8EC2 96AB 007F 1A7E D999"
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"09CD D25B 5244 A376 78F6 EEA8 0CC5 2153 1979 91A5")
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("cbaines"
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"3E89 EEE7 458E 720D 9754 E0B2 5E28 A33B 0B84 F577")
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("civodul"
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"3CE4 6455 8A84 FDC6 9DB4 0CFB 090B 1199 3D9A EBB5")
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("cwebber"
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"510A 8628 E2A7 7678 8F8C 709C 4BC0 2592 5FF8 F4D3")
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("dannym"
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;; primary: "295A F991 6F46 F8A1 34B0 29DA 8086 3842 F0FE D83B"
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"76CE C6B1 7274 B465 C02D B3D9 E71A 3554 2C30 BAA5")
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("davexunit"
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"B3C0 DB4D AD73 BA5D 285E 19AE 5143 0234 CEFD 87C3")
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("davexunit (2nd)" ;FIXME: to be confirmed!
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"8CCB A7F5 52B9 CBEA E1FB 2915 8328 C747 0FF1 D807")
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("daviwil"
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"53C4 1E6E 41AA FE55 335A CA5E 446A 2ED4 D940 BF14")
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("dvc"
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"6909 6DFD D702 8BED ACC5 884B C5E0 51C7 9C0B ECDB")
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("dvc (old)"
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"5F43 B681 0437 2F4B A898 A64B 33B9 E9FD E28D 2C23")
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("efraim"
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"A28B F40C 3E55 1372 662D 14F7 41AA E7DC CA3D 8351")
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("efraim (old)"
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"9157 41FE B22F A4E3 3B6E 8F8D F4C1 D391 7EAC EE93")
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("glv"
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;; primary: "2453 02B1 BAB1 F867 FDCA 96BC 8F3F 861F 82EB 7A9A"
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"CBC5 9C66 EC27 B971 7940 6B3E 6BE8 208A DF21 FE3F")
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("hoebjo"
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"2219 43F4 9E9F 276F 9499 3382 BF28 6CB6 593E 5FFD")
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("htgoebel"
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"B943 509D 633E 80DD 27FC 4EED 634A 8DFF D3F6 31DF")
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("ipetkov"
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"7440 26BA 7CA3 C668 E940 1D53 0B43 1E98 3705 6942")
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("iyzsong"
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;; primary: "66A5 6D9C 9A98 BE7F 719A B401 2652 5665 AE72 7D37"
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"0325 78A6 8298 94E7 2AA2 66F5 D415 BF25 3B51 5976")
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;; https://lists.gnu.org/archive/html/guix-devel/2018-04/msg00229.html
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("janneke (old)"
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"DB34 CB51 D25C 9408 156F CDD6 A12F 8797 8D70 1B99")
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("janneke"
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"1A85 8392 E331 EAFD B8C2 7FFB F3C1 A0D9 C1D6 5273")
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("jlicht"
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;; primary: "1BA4 08C5 8BF2 0EA7 3179 635A 865D C0A3 DED9 B5D0"
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"E31D 9DDE EBA5 4A14 8A20 4550 DA45 97F9 47B4 1025")
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("jmd"
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"8797 A26D 0854 2EAB 0285 A290 8A67 719C 2DE8 27B3")
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("kkebreau"
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"83B6 703A DCCA 3B69 4BCE 2DA6 E6A5 EE3C 1946 7A0D")
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("leungbk"
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"45E5 75FA 53EA 8BD6 1BCE 0B4E 3ADC 75F0 13D6 78F9")
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("lfam"
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;; primary: "4F71 6F9A 8FA2 C80E F1B5 E1BA 5E35 F231 DE1A C5E0"
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"B051 5948 F1E7 D3C1 B980 38A0 2646 FA30 BACA 7F08")
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("lsl88"
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"2AE3 1395 932B E642 FC0E D99C 9BED 6EDA 32E5 B0BC")
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("marusich"
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"CBF5 9755 CBE7 E7EF EF18 3FB1 DD40 9A15 D822 469D")
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("mbakke"
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"BBB0 2DDF 2CEA F6A8 0D1D E643 A2A0 6DF2 A33A 54FA")
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("mhw"
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"D919 0965 CE03 199E AF28 B3BE 7CEF 2984 7562 C516")
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("mothacehe"
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"4008 6A7E 0252 9B60 31FB 8607 8354 7635 3176 9CA6")
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("mthl"
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"F2A3 8D7E EB2B 6640 5761 070D 0ADE E100 9460 4D37")
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("nckx"
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;; primary: "F5BC 5534 C36F 0087 B39D 36EF 1C9D C4FE B9DB 7C4B"
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"F5DA 2032 4B87 3D0B 7A38 7672 0DB0 FF88 4F55 6D79")
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("nckx (revoked; not compromised)"
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;; primary: "F5BC 5534 C36F 0087 B39D 36EF 1C9D C4FE B9DB 7C4B"
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"7E8F AED0 0944 78EF 72E6 4D16 D889 B0F0 18C5 493C")
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("niedzejkob"
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"E576 BFB2 CF6E B13D F571 33B9 E315 A758 4613 1564")
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("ngz"
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"ED0E F1C8 E126 BA83 1B48 5FE9 DA00 B4F0 48E9 2F2D")
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("pelzflorian"
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"CEF4 CB91 4856 BA38 0A20 A7E2 3008 88CB 39C6 3817")
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("pgarlick"
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;; primary: "B68B DF22 73F9 DA0E 63C1 8A32 515B F416 9242 D600"
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"C699 ED09 E51B CE89 FD1D A078 AAC7 E891 896B 568A")
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("phant0mas"
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"3A86 380E 58A8 B942 8D39 60E1 327C 1EF3 8DF5 4C32")
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("reepca"
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"74D6 A930 F44B 9B84 9EA5 5606 C166 AA49 5F7F 189C")
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("rekado"
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"BCA6 89B6 3655 3801 C3C6 2150 197A 5888 235F ACAC")
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("rhelling"
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"0154 E1B9 1CC9 D9EF 7764 8DE7 F3A7 27DB 44FC CA36")
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("roelj (old)"
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"17CB 2812 EB63 3DFF 2C7F 0452 C3EC 1DCA 8430 72E1")
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("roelj"
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;; From commit cc51c03ff867d4633505354819c6d88af88bf919 (March 2020).
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;; See <https://lists.gnu.org/archive/html/guix-devel/2020-03/msg00070.html>.
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"F556 FD94 FB8F 8B87 79E3 6832 CBD0 CD51 38C1 9AFC")
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("roptat (old)"
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"B5FA E628 5B41 3728 B2A0 FAED 4311 1F45 2008 6A0C")
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("roptat"
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;; From commit 2cbede5935eb6a40173bbdf30a9ad22bf7574c22 (Jan. 2020). See
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;; <https://lists.gnu.org/archive/html/guix-devel/2020-01/msg00499.html>.
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"1EFB 0909 1F17 D28C CBF9 B13A 53D4 57B2 D636 EE82")
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("samplet"
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;; primary: "D6B0 C593 DA8C 5EDC A44C 7A58 C336 91F7 1188 B004"
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"A02C 2D82 0EF4 B25B A6B5 1D90 2AC6 A5EC 1C35 7C59")
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("sleep_walker"
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"77DD AD2D 97F5 31BB C0F3 C7FD DFB5 EB09 AA62 5423")
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("snape"
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"F494 72F4 7A59 00D5 C235 F212 89F9 6D48 08F3 59C7")
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("steap"
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"4E26 CCE9 578E 0828 9855 BDD4 1C79 95D2 D5A3 8336")
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("taylanub"
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"9ADE 9ECF 2B19 C180 9C99 5CEA A1F4 CFCC 5283 6BAC")
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;; https://lists.gnu.org/archive/html/guix-devel/2017-03/msg00826.html
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("thomasd"
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;; primary: "1DD1 681F E285 E07F 11DC 0C59 2E15 A6BC D77D 54FD"
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"3D2C DA58 819C 08C2 A649 D43D 5C3B 064C 724A 5726")
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("thomasd (old)"
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"A5C5 92EA 606E 7106 A6A3 BC08 98B2 1575 91E1 2B08")
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("toothbrush"
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"D712 1D73 A40A 7264 9E43 ED7D F284 6B1A 0D32 C442")
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("vagrantc"
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"6580 7361 3BFC C5C7 E2E4 5D45 DC51 8FC8 7F97 16AA")
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("wigust"
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;; primary: "C955 CC5D C048 7FB1 7966 40A9 199A F6A3 67E9 4ABB"
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"7238 7123 8EAC EB63 4548 5857 167F 8EA5 001A FA9C")
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("wingo"
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"FF47 8FB2 64DE 32EC 2967 25A3 DDC0 F535 8812 F8F2")))
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(define %authorized-signing-keys
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;; Fingerprint of authorized signing keys.
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(map (match-lambda
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((name fingerprint)
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(base16-string->bytevector
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(string-downcase (string-filter char-set:graphic fingerprint)))))
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%committers))
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(define %commits-with-bad-signature
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;; Commits with a known-bad signature.
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'("6a34f4ccc8a5d4a48e25ad3c9c512f8634928b91")) ;2016-12-29
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(define %unsigned-commits
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;; Commits lacking a signature.
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'())
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(define (commit-signing-key repo commit-id keyring)
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"Return the OpenPGP key that signed COMMIT-ID (an OID). Raise an exception
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if the commit is unsigned, has an invalid signature, or if its signing key is
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not in KEYRING."
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(let-values (((signature signed-data)
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(catch 'git-error
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(lambda ()
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(commit-extract-signature repo commit-id))
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(lambda _
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(values #f #f)))))
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(unless signature
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(raise (condition
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(&message
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(message (format #f (G_ "commit ~a lacks a signature")
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commit-id))))))
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(let ((signature (string->openpgp-packet signature)))
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(with-fluids ((%default-port-encoding "UTF-8"))
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(let-values (((status data)
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(verify-openpgp-signature signature keyring
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(open-input-string signed-data))))
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(match status
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('bad-signature
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;; There's a signature but it's invalid.
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(raise (condition
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(&message
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(message (format #f (G_ "signature verification failed \
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for commit ~a")
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(oid->string commit-id)))))))
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('missing-key
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(raise (condition
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(&message
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(message (format #f (G_ "could not authenticate \
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commit ~a: key ~a is missing")
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(oid->string commit-id)
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data))))))
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('good-signature data)))))))
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(define (read-authorizations port)
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"Read authorizations in the '.guix-authorizations' format from PORT, and
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return a list of authorized fingerprints."
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(match (read port)
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(('authorizations ('version 0)
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(((? string? fingerprints) _ ...) ...)
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_ ...)
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(map (lambda (fingerprint)
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(base16-string->bytevector
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(string-downcase (string-filter char-set:graphic fingerprint))))
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fingerprints))))
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(define* (commit-authorized-keys repository commit
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#:optional (default-authorizations '()))
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"Return the list of OpenPGP fingerprints authorized to sign COMMIT, based on
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authorizations listed in its parent commits. If one of the parent commits
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does not specify anything, fall back to DEFAULT-AUTHORIZATIONS."
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(define (commit-authorizations commit)
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(catch 'git-error
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(lambda ()
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(let* ((tree (commit-tree commit))
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(entry (tree-entry-bypath tree ".guix-authorizations"))
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(blob (blob-lookup repository (tree-entry-id entry))))
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(read-authorizations
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(open-bytevector-input-port (blob-content blob)))))
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(lambda (key error)
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(if (= (git-error-code error) GIT_ENOTFOUND)
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default-authorizations
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(throw key error)))))
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(apply lset-intersection bytevector=?
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(map commit-authorizations (commit-parents commit))))
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(define (authenticate-commit repository commit keyring)
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"Authenticate COMMIT from REPOSITORY and return the signing key fingerprint.
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Raise an error when authentication fails."
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(define id
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(commit-id commit))
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(define signing-key
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(commit-signing-key repository id keyring))
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(unless (member (openpgp-public-key-fingerprint signing-key)
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(commit-authorized-keys repository commit
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%authorized-signing-keys))
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(raise (condition
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(&message
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(message (format #f (G_ "commit ~a not signed by an authorized \
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key: ~a")
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(oid->string id)
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(openpgp-format-fingerprint
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(openpgp-public-key-fingerprint
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signing-key))))))))
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signing-key)
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(define (load-keyring-from-blob repository oid keyring)
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"Augment KEYRING with the keyring available in the blob at OID, which may or
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may not be ASCII-armored."
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(let* ((blob (blob-lookup repository oid))
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(port (open-bytevector-input-port (blob-content blob))))
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(get-openpgp-keyring (if (port-ascii-armored? port)
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(open-bytevector-input-port (read-radix-64 port))
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port)
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keyring)))
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(define (load-keyring-from-reference repository reference)
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"Load the '.key' files from the tree at REFERENCE in REPOSITORY and return
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an OpenPGP keyring."
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(let* ((reference (branch-lookup repository
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(string-append "origin/" reference)
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BRANCH-REMOTE))
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(target (reference-target reference))
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(commit (commit-lookup repository target))
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(tree (commit-tree commit)))
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(fold (lambda (name keyring)
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(if (string-suffix? ".key" name)
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(let ((entry (tree-entry-bypath tree name)))
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(load-keyring-from-blob repository
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(tree-entry-id entry)
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keyring))
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keyring))
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%empty-keyring
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(tree-list tree))))
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(define* (authenticate-commits repository commits
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#:key
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(keyring-reference "keyring")
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(report-progress (const #t)))
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"Authenticate COMMITS, a list of commit objects, calling REPORT-PROGRESS for
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each of them. Return an alist showing the number of occurrences of each key.
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The OpenPGP keyring is loaded from KEYRING-REFERENCE in REPOSITORY."
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(define keyring
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(load-keyring-from-reference repository keyring-reference))
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(fold (lambda (commit stats)
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(report-progress)
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(let ((signer (authenticate-commit repository commit keyring)))
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(match (assq signer stats)
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(#f (cons `(,signer . 1) stats))
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((_ . count) (cons `(,signer . ,(+ count 1))
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(alist-delete signer stats))))))
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'()
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commits))
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(define commit-short-id
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(compose (cut string-take <> 7) oid->string commit-id))
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;;;
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;;; Caching.
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;;;
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(define (authenticated-commit-cache-file)
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"Return the name of the file that contains the cache of
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previously-authenticated commits."
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(string-append (cache-directory) "/authentication/channels/guix"))
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(define (previously-authenticated-commits)
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"Return the previously-authenticated commits as a list of commit IDs (hex
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strings)."
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(catch 'system-error
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(lambda ()
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(call-with-input-file (authenticated-commit-cache-file)
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read))
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(lambda args
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(if (= ENOENT (system-error-errno args))
|
||
'()
|
||
(apply throw args)))))
|
||
|
||
(define (cache-authenticated-commit commit-id)
|
||
"Record in ~/.cache COMMIT-ID and its closure as authenticated (only
|
||
COMMIT-ID is written to cache, though)."
|
||
(define %max-cache-length
|
||
;; Maximum number of commits in cache.
|
||
200)
|
||
|
||
(let ((lst (delete-duplicates
|
||
(cons commit-id (previously-authenticated-commits))))
|
||
(file (authenticated-commit-cache-file)))
|
||
(mkdir-p (dirname file))
|
||
(with-atomic-file-output file
|
||
(lambda (port)
|
||
(let ((lst (if (> (length lst) %max-cache-length)
|
||
(take lst %max-cache-length) ;truncate
|
||
lst)))
|
||
(chmod port #o600)
|
||
(display ";; List of previously-authenticated commits.\n\n"
|
||
port)
|
||
(pretty-print lst port))))))
|
||
|
||
|
||
;;;
|
||
;;; Entry point.
|
||
;;;
|
||
|
||
(define (git-authenticate args)
|
||
(define repository
|
||
(repository-open "."))
|
||
|
||
(let loop ((args args))
|
||
(match args
|
||
((_ start end)
|
||
(define start-commit
|
||
(commit-lookup repository (string->oid start)))
|
||
(define end-commit
|
||
(commit-lookup repository (string->oid end)))
|
||
|
||
(define authenticated-commits
|
||
;; Previously-authenticated commits that don't need to be checked
|
||
;; again.
|
||
(filter-map (lambda (id)
|
||
(false-if-exception
|
||
(commit-lookup repository (string->oid id))))
|
||
(previously-authenticated-commits)))
|
||
|
||
(define commits
|
||
;; Commits to authenticate, excluding the closure of
|
||
;; AUTHENTICATED-COMMITS.
|
||
(commit-difference end-commit start-commit
|
||
authenticated-commits))
|
||
|
||
(define reporter
|
||
(progress-reporter/bar (length commits)))
|
||
|
||
(format #t (G_ "Authenticating ~a to ~a (~a commits)...~%")
|
||
(commit-short-id start-commit)
|
||
(commit-short-id end-commit)
|
||
(length commits))
|
||
|
||
(let ((stats (call-with-progress-reporter reporter
|
||
(lambda (report)
|
||
(authenticate-commits repository commits
|
||
#:report-progress report)))))
|
||
(cache-authenticated-commit (oid->string (commit-id end-commit)))
|
||
|
||
(unless (null? stats)
|
||
(format #t (G_ "Signing statistics:~%"))
|
||
(for-each (match-lambda
|
||
((signer . count)
|
||
(format #t " ~a ~10d~%"
|
||
(openpgp-format-fingerprint
|
||
(openpgp-public-key-fingerprint signer))
|
||
count)))
|
||
(sort stats
|
||
(match-lambda*
|
||
(((_ . count1) (_ . count2))
|
||
(> count1 count2))))))))
|
||
((command start)
|
||
(let* ((head (repository-head repository))
|
||
(end (reference-target head)))
|
||
(loop (list command start (oid->string end)))))
|
||
(_
|
||
(format (current-error-port)
|
||
(G_ "Usage: git-authenticate START [END]
|
||
|
||
Authenticate commits START to END or the current head.\n"))))))
|