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create and verify tags signed by SSH keys This adds a new -s flag to 'got tag' that specifies the signer identity (for example, a key file) of the tagger. The tag object will include a signature that validates each of the tag object headers and the tag message. Verifying these signed tags requires maintaining an allowed signers file which maps signer identities (i.e. the email address of the tagger) to SSH public keys. See ssh-keygen(1) for more details of the allowed signers file. After creating this file and providing the path to it in got.conf(5) using the allowed_signers option, tags may be verified using with 'got tag -V tag_name'. The return code will be non-zero if a signature fails to verify. ok stsp@
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 1 4d5ee956 2022-07-02 jrick /*

 2 4d5ee956 2022-07-02 jrick  * Copyright (c) 2022 Josh Rickmar <jrick@zettaport.com>

 3 4d5ee956 2022-07-02 jrick  *

 4 4d5ee956 2022-07-02 jrick  * Permission to use, copy, modify, and distribute this software for any

 5 4d5ee956 2022-07-02 jrick  * purpose with or without fee is hereby granted, provided that the above

 6 4d5ee956 2022-07-02 jrick  * copyright notice and this permission notice appear in all copies.

 7 4d5ee956 2022-07-02 jrick  *

 8 4d5ee956 2022-07-02 jrick  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 9 4d5ee956 2022-07-02 jrick  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

10 4d5ee956 2022-07-02 jrick  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

11 4d5ee956 2022-07-02 jrick  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

12 4d5ee956 2022-07-02 jrick  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

13 4d5ee956 2022-07-02 jrick  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

14 4d5ee956 2022-07-02 jrick  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

15 4d5ee956 2022-07-02 jrick  */

16 4d5ee956 2022-07-02 jrick 

17 4d5ee956 2022-07-02 jrick #include <stdio.h>

18 4d5ee956 2022-07-02 jrick 

19 4d5ee956 2022-07-02 jrick #include "got_date.h"

20 4d5ee956 2022-07-02 jrick 

21 4d5ee956 2022-07-02 jrick void

22 4d5ee956 2022-07-02 jrick got_date_format_gmtoff(char *buf, size_t sz, time_t gmtoff)

23 4d5ee956 2022-07-02 jrick {

24 4d5ee956 2022-07-02 jrick 	long long h, m;

25 4d5ee956 2022-07-02 jrick 	char sign = '+';

26 4d5ee956 2022-07-02 jrick 

27 4d5ee956 2022-07-02 jrick 	if (gmtoff < 0) {

28 4d5ee956 2022-07-02 jrick 		sign = '-';

29 4d5ee956 2022-07-02 jrick 		gmtoff = -gmtoff;

30 4d5ee956 2022-07-02 jrick 	}

31 4d5ee956 2022-07-02 jrick 

32 4d5ee956 2022-07-02 jrick 	h = (long long)gmtoff / 3600;

33 4d5ee956 2022-07-02 jrick 	m = ((long long)gmtoff - h*3600) / 60;

34 4d5ee956 2022-07-02 jrick 	snprintf(buf, sz, "%c%02lld%02lld", sign, h, m);

35 4d5ee956 2022-07-02 jrick }