thodg/got/lib/gotconfig.c

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• Hash : 4d5ee956
  Author :
  Date : 2022-07-02T21:27:21
  

  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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• lib/gotconfig.c

• /*
   * Copyright (c) 2020 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/types.h>
  #include <sys/queue.h>
  #include <sys/uio.h>
  #include <sys/socket.h>
  
  #include <unistd.h>
  #include <fcntl.h>
  #include <errno.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <stdint.h>
  #include <imsg.h>
  #include <sha1.h>
  #include <limits.h>
  
  #include "got_error.h"
  #include "got_object.h"
  #include "got_repository.h"
  
  #include "got_lib_delta.h"
  #include "got_lib_object.h"
  #include "got_lib_privsep.h"
  #include "got_lib_gotconfig.h"
  
  #include "got_gotconfig.h"
  
  const struct got_error *
  got_gotconfig_read(struct got_gotconfig **conf, const char *gotconfig_path)
  {
  	const struct got_error *err = NULL, *child_err = NULL;
  	int fd = -1;
  	int imsg_fds[2] = { -1, -1 };
  	pid_t pid;
  	struct imsgbuf *ibuf;
  
  	*conf = calloc(1, sizeof(**conf));
  	if (*conf == NULL)
  		return got_error_from_errno("calloc");
  
  	fd = open(gotconfig_path, O_RDONLY | O_CLOEXEC);
  	if (fd == -1) {
  		if (errno == ENOENT)
  			return NULL;
  		return got_error_from_errno2("open", gotconfig_path);
  	}
  
  	ibuf = calloc(1, sizeof(*ibuf));
  	if (ibuf == NULL) {
  		err = got_error_from_errno("calloc");
  		goto done;
  	}
  
  	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
  		err = got_error_from_errno("socketpair");
  		goto done;
  	}
  
  	pid = fork();
  	if (pid == -1) {
  		err = got_error_from_errno("fork");
  		goto done;
  	} else if (pid == 0) {
  		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GOTCONFIG,
  		    gotconfig_path);
  		/* not reached */
  	}
  
  	if (close(imsg_fds[1]) == -1) {
  		err = got_error_from_errno("close");
  		goto done;
  	}
  	imsg_fds[1] = -1;
  	imsg_init(ibuf, imsg_fds[0]);
  
  	err = got_privsep_send_gotconfig_parse_req(ibuf, fd);
  	if (err)
  		goto done;
  	fd = -1;
  
  	err = got_privsep_send_gotconfig_author_req(ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_recv_gotconfig_str(&(*conf)->author, ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_send_gotconfig_allowed_signers_req(ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_recv_gotconfig_str(&(*conf)->allowed_signers_file,
  	    ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_send_gotconfig_revoked_signers_req(ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_recv_gotconfig_str(&(*conf)->revoked_signers_file,
  	    ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_send_gotconfig_remotes_req(ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_recv_gotconfig_remotes(&(*conf)->remotes,
  	    &(*conf)->nremotes, ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_send_stop(imsg_fds[0]);
  	child_err = got_privsep_wait_for_child(pid);
  	if (child_err && err == NULL)
  		err = child_err;
  done:
  	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	if (fd != -1 && close(fd) == -1 && err == NULL)
  		err = got_error_from_errno2("close", gotconfig_path);
  	if (err) {
  		got_gotconfig_free(*conf);
  		*conf = NULL;
  	}
  	free(ibuf);
  	return err;
  }
  
  void
  got_gotconfig_free(struct got_gotconfig *conf)
  {
  	int i;
  
  	if (conf == NULL)
  		return;
  
  	free(conf->author);
  
  	for (i = 0; i < conf->nremotes; i++)
  		got_repo_free_remote_repo_data(&conf->remotes[i]);
  	free(conf->remotes);
  	free(conf);
  }
  
  const char *
  got_gotconfig_get_author(const struct got_gotconfig *conf)
  {
  	return conf->author;
  }
  
  void
  got_gotconfig_get_remotes(int *nremotes, const struct got_remote_repo **remotes,
      const struct got_gotconfig *conf)
  {
  	*nremotes = conf->nremotes;
  	*remotes = conf->remotes;
  }
  
  const char *
  got_gotconfig_get_allowed_signers_file(const struct got_gotconfig *conf)
  {
  	return conf->allowed_signers_file;
  }
  
  const char *
  got_gotconfig_get_revoked_signers_file(const struct got_gotconfig *conf)
  {
  	return conf->revoked_signers_file;
  }
  

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