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sudoers_sethost: refactor code to set host names in sudoers_context.

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The sudoers_sethost() function can be shared by the sudoers plugin,
visudo, cvtsudoers and testsudoers.
This commit is contained in:
Todd C. Miller
2023-09-02 15:25:58 -06:00
parent 0c9ca88f5b
commit 956de5cbbc
10 changed files with 137 additions and 110 deletions
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87
plugins/sudoers/sethost.c Normal file
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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2018-2023 Todd C. Miller <Todd.Miller@sudo.ws>
*
* 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.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sudoers.h"
/*
* Set ctx->user.host. ctx->user.shost, ctx->runas.host and ctx->runas.shost
* based on the local and remote host names. If host is NULL, the local
* host name is used. If remhost is NULL, the same value as host is used.
*/
bool
sudoers_sethost(struct sudoers_context *ctx, const char *host,
const char *remhost)
{
char *cp;
debug_decl(sudoers_sethost, SUDOERS_DEBUG_UTIL);
if (ctx->user.shost != ctx->user.host)
free(ctx->user.shost);
free(ctx->user.host);
ctx->user.host = NULL;
ctx->user.shost = NULL;
if (host == NULL)
ctx->user.host = sudo_gethostname();
else
ctx->user.host = strdup(host);
if (ctx->user.host == NULL)
goto oom;
if ((cp = strchr(ctx->user.host, '.')) != NULL) {
ctx->user.shost = strndup(ctx->user.host,
(size_t)(cp - ctx->user.host));
if (ctx->user.shost == NULL)
goto oom;
} else {
ctx->user.shost = ctx->user.host;
}
if (ctx->runas.shost != ctx->runas.host)
free(ctx->runas.shost);
free(ctx->runas.host);
ctx->runas.host = NULL;
ctx->runas.shost = NULL;
ctx->runas.host = strdup(remhost ? remhost : ctx->user.host);
if (ctx->runas.host == NULL)
goto oom;
if ((cp = strchr(ctx->runas.host, '.')) != NULL) {
ctx->runas.shost = strndup(ctx->runas.host,
(size_t)(cp - ctx->runas.host));
if (ctx->runas.shost == NULL)
goto oom;
} else {
ctx->runas.shost = ctx->runas.host;
}
debug_return_bool(true);
oom:
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_bool(false);
}