/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2011-2015 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 <pwd.h>

#include <grp.h>

#include <unistd.h>

#include <sudoers.h>

#include <sudo_iolog.h>

/*

 * Like strlcpy(3) but replaces '/' with '_'.

 */

static size_t

strlcpy_no_slash(char * restrict dst, const char * restrict src, size_t size)

{

    size_t len = 0;

    char ch;

    debug_decl(strlcpy_no_slash, SUDOERS_DEBUG_UTIL);

    while ((ch = *src++) != '\0') {

  if (size > 1) {

      /* Replace '/' with '_' */

      if (ch == '/')

    ch = '_';

      *dst++ = ch;

      size--;

  }

  len++;

    }

    if (size > 0)

  *dst = '\0';

    debug_return_size_t(len);

}

static size_t

fill_seq(char * restrict str, size_t strsize, void * restrict v)

{

#ifdef SUDOERS_NO_SEQ

    debug_decl(fill_seq, SUDOERS_DEBUG_UTIL);

    debug_return_size_t(strlcpy(str, "%{seq}", strsize));

#else

    struct sudoers_context *ctx = v;

    static char sessid[7];

    int len;

    debug_decl(fill_seq, SUDOERS_DEBUG_UTIL);

    if (sessid[0] == '\0') {

  if (!iolog_nextid(ctx->iolog_dir, sessid))

      debug_return_size_t((size_t)-1);

    }

    /* Path is of the form /var/log/sudo-io/00/00/01. */

    len = snprintf(str, strsize, "%c%c/%c%c/%c%c", sessid[0],

  sessid[1], sessid[2], sessid[3], sessid[4], sessid[5]);

    if (len < 0)

  debug_return_size_t(strsize); /* handle non-standard snprintf() */

    debug_return_size_t((size_t)len);

#endif /* SUDOERS_NO_SEQ */

}

static size_t

fill_user(char * restrict str, size_t strsize, void * restrict v)

{

    struct sudoers_context *ctx = v;

    debug_decl(fill_user, SUDOERS_DEBUG_UTIL);

    debug_return_size_t(strlcpy_no_slash(str, ctx->user.name, strsize));

}

static size_t

fill_group(char * restrict str, size_t strsize, void * restrict v)

{

    struct sudoers_context *ctx = v;

    struct group *grp;

    size_t len;

    debug_decl(fill_group, SUDOERS_DEBUG_UTIL);

    if ((grp = sudo_getgrgid(ctx->user.gid)) != NULL) {

  len = strlcpy_no_slash(str, grp->gr_name, strsize);

  sudo_gr_delref(grp);

    } else {

  len = (size_t)snprintf(str, strsize, "#%u", (unsigned int)ctx->user.gid);

    }

    debug_return_size_t(len);

}

static size_t

fill_runas_user(char * restrict str, size_t strsize, void * restrict v)

{

    struct sudoers_context *ctx = v;

    debug_decl(fill_runas_user, SUDOERS_DEBUG_UTIL);

    debug_return_size_t(strlcpy_no_slash(str, ctx->runas.pw->pw_name, strsize));

}

static size_t

fill_runas_group(char * restrict str, size_t strsize, void * restrict v)

{

    struct sudoers_context *ctx = v;

    struct group *grp;

    size_t len;

    debug_decl(fill_runas_group, SUDOERS_DEBUG_UTIL);

    if (ctx->runas.gr != NULL) {

  len = strlcpy_no_slash(str, ctx->runas.gr->gr_name, strsize);

    } else {

  if ((grp = sudo_getgrgid(ctx->runas.pw->pw_gid)) != NULL) {

      len = strlcpy_no_slash(str, grp->gr_name, strsize);

      sudo_gr_delref(grp);

  } else {

      len = (size_t)snprintf(str, strsize, "#%u",

    (unsigned int)ctx->runas.pw->pw_gid);

  }

    }

    debug_return_size_t(len);

}

static size_t

fill_hostname(char * restrict str, size_t strsize, void * restrict v)

{

    struct sudoers_context *ctx = v;

    debug_decl(fill_hostname, SUDOERS_DEBUG_UTIL);

    debug_return_size_t(strlcpy_no_slash(str, ctx->user.shost, strsize));

}

static size_t

fill_command(char * restrict str, size_t strsize, void * restrict v)

{

    struct sudoers_context *ctx = v;

    debug_decl(fill_command, SUDOERS_DEBUG_UTIL);

    debug_return_size_t(strlcpy_no_slash(str, ctx->user.cmnd_base, strsize));

}

/* Note: "seq" must be first in the list. */

static const struct iolog_path_escape path_escapes[] = {

    { "seq", fill_seq },

    { "user", fill_user },

    { "group", fill_group },

    { "runas_user", fill_runas_user },

    { "runas_group", fill_runas_group },

    { "hostname", fill_hostname },

    { "command", fill_command },

    { NULL, NULL }

};

const struct iolog_path_escape *sudoers_iolog_path_escapes = path_escapes;