/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2004-2005, 2007-2024 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 <time.h>

#include <sudoers.h>

#include <sudo_lbuf.h>

#include <gram.h>

/*

 * Write the contents of a struct member to the lbuf.

 * If alias_type is not UNSPEC, expand aliases using that type with

 * the specified separator (which must not be NULL in the UNSPEC case).

 */

static bool

sudoers_format_member_int(struct sudo_lbuf *lbuf,

    const struct sudoers_parse_tree *parse_tree, const char *name, int type,

    bool negated, const char *separator, short alias_type)

{

    const struct sudoers_context *ctx = parse_tree->ctx;

    struct alias *a;

    const struct member *m;

    const struct sudo_command *c;

    const struct command_digest *digest;

    debug_decl(sudoers_format_member_int, SUDOERS_DEBUG_UTIL);

    switch (type) {

  case MYSELF:

      sudo_lbuf_append(lbuf, "%s%s", negated ? "!" : "",

    ctx->runas.list_pw ? ctx->runas.list_pw->pw_name :

    (ctx->user.name ? ctx->user.name : ""));

      break;

  case ALL:

      if (name == NULL) {

    sudo_lbuf_append(lbuf, "%sALL", negated ? "!" : "");

    break;

      }

      FALLTHROUGH;

  case COMMAND:

      c = (struct sudo_command *) name;

      TAILQ_FOREACH(digest, &c->digests, entries) {

    sudo_lbuf_append(lbuf, "%s:%s%s ",

        digest_type_to_name(digest->digest_type),

        digest->digest_str, TAILQ_NEXT(digest, entries) ? "," : "");

      }

      if (negated)

    sudo_lbuf_append(lbuf, "!");

      if (c->cmnd == NULL || c->cmnd[0] == '^') {

    /* No additional quoting of characters inside a regex. */

    sudo_lbuf_append(lbuf, "%s", c->cmnd ? c->cmnd : "ALL");

      } else {

    sudo_lbuf_append_quoted(lbuf, SUDOERS_QUOTED_CMD, "%s",

        c->cmnd);

      }

      if (c->args != NULL) {

    sudo_lbuf_append(lbuf, " ");

    if (c->args[0] == '^') {

        /* No additional quoting of characters inside a regex. */

        sudo_lbuf_append(lbuf, "%s", c->args);

    } else {

        sudo_lbuf_append_quoted(lbuf, SUDOERS_QUOTED_ARG, "%s",

      c->args);

    }

      }

      break;

  case USERGROUP:

      /* Special case for %#gid, %:non-unix-group, %:#non-unix-gid */

      if (strpbrk(name, " \t") == NULL) {

    if (*++name == ':') {

        name++;

        sudo_lbuf_append(lbuf, "%s", "%:");

    } else {

        sudo_lbuf_append(lbuf, "%s", "%");

    }

      }

      goto print_word;

  case ALIAS:

      if (alias_type != UNSPEC) {

    if ((a = alias_get(parse_tree, name, alias_type)) != NULL) {

        TAILQ_FOREACH(m, &a->members, entries) {

      if (m != TAILQ_FIRST(&a->members))

          sudo_lbuf_append(lbuf, "%s", separator);

      sudoers_format_member_int(lbuf, parse_tree,

          m->name, m->type,

          negated ? !m->negated : m->negated,

          separator, alias_type);

        }

        alias_put(a);

        break;

    }

      }

      FALLTHROUGH;

  default:

  print_word:

      /* Do not quote UID/GID, all others get quoted. */

      if (name[0] == '#' &&

    name[strspn(name + 1, "0123456789") + 1] == '\0') {

    sudo_lbuf_append(lbuf, "%s%s", negated ? "!" : "", name);

      } else {

    if (strpbrk(name, " \t") != NULL) {

        sudo_lbuf_append(lbuf, "%s\"", negated ? "!" : "");

        sudo_lbuf_append_quoted(lbuf, "\"", "%s", name);

        sudo_lbuf_append(lbuf, "\"");

    } else {

        sudo_lbuf_append_quoted(lbuf, SUDOERS_QUOTED, "%s%s",

      negated ? "!" : "", name);

    }

      }

      break;

    }

    debug_return_bool(!sudo_lbuf_error(lbuf));

}

bool

sudoers_format_member(struct sudo_lbuf *lbuf,

    const struct sudoers_parse_tree *parse_tree, const struct member *m,

    const char *separator, short alias_type)

{

    return sudoers_format_member_int(lbuf, parse_tree, m->name, m->type,

  m->negated, separator, alias_type);

}

/*

 * Store a defaults entry as a command tag.

 */

bool

sudoers_defaults_to_tags(const char *var, const char *val, int op,

    struct cmndtag *tags)

{

    bool ret = true;

    debug_decl(sudoers_defaults_to_tags, SUDOERS_DEBUG_UTIL);

    if (op == true || op == false) {

  if (strcmp(var, "authenticate") == 0) {

      tags->nopasswd = op == false;

  } else if (strcmp(var, "sudoedit_follow") == 0) {

      tags->follow = op == true;

  } else if (strcmp(var, "log_input") == 0) {

      tags->log_input = op == true;

  } else if (strcmp(var, "log_output") == 0) {

      tags->log_output = op == true;

  } else if (strcmp(var, "noexec") == 0) {

      tags->noexec = op == true;

  } else if (strcmp(var, "intercept") == 0) {

      tags->intercept = op == true;

  } else if (strcmp(var, "setenv") == 0) {

      tags->setenv = op == true;

  } else if (strcmp(var, "mail_all_cmnds") == 0 ||

      strcmp(var, "mail_always") == 0 ||

      strcmp(var, "mail_no_perms") == 0) {

      tags->send_mail = op == true;

  } else {

      ret = false;

  }

    } else {

  ret = false;

    }

    debug_return_bool(ret);

}

/*

 * Convert a defaults list to command tags.

 */

bool

sudoers_defaults_list_to_tags(const struct defaults_list *defs,

    struct cmndtag *tags)

{

    const struct defaults *d;

    bool ret = true;

    debug_decl(sudoers_defaults_list_to_tags, SUDOERS_DEBUG_UTIL);

    TAGS_INIT(tags);

    if (defs != NULL) {

  TAILQ_FOREACH(d, defs, entries) {

      if (!sudoers_defaults_to_tags(d->var, d->val, d->op, tags)) {

    if (d->val != NULL) {

        sudo_debug_printf(SUDO_DEBUG_WARN,

      "unable to convert defaults to tag: %s%s%s", d->var,

      d->op == '+' ? "+=" : d->op == '-' ? "-=" : "=", d->val);

    } else {

        sudo_debug_printf(SUDO_DEBUG_WARN,

      "unable to convert defaults to tag: %s%s%s",

      d->op == false ? "!" : "", d->var, "");

    }

    ret = false;

      }

  }

    }

    debug_return_bool(ret);

}

#define FIELD_CHANGED(ocs, ncs, fld) \

  ((ocs) == NULL || (ncs)->fld != (ocs)->fld)

#define TAG_CHANGED(ocs, ncs, t, tt) \

  (TAG_SET((t).tt) && FIELD_CHANGED(ocs, ncs, tags.tt))

/*

 * Write a cmndspec to lbuf in sudoers format.

 */

bool

sudoers_format_cmndspec(struct sudo_lbuf *lbuf,

    const struct sudoers_parse_tree *parse_tree, const struct cmndspec *cs,

    const struct cmndspec *prev_cs, struct cmndtag tags, bool expand_aliases)

{

    debug_decl(sudoers_format_cmndspec, SUDOERS_DEBUG_UTIL);

    /* Merge privilege-level tags with cmndspec tags. */

    TAGS_MERGE(tags, cs->tags);

    if (cs->privs != NULL && FIELD_CHANGED(prev_cs, cs, privs))

  sudo_lbuf_append(lbuf, "PRIVS=\"%s\" ", cs->privs);

    if (cs->limitprivs != NULL && FIELD_CHANGED(prev_cs, cs, limitprivs))

  sudo_lbuf_append(lbuf, "LIMITPRIVS=\"%s\" ", cs->limitprivs);

    if (cs->role != NULL && FIELD_CHANGED(prev_cs, cs, role))

  sudo_lbuf_append(lbuf, "ROLE=%s ", cs->role);

    if (cs->type != NULL && FIELD_CHANGED(prev_cs, cs, type))

  sudo_lbuf_append(lbuf, "TYPE=%s ", cs->type);

    if (cs->apparmor_profile != NULL && FIELD_CHANGED(prev_cs, cs, apparmor_profile))

  sudo_lbuf_append(lbuf, "APPARMOR_PROFILE=%s ", cs->apparmor_profile);

    if (cs->runchroot != NULL && FIELD_CHANGED(prev_cs, cs, runchroot))

  sudo_lbuf_append(lbuf, "CHROOT=%s ", cs->runchroot);

    if (cs->runcwd != NULL && FIELD_CHANGED(prev_cs, cs, runcwd))

  sudo_lbuf_append(lbuf, "CWD=%s ", cs->runcwd);

    if (cs->timeout > 0 && FIELD_CHANGED(prev_cs, cs, timeout)) {

  char numbuf[STRLEN_MAX_SIGNED(int) + 1];

  (void)snprintf(numbuf, sizeof(numbuf), "%d", cs->timeout);

  sudo_lbuf_append(lbuf, "TIMEOUT=%s ", numbuf);

    }

    if (cs->notbefore != UNSPEC && FIELD_CHANGED(prev_cs, cs, notbefore)) {

  char buf[sizeof("CCYYMMDDHHMMSSZ")] = "";

  struct tm gmt;

  if (gmtime_r(&cs->notbefore, &gmt) != NULL) {

      size_t len = strftime(buf, sizeof(buf), "%Y%m%d%H%M%SZ", &gmt);

      if (len != 0 && buf[sizeof(buf) - 1] == '\0')

    sudo_lbuf_append(lbuf, "NOTBEFORE=%s ", buf);

  }

    }

    if (cs->notafter != UNSPEC && FIELD_CHANGED(prev_cs, cs, notafter)) {

  char buf[sizeof("CCYYMMDDHHMMSSZ")] = "";

  struct tm gmt;

  if (gmtime_r(&cs->notafter, &gmt) != NULL) {

      size_t len = strftime(buf, sizeof(buf), "%Y%m%d%H%M%SZ", &gmt);

      if (len != 0 && buf[sizeof(buf) - 1] == '\0')

    sudo_lbuf_append(lbuf, "NOTAFTER=%s ", buf);

  }

    }

    if (TAG_CHANGED(prev_cs, cs, tags, setenv))

  sudo_lbuf_append(lbuf, tags.setenv ? "SETENV: " : "NOSETENV: ");

    if (TAG_CHANGED(prev_cs, cs, tags, intercept))

  sudo_lbuf_append(lbuf, tags.intercept ? "INTERCEPT: " : "NOINTERCEPT: ");

    if (TAG_CHANGED(prev_cs, cs, tags, noexec))

  sudo_lbuf_append(lbuf, tags.noexec ? "NOEXEC: " : "EXEC: ");

    if (TAG_CHANGED(prev_cs, cs, tags, nopasswd))

  sudo_lbuf_append(lbuf, tags.nopasswd ? "NOPASSWD: " : "PASSWD: ");

    if (TAG_CHANGED(prev_cs, cs, tags, log_input))

  sudo_lbuf_append(lbuf, tags.log_input ? "LOG_INPUT: " : "NOLOG_INPUT: ");

    if (TAG_CHANGED(prev_cs, cs, tags, log_output))

  sudo_lbuf_append(lbuf, tags.log_output ? "LOG_OUTPUT: " : "NOLOG_OUTPUT: ");

    if (TAG_CHANGED(prev_cs, cs, tags, send_mail))

  sudo_lbuf_append(lbuf, tags.send_mail ? "MAIL: " : "NOMAIL: ");

    if (TAG_CHANGED(prev_cs, cs, tags, follow))

  sudo_lbuf_append(lbuf, tags.follow ? "FOLLOW: " : "NOFOLLOW: ");

    sudoers_format_member(lbuf, parse_tree, cs->cmnd, ", ",

  expand_aliases ? CMNDALIAS : UNSPEC);

    debug_return_bool(!sudo_lbuf_error(lbuf));

}

/*

 * Format and append a defaults entry to the specified lbuf.

 */

bool

sudoers_format_default(struct sudo_lbuf *lbuf, const struct defaults *d)

{

    debug_decl(sudoers_format_default, SUDOERS_DEBUG_UTIL);

    if (d->val != NULL) {

  sudo_lbuf_append(lbuf, "%s%s", d->var,

      d->op == '+' ? "+=" : d->op == '-' ? "-=" : "=");

  if (strpbrk(d->val, " \t") != NULL) {

      sudo_lbuf_append(lbuf, "\"");

      sudo_lbuf_append_quoted(lbuf, "\"", "%s", d->val);

      sudo_lbuf_append(lbuf, "\"");

  } else

      sudo_lbuf_append_quoted(lbuf, SUDOERS_QUOTED, "%s", d->val);

    } else {

  sudo_lbuf_append(lbuf, "%s%s", d->op == false ? "!" : "", d->var);

    }

    debug_return_bool(!sudo_lbuf_error(lbuf));

}