1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
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4 | * All rights reserved.
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5 | *
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6 | * Redistribution and use in source and binary forms, with or without
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7 | * modification, are permitted provided that the following conditions
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8 | * are met:
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9 | * 1. Redistributions of source code must retain the above copyright
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10 | * notice, this list of conditions and the following disclaimer.
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11 | * 2. Redistributions in binary form must reproduce the above copyright
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12 | * notice, this list of conditions and the following disclaimer in the
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13 | * documentation and/or other materials provided with the distribution.
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14 | * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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15 | * may be used to endorse or promote products derived from this software
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16 | * without specific prior written permission.
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17 | *
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18 | * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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21 | * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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28 | * SUCH DAMAGE.
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29 | */
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30 |
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31 | #include "libbb.h"
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32 |
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33 |
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34 | /* Become the user and group(s) specified by PW. */
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35 | const char *change_identity_e2str(const struct passwd *pw)
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36 | {
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37 | if (initgroups(pw->pw_name, pw->pw_gid) == -1)
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38 | return "cannot set groups";
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39 | endgrent(); /* ?? */
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40 | xsetgid(pw->pw_gid);
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41 | xsetuid(pw->pw_uid);
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42 | return NULL;
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43 | }
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44 |
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45 | void change_identity(const struct passwd *pw)
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46 | {
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47 | const char *err_msg = change_identity_e2str(pw);
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48 |
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49 | if (err_msg)
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50 | bb_perror_msg_and_die("%s", err_msg);
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51 | }
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