scoutos / prex-0.9.0 / usr / server / exec / exec_cap.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2008, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * exec_cap.c - file capability management routines.
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32 | */
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33 | |||
34 | #include <sys/prex.h> |
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35 | #include <sys/capability.h> |
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36 | #include <string.h> |
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37 | #include <errno.h> |
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38 | |||
39 | #include "exec.h" |
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40 | |||
41 | /*
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42 | * Bind capabilities for the known file.
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43 | */
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44 | void
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45 | bind_cap(char *path, task_t task)
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46 | { |
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47 | const struct cap_map *map; |
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48 | cap_t cap = 0;
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49 | int error;
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50 | |||
51 | /*
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52 | * Set capabilities to the known applications.
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53 | */
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54 | map = &cap_table[0];
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55 | while (map->c_path != NULL) { |
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56 | if (!strncmp(path, map->c_path, PATH_MAX)) {
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57 | cap = map->c_capset; |
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58 | break;
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59 | } |
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60 | map++; |
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61 | } |
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62 | if (cap != 0) { |
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63 | DPRINTF(("exec: set capability:%08x to %s\n", cap, path));
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64 | error = task_setcap(task, cap); |
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65 | if (error)
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66 | sys_panic("exec: no SETPCAP capability");
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67 | } |
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68 | } |
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69 | |||
70 | /*
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71 | * Bind capability for server
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72 | */
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73 | int
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74 | exec_bindcap(struct bind_msg *msg)
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75 | { |
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76 | task_t task; |
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77 | int error;
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78 | |||
79 | task = msg->hdr.task; |
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80 | |||
81 | if (msg->path == NULL) |
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82 | return EFAULT;
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83 | |||
84 | /*
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85 | * Check capability of caller task.
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86 | */
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87 | error = task_chkcap(task, CAP_PROTSERV); |
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88 | if (error != 0) |
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89 | return EPERM;
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90 | |||
91 | /*
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92 | * Set capability
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93 | */
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94 | bind_cap(msg->path, task); |
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95 | |||
96 | return 0; |
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97 | } |