1 | /*
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2 | * runcon [ context |
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3 | * ( [ -c ] [ -r role ] [-t type] [ -u user ] [ -l levelrange ] )
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4 | * command [arg1 [arg2 ...] ]
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5 | *
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6 | * attempt to run the specified command with the specified context.
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7 | *
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8 | * -r role : use the current context with the specified role
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9 | * -t type : use the current context with the specified type
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10 | * -u user : use the current context with the specified user
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11 | * -l level : use the current context with the specified level range
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12 | * -c : compute process transition context before modifying
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13 | *
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14 | * Contexts are interpreted as follows:
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15 | *
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16 | * Number of MLS
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17 | * components system?
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18 | *
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19 | * 1 - type
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20 | * 2 - role:type
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21 | * 3 Y role:type:range
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22 | * 3 N user:role:type
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23 | * 4 Y user:role:type:range
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24 | * 4 N error
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25 | *
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26 | * Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
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27 | * - based on coreutils-5.97 (in Fedora Core 6)
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28 | */
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29 | #include <getopt.h>
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30 | #include <selinux/context.h>
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31 | #include <selinux/flask.h>
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32 |
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33 | #include "libbb.h"
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34 |
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35 | static context_t runcon_compute_new_context(char *user, char *role, char *type, char *range,
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36 | char *command, int compute_trans)
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37 | {
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38 | context_t con;
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39 | security_context_t cur_context;
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40 |
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41 | if (getcon(&cur_context))
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42 | bb_error_msg_and_die("cannot get current context");
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43 |
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44 | if (compute_trans) {
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45 | security_context_t file_context, new_context;
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46 |
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47 | if (getfilecon(command, &file_context) < 0)
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48 | bb_error_msg_and_die("cannot retrieve attributes of '%s'",
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49 | command);
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50 | if (security_compute_create(cur_context, file_context,
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51 | SECCLASS_PROCESS, &new_context))
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52 | bb_error_msg_and_die("unable to compute a new context");
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53 | cur_context = new_context;
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54 | }
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55 |
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56 | con = context_new(cur_context);
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57 | if (!con)
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58 | bb_error_msg_and_die("'%s' is not a valid context", cur_context);
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59 | if (user && context_user_set(con, user))
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60 | bb_error_msg_and_die("failed to set new user '%s'", user);
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61 | if (type && context_type_set(con, type))
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62 | bb_error_msg_and_die("failed to set new type '%s'", type);
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63 | if (range && context_range_set(con, range))
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64 | bb_error_msg_and_die("failed to set new range '%s'", range);
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65 | if (role && context_role_set(con, role))
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66 | bb_error_msg_and_die("failed to set new role '%s'", role);
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67 |
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68 | return con;
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69 | }
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70 |
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71 | #if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
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72 | static const char runcon_longopts[] ALIGN1 =
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73 | "user\0" Required_argument "u"
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74 | "role\0" Required_argument "r"
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75 | "type\0" Required_argument "t"
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76 | "range\0" Required_argument "l"
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77 | "compute\0" No_argument "c"
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78 | "help\0" No_argument "h"
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79 | ;
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80 | #endif
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81 |
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82 | #define OPTS_ROLE (1<<0) /* r */
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83 | #define OPTS_TYPE (1<<1) /* t */
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84 | #define OPTS_USER (1<<2) /* u */
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85 | #define OPTS_RANGE (1<<3) /* l */
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86 | #define OPTS_COMPUTE (1<<4) /* c */
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87 | #define OPTS_HELP (1<<5) /* h */
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88 | #define OPTS_CONTEXT_COMPONENT (OPTS_ROLE | OPTS_TYPE | OPTS_USER | OPTS_RANGE)
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89 |
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90 | int runcon_main(int argc, char **argv);
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91 | int runcon_main(int argc, char **argv)
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92 | {
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93 | char *role = NULL;
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94 | char *range = NULL;
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95 | char *user = NULL;
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96 | char *type = NULL;
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97 | char *context = NULL;
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98 | unsigned opts;
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99 | context_t con;
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100 |
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101 | selinux_or_die();
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102 |
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103 | #if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
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104 | applet_long_options = runcon_longopts;
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105 | #endif
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106 | opt_complementary = "-1";
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107 | opts = getopt32(argv, "r:t:u:l:ch", &role, &type, &user, &range);
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108 | argv += optind;
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109 |
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110 | if (!(opts & OPTS_CONTEXT_COMPONENT)) {
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111 | context = *argv++;
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112 | if (!argv[0])
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113 | bb_error_msg_and_die("no command given");
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114 | }
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115 |
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116 | if (context) {
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117 | con = context_new(context);
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118 | if (!con)
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119 | bb_error_msg_and_die("'%s' is not a valid context", context);
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120 | } else {
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121 | con = runcon_compute_new_context(user, role, type, range,
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122 | argv[0], opts & OPTS_COMPUTE);
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123 | }
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124 |
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125 | if (security_check_context(context_str(con)))
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126 | bb_error_msg_and_die("'%s' is not a valid context",
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127 | context_str(con));
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128 |
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129 | if (setexeccon(context_str(con)))
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130 | bb_error_msg_and_die("cannot set up security context '%s'",
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131 | context_str(con));
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132 |
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133 | execvp(argv[0], argv);
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134 |
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135 | bb_perror_msg_and_die("cannot execute '%s'", argv[0]);
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136 | }
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