Mercurial > trustbridge > trustbridge

annotate common/util.c @ 671:d4766b4922c9

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Fix linux build
author Andre Heinecke <andre.heinecke@intevation.de>
date Fri, 27 Jun 2014 11:01:14 +0200
parents 175370634226
children 4ad764bfb39c
rev   line source
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1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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8 #include "util.h"
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9 #include "logging.h"
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10 #include "strhelp.h"
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11
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12 #ifndef _WIN32
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13 #include <unistd.h>
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14 #include <sys/types.h>
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15 #include <pwd.h>
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16 #include <grp.h>
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17 #include <string.h>
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18 #else
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19 #include <windows.h>
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20 #endif
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21
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22 #ifdef WIN32
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23 static PSID
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24 copy_sid(PSID from)
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25 {
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26 if (!from)
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27 {
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28 return 0;
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29 }
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30
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31 DWORD sidLength = GetLengthSid(from);
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32 PSID to = (PSID) xmalloc(sidLength);
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33 CopySid(sidLength, to, from);
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34 return to;
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35 }
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36
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37
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38 PSID
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39 get_process_owner(HANDLE hProcess)
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40 {
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41 HANDLE hToken = NULL;
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42 PSID sid;
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43
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44 if (hProcess == NULL)
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45 {
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46 ERRORPRINTF ("invalid call to get_process_owner");
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47 return NULL;
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48 }
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49
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50 OpenProcessToken(hProcess, TOKEN_READ, &hToken);
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51 if (hToken)
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52 {
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53 DWORD size = 0;
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54 PTOKEN_USER userStruct;
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55
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56 // check how much space is needed
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57 GetTokenInformation(hToken, TokenUser, NULL, 0, &size);
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58 if (ERROR_INSUFFICIENT_BUFFER == GetLastError())
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59 {
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60 userStruct = (PTOKEN_USER) xmalloc (size);
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61 GetTokenInformation(hToken, TokenUser, userStruct, size, &size);
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62
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63 sid = copy_sid(userStruct->User.Sid);
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64 CloseHandle(hToken);
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65 xfree (userStruct);
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66 return sid;
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67 }
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68 }
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69 return NULL;
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70 }
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71 #endif
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72
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73 bool
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74 is_elevated()
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75 {
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76 bool ret = false;
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77 #ifndef _WIN32
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78 ret = (geteuid() == 0);
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79 #else
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80 HANDLE hToken = NULL;
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81 if (OpenProcessToken (GetCurrentProcess(), TOKEN_QUERY, &hToken))
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82 {
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83 DWORD elevation;
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84 DWORD cbSize = sizeof (DWORD);
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85 if (GetTokenInformation (hToken, TokenElevation, &elevation,
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86 sizeof (TokenElevation), &cbSize))
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87 {
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88 ret = elevation;
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89 }
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90 }
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91 if (hToken)
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92 CloseHandle (hToken);
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93 #endif
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94 return ret;
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95 }
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96
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97 bool is_admin()
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98 {
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99 #ifndef _WIN32
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100 struct passwd *current_user = getpwuid (geteuid());
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101 int ngroups = 0,
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102 ret = 0,
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103 i = 0;
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104 gid_t * groups = NULL;
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105
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106 if (current_user == NULL)
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107 {
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108 ERRORPRINTF ("Failed to obtain user information.");
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109 return false;
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110 }
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111
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112 ret = getgrouplist (current_user->pw_name, current_user->pw_gid, NULL,
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113 &ngroups);
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114
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115 if (ret != -1 || ngroups <= 0)
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116 {
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117 ERRORPRINTF ("Unknown error in getgrouplist call");
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118 return false;
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119 }
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120
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121 groups = xmalloc (((unsigned int)ngroups) * sizeof (gid_t));
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122
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123 ret = getgrouplist (current_user->pw_name, current_user->pw_gid, groups,
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124 &ngroups);
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125
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126 if (ret != ngroups)
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127 {
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128 ERRORPRINTF ("Group length mismatch.");
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129 xfree (groups);
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130 return false;
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131 }
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132
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133 for (i = 0; i < ngroups; i++)
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134 {
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
135 struct group *gr = getgrgid (groups[i]);
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
136 if (gr == NULL)
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
137 {
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
138 ERRORPRINTF ("Error in group enumeration");
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
139 xfree (groups);
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
140 return false;
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
141 }
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
142 if (strcmp("sudo", gr->gr_name) == 0)
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
143 {
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
144 DEBUGPRINTF ("User is in sudo group \n");
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
145 xfree (groups);
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
146 return true;
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
147 }
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
148 }
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
149
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
150 DEBUGPRINTF ("User is not in sudo group");
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
parents: 505
diff changeset
151
505
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
152 return false;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
153 #else
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
154 bool retval = false;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
155 BOOL in_admin_group = FALSE;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
156 HANDLE hToken = NULL;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
157 HANDLE hTokenToCheck = NULL;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
158 DWORD cbSize = 0;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
159 TOKEN_ELEVATION_TYPE elevation;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
160 BYTE admin_id[SECURITY_MAX_SID_SIZE];
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
161
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
162 if (!OpenProcessToken(GetCurrentProcess(),
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
163 TOKEN_QUERY | TOKEN_DUPLICATE, &hToken))
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
164 {
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
165 PRINTLASTERROR ("Failed to duplicate process token.\n");
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
166 return false;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
167 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
168
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
169 if (!GetTokenInformation(hToken, TokenElevationType, &elevation,
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
170 sizeof(elevation), &cbSize))
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
171 {
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
172 PRINTLASTERROR ("Failed to get token information.\n");
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
173 goto done;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
174 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
175
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
176 /* If limited check the the linked token instead */
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
177 if (TokenElevationTypeLimited == elevation)
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
178 {
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
179 if (!GetTokenInformation(hToken, TokenLinkedToken, &hTokenToCheck,
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
180 sizeof(hTokenToCheck), &cbSize))
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
181 {
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
182 PRINTLASTERROR ("Failed to get the linked token.\n");
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
183 goto done;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
184 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
185 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
186
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
187 if (!hTokenToCheck) /* The linked token is already of the correct type */
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
188 {
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
189 if (!DuplicateToken(hToken, SecurityIdentification, &hTokenToCheck))
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
190 {
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
191 PRINTLASTERROR ("Failed to duplicate token for identification.\n");
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
192 goto done;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
193 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
194 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
195
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
196 /* Do the sid dance for the adminSID */
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
197 cbSize = sizeof(admin_id);
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
198 if (!CreateWellKnownSid(WinBuiltinAdministratorsSid, NULL, &admin_id,
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
199 &cbSize))
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
200 {
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
201 PRINTLASTERROR ("Failed to get admin sid.\n");
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
202 goto done;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
203 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
204
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
205 /* The actual check */
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
206 if (!CheckTokenMembership(hTokenToCheck, &admin_id, &in_admin_group))
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
207 {
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
208 PRINTLASTERROR ("Failed to check token membership.\n");
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
209 goto done;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
210 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
211
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
212 if (in_admin_group)
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
213 {
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
214 /* Winbool to standard bool */
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
215 retval = true;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
216 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
217
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
218 done:
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
219 if (hToken) CloseHandle(hToken);
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
220 if (hTokenToCheck) CloseHandle(hTokenToCheck);
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
221
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
222 return retval;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
223 #endif
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
224 }
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
225
http://wald.intevation.org/projects/trustbridge/