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annotate common/util.c @ 644:c7a35fa302ec

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Check sudo group membership if user to determine if he can elevate privileges
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 24 Jun 2014 18:10:10 +0200
parents 78959fd970b0
children 175370634226
rev   line source
404
17e1c8f37d72 Add License
Andre Heinecke <aheinecke@intevation.de>
parents: 338
diff changeset
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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Andre Heinecke <aheinecke@intevation.de>
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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 */
321
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8 #include "util.h"
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9 #include "logging.h"
644
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10 #include "strhelp.h"
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11
323
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12 #ifndef _WIN32
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13 #include <unistd.h>
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14 #include <sys/types.h>
644
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15 #include <pwd.h>
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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16 #include <grp.h>
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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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
824ef90a6721 Move is_elevated into common/util.c file for better reuse
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21
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22 bool
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23 is_elevated()
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24 {
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25 bool ret = false;
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26 #ifndef _WIN32
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27 ret = (geteuid() == 0);
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28 #else
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29 HANDLE hToken = NULL;
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30 if (OpenProcessToken (GetCurrentProcess(), TOKEN_QUERY, &hToken))
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31 {
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32 DWORD elevation;
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33 DWORD cbSize = sizeof (DWORD);
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34 if (GetTokenInformation (hToken, TokenElevation, &elevation,
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Sascha Wilde <wilde@intevation.de>
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35 sizeof (TokenElevation), &cbSize))
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36 {
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37 ret = elevation;
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38 }
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39 }
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40 if (hToken)
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41 CloseHandle (hToken);
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42 #endif
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43 return ret;
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44 }
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45
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46 bool is_admin()
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47 {
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48 #ifndef _WIN32
644
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49 struct passwd *current_user = getpwuid (geteuid());
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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50 int ngroups = 0,
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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51 ret = 0,
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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52 i = 0;
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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53 gid_t * groups = NULL;
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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54
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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55 if (current_user == NULL)
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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56 {
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57 ERRORPRINTF ("Failed to obtain user information.");
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58 return false;
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59 }
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60
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61 ret = getgrouplist (current_user->pw_name, current_user->pw_gid, NULL,
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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62 &ngroups);
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63
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64 if (ret != -1 || ngroups <= 0)
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65 {
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66 ERRORPRINTF ("Unknown error in getgrouplist call");
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67 return false;
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68 }
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69
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70 groups = xmalloc (((unsigned int)ngroups) * sizeof (gid_t));
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71
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72 ret = getgrouplist (current_user->pw_name, current_user->pw_gid, groups,
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73 &ngroups);
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74
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75 if (ret != ngroups)
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76 {
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77 ERRORPRINTF ("Group length mismatch.");
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78 xfree (groups);
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79 return false;
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80 }
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81
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82 for (i = 0; i < ngroups; i++)
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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83 {
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84 struct group *gr = getgrgid (groups[i]);
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85 if (gr == NULL)
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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86 {
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87 ERRORPRINTF ("Error in group enumeration");
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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88 xfree (groups);
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89 return false;
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90 }
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91 if (strcmp("sudo", gr->gr_name) == 0)
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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92 {
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93 DEBUGPRINTF ("User is in sudo group \n");
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94 xfree (groups);
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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95 return true;
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
Andre Heinecke <andre.heinecke@intevation.de>
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96 }
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
97 }
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98
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99 DEBUGPRINTF ("User is not in sudo group");
c7a35fa302ec Check sudo group membership if user to determine if he can elevate privileges
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diff changeset
100
505
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101 return false;
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102 #else
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103 bool retval = false;
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104 BOOL in_admin_group = FALSE;
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105 HANDLE hToken = NULL;
78959fd970b0 Add is_admin and implement it for windows
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106 HANDLE hTokenToCheck = NULL;
78959fd970b0 Add is_admin and implement it for windows
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107 DWORD cbSize = 0;
78959fd970b0 Add is_admin and implement it for windows
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108 TOKEN_ELEVATION_TYPE elevation;
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109 BYTE admin_id[SECURITY_MAX_SID_SIZE];
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diff changeset
110
78959fd970b0 Add is_admin and implement it for windows
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diff changeset
111 if (!OpenProcessToken(GetCurrentProcess(),
78959fd970b0 Add is_admin and implement it for windows
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112 TOKEN_QUERY | TOKEN_DUPLICATE, &hToken))
78959fd970b0 Add is_admin and implement it for windows
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113 {
78959fd970b0 Add is_admin and implement it for windows
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114 PRINTLASTERROR ("Failed to duplicate process token.\n");
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115 return false;
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116 }
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diff changeset
117
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diff changeset
118 if (!GetTokenInformation(hToken, TokenElevationType, &elevation,
78959fd970b0 Add is_admin and implement it for windows
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diff changeset
119 sizeof(elevation), &cbSize))
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diff changeset
120 {
78959fd970b0 Add is_admin and implement it for windows
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121 PRINTLASTERROR ("Failed to get token information.\n");
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122 goto done;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
123 }
78959fd970b0 Add is_admin and implement it for windows
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diff changeset
124
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diff changeset
125 /* If limited check the the linked token instead */
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diff changeset
126 if (TokenElevationTypeLimited == elevation)
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diff changeset
127 {
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diff changeset
128 if (!GetTokenInformation(hToken, TokenLinkedToken, &hTokenToCheck,
78959fd970b0 Add is_admin and implement it for windows
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parents: 404
diff changeset
129 sizeof(hTokenToCheck), &cbSize))
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diff changeset
130 {
78959fd970b0 Add is_admin and implement it for windows
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diff changeset
131 PRINTLASTERROR ("Failed to get the linked token.\n");
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132 goto done;
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diff changeset
133 }
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diff changeset
134 }
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diff changeset
135
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diff changeset
136 if (!hTokenToCheck) /* The linked token is already of the correct type */
78959fd970b0 Add is_admin and implement it for windows
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diff changeset
137 {
78959fd970b0 Add is_admin and implement it for windows
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parents: 404
diff changeset
138 if (!DuplicateToken(hToken, SecurityIdentification, &hTokenToCheck))
78959fd970b0 Add is_admin and implement it for windows
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diff changeset
139 {
78959fd970b0 Add is_admin and implement it for windows
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diff changeset
140 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
141 goto done;
78959fd970b0 Add is_admin and implement it for windows
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142 }
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parents: 404
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143 }
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parents: 404
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144
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145 /* Do the sid dance for the adminSID */
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146 cbSize = sizeof(admin_id);
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147 if (!CreateWellKnownSid(WinBuiltinAdministratorsSid, NULL, &admin_id,
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diff changeset
148 &cbSize))
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149 {
78959fd970b0 Add is_admin and implement it for windows
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150 PRINTLASTERROR ("Failed to get admin sid.\n");
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parents: 404
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151 goto done;
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
152 }
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
153
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parents: 404
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154 /* The actual check */
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parents: 404
diff changeset
155 if (!CheckTokenMembership(hTokenToCheck, &admin_id, &in_admin_group))
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
156 {
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parents: 404
diff changeset
157 PRINTLASTERROR ("Failed to check token membership.\n");
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
158 goto done;
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
159 }
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
160
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parents: 404
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161 if (in_admin_group)
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parents: 404
diff changeset
162 {
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parents: 404
diff changeset
163 /* Winbool to standard bool */
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
164 retval = true;
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parents: 404
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165 }
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
166
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
167 done:
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
168 if (hToken) CloseHandle(hToken);
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parents: 404
diff changeset
169 if (hTokenToCheck) CloseHandle(hTokenToCheck);
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
170
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
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171 return retval;
78959fd970b0 Add is_admin and implement it for windows
Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
172 #endif
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
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173 }
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Andre Heinecke <aheinecke@intevation.de>
parents: 404
diff changeset
174
http://wald.intevation.org/projects/trustbridge/