2 File: PrivilegedOperations.c
4 Abstract: Interface to "ddnswriteconfig" setuid root tool.
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44 #include "PrivilegedOperations.h"
45 #include "ConfigurationAuthority.h"
46 #include <CoreFoundation/CoreFoundation.h>
47 #include <SystemConfiguration/SystemConfiguration.h>
53 #include <AssertMacros.h>
54 #include <Security/Security.h>
56 extern char **environ;
57 Boolean gToolApproved = false;
59 static pid_t execTool(const char *args[])
63 int err = posix_spawn(&child, args[0], NULL, NULL, (char *const *)args, environ);
66 printf("exec of %s failed; err = %d\n", args[0], err);
73 OSStatus EnsureToolInstalled(void)
74 // Make sure that the tool is installed in the right place, with the right privs, and the right version.
80 const char *args[] = { kToolPath, "0", "V", NULL };
81 char toolSourcePath[PATH_MAX] = {};
82 char toolInstallerPath[PATH_MAX] = {};
87 // Check version of installed tool
88 toolPID = execTool(args);
91 waitpid(toolPID, &status, 0);
92 if (WIFEXITED(status) && WEXITSTATUS(status) == PRIV_OP_TOOL_VERS)
96 // Locate our in-bundle copy of privop tool
97 bundleURL = CFBundleCopyBundleURL(CFBundleGetBundleWithIdentifier(CFSTR("com.apple.preference.bonjour")) );
98 if (bundleURL != NULL)
100 CFURLGetFileSystemRepresentation(bundleURL, false, (UInt8*) toolSourcePath, sizeof toolSourcePath);
101 CFURLGetFileSystemRepresentation(bundleURL, false, (UInt8*) toolInstallerPath, sizeof toolInstallerPath);
102 CFRelease(bundleURL);
104 if (strlcat(toolSourcePath, "/Contents/Resources/" kToolName, sizeof toolSourcePath ) >= sizeof toolSourcePath ) return(-1);
105 if (strlcat(toolInstallerPath, "/Contents/Resources/" kToolInstaller, sizeof toolInstallerPath) >= sizeof toolInstallerPath) return(-1);
108 return coreFoundationUnknownErr;
110 // Obtain authorization and run in-bundle copy as root to install it
112 AuthorizationItem aewpRight = { kAuthorizationRightExecute, strlen(toolInstallerPath), toolInstallerPath, 0 };
113 AuthorizationItemSet rights = { 1, &aewpRight };
114 AuthorizationRef authRef;
116 err = AuthorizationCreate(&rights, (AuthorizationEnvironment*) NULL,
117 kAuthorizationFlagInteractionAllowed | kAuthorizationFlagExtendRights |
118 kAuthorizationFlagPreAuthorize, &authRef);
121 char *installerargs[] = { toolSourcePath, NULL };
122 err = AuthorizationExecuteWithPrivileges(authRef, toolInstallerPath, 0, installerargs, (FILE**) NULL);
125 int pid = wait(&status);
126 if (pid > 0 && WIFEXITED(status))
128 err = WEXITSTATUS(status);
131 gToolApproved = true;
137 (void) AuthorizationFree(authRef, kAuthorizationFlagDefaults);
145 static OSStatus ExecWithCmdAndParam(const char *subCmd, CFDataRef paramData)
146 // Execute our privop tool with the supplied subCmd and parameter
148 OSStatus err = noErr;
154 const char *args[] = { kToolPath, NULL, "A", NULL, NULL };
155 AuthorizationExternalForm authExt;
157 err = ExternalizeAuthority(&authExt);
158 require_noerr(err, AuthFailed);
160 dataLen = CFDataGetLength(paramData);
161 buff = (UInt8*) malloc(dataLen * sizeof(UInt8));
162 require_action(buff != NULL, AllocBuffFailed, err=memFullErr;);
164 CFRange all = { 0, dataLen };
165 CFDataGetBytes(paramData, all, buff);
168 commFD = fileno(tmpfile());
169 snprintf(fileNum, sizeof(fileNum), "%d", commFD);
173 // write authority to pipe
174 len = 0; // tag, unused
175 write(commFD, &len, sizeof len);
176 len = sizeof authExt; // len
177 write(commFD, &len, sizeof len);
178 write(commFD, &authExt, len);
180 // write parameter to pipe
181 len = 0; // tag, unused
182 write(commFD, &len, sizeof len);
183 len = dataLen; // len
184 write(commFD, &len, sizeof len);
185 write(commFD, buff, len);
187 child = execTool(args);
191 waitpid(child, &status, 0);
192 if (WIFEXITED(status))
193 err = WEXITSTATUS(status);
194 //fprintf(stderr, "child exited; status = %d (%ld)\n", status, err);
206 WriteBrowseDomain(CFDataRef domainArrayData)
208 if (!CurrentlyAuthorized())
210 return ExecWithCmdAndParam("Wb", domainArrayData);
214 WriteRegistrationDomain(CFDataRef domainArrayData)
216 if (!CurrentlyAuthorized())
218 return ExecWithCmdAndParam("Wd", domainArrayData);
222 WriteHostname(CFDataRef domainArrayData)
224 if (!CurrentlyAuthorized())
226 return ExecWithCmdAndParam("Wh", domainArrayData);
230 SetKeyForDomain(CFDataRef secretData)
232 if (!CurrentlyAuthorized())
234 return ExecWithCmdAndParam("Wk", secretData);