├── LICENSE ├── README.md ├── pam_touchid.xcodeproj ├── project.pbxproj ├── project.xcworkspace │ └── contents.xcworkspacedata └── xcuserdata │ └── hamzasood.xcuserdatad │ └── xcschemes │ ├── pam_touchid.xcscheme │ └── xcschememanagement.plist ├── pam_touchid └── pam_touchid.m └── screenshot.png /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | A PAM module for authentication with Touch ID. 2 | ![alt](screenshot.png) 3 | 4 | The module takes an optional parameter: "reason". 5 | Its value will be shown in the dialog presented to the user. 6 | If the argument is omitted, generic text is used. 7 | 8 | 9 | *Warning*: 10 | Do not procede unless you're 1,000,000% sure what you're doing. 11 | If you're only 999,999% sure, then turn back now. 12 | 13 | 14 | # Installation 15 | 1. Build the project 16 | 2. Copy `pam_touchid.so.2` to `/usr/local/lib/pam/` and set: 17 | * Permissions: 444 18 | * Owner: root 19 | * Group: wheel 20 | 21 | # Configuring sudo to use it 22 | 1. Open up`/etc/pam.d/sudo` in your favourite text editor 23 | 2. Add `auth sufficient pam_touchid.so reason="execute a command as another user"` to the top of the file 24 | 25 | The procedure is pretty much the same for any other process, but you'd edit a different config file and probably change the reason too. 26 | 27 | # If you get locked out of sudo 28 | 1. Feel bad that you lied about being 1,000,000% sure what you're doing 29 | 2. Enable the root user through system preferences and use `su` to put the config file back -------------------------------------------------------------------------------- /pam_touchid.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 46; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | 6FA9C8B71DDFA3DC00F8774F /* pam_touchid.m in Sources */ = {isa = PBXBuildFile; fileRef = 6FA9C8B61DDFA3DC00F8774F /* pam_touchid.m */; }; 11 | /* End PBXBuildFile section */ 12 | 13 | /* Begin PBXFileReference section */ 14 | 6FA9C8B11DDFA3DC00F8774F /* pam_touchid.so.2 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.dylib"; includeInIndex = 0; path = pam_touchid.so.2; sourceTree = BUILT_PRODUCTS_DIR; }; 15 | 6FA9C8B61DDFA3DC00F8774F /* pam_touchid.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = pam_touchid.m; sourceTree = ""; }; 16 | /* End PBXFileReference section */ 17 | 18 | /* Begin PBXFrameworksBuildPhase section */ 19 | 6FA9C8AE1DDFA3DC00F8774F /* Frameworks */ = { 20 | isa = PBXFrameworksBuildPhase; 21 | buildActionMask = 2147483647; 22 | files = ( 23 | ); 24 | runOnlyForDeploymentPostprocessing = 0; 25 | }; 26 | /* End PBXFrameworksBuildPhase section */ 27 | 28 | /* Begin PBXGroup section */ 29 | 6FA9C8A81DDFA3DC00F8774F = { 30 | isa = PBXGroup; 31 | children = ( 32 | 6FA9C8B31DDFA3DC00F8774F /* pam_touchid */, 33 | 6FA9C8B21DDFA3DC00F8774F /* Products */, 34 | ); 35 | sourceTree = ""; 36 | }; 37 | 6FA9C8B21DDFA3DC00F8774F /* Products */ = { 38 | isa = PBXGroup; 39 | children = ( 40 | 6FA9C8B11DDFA3DC00F8774F /* pam_touchid.so.2 */, 41 | ); 42 | name = Products; 43 | sourceTree = ""; 44 | }; 45 | 6FA9C8B31DDFA3DC00F8774F /* pam_touchid */ = { 46 | isa = PBXGroup; 47 | children = ( 48 | 6FA9C8B61DDFA3DC00F8774F /* pam_touchid.m */, 49 | ); 50 | path = pam_touchid; 51 | sourceTree = ""; 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88 | attributes = { 89 | LastUpgradeCheck = 0820; 90 | ORGANIZATIONNAME = "Hamza Sood"; 91 | TargetAttributes = { 92 | 6FA9C8B01DDFA3DC00F8774F = { 93 | CreatedOnToolsVersion = 8.2; 94 | ProvisioningStyle = Automatic; 95 | }; 96 | }; 97 | }; 98 | buildConfigurationList = 6FA9C8AC1DDFA3DC00F8774F /* Build configuration list for PBXProject "pam_touchid" */; 99 | compatibilityVersion = "Xcode 3.2"; 100 | developmentRegion = English; 101 | hasScannedForEncodings = 0; 102 | knownRegions = ( 103 | en, 104 | ); 105 | mainGroup = 6FA9C8A81DDFA3DC00F8774F; 106 | productRefGroup = 6FA9C8B21DDFA3DC00F8774F /* Products */; 107 | projectDirPath = ""; 108 | projectRoot = ""; 109 | targets = ( 110 | 6FA9C8B01DDFA3DC00F8774F /* pam_touchid */, 111 | ); 112 | }; 113 | /* End PBXProject section */ 114 | 115 | /* Begin PBXSourcesBuildPhase section */ 116 | 6FA9C8AD1DDFA3DC00F8774F /* Sources */ = { 117 | isa = PBXSourcesBuildPhase; 118 | buildActionMask = 2147483647; 119 | files = ( 120 | 6FA9C8B71DDFA3DC00F8774F /* pam_touchid.m in Sources */, 121 | ); 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241 | buildConfigurations = ( 242 | 6FA9C8B81DDFA3DC00F8774F /* Debug */, 243 | 6FA9C8B91DDFA3DC00F8774F /* Release */, 244 | ); 245 | defaultConfigurationIsVisible = 0; 246 | defaultConfigurationName = Release; 247 | }; 248 | 6FA9C8BA1DDFA3DC00F8774F /* Build configuration list for PBXNativeTarget "pam_touchid" */ = { 249 | isa = XCConfigurationList; 250 | buildConfigurations = ( 251 | 6FA9C8BB1DDFA3DC00F8774F /* Debug */, 252 | 6FA9C8BC1DDFA3DC00F8774F /* Release */, 253 | ); 254 | defaultConfigurationIsVisible = 0; 255 | defaultConfigurationName = Release; 256 | }; 257 | /* End XCConfigurationList section */ 258 | }; 259 | rootObject = 6FA9C8A91DDFA3DC00F8774F /* Project object */; 260 | } 261 | -------------------------------------------------------------------------------- /pam_touchid.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /pam_touchid.xcodeproj/xcuserdata/hamzasood.xcuserdatad/xcschemes/pam_touchid.xcscheme: -------------------------------------------------------------------------------- 1 | 2 | 5 | 8 | 9 | 15 | 21 | 22 | 23 | 24 | 25 | 30 | 31 | 32 | 33 | 34 | 35 | 45 | 46 | 52 | 53 | 54 | 55 | 56 | 57 | 63 | 64 | 70 | 71 | 72 | 73 | 75 | 76 | 79 | 80 | 81 | -------------------------------------------------------------------------------- /pam_touchid.xcodeproj/xcuserdata/hamzasood.xcuserdatad/xcschemes/xcschememanagement.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | SchemeUserState 6 | 7 | pam_touchid.xcscheme 8 | 9 | orderHint 10 | 0 11 | 12 | 13 | SuppressBuildableAutocreation 14 | 15 | 6FA9C8B01DDFA3DC00F8774F 16 | 17 | primary 18 | 19 | 20 | 21 | 22 | 23 | -------------------------------------------------------------------------------- /pam_touchid/pam_touchid.m: -------------------------------------------------------------------------------- 1 | // 2 | // pam_touchid.m 3 | // pam_touchid 4 | // 5 | // Created by Hamza Sood on 18/11/2016. 6 | // Copyright © 2016 Hamza Sood. All rights reserved. 7 | // 8 | 9 | #import 10 | #import 11 | #import 12 | 13 | #include 14 | #include 15 | 16 | // Defined below 17 | static NSString *__nullable FindReason(int argc, const char **argv); 18 | 19 | 20 | // Ignore requests for the stuff we don't support 21 | PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv) { return PAM_IGNORE; } 22 | PAM_EXTERN int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv) { return PAM_IGNORE; } 23 | PAM_EXTERN int pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv) { return PAM_IGNORE; } 24 | 25 | PAM_EXTERN int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv) { 26 | 27 | __block int result = PAM_AUTH_ERR; 28 | dispatch_semaphore_t semaphore = dispatch_semaphore_create(0); 29 | 30 | NSString *reason = FindReason(argc, argv); 31 | if (reason.length == 0) 32 | reason = @"perform an action that requires authentication"; 33 | 34 | // The public policies use the calling process uid to filter fingerprints 35 | // sudo runs as root, and root probably won't have fingerprints enrolled 36 | // So use a policy that ignores uid 37 | [[[LAContext alloc]init] 38 | evaluatePolicy: 0x3f0 39 | localizedReason: reason 40 | reply:^(BOOL success, NSError * _Nullable error) { 41 | if (success) { 42 | result = PAM_SUCCESS; 43 | } 44 | else { 45 | fprintf(stderr, "%s\n", error.localizedDescription.UTF8String); 46 | result = PAM_AUTH_ERR; 47 | } 48 | dispatch_semaphore_signal(semaphore); 49 | }]; 50 | 51 | dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER); 52 | return result; 53 | } 54 | 55 | 56 | // Parse the arguments and try to find the given reason 57 | // Returns nil if it wasn't found 58 | static NSString *FindReason(int argc, const char **argv) { 59 | 60 | // Unfortunately, the version of OpenPAM that ships with macOS doesn't have openpam_readword 61 | // So quoted expressions aren't handled correctly, and are still broken up by spaces 62 | // e.g. key="my value" becomes [key="my, value"] 63 | // So we need to parse the arguments manually 64 | 65 | const char *key = "reason="; 66 | size_t keyLen = strlen(key); 67 | 68 | int keyIdx = -1; 69 | for (int i = 0; i < argc; ++i) { 70 | if (strncmp(argv[i], key, keyLen) == 0) { 71 | keyIdx = i; 72 | break; 73 | } 74 | } 75 | 76 | if (keyIdx == -1) 77 | return nil; 78 | 79 | char firstChar = argv[keyIdx][keyLen]; 80 | if (firstChar == '\'' || firstChar == '"') { 81 | // This is a quoted expression 82 | // So we need to loop over the remaining arguments and keep adding text until we find the end quote 83 | NSMutableString *result = [[NSMutableString alloc]init]; 84 | 85 | // Index of the current argument in the loop 86 | int i = keyIdx; 87 | 88 | // String for the current argument in the loop 89 | // Start with the argument containing the key, but skip the key and the opening quote 90 | const char *p = argv[keyIdx] + keyLen + 1; 91 | 92 | while (true) { 93 | const char *endQuotePtr = strchr(p, firstChar); 94 | if (endQuotePtr) { 95 | // This argument contains the end quote 96 | // So add up to the quote and stop 97 | [result appendString:[[NSString alloc]initWithBytes:p 98 | length:(endQuotePtr - p) 99 | encoding:NSUTF8StringEncoding]]; 100 | break; 101 | } 102 | else { 103 | // No end quote (yet) 104 | // So add the text and move on 105 | [result appendString:@(p)]; 106 | 107 | if (i < argc-1) { 108 | // There're more arguments to come 109 | // Add a space and get the next values for i and p 110 | [result appendString:@" "]; 111 | p = argv[++i]; 112 | } 113 | else { 114 | // This was the last argument 115 | // So end the loop 116 | break; 117 | } 118 | } 119 | } 120 | 121 | return result; 122 | } 123 | else { 124 | // This isn't a quoted expression 125 | // So just return the rest of the argument 126 | return @(argv[keyIdx] + keyLen); 127 | } 128 | } 129 | -------------------------------------------------------------------------------- /screenshot.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hamzasood/pam_touchid/ec7b7bdc1285b3588fe083d5bb9ac5ab5137fda2/screenshot.png --------------------------------------------------------------------------------