Bug 2170559

Summary: Unable to use imported IMA key on self-signed RPM.
Product: Red Hat Enterprise Linux 9 Reporter: Brandon Clark <brclark>
Component: ima-evm-utilsAssignee: Coiby <coxu>
Status: NEW --- QA Contact: Linqing Lu <lilu>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 9.1CC: alanm, amike, brclark, casantos, dbohanno, denli, jwright, mkielian, mkolbas, rparrazo
Target Milestone: rc   
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Hardware: Unspecified   
OS: Unspecified   
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Description Brandon Clark 2023-02-16 17:37:47 UTC 
Description of problem:
When configuring IMA/EVM and importing a key to the IMA keyring, while the key can be successfully imported, said key is unable to be used with any self-signed RPM packages that has the key's respective certificate.

Version-Release number of selected component (if applicable):
libattr-2.5.1-3.el9.x86_64
attr-2.5.1-3.el9.x86_64
ima-evm-utils-1.4-4.el9.x86_64
keyutils-libs-1.6.3-1.el9.x86_64
keyutils-1.6.3-1.el9.x86_64

How reproducible:
Consistently

Steps to Reproduce:
1. Implement IMA/EVM via documentation (see Additional Info).
2. Create key and respective self-signed certificate.
3. Create RPM package and sign with certificate.
4. Import key to IMA keyring.
5. Attempt to install self-signed RPM.

Actual results:
Imported key is able to be utilized on it's respective self-signed RPM package.

Expected results:
Imported key is unable to be utilized on it's respective self-signed RPM package.

Additional info:
Documentation referenced is the following:

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/managing_monitoring_and_updating_the_kernel/enhancing-security-with-the-kernel-integrity-subsystem_managing-monitoring-and-updating-the-kernel#enabling-integrity-measurement-architecture-and-extended-verification-module_enhancing-security-with-the-kernel-integrity-subsystem
Comment 1 Joe Wright 2023-02-16 21:15:21 UTC 
The actual results and expected results are backwards. Expected is actual and vice versa
Comment 2 Coiby 2023-06-30 10:31:57 UTC 
Hi Brandon,

Sorry, somehow I didn't notice this bug until now.

Could you be provided the detailed steps to reproduce. I don't quite understand the bug as https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/managing_monitoring_and_updating_the_kernel/enhancing-security-with-the-kernel-integrity-subsystem_managing-monitoring-and-updating-the-kernel#enabling-integrity-measurement-architecture-and-extended-verification-module_enhancing-security-with-the-kernel-integrity-subsystem doesn't mention anything about self-signed certificate.
Comment 3 Joe Wright 2023-07-17 18:00:39 UTC 
The command 'evmctl import /path/to/certificate ${im_keyring_id}' fails.

The key is confirmed as enrolled using the command 'mokutil --list-enrolled'

The 'evmctl import $pubkey $keyring' command also isn't working. It keeps returning an error 126 (ENOKEY) when trying to import to the IMA keyring.

The failure occurs with or without secure boot enabled.


When running it through strace (attached strace.txt), we see that permission is denied when trying to import the key:

4901  1676043783.480671 write(2</dev/pts/0>, "Importing public key f055f363 from file /etc/keys/pubkey_ima.der into keyring 247926348\n", 88) = 88 <0.000010>
4901  1676043783.480709 add_key("asymmetric", NULL, "0\202\6U0\202\4=\240\3\2\1\2\2\t\0\341\274P\242\17\264nJ0\r\6\t*\206H\206\367\r\1\1\v\5\0000m1\0240\22\6\3U\4\3\f\vOwl IMA Key1\v0\t\6\3U\4\6\23\2US1\v0\t\6\3U\4\10\f\2CT1\0200\16\6\3U\4\7\f\7Danbury1)0'\6\3U\4\n\f Owl Cyber Defense Solutions, LLC0\36\27\r230111200356Z\27\r230210200356Z0m1\0240\22\6\3U\4\3\f\vOwl IMA Key1\v0\t\6\3U\4\6\23\2US1\v0\t\6\3U\4\10\f\2CT1\0200\16\6\3U\4\7\f\7Danbury1)0'\6\3U\4\n\f Owl Cyber Defense Solutions, LLC0\202\2\"0\r\6\t*\206H\206\367\r\1\1\1\5\0\3\202\2\17\0000\202\2\n\2\202\2\1\0\271d\223\2479v\263.y\224\255\344\7]\310q\303v\362\300\267\255c<gta!\324.L\341\26\232\231O\0\251\302\220r\371\200\355\212/\24e\233\375\203\237\302\313\34\265\367\274\201QD8\367\337\217'De\235\v/\347\346\264\233a\316\232\264\374\232W\303\16\356\254\vM:\30\337.:a\2155\340\366\2344\30\364\306G\273\350lM\1V\2301\33\372\331\241\224u\361\305\320\211\272W\204\24Y,W\304\366\355\253\27f\37F\243\32h\350\16<w\270\220\273\251A\262xQ\304%\216!!\205\265|\20\376\34\370)P\304/\216v\334T\235o\302h2\312o\340\243\237\306\272\320\362\326\202\365\210\263\2E\337\306H5\343P\223C^\3565\263|&\223\201\243\346<\323r|_\242.N\274\362\223\260\252\r\377\323\v\302\327~\257\255\\\2162\304\35\273\363~\224=\177QAN\212\n\23\321\362\300gU\215\202\372\375\32\r\237\214\376K`\36;\215\324&\306+)\5\245\37w,\227\212A\3-;-\10\301l\251\360\272\341\347\302\274\262X\344\3\247\301\242gZj\305\37v\3\0212?pV\351(\22\265$\30C\3117\234G\260!p\311\263[6c\273\342\"$6\271\202\337\377\300~#BR\223a9\273\264\6\220\311\3C\301\272\32\361&\337\27\317\255\37qwC\372k\351\212\r\227k\372\233\215V\222\270\362\362S\316\214\202\301\306D\317\215\177\276\273\34\326\354q\231*K\261\310^\301\31^\213\257\f\257\332b\226\275W\305\333N\37\303'\222\26692\240\6\f\252\324<\271\3011UY\221\207\214<F\331dF\246\302\273\0D\311\245=\221\204\241\6\255\343\2275\262Qsw\222PW\340\232(un\16a,\250\f>\3\211F\225Z\314VV\324#\262<\340\366t\33\210nW\313\f\254\3770JD\326d\261\2\3\1\0\1\243\201\3670\201\3640\35\6\3U\35\16\4\26\4\24o\243\205\36\230\377\324\35\323\317\323uS\4=\320\360U\363c0\201\237\6\3U\35#\4\201\2270\201\224\200\24o\243\205\36\230\377\324\35\323\317\323uS\4=\320\360U\363c\241q\244o0m1\0240\22\6\3U\4\3\f\vOwl IMA Key1\v0\t\6\3U\4\6\23\2US1\v0\t\6\3U\4\10\f\2CT1\0200\16\6\3U\4\7\f\7Danbury1)0'\6\3U\4\n\f Owl Cyber Defense Solutions, LLC\202\t\0\341\274P\242\17\264nJ0\t\6\3U\35\23\4\0020\0000\16\6\3U\35\17\1\1\377\4\4\3\2\7\2000\26\6\3U\35%\1\1\377\4\f0\n\6\10+\6\1\5\5\7\3\0030\r\6\t*\206H\206\367\r\1\1\v\5\0\3\202\2\1\0\7\177\363F\272\244\242\352\240\300\261\0\313\351,\361\225\361\267\376G\2010b\321\3234=\21\371\25\332B\275E\36-\27\3528\32371\335\314L\313F\303\vW[\344.\366s\334\301t\206\26A\235\325\277\376\31\20/1\2728\204\33\313\346\214\342\253\364\313O\256/3\323G\376\352`\36\342\360\17\303\256\320\224\2116\t\36(\276Q\356\365v_5\346\323>\223\211A\6I\234#e\377)-\264\346{\371jw\331\207s\365\374\2134\351D[e\202\36\375#\334\267T\225%\210\203\7\232\373\340t\252\264M\265$\36\32qv\224=j\305\306T\1HM\367\275=\323\202\305\230F\2\26*}i1\2166AD\49T\246T\364\367\322'\235\326\31\323\217\346\226\245\371\344\301^\21Mks\234R\320kg\356W]u\201\373G\251\312\250.\311\266\333\31I\316\332\374\371\216\244z\261j\212c\342\206\253\34\233\374\377\10\304^g\363\365i\"\306\10FU)\20\6\264\244M-\340\361a\251`\344\342\311\17\220\244\266/4#\317x\241\267,3[X\262\242\v\204[L\277\311<\327\235\347\205\356\205\0\331\227]\341\254G\345\257\260\206\334\207\32\f?QXN\361\244v\354\2757\367eANk\256\276\365\217G6\20\36\334m\364\2739Cs\31\225\343\376L\3N\265\225\26\236\270\315\3776\344\255SQC\374\2678E\332\330\274M\0\303\357A\373\371\6::\253}\336\27|\237\340\275\79\0234S\335U\302j\215h)\0[\1<6LF\322\rJ<\200T\2323\213\242\315\335`i\215i#}0\256\302\267Y\24\0\330\373\311\306\251\36\313,eyk\313@\306N\364\216\341\220\240\320g\257u8>\251\223\6* \241Kv\16\234\360\16\253\326\1i;\"\247\3\27\206\232a\265F-`\244Z}\20S-u\316mP", 1625, 247926348) = -1 EACCES (Permission denied) <0.000012>
4901  1676043783.480766 write(2</dev/pts/0>, "add_key failed\n", 15) = 15 <0.000007>
4901  1676043783.480801 write(2</dev/pts/0>, "errno: Permission denied (13)\n", 30) = 30 <0.000007>

There is no STIG/SCAP or other similar hardening applied to the environment.
Comment 5 Coiby 2023-07-18 11:24:59 UTC 
(In reply to Joe Wright from comment #3)
> The command 'evmctl import /path/to/certificate ${im_keyring_id}' fails.
> 
> The key is confirmed as enrolled using the command 'mokutil --list-enrolled'
> 
> The 'evmctl import $pubkey $keyring' command also isn't working. It keeps
> returning an error 126 (ENOKEY) when trying to import to the IMA keyring.
> 
> The failure occurs with or without secure boot enabled.
> 
> 
> When running it through strace (attached strace.txt), we see that permission
> is denied when trying to import the key:
> 
> 4901  1676043783.480671 write(2</dev/pts/0>, "Importing public key f055f363
> from file /etc/keys/pubkey_ima.der into keyring 247926348\n", 88) = 88
> <0.000010>
> 4901  1676043783.480709 add_key("asymmetric", NULL,
> "0\202\6U0\202\4=\240\3\2\1\2\2\t\0\341\274P\242\17\264nJ0\r\6\t*\206H\206\36
> 7\r\1\1\v\5\0000m1\0240\22\6\3U\4\3\f\vOwl IMA
> Key1\v0\t\6\3U\4\6\23\2US1\v0\t\6\3U\4\10\f\2CT1\0200\16\6\3U\4\7\f\7Danbury1
> )0'\6\3U\4\n\f Owl Cyber Defense Solutions,
> LLC0\36\27\r230111200356Z\27\r230210200356Z0m1\0240\22\6\3U\4\3\f\vOwl IMA
> Key1\v0\t\6\3U\4\6\23\2US1\v0\t\6\3U\4\10\f\2CT1\0200\16\6\3U\4\7\f\7Danbury1
> )0'\6\3U\4\n\f Owl Cyber Defense Solutions,
> LLC0\202\2\"0\r\6\t*\206H\206\367\r\1\1\1\5\0\3\202\2\17\0000\202\2\n\2\202\2
> \1\0\271d\223\2479v\263.y\224\255\344\7]\310q\303v\362\300\267\255c<gta!\324.
> L\341\26\232\231O\0\251\302\220r\371\200\355\212/
> \24e\233\375\203\237\302\313\34\265\367\274\201QD8\367\337\217'De\235\v/
> \347\346\264\233a\316\232\264\374\232W\303\16\356\254\vM:\30\337.:
> a\2155\340\366\2344\30\364\306G\273\350lM\1V\2301\33\372\331\241\224u\361\305
> \320\211\272W\204\24Y,
> W\304\366\355\253\27f\37F\243\32h\350\16<w\270\220\273\251A\262xQ\304%\216!!
> \205\265|\20\376\34\370)P\304/
> \216v\334T\235o\302h2\312o\340\243\237\306\272\320\362\326\202\365\210\263\2E
> \337\306H5\343P\223C^\3565\263|&\223\201\243\346<\323r|_\242.
> N\274\362\223\260\252\r\377\323\v\302\327~\257\255\\\2162\304\35\273\363~\224
> =\177QAN\212\n\23\321\362\300gU\215\202\372\375\32\r\237\214\376K`\36;
> \215\324&\306+)\5\245\37w,\227\212A\3-;-
> \10\301l\251\360\272\341\347\302\274\262X\344\3\247\301\242gZj\305\37v\3\0212
> ?pV\351(\22\265$\30C\3117\234G\260!
> p\311\263[6c\273\342\"$6\271\202\337\377\300~#BR\223a9\273\264\6\220\311\3C\3
> 01\272\32\361&\337\27\317\255\37qwC\372k\351\212\r\227k\372\233\215V\222\270\
> 362\362S\316\214\202\301\306D\317\215\177\276\273\34\326\354q\231*K\261\310^\
> 301\31^\213\257\f\257\332b\226\275W\305\333N\37\303'\222\26692\240\6\f\252\32
> 4<\271\3011UY\221\207\214<F\331dF\246\302\273\0D\311\245=\221\204\241\6\255\3
> 43\2275\262Qsw\222PW\340\232(un\16a,
> \250\f>\3\211F\225Z\314VV\324#\262<\340\366t\33\210nW\313\f\254\3770JD\326d\2
> 61\2\3\1\0\1\243\201\3670\201\3640\35\6\3U\35\16\4\26\4\24o\243\205\36\230\37
> 7\324\35\323\317\323uS\4=\320\360U\363c0\201\237\6\3U\35#\4\201\2270\201\224\
> 200\24o\243\205\36\230\377\324\35\323\317\323uS\4=\320\360U\363c\241q\244o0m1
> \0240\22\6\3U\4\3\f\vOwl IMA
> Key1\v0\t\6\3U\4\6\23\2US1\v0\t\6\3U\4\10\f\2CT1\0200\16\6\3U\4\7\f\7Danbury1
> )0'\6\3U\4\n\f Owl Cyber Defense Solutions,
> LLC\202\t\0\341\274P\242\17\264nJ0\t\6\3U\35\23\4\0020\0000\16\6\3U\35\17\1\1
> \377\4\4\3\2\7\2000\26\6\3U\35%\1\1\377\4\f0\n\6\10+\6\1\5\5\7\3\0030\r\6\t*\
> 206H\206\367\r\1\1\v\5\0\3\202\2\1\0\7\177\363F\272\244\242\352\240\300\261\0
> \313\351,\361\225\361\267\376G\2010b\321\3234=\21\371\25\332B\275E\36-
> \27\3528\32371\335\314L\313F\303\vW[\344.
> \366s\334\301t\206\26A\235\325\277\376\31\20/
> 1\2728\204\33\313\346\214\342\253\364\313O\256/
> 3\323G\376\352`\36\342\360\17\303\256\320\224\2116\t\36(\276Q\356\365v_5\346\
> 323>\223\211A\6I\234#e\377)-
> \264\346{\371jw\331\207s\365\374\2134\351D[e\202\36\375#\334\267T\225%\210\20
> 3\7\232\373\340t\252\264M\265$\36\32qv\224=j\305\306T\1HM\367\275=\323\202\30
> 5\230F\2\26*}i1\2166AD\49T\246T\364\367\322'\235\326\31\323\217\346\226\245\3
> 71\344\301^\21Mks\234R\320kg\356W]u\201\373G\251\312\250.
> \311\266\333\31I\316\332\374\371\216\244z\261j\212c\342\206\253\34\233\374\37
> 7\10\304^g\363\365i\"\306\10FU)\20\6\264\244M-
> \340\361a\251`\344\342\311\17\220\244\266/4#\317x\241\267,
> 3[X\262\242\v\204[L\277\311<\327\235\347\205\356\205\0\331\227]\341\254G\345\
> 257\260\206\334\207\32\f?QXN\361\244v\354\2757\367eANk\256\276\365\217G6\20\3
> 6\334m\364\2739Cs\31\225\343\376L\3N\265\225\26\236\270\315\3776\344\255SQC\3
> 74\2678E\332\330\274M\0\303\357A\373\371\6::
> \253}\336\27|\237\340\275\79\0234S\335U\302j\215h)\0[\1<6LF\322\rJ<\200T\2323
> \213\242\315\335`i\215i#}0\256\302\267Y\24\0\330\373\311\306\251\36\313,
> eyk\313@\306N\364\216\341\220\240\320g\257u8>\251\223\6*
> \241Kv\16\234\360\16\253\326\1i;\"\247\3\27\206\232a\265F-`\244Z}\20S-
> u\316mP", 1625, 247926348) = -1 EACCES (Permission denied) <0.000012>
> 4901  1676043783.480766 write(2</dev/pts/0>, "add_key failed\n", 15) = 15
> <0.000007>
> 4901  1676043783.480801 write(2</dev/pts/0>, "errno: Permission denied
> (13)\n", 30) = 30 <0.000007>
> 
> There is no STIG/SCAP or other similar hardening applied to the environment.


By "${im_keyring_id}", do you mean the %:.ima keyring? If the answer is yes, in order to add this key to the .ima keyring, this key needs to be signed by a CA key/certificate in the .builtin_trusted_keys or .secondary_trusted_keys (the latter is supported since kernel-5.14.0-337.el9.x86_64) keyrings. You can follow "Generate trusted keys" [1] to create a CA key and sign the IMA key.

[1] https://github.com/mimizohar/ima-evm-utils/blob/next-testing/README#L274
Comment 6 Brandon Clark 2023-08-17 17:37:29 UTC 
Hello,

Is there a specific set of steps needed for importing the keys to the secondary_trusted_keys?