| Message ID | 20231022194026.313584-1-dimitri.ledkov@canonical.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | apparmor: switch SECURITY_APPARMOR_HASH from sha1 to sha256 | expand |
On 10/22/23 12:40, Dimitri John Ledkov wrote: > sha1 is insecure and has colisions, thus it is not useful for even > lightweight policy hash checks. Switch to sha256, which on modern > hardware is fast enough. > > Separately as per NIST Policy on Hash Functions, sha1 usage must be > withdrawn by 2030. This config option currently is one of many that > holds up sha1 usage. > > Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com> Acked-by: John Johansen <john.johansen@canonical.com> I am pulling this into apparmor-next-queue and plan to drop this into apparmor-next as soon as 6.7-r1 is released. > --- > security/apparmor/Kconfig | 12 ++++++------ > security/apparmor/apparmorfs.c | 16 ++++++++-------- > security/apparmor/crypto.c | 6 +++--- > 3 files changed, 17 insertions(+), 17 deletions(-) > > diff --git a/security/apparmor/Kconfig b/security/apparmor/Kconfig > index e0d1dd0a19..64cc3044a4 100644 > --- a/security/apparmor/Kconfig > +++ b/security/apparmor/Kconfig > @@ -57,10 +57,10 @@ config SECURITY_APPARMOR_INTROSPECT_POLICY > cpu is paramount. > > config SECURITY_APPARMOR_HASH > - bool "Enable introspection of sha1 hashes for loaded profiles" > + bool "Enable introspection of sha256 hashes for loaded profiles" > depends on SECURITY_APPARMOR_INTROSPECT_POLICY > select CRYPTO > - select CRYPTO_SHA1 > + select CRYPTO_SHA256 > default y > help > This option selects whether introspection of loaded policy > @@ -74,10 +74,10 @@ config SECURITY_APPARMOR_HASH_DEFAULT > depends on SECURITY_APPARMOR_HASH > default y > help > - This option selects whether sha1 hashing of loaded policy > - is enabled by default. The generation of sha1 hashes for > - loaded policy provide system administrators a quick way > - to verify that policy in the kernel matches what is expected, > + This option selects whether sha256 hashing of loaded policy > + is enabled by default. The generation of sha256 hashes for > + loaded policy provide system administrators a quick way to > + verify that policy in the kernel matches what is expected, > however it can slow down policy load on some devices. In > these cases policy hashing can be disabled by default and > enabled only if needed. > diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c > index a608a6bd76..082581397d 100644 > --- a/security/apparmor/apparmorfs.c > +++ b/security/apparmor/apparmorfs.c > @@ -1474,7 +1474,7 @@ int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata) > rawdata->dents[AAFS_LOADDATA_REVISION] = dent; > > if (aa_g_hash_policy) { > - dent = aafs_create_file("sha1", S_IFREG | 0444, dir, > + dent = aafs_create_file("sha256", S_IFREG | 0444, dir, > rawdata, &seq_rawdata_hash_fops); > if (IS_ERR(dent)) > goto fail; > @@ -1644,11 +1644,11 @@ static const char *rawdata_get_link_base(struct dentry *dentry, > return target; > } > > -static const char *rawdata_get_link_sha1(struct dentry *dentry, > +static const char *rawdata_get_link_sha256(struct dentry *dentry, > struct inode *inode, > struct delayed_call *done) > { > - return rawdata_get_link_base(dentry, inode, done, "sha1"); > + return rawdata_get_link_base(dentry, inode, done, "sha256"); > } > > static const char *rawdata_get_link_abi(struct dentry *dentry, > @@ -1665,8 +1665,8 @@ static const char *rawdata_get_link_data(struct dentry *dentry, > return rawdata_get_link_base(dentry, inode, done, "raw_data"); > } > > -static const struct inode_operations rawdata_link_sha1_iops = { > - .get_link = rawdata_get_link_sha1, > +static const struct inode_operations rawdata_link_sha256_iops = { > + .get_link = rawdata_get_link_sha256, > }; > > static const struct inode_operations rawdata_link_abi_iops = { > @@ -1739,7 +1739,7 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) > profile->dents[AAFS_PROF_ATTACH] = dent; > > if (profile->hash) { > - dent = create_profile_file(dir, "sha1", profile, > + dent = create_profile_file(dir, "sha256", profile, > &seq_profile_hash_fops); > if (IS_ERR(dent)) > goto fail; > @@ -1749,9 +1749,9 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) > #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY > if (profile->rawdata) { > if (aa_g_hash_policy) { > - dent = aafs_create("raw_sha1", S_IFLNK | 0444, dir, > + dent = aafs_create("raw_sha256", S_IFLNK | 0444, dir, > profile->label.proxy, NULL, NULL, > - &rawdata_link_sha1_iops); > + &rawdata_link_sha256_iops); > if (IS_ERR(dent)) > goto fail; > aa_get_proxy(profile->label.proxy); > diff --git a/security/apparmor/crypto.c b/security/apparmor/crypto.c > index 6724e2ff6d..aad486b2fc 100644 > --- a/security/apparmor/crypto.c > +++ b/security/apparmor/crypto.c > @@ -106,16 +106,16 @@ static int __init init_profile_hash(void) > if (!apparmor_initialized) > return 0; > > - tfm = crypto_alloc_shash("sha1", 0, 0); > + tfm = crypto_alloc_shash("sha256", 0, 0); > if (IS_ERR(tfm)) { > int error = PTR_ERR(tfm); > - AA_ERROR("failed to setup profile sha1 hashing: %d\n", error); > + AA_ERROR("failed to setup profile sha256 hashing: %d\n", error); > return error; > } > apparmor_tfm = tfm; > apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm); > > - aa_info_message("AppArmor sha1 policy hashing enabled"); > + aa_info_message("AppArmor sha256 policy hashing enabled"); > > return 0; > }
diff --git a/security/apparmor/Kconfig b/security/apparmor/Kconfig index e0d1dd0a19..64cc3044a4 100644 --- a/security/apparmor/Kconfig +++ b/security/apparmor/Kconfig @@ -57,10 +57,10 @@ config SECURITY_APPARMOR_INTROSPECT_POLICY cpu is paramount. config SECURITY_APPARMOR_HASH - bool "Enable introspection of sha1 hashes for loaded profiles" + bool "Enable introspection of sha256 hashes for loaded profiles" depends on SECURITY_APPARMOR_INTROSPECT_POLICY select CRYPTO - select CRYPTO_SHA1 + select CRYPTO_SHA256 default y help This option selects whether introspection of loaded policy @@ -74,10 +74,10 @@ config SECURITY_APPARMOR_HASH_DEFAULT depends on SECURITY_APPARMOR_HASH default y help - This option selects whether sha1 hashing of loaded policy - is enabled by default. The generation of sha1 hashes for - loaded policy provide system administrators a quick way - to verify that policy in the kernel matches what is expected, + This option selects whether sha256 hashing of loaded policy + is enabled by default. The generation of sha256 hashes for + loaded policy provide system administrators a quick way to + verify that policy in the kernel matches what is expected, however it can slow down policy load on some devices. In these cases policy hashing can be disabled by default and enabled only if needed. diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c index a608a6bd76..082581397d 100644 --- a/security/apparmor/apparmorfs.c +++ b/security/apparmor/apparmorfs.c @@ -1474,7 +1474,7 @@ int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata) rawdata->dents[AAFS_LOADDATA_REVISION] = dent; if (aa_g_hash_policy) { - dent = aafs_create_file("sha1", S_IFREG | 0444, dir, + dent = aafs_create_file("sha256", S_IFREG | 0444, dir, rawdata, &seq_rawdata_hash_fops); if (IS_ERR(dent)) goto fail; @@ -1644,11 +1644,11 @@ static const char *rawdata_get_link_base(struct dentry *dentry, return target; } -static const char *rawdata_get_link_sha1(struct dentry *dentry, +static const char *rawdata_get_link_sha256(struct dentry *dentry, struct inode *inode, struct delayed_call *done) { - return rawdata_get_link_base(dentry, inode, done, "sha1"); + return rawdata_get_link_base(dentry, inode, done, "sha256"); } static const char *rawdata_get_link_abi(struct dentry *dentry, @@ -1665,8 +1665,8 @@ static const char *rawdata_get_link_data(struct dentry *dentry, return rawdata_get_link_base(dentry, inode, done, "raw_data"); } -static const struct inode_operations rawdata_link_sha1_iops = { - .get_link = rawdata_get_link_sha1, +static const struct inode_operations rawdata_link_sha256_iops = { + .get_link = rawdata_get_link_sha256, }; static const struct inode_operations rawdata_link_abi_iops = { @@ -1739,7 +1739,7 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) profile->dents[AAFS_PROF_ATTACH] = dent; if (profile->hash) { - dent = create_profile_file(dir, "sha1", profile, + dent = create_profile_file(dir, "sha256", profile, &seq_profile_hash_fops); if (IS_ERR(dent)) goto fail; @@ -1749,9 +1749,9 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY if (profile->rawdata) { if (aa_g_hash_policy) { - dent = aafs_create("raw_sha1", S_IFLNK | 0444, dir, + dent = aafs_create("raw_sha256", S_IFLNK | 0444, dir, profile->label.proxy, NULL, NULL, - &rawdata_link_sha1_iops); + &rawdata_link_sha256_iops); if (IS_ERR(dent)) goto fail; aa_get_proxy(profile->label.proxy); diff --git a/security/apparmor/crypto.c b/security/apparmor/crypto.c index 6724e2ff6d..aad486b2fc 100644 --- a/security/apparmor/crypto.c +++ b/security/apparmor/crypto.c @@ -106,16 +106,16 @@ static int __init init_profile_hash(void) if (!apparmor_initialized) return 0; - tfm = crypto_alloc_shash("sha1", 0, 0); + tfm = crypto_alloc_shash("sha256", 0, 0); if (IS_ERR(tfm)) { int error = PTR_ERR(tfm); - AA_ERROR("failed to setup profile sha1 hashing: %d\n", error); + AA_ERROR("failed to setup profile sha256 hashing: %d\n", error); return error; } apparmor_tfm = tfm; apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm); - aa_info_message("AppArmor sha1 policy hashing enabled"); + aa_info_message("AppArmor sha256 policy hashing enabled"); return 0; }
sha1 is insecure and has colisions, thus it is not useful for even lightweight policy hash checks. Switch to sha256, which on modern hardware is fast enough. Separately as per NIST Policy on Hash Functions, sha1 usage must be withdrawn by 2030. This config option currently is one of many that holds up sha1 usage. Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com> --- security/apparmor/Kconfig | 12 ++++++------ security/apparmor/apparmorfs.c | 16 ++++++++-------- security/apparmor/crypto.c | 6 +++--- 3 files changed, 17 insertions(+), 17 deletions(-)