diff options
Diffstat (limited to 'security/apparmor')
| -rw-r--r-- | security/apparmor/Makefile | 27 | ||||
| -rw-r--r-- | security/apparmor/apparmorfs.c | 195 | ||||
| -rw-r--r-- | security/apparmor/audit.c | 7 | ||||
| -rw-r--r-- | security/apparmor/domain.c | 5 | ||||
| -rw-r--r-- | security/apparmor/file.c | 21 | ||||
| -rw-r--r-- | security/apparmor/include/apparmor.h | 15 | ||||
| -rw-r--r-- | security/apparmor/include/apparmorfs.h | 44 | ||||
| -rw-r--r-- | security/apparmor/include/audit.h | 9 | ||||
| -rw-r--r-- | security/apparmor/include/file.h | 2 | ||||
| -rw-r--r-- | security/apparmor/include/match.h | 3 | ||||
| -rw-r--r-- | security/apparmor/include/path.h | 3 | ||||
| -rw-r--r-- | security/apparmor/include/policy.h | 15 | ||||
| -rw-r--r-- | security/apparmor/include/resource.h | 4 | ||||
| -rw-r--r-- | security/apparmor/match.c | 80 | ||||
| -rw-r--r-- | security/apparmor/path.c | 56 | ||||
| -rw-r--r-- | security/apparmor/policy.c | 3 | ||||
| -rw-r--r-- | security/apparmor/policy_unpack.c | 31 | ||||
| -rw-r--r-- | security/apparmor/resource.c | 5 |
18 files changed, 419 insertions, 106 deletions
diff --git a/security/apparmor/Makefile b/security/apparmor/Makefile index 2dafe50a2e2..806bd19af7f 100644 --- a/security/apparmor/Makefile +++ b/security/apparmor/Makefile @@ -15,7 +15,7 @@ clean-files := capability_names.h rlim_names.h # to # [1] = "dac_override", quiet_cmd_make-caps = GEN $@ -cmd_make-caps = echo "static const char *capability_names[] = {" > $@ ;\ +cmd_make-caps = echo "static const char *const capability_names[] = {" > $@ ;\ sed $< >>$@ -r -n -e '/CAP_FS_MASK/d' \ -e 's/^\#define[ \t]+CAP_([A-Z0-9_]+)[ \t]+([0-9]+)/[\2] = "\L\1",/p';\ echo "};" >> $@ @@ -28,25 +28,38 @@ cmd_make-caps = echo "static const char *capability_names[] = {" > $@ ;\ # [RLIMIT_STACK] = "stack", # # and build a second integer table (with the second sed cmd), that maps -# RLIMIT defines to the order defined in asm-generic/resource.h Thi is +# RLIMIT defines to the order defined in asm-generic/resource.h This is # required by policy load to map policy ordering of RLIMITs to internal # ordering for architectures that redefine an RLIMIT. # Transforms lines from # #define RLIMIT_STACK 3 /* max stack size */ # to # RLIMIT_STACK, +# +# and build the securityfs entries for the mapping. +# Transforms lines from +# #define RLIMIT_FSIZE 1 /* Maximum filesize */ +# #define RLIMIT_STACK 3 /* max stack size */ +# to +# #define AA_FS_RLIMIT_MASK "fsize stack" quiet_cmd_make-rlim = GEN $@ -cmd_make-rlim = echo "static const char *rlim_names[] = {" > $@ ;\ +cmd_make-rlim = echo "static const char *const rlim_names[RLIM_NLIMITS] = {" \ + > $@ ;\ sed $< >> $@ -r -n \ -e 's/^\# ?define[ \t]+(RLIMIT_([A-Z0-9_]+)).*/[\1] = "\L\2",/p';\ echo "};" >> $@ ;\ - echo "static const int rlim_map[] = {" >> $@ ;\ + echo "static const int rlim_map[RLIM_NLIMITS] = {" >> $@ ;\ sed -r -n "s/^\# ?define[ \t]+(RLIMIT_[A-Z0-9_]+).*/\1,/p" $< >> $@ ;\ - echo "};" >> $@ + echo "};" >> $@ ; \ + echo -n '\#define AA_FS_RLIMIT_MASK "' >> $@ ;\ + sed -r -n 's/^\# ?define[ \t]+RLIMIT_([A-Z0-9_]+).*/\L\1/p' $< | \ + tr '\n' ' ' | sed -e 's/ $$/"\n/' >> $@ $(obj)/capability.o : $(obj)/capability_names.h $(obj)/resource.o : $(obj)/rlim_names.h -$(obj)/capability_names.h : $(srctree)/include/linux/capability.h +$(obj)/capability_names.h : $(srctree)/include/linux/capability.h \ + $(src)/Makefile $(call cmd,make-caps) -$(obj)/rlim_names.h : $(srctree)/include/asm-generic/resource.h +$(obj)/rlim_names.h : $(srctree)/include/asm-generic/resource.h \ + $(src)/Makefile $(call cmd,make-rlim) diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c index e39df6d4377..16c15ec6f67 100644 --- a/security/apparmor/apparmorfs.c +++ b/security/apparmor/apparmorfs.c @@ -18,12 +18,14 @@ #include <linux/seq_file.h> #include <linux/uaccess.h> #include <linux/namei.h> +#include <linux/capability.h> #include "include/apparmor.h" #include "include/apparmorfs.h" #include "include/audit.h" #include "include/context.h" #include "include/policy.h" +#include "include/resource.h" /** * aa_simple_write_to_buffer - common routine for getting policy from user @@ -142,38 +144,166 @@ static const struct file_operations aa_fs_profile_remove = { .llseek = default_llseek, }; -/** Base file system setup **/ +static int aa_fs_seq_show(struct seq_file *seq, void *v) +{ + struct aa_fs_entry *fs_file = seq->private; + + if (!fs_file) + return 0; -static struct dentry *aa_fs_dentry __initdata; + switch (fs_file->v_type) { + case AA_FS_TYPE_BOOLEAN: + seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no"); + break; + case AA_FS_TYPE_STRING: + seq_printf(seq, "%s\n", fs_file->v.string); + break; + case AA_FS_TYPE_U64: + seq_printf(seq, "%#08lx\n", fs_file->v.u64); + break; + default: + /* Ignore unpritable entry types. */ + break; + } + + return 0; +} -static void __init aafs_remove(const char *name) +static int aa_fs_seq_open(struct inode *inode, struct file *file) { - struct dentry *dentry; + return single_open(file, aa_fs_seq_show, inode->i_private); +} + +const struct file_operations aa_fs_seq_file_ops = { + .owner = THIS_MODULE, + .open = aa_fs_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +/** Base file system setup **/ + +static struct aa_fs_entry aa_fs_entry_file[] = { + AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \ + "link lock"), + { } +}; - dentry = lookup_one_len(name, aa_fs_dentry, strlen(name)); - if (!IS_ERR(dentry)) { - securityfs_remove(dentry); - dput(dentry); +static struct aa_fs_entry aa_fs_entry_domain[] = { + AA_FS_FILE_BOOLEAN("change_hat", 1), + AA_FS_FILE_BOOLEAN("change_hatv", 1), + AA_FS_FILE_BOOLEAN("change_onexec", 1), + AA_FS_FILE_BOOLEAN("change_profile", 1), + { } +}; + +static struct aa_fs_entry aa_fs_entry_features[] = { + AA_FS_DIR("domain", aa_fs_entry_domain), + AA_FS_DIR("file", aa_fs_entry_file), + AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), + AA_FS_DIR("rlimit", aa_fs_entry_rlimit), + { } +}; + +static struct aa_fs_entry aa_fs_entry_apparmor[] = { + AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load), + AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace), + AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove), + AA_FS_DIR("features", aa_fs_entry_features), + { } +}; + +static struct aa_fs_entry aa_fs_entry = + AA_FS_DIR("apparmor", aa_fs_entry_apparmor); + +/** + * aafs_create_file - create a file entry in the apparmor securityfs + * @fs_file: aa_fs_entry to build an entry for (NOT NULL) + * @parent: the parent dentry in the securityfs + * + * Use aafs_remove_file to remove entries created with this fn. + */ +static int __init aafs_create_file(struct aa_fs_entry *fs_file, + struct dentry *parent) +{ + int error = 0; + + fs_file->dentry = securityfs_create_file(fs_file->name, + S_IFREG | fs_file->mode, + parent, fs_file, + fs_file->file_ops); + if (IS_ERR(fs_file->dentry)) { + error = PTR_ERR(fs_file->dentry); + fs_file->dentry = NULL; } + return error; } /** - * aafs_create - create an entry in the apparmor filesystem - * @name: name of the entry (NOT NULL) - * @mask: file permission mask of the file - * @fops: file operations for the file (NOT NULL) + * aafs_create_dir - recursively create a directory entry in the securityfs + * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL) + * @parent: the parent dentry in the securityfs * - * Used aafs_remove to remove entries created with this fn. + * Use aafs_remove_dir to remove entries created with this fn. */ -static int __init aafs_create(const char *name, umode_t mask, - const struct file_operations *fops) +static int __init aafs_create_dir(struct aa_fs_entry *fs_dir, + struct dentry *parent) { - struct dentry *dentry; + int error; + struct aa_fs_entry *fs_file; - dentry = securityfs_create_file(name, S_IFREG | mask, aa_fs_dentry, - NULL, fops); + fs_dir->dentry = securityfs_create_dir(fs_dir->name, parent); + if (IS_ERR(fs_dir->dentry)) { + error = PTR_ERR(fs_dir->dentry); + fs_dir->dentry = NULL; + goto failed; + } - return IS_ERR(dentry) ? PTR_ERR(dentry) : 0; + for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) { + if (fs_file->v_type == AA_FS_TYPE_DIR) + error = aafs_create_dir(fs_file, fs_dir->dentry); + else + error = aafs_create_file(fs_file, fs_dir->dentry); + if (error) + goto failed; + } + + return 0; + +failed: + return error; +} + +/** + * aafs_remove_file - drop a single file entry in the apparmor securityfs + * @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL) + */ +static void __init aafs_remove_file(struct aa_fs_entry *fs_file) +{ + if (!fs_file->dentry) + return; + + securityfs_remove(fs_file->dentry); + fs_file->dentry = NULL; +} + +/** + * aafs_remove_dir - recursively drop a directory entry from the securityfs + * @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL) + */ +static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir) +{ + struct aa_fs_entry *fs_file; + + for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) { + if (fs_file->v_type == AA_FS_TYPE_DIR) + aafs_remove_dir(fs_file); + else + aafs_remove_file(fs_file); + } + + aafs_remove_file(fs_dir); } /** @@ -183,14 +313,7 @@ static int __init aafs_create(const char *name, umode_t mask, */ void __init aa_destroy_aafs(void) { - if (aa_fs_dentry) { - aafs_remove(".remove"); - aafs_remove(".replace"); - aafs_remove(".load"); - - securityfs_remove(aa_fs_dentry); - aa_fs_dentry = NULL; - } + aafs_remove_dir(&aa_fs_entry); } /** @@ -207,25 +330,13 @@ static int __init aa_create_aafs(void) if (!apparmor_initialized) return 0; - if (aa_fs_dentry) { + if (aa_fs_entry.dentry) { AA_ERROR("%s: AppArmor securityfs already exists\n", __func__); return -EEXIST; } - aa_fs_dentry = securityfs_create_dir("apparmor", NULL); - if (IS_ERR(aa_fs_dentry)) { - error = PTR_ERR(aa_fs_dentry); - aa_fs_dentry = NULL; - goto error; - } - - error = aafs_create(".load", 0640, &aa_fs_profile_load); - if (error) - goto error; - error = aafs_create(".replace", 0640, &aa_fs_profile_replace); - if (error) - goto error; - error = aafs_create(".remove", 0640, &aa_fs_profile_remove); + /* Populate fs tree. */ + error = aafs_create_dir(&aa_fs_entry, NULL); if (error) goto error; diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c index f3fafedd798..5ff67776a5a 100644 --- a/security/apparmor/audit.c +++ b/security/apparmor/audit.c @@ -19,7 +19,7 @@ #include "include/audit.h" #include "include/policy.h" -const char *op_table[] = { +const char *const op_table[] = { "null", "sysctl", @@ -73,7 +73,7 @@ const char *op_table[] = { "profile_remove" }; -const char *audit_mode_names[] = { +const char *const audit_mode_names[] = { "normal", "quiet_denied", "quiet", @@ -81,7 +81,7 @@ const char *audit_mode_names[] = { "all" }; -static char *aa_audit_type[] = { +static const char *const aa_audit_type[] = { "AUDIT", "ALLOWED", "DENIED", @@ -89,6 +89,7 @@ static char *aa_audit_type[] = { "STATUS", "ERROR", "KILLED" + "AUTO" }; /* diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c index c1e18ba5bdc..7c69599a69e 100644 --- a/security/apparmor/domain.c +++ b/security/apparmor/domain.c @@ -372,13 +372,12 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm) state = profile->file.start; /* buffer freed below, name is pointer into buffer */ - error = aa_get_name(&bprm->file->f_path, profile->path_flags, &buffer, - &name); + error = aa_path_name(&bprm->file->f_path, profile->path_flags, &buffer, + &name, &info); if (error) { if (profile->flags & (PFLAG_IX_ON_NAME_ERROR | PFLAG_UNCONFINED)) error = 0; - info = "Exec failed name resolution"; name = bprm->filename; goto audit; } diff --git a/security/apparmor/file.c b/security/apparmor/file.c index 7312db74121..3022c0f4f0d 100644 --- a/security/apparmor/file.c +++ b/security/apparmor/file.c @@ -173,8 +173,6 @@ static u32 map_old_perms(u32 old) if (old & 0x40) /* AA_EXEC_MMAP */ new |= AA_EXEC_MMAP; - new |= AA_MAY_META_READ; - return new; } @@ -212,6 +210,7 @@ static struct file_perms compute_perms(struct aa_dfa *dfa, unsigned int state, perms.quiet = map_old_perms(dfa_other_quiet(dfa, state)); perms.xindex = dfa_other_xindex(dfa, state); } + perms.allow |= AA_MAY_META_READ; /* change_profile wasn't determined by ownership in old mapping */ if (ACCEPT_TABLE(dfa)[state] & 0x80000000) @@ -279,22 +278,16 @@ int aa_path_perm(int op, struct aa_profile *profile, struct path *path, int error; flags |= profile->path_flags | (S_ISDIR(cond->mode) ? PATH_IS_DIR : 0); - error = aa_get_name(path, flags, &buffer, &name); + error = aa_path_name(path, flags, &buffer, &name, &info); if (error) { if (error == -ENOENT && is_deleted(path->dentry)) { /* Access to open files that are deleted are * give a pass (implicit delegation) */ error = 0; + info = NULL; perms.allow = request; - } else if (error == -ENOENT) - info = "Failed name lookup - deleted entry"; - else if (error == -ESTALE) - info = "Failed name lookup - disconnected path"; - else if (error == -ENAMETOOLONG) - info = "Failed name lookup - name too long"; - else - info = "Failed name lookup"; + } } else { aa_str_perms(profile->file.dfa, profile->file.start, name, cond, &perms); @@ -365,12 +358,14 @@ int aa_path_link(struct aa_profile *profile, struct dentry *old_dentry, lperms = nullperms; /* buffer freed below, lname is pointer in buffer */ - error = aa_get_name(&link, profile->path_flags, &buffer, &lname); + error = aa_path_name(&link, profile->path_flags, &buffer, &lname, + &info); if (error) goto audit; /* buffer2 freed below, tname is pointer in buffer2 */ - error = aa_get_name(&target, profile->path_flags, &buffer2, &tname); + error = aa_path_name(&target, profile->path_flags, &buffer2, &tname, + &info); if (error) goto audit; diff --git a/security/apparmor/include/apparmor.h b/security/apparmor/include/apparmor.h index df364956081..40aedd9f73e 100644 --- a/security/apparmor/include/apparmor.h +++ b/security/apparmor/include/apparmor.h @@ -19,6 +19,19 @@ #include "match.h" +/* + * Class of mediation types in the AppArmor policy db + */ +#define AA_CLASS_ENTRY 0 +#define AA_CLASS_UNKNOWN 1 +#define AA_CLASS_FILE 2 +#define AA_CLASS_CAP 3 +#define AA_CLASS_NET 4 +#define AA_CLASS_RLIMITS 5 +#define AA_CLASS_DOMAIN 6 + +#define AA_CLASS_LAST AA_CLASS_DOMAIN + /* Control parameters settable through module/boot flags */ extern enum audit_mode aa_g_audit; extern bool aa_g_audit_header; @@ -81,7 +94,7 @@ static inline unsigned int aa_dfa_null_transition(struct aa_dfa *dfa, unsigned int start) { /* the null transition only needs the string's null terminator byte */ - return aa_dfa_match_len(dfa, start, "", 1); + return aa_dfa_next(dfa, start, 0); } static inline bool mediated_filesystem(struct inode *inode) diff --git a/security/apparmor/include/apparmorfs.h b/security/apparmor/include/apparmorfs.h index cb1e93a114d..7ea4769fab3 100644 --- a/security/apparmor/include/apparmorfs.h +++ b/security/apparmor/include/apparmorfs.h @@ -15,6 +15,50 @@ #ifndef __AA_APPARMORFS_H #define __AA_APPARMORFS_H +enum aa_fs_type { + AA_FS_TYPE_BOOLEAN, + AA_FS_TYPE_STRING, + AA_FS_TYPE_U64, + AA_FS_TYPE_FOPS, + AA_FS_TYPE_DIR, +}; + +struct aa_fs_entry; + +struct aa_fs_entry { + const char *name; + struct dentry *dentry; + umode_t mode; + enum aa_fs_type v_type; + union { + bool boolean; + char *string; + unsigned long u64; + struct aa_fs_entry *files; + } v; + const struct file_operations *file_ops; +}; + +extern const struct file_operations aa_fs_seq_file_ops; + +#define AA_FS_FILE_BOOLEAN(_name, _value) \ + { .name = (_name), .mode = 0444, \ + .v_type = AA_FS_TYPE_BOOLEAN, .v.boolean = (_value), \ + .file_ops = &aa_fs_seq_file_ops } +#define AA_FS_FILE_STRING(_name, _value) \ + { .name = (_name), .mode = 0444, \ + .v_type = AA_FS_TYPE_STRING, .v.string = (_value), \ + .file_ops = &aa_fs_seq_file_ops } +#define AA_FS_FILE_U64(_name, _value) \ + { .name = (_name), .mode = 0444, \ + .v_type = AA_FS_TYPE_U64, .v.u64 = (_value), \ + .file_ops = &aa_fs_seq_file_ops } +#define AA_FS_FILE_FOPS(_name, _mode, _fops) \ + { .name = (_name), .v_type = AA_FS_TYPE_FOPS, \ + .mode = (_mode), .file_ops = (_fops) } +#define AA_FS_DIR(_name, _value) \ + { .name = (_name), .v_type = AA_FS_TYPE_DIR, .v.files = (_value) } + extern void __init aa_destroy_aafs(void); #endif /* __AA_APPARMORFS_H */ diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/audit.h index 1951786d32e..4ba78c203af 100644 --- a/security/apparmor/include/audit.h +++ b/security/apparmor/include/audit.h @@ -25,11 +25,9 @@ struct aa_profile; -extern const char *audit_mode_names[]; +extern const char *const audit_mode_names[]; #define AUDIT_MAX_INDEX 5 -#define AUDIT_APPARMOR_AUTO 0 /* auto choose audit message type */ - enum audit_mode { AUDIT_NORMAL, /* follow normal auditing of accesses */ AUDIT_QUIET_DENIED, /* quiet all denied access messages */ @@ -45,10 +43,11 @@ enum audit_type { AUDIT_APPARMOR_HINT, AUDIT_APPARMOR_STATUS, AUDIT_APPARMOR_ERROR, - AUDIT_APPARMOR_KILL + AUDIT_APPARMOR_KILL, + AUDIT_APPARMOR_AUTO }; -extern const char *op_table[]; +extern const char *const op_table[]; enum aa_ops { OP_NULL, diff --git a/security/apparmor/include/file.h b/security/apparmor/include/file.h index ab8c6d87f75..f98fd4701d8 100644 --- a/security/apparmor/include/file.h +++ b/security/apparmor/include/file.h @@ -117,7 +117,7 @@ static inline u16 dfa_map_xindex(u16 mask) index |= AA_X_NAME; } else if (old_index == 3) { index |= AA_X_NAME | AA_X_CHILD; - } else { + } else if (old_index) { index |= AA_X_TABLE; index |= old_index - 4; } diff --git a/security/apparmor/include/match.h b/security/apparmor/include/match.h index a4a863997bd..775843e7f98 100644 --- a/security/apparmor/include/match.h +++ b/security/apparmor/include/match.h @@ -116,6 +116,9 @@ unsigned int aa_dfa_match_len(struct aa_dfa *dfa, unsigned int start, const char *str, int len); unsigned int aa_dfa_match(struct aa_dfa *dfa, unsigned int start, const char *str); +unsigned int aa_dfa_next(struct aa_dfa *dfa, unsigned int state, + const char c); + void aa_dfa_free_kref(struct kref *kref); /** diff --git a/security/apparmor/include/path.h b/security/apparmor/include/path.h index 27b327a7fae..286ac75dc88 100644 --- a/security/apparmor/include/path.h +++ b/security/apparmor/include/path.h @@ -26,6 +26,7 @@ enum path_flags { PATH_MEDIATE_DELETED = 0x10000, /* mediate deleted paths */ }; -int aa_get_name(struct path *path, int flags, char **buffer, const char **name); +int aa_path_name(struct path *path, int flags, char **buffer, + const char **name, const char **info); #endif /* __AA_PATH_H */ diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h index aeda5cf5690..bda4569fdd8 100644 --- a/security/apparmor/include/policy.h +++ b/security/apparmor/include/policy.h @@ -29,7 +29,7 @@ #include "file.h" #include "resource.h" -extern const char *profile_mode_names[]; +extern const char *const profile_mode_names[]; #define APPARMOR_NAMES_MAX_INDEX 3 #define COMPLAIN_MODE(_profile) \ @@ -129,6 +129,17 @@ struct aa_namespace { struct list_head sub_ns; }; +/* struct aa_policydb - match engine for a policy + * dfa: dfa pattern match + * start: set of start states for the different classes of data + */ +struct aa_policydb { + /* Generic policy DFA specific rule types will be subsections of it */ + struct aa_dfa *dfa; + unsigned int start[AA_CLASS_LAST + 1]; + +}; + /* struct aa_profile - basic confinement data * @base - base components of the profile (name, refcount, lists, lock ...) * @parent: parent of profile @@ -143,6 +154,7 @@ struct aa_namespace { * @flags: flags controlling profile behavior * @path_flags: flags controlling path generation behavior * @size: the memory consumed by this profiles rules + * @policy: general match rules governing policy * @file: The set of rules governing basic file access and domain transitions * @caps: capabilities for the profile * @rlimits: rlimits for the profile @@ -179,6 +191,7 @@ struct aa_profile { u32 path_flags; int size; + struct aa_policydb policy; struct aa_file_rules file; struct aa_caps caps; struct aa_rlimit rlimits; diff --git a/security/apparmor/include/resource.h b/security/apparmor/include/resource.h index 02baec732bb..d3f4cf02795 100644 --- a/security/apparmor/include/resource.h +++ b/security/apparmor/include/resource.h @@ -18,6 +18,8 @@ #include <linux/resource.h> #include <linux/sched.h> +#include "apparmorfs.h" + struct aa_profile; /* struct aa_rlimit - rlimit settings for the profile @@ -32,6 +34,8 @@ struct aa_rlimit { struct rlimit limits[RLIM_NLIMITS]; }; +extern struct aa_fs_entry aa_fs_entry_rlimit[]; + int aa_map_resource(int resource); int aa_task_setrlimit(struct aa_profile *profile, struct task_struct *, unsigned int resource, struct rlimit *new_rlim); diff --git a/security/apparmor/match.c b/security/apparmor/match.c index 94de6b4907c..90971a8c378 100644 --- a/security/apparmor/match.c +++ b/security/apparmor/match.c @@ -335,12 +335,12 @@ unsigned int aa_dfa_match_len(struct aa_dfa *dfa, unsigned int start, } /** - * aa_dfa_next_state - traverse @dfa to find state @str stops at + * aa_dfa_match - traverse @dfa to find state @str stops at * @dfa: the dfa to match @str against (NOT NULL) * @start: the state of the dfa to start matching in * @str: the null terminated string of bytes to match against the dfa (NOT NULL) * - * aa_dfa_next_state will match @str against the dfa and return the state it + * aa_dfa_match will match @str against the dfa and return the state it * finished matching in. The final state can be used to look up the accepting * label, or as the start state of a continuing match. * @@ -349,5 +349,79 @@ unsigned int aa_dfa_match_len(struct aa_dfa *dfa, unsigned int start, unsigned int aa_dfa_match(struct aa_dfa *dfa, unsigned int start, const char *str) { - return aa_dfa_match_len(dfa, start, str, strlen(str)); + u16 *def = DEFAULT_TABLE(dfa); + u32 *base = BASE_TABLE(dfa); + u16 *next = NEXT_TABLE(dfa); + u16 *check = CHECK_TABLE(dfa); + unsigned int state = start, pos; + + if (state == 0) + return 0; + + /* current state is <state>, matching character *str */ + if (dfa->tables[YYTD_ID_EC]) { + /* Equivalence class table defined */ + u8 *equiv = EQUIV_TABLE(dfa); + /* default is direct to next state */ + while (*str) { + pos = base[state] + equiv[(u8) *str++]; + if (check[pos] == state) + state = next[pos]; + else + state = def[state]; + } + } else { + /* default is direct to next state */ + while (*str) { + pos = base[state] + (u8) *str++; + if (check[pos] == state) + state = next[pos]; + else + state = def[state]; + } + } + + return state; +} + +/** + * aa_dfa_next - step one character to the next state in the dfa + * @dfa: the dfa to tranverse (NOT NULL) + * @state: the state to start in + * @c: the input character to transition on + * + * aa_dfa_match will step through the dfa by one input character @c + * + * Returns: state reach after input @c + */ +unsigned int aa_dfa_next(struct aa_dfa *dfa, unsigned int state, + const char c) +{ + u16 *def = DEFAULT_TABLE(dfa); + u32 *base = BASE_TABLE(dfa); + u16 *next = NEXT_TABLE(dfa); + u16 *check = CHECK_TABLE(dfa); + unsigned int pos; + + /* current state is <state>, matching character *str */ + if (dfa->tables[YYTD_ID_EC]) { + /* Equivalence class table defined */ + u8 *equiv = EQUIV_TABLE(dfa); + /* default is direct to next state */ + + pos = base[state] + equiv[(u8) c]; + if (check[pos] == state) + state = next[pos]; + else + state = def[state]; + } else { + /* default is direct to next state */ + pos = base[state] + (u8) c; + if (check[pos] == state) + state = next[pos]; + else + state = def[state]; + } + + return state; } diff --git a/security/apparmor/path.c b/security/apparmor/path.c index 9d070a7c3ff..2daeea4f926 100644 --- a/security/apparmor/path.c +++ b/security/apparmor/path.c @@ -83,31 +83,29 @@ static int d_namespace_path(struct path *path, char *buf, int buflen, struct path root; get_fs_root(current->fs, &root); res = __d_path(path, &root, buf, buflen); - if (res && !IS_ERR(res)) { - /* everything's fine */ - *name = res; - path_put(&root); - goto ok; - } path_put(&root); - connected = 0; + } else { + res = d_absolute_path(path, buf, buflen); + if (!our_mnt(path->mnt)) + connected = 0; } - res = d_absolute_path(path, buf, buflen); - - *name = res; /* handle error conditions - and still allow a partial path to * be returned. */ - if (IS_ERR(res)) { - error = PTR_ERR(res); - *name = buf; - goto out; - } - if (!our_mnt(path->mnt)) + if (!res || IS_ERR(res)) { connected = 0; + res = dentry_path_raw(path->dentry, buf, buflen); + if (IS_ERR(res)) { + error = PTR_ERR(res); + *name = buf; + goto out; + }; + } else if (!our_mnt(path->mnt)) + connected = 0; + + *name = res; -ok: /* Handle two cases: * 1. A deleted dentry && profile is not allowing mediation of deleted * 2. On some filesystems, newly allocated dentries appear to the @@ -138,7 +136,7 @@ ok: /* disconnected path, don't return pathname starting * with '/' */ - error = -ESTALE; + error = -EACCES; if (*res == '/') *name = res + 1; } @@ -159,7 +157,7 @@ out: * Returns: %0 else error on failure */ static int get_name_to_buffer(struct path *path, int flags, char *buffer, - int size, char **name) + int size, char **name, const char **info) { int adjust = (flags & PATH_IS_DIR) ? 1 : 0; int error = d_namespace_path(path, buffer, size - adjust, name, flags); @@ -171,15 +169,27 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer, */ strcpy(&buffer[size - 2], "/"); + if (info && error) { + if (error == -ENOENT) + *info = "Failed name lookup - deleted entry"; + else if (error == -ESTALE) + *info = "Failed name lookup - disconnected path"; + else if (error == -ENAMETOOLONG) + *info = "Failed name lookup - name too long"; + else + *info = "Failed name lookup"; + } + return error; } /** - * aa_get_name - compute the pathname of a file + * aa_path_name - compute the pathname of a file * @path: path the file (NOT NULL) * @flags: flags controlling path name generation * @buffer: buffer that aa_get_name() allocated (NOT NULL) * @name: Returns - the generated path name if !error (NOT NULL) + * @info: Returns - information on why the path lookup failed (MAYBE NULL) * * @name is a pointer to the beginning of the pathname (which usually differs * from the beginning of the buffer), or NULL. If there is an error @name @@ -192,7 +202,8 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer, * * Returns: %0 else error code if could retrieve name */ -int aa_get_name(struct path *path, int flags, char **buffer, const char **name) +int aa_path_name(struct path *path, int flags, char **buffer, const char **name, + const char **info) { char *buf, *str = NULL; int size = 256; @@ -206,7 +217,7 @@ int aa_get_name(struct path *path, int flags, char **buffer, const char **name) if (!buf) return -ENOMEM; - error = get_name_to_buffer(path, flags, buf, size, &str); + error = get_name_to_buffer(path, flags, buf, size, &str, info); if (error != -ENAMETOOLONG) break; @@ -214,6 +225,7 @@ int aa_get_name(struct path *path, int flags, char **buffer, const char **name) size <<= 1; if (size > aa_g_path_max) return -ENAMETOOLONG; + *info = NULL; } *buffer = buf; *name = str; diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c index 4f0eadee78b..90641438302 100644 --- a/security/apparmor/policy.c +++ b/security/apparmor/policy.c @@ -93,7 +93,7 @@ /* root profile namespace */ struct aa_namespace *root_ns; -const char *profile_mode_names[] = { +const char *const profile_mode_names[] = { "enforce", "complain", "kill", @@ -749,6 +749,7 @@ static void free_profile(struct aa_profile *profile) aa_free_sid(profile->sid); aa_put_dfa(profile->xmatch); + aa_put_dfa(profile->policy.dfa); aa_put_profile(profile->replacedby); diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c index 741dd13e089..25fd51edc8d 100644 --- a/security/apparmor/policy_unpack.c +++ b/security/apparmor/policy_unpack.c @@ -84,7 +84,7 @@ static void audit_cb(struct audit_buffer *ab, void *va) * @new: profile if it has been allocated (MAYBE NULL) * @name: name of the profile being manipulated (MAYBE NULL) * @info: any extra info about the failure (MAYBE NULL) - * @e: buffer position info (NOT NULL) + * @e: buffer position info * @error: error code * * Returns: %0 or error @@ -95,7 +95,8 @@ static int audit_iface(struct aa_profile *new, const char *name, struct aa_profile *profile = __aa_current_profile(); struct common_audit_data sa; COMMON_AUDIT_DATA_INIT(&sa, NONE); - sa.aad.iface.pos = e->pos - e->start; + if (e) + sa.aad.iface.pos = e->pos - e->start; sa.aad.iface.target = new; sa.aad.name = name; sa.aad.info = info; @@ -468,7 +469,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e) { struct aa_profile *profile = NULL; const char *name = NULL; - int error = -EPROTO; + int i, error = -EPROTO; kernel_cap_t tmpcap; u32 tmp; @@ -554,11 +555,35 @@ static struct aa_profile *unpack_profile(struct aa_ext *e) goto fail; if (!unpack_u32(e, &(profile->caps.extended.cap[1]), NULL)) goto fail; + if (!unpack_nameX(e, AA_STRUCTEND, NULL)) + goto fail; } if (!unpack_rlimits(e, profile)) goto fail; + if (unpack_nameX(e, AA_STRUCT, "policydb")) { + /* generic policy dfa - optional and may be NULL */ + profile->policy.dfa = unpack_dfa(e); + if (IS_ERR(profile->policy.dfa)) { + error = PTR_ERR(profile->policy.dfa); + profile->policy.dfa = NULL; + goto fail; + } + if (!unpack_u32(e, &profile->policy.start[0], "start")) + /* default start state */ + profile->policy.start[0] = DFA_START; + /* setup class index */ + for (i = AA_CLASS_FILE; i <= AA_CLASS_LAST; i++) { + profile->policy.start[i] = + aa_dfa_next(profile->policy.dfa, + profile->policy.start[0], + i); + } + if (!unpack_nameX(e, AA_STRUCTEND, NULL)) + goto fail; + } + /* get file rules */ profile->file.dfa = unpack_dfa(e); if (IS_ERR(profile->file.dfa)) { diff --git a/security/apparmor/resource.c b/security/apparmor/resource.c index a4136c10b1c..72c25a4f2cf 100644 --- a/security/apparmor/resource.c +++ b/security/apparmor/resource.c @@ -23,6 +23,11 @@ */ #include "rlim_names.h" +struct aa_fs_entry aa_fs_entry_rlimit[] = { + AA_FS_FILE_STRING("mask", AA_FS_RLIMIT_MASK), + { } +}; + /* audit callback for resource specific fields */ static void audit_cb(struct audit_buffer *ab, void *va) { |