diff options
Diffstat (limited to 'security')
-rw-r--r-- | security/selinux/hooks.c | 15 | ||||
-rw-r--r-- | security/selinux/include/security.h | 8 | ||||
-rw-r--r-- | security/selinux/ss/avtab.h | 22 | ||||
-rw-r--r-- | security/selinux/ss/policydb.c | 130 | ||||
-rw-r--r-- | security/selinux/ss/policydb.h | 14 | ||||
-rw-r--r-- | security/selinux/ss/services.c | 45 |
6 files changed, 197 insertions, 37 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 099bbd07732f..6ae19fd28be5 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -1301,10 +1301,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent /* Try to obtain a transition SID. */ isec->sclass = inode_mode_to_security_class(inode->i_mode); - rc = security_transition_sid(isec->task_sid, - sbsec->sid, - isec->sclass, - &sid); + rc = security_transition_sid(isec->task_sid, sbsec->sid, + isec->sclass, NULL, &sid); if (rc) goto out_unlock; isec->sid = sid; @@ -1579,7 +1577,7 @@ static int may_create(struct inode *dir, return rc; if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { - rc = security_transition_sid(sid, dsec->sid, tclass, &newsid); + rc = security_transition_sid(sid, dsec->sid, tclass, NULL, &newsid); if (rc) return rc; } @@ -2061,7 +2059,8 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm) } else { /* Check for a default transition on this program. */ rc = security_transition_sid(old_tsec->sid, isec->sid, - SECCLASS_PROCESS, &new_tsec->sid); + SECCLASS_PROCESS, NULL, + &new_tsec->sid); if (rc) return rc; } @@ -2532,7 +2531,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, else if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { rc = security_transition_sid(sid, dsec->sid, inode_mode_to_security_class(inode->i_mode), - &newsid); + qstr, &newsid); if (rc) { printk(KERN_WARNING "%s: " "security_transition_sid failed, rc=%d (dev=%s " @@ -4845,7 +4844,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, * message queue this message will be stored in */ rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG, - &msec->sid); + NULL, &msec->sid); if (rc) return rc; } diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h index 671273eb1115..348eb00cb668 100644 --- a/security/selinux/include/security.h +++ b/security/selinux/include/security.h @@ -8,6 +8,7 @@ #ifndef _SELINUX_SECURITY_H_ #define _SELINUX_SECURITY_H_ +#include <linux/dcache.h> #include <linux/magic.h> #include <linux/types.h> #include "flask.h" @@ -28,13 +29,14 @@ #define POLICYDB_VERSION_POLCAP 22 #define POLICYDB_VERSION_PERMISSIVE 23 #define POLICYDB_VERSION_BOUNDARY 24 +#define POLICYDB_VERSION_FILENAME_TRANS 25 /* Range of policy versions we understand*/ #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX #define POLICYDB_VERSION_MAX CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE #else -#define POLICYDB_VERSION_MAX POLICYDB_VERSION_BOUNDARY +#define POLICYDB_VERSION_MAX POLICYDB_VERSION_FILENAME_TRANS #endif /* Mask for just the mount related flags */ @@ -106,8 +108,8 @@ void security_compute_av(u32 ssid, u32 tsid, void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass, struct av_decision *avd); -int security_transition_sid(u32 ssid, u32 tsid, - u16 tclass, u32 *out_sid); +int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, + const struct qstr *qstr, u32 *out_sid); int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid); diff --git a/security/selinux/ss/avtab.h b/security/selinux/ss/avtab.h index 3417f9cc1cbd..63ce2f9e441d 100644 --- a/security/selinux/ss/avtab.h +++ b/security/selinux/ss/avtab.h @@ -14,7 +14,7 @@ * * Copyright (C) 2003 Tresys Technology, LLC * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by + * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2. * * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp> @@ -27,16 +27,16 @@ struct avtab_key { u16 source_type; /* source type */ u16 target_type; /* target type */ u16 target_class; /* target object class */ -#define AVTAB_ALLOWED 1 -#define AVTAB_AUDITALLOW 2 -#define AVTAB_AUDITDENY 4 -#define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY) -#define AVTAB_TRANSITION 16 -#define AVTAB_MEMBER 32 -#define AVTAB_CHANGE 64 -#define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE) -#define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */ -#define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */ +#define AVTAB_ALLOWED 0x0001 +#define AVTAB_AUDITALLOW 0x0002 +#define AVTAB_AUDITDENY 0x0004 +#define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY) +#define AVTAB_TRANSITION 0x0010 +#define AVTAB_MEMBER 0x0020 +#define AVTAB_CHANGE 0x0040 +#define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE) +#define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */ +#define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */ u16 specified; /* what field is specified */ }; diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index be9de3872837..159c81806760 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -123,6 +123,11 @@ static struct policydb_compat_info policydb_compat[] = { .sym_num = SYM_NUM, .ocon_num = OCON_NUM, }, + { + .version = POLICYDB_VERSION_FILENAME_TRANS, + .sym_num = SYM_NUM, + .ocon_num = OCON_NUM, + }, }; static struct policydb_compat_info *policydb_lookup_compat(int version) @@ -704,6 +709,7 @@ void policydb_destroy(struct policydb *p) int i; struct role_allow *ra, *lra = NULL; struct role_trans *tr, *ltr = NULL; + struct filename_trans *ft, *nft; for (i = 0; i < SYM_NUM; i++) { cond_resched(); @@ -781,6 +787,15 @@ void policydb_destroy(struct policydb *p) } flex_array_free(p->type_attr_map_array); } + + ft = p->filename_trans; + while (ft) { + nft = ft->next; + kfree(ft->name); + kfree(ft); + ft = nft; + } + ebitmap_destroy(&p->policycaps); ebitmap_destroy(&p->permissive_map); @@ -1788,6 +1803,76 @@ out: return rc; } +static int filename_trans_read(struct policydb *p, void *fp) +{ + struct filename_trans *ft, *last; + u32 nel, len; + char *name; + __le32 buf[4]; + int rc, i; + + if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS) + return 0; + + rc = next_entry(buf, fp, sizeof(u32)); + if (rc) + goto out; + nel = le32_to_cpu(buf[0]); + + printk(KERN_ERR "%s: nel=%d\n", __func__, nel); + + last = p->filename_trans; + while (last && last->next) + last = last->next; + + for (i = 0; i < nel; i++) { + rc = -ENOMEM; + ft = kzalloc(sizeof(*ft), GFP_KERNEL); + if (!ft) + goto out; + + /* add it to the tail of the list */ + if (!last) + p->filename_trans = ft; + else + last->next = ft; + last = ft; + + /* length of the path component string */ + rc = next_entry(buf, fp, sizeof(u32)); + if (rc) + goto out; + len = le32_to_cpu(buf[0]); + + rc = -ENOMEM; + name = kmalloc(len + 1, GFP_KERNEL); + if (!name) + goto out; + + ft->name = name; + + /* path component string */ + rc = next_entry(name, fp, len); + if (rc) + goto out; + name[len] = 0; + + printk(KERN_ERR "%s: ft=%p ft->name=%p ft->name=%s\n", __func__, ft, ft->name, ft->name); + + rc = next_entry(buf, fp, sizeof(u32) * 4); + if (rc) + goto out; + + ft->stype = le32_to_cpu(buf[0]); + ft->ttype = le32_to_cpu(buf[1]); + ft->tclass = le32_to_cpu(buf[2]); + ft->otype = le32_to_cpu(buf[3]); + } + rc = 0; +out: + return rc; +} + static int genfs_read(struct policydb *p, void *fp) { int i, j, rc; @@ -2251,6 +2336,10 @@ int policydb_read(struct policydb *p, void *fp) lra = ra; } + rc = filename_trans_read(p, fp); + if (rc) + goto bad; + rc = policydb_index(p); if (rc) goto bad; @@ -3025,6 +3114,43 @@ static int range_write(struct policydb *p, void *fp) return 0; } +static int filename_trans_write(struct policydb *p, void *fp) +{ + struct filename_trans *ft; + u32 len, nel = 0; + __le32 buf[4]; + int rc; + + for (ft = p->filename_trans; ft; ft = ft->next) + nel++; + + buf[0] = cpu_to_le32(nel); + rc = put_entry(buf, sizeof(u32), 1, fp); + if (rc) + return rc; + + for (ft = p->filename_trans; ft; ft = ft->next) { + len = strlen(ft->name); + buf[0] = cpu_to_le32(len); + rc = put_entry(buf, sizeof(u32), 1, fp); + if (rc) + return rc; + + rc = put_entry(ft->name, sizeof(char), len, fp); + if (rc) + return rc; + + buf[0] = ft->stype; + buf[1] = ft->ttype; + buf[2] = ft->tclass; + buf[3] = ft->otype; + + rc = put_entry(buf, sizeof(u32), 4, fp); + if (rc) + return rc; + } + return 0; +} /* * Write the configuration data in a policy database * structure to a policy database binary representation @@ -3135,6 +3261,10 @@ int policydb_write(struct policydb *p, void *fp) if (rc) return rc; + rc = filename_trans_write(p, fp); + if (rc) + return rc; + rc = ocontext_write(p, info, fp); if (rc) return rc; diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h index 4e3ab9d0b315..732ea4a68682 100644 --- a/security/selinux/ss/policydb.h +++ b/security/selinux/ss/policydb.h @@ -77,6 +77,15 @@ struct role_trans { struct role_trans *next; }; +struct filename_trans { + struct filename_trans *next; + u32 stype; /* current process */ + u32 ttype; /* parent dir context */ + u16 tclass; /* class of new object */ + const char *name; /* last path component */ + u32 otype; /* expected of new object */ +}; + struct role_allow { u32 role; /* current role */ u32 new_role; /* new role */ @@ -217,6 +226,9 @@ struct policydb { /* role transitions */ struct role_trans *role_tr; + /* file transitions with the last path component */ + struct filename_trans *filename_trans; + /* bools indexed by (value - 1) */ struct cond_bool_datum **bool_val_to_struct; /* type enforcement conditional access vectors and transitions */ @@ -302,7 +314,7 @@ static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) return 0; } -static inline int put_entry(void *buf, size_t bytes, int num, struct policy_file *fp) +static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp) { size_t len = bytes * num; diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index a03cfaf0ee07..2e36e03c21f2 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -1343,10 +1343,27 @@ out: return -EACCES; } +static void filename_compute_type(struct policydb *p, struct context *newcontext, + u32 scon, u32 tcon, u16 tclass, + const struct qstr *qstr) +{ + struct filename_trans *ft; + for (ft = p->filename_trans; ft; ft = ft->next) { + if (ft->stype == scon && + ft->ttype == tcon && + ft->tclass == tclass && + !strcmp(ft->name, qstr->name)) { + newcontext->type = ft->otype; + return; + } + } +} + static int security_compute_sid(u32 ssid, u32 tsid, u16 orig_tclass, u32 specified, + const struct qstr *qstr, u32 *out_sid, bool kern) { @@ -1442,6 +1459,11 @@ static int security_compute_sid(u32 ssid, newcontext.type = avdatum->data; } + /* if we have a qstr this is a file trans check so check those rules */ + if (qstr) + filename_compute_type(&policydb, &newcontext, scontext->type, + tcontext->type, tclass, qstr); + /* Check for class-specific changes. */ if (tclass == policydb.process_class) { if (specified & AVTAB_TRANSITION) { @@ -1495,22 +1517,17 @@ out: * if insufficient memory is available, or %0 if the new SID was * computed successfully. */ -int security_transition_sid(u32 ssid, - u32 tsid, - u16 tclass, - u32 *out_sid) +int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, + const struct qstr *qstr, u32 *out_sid) { return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, - out_sid, true); + qstr, out_sid, true); } -int security_transition_sid_user(u32 ssid, - u32 tsid, - u16 tclass, - u32 *out_sid) +int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid) { return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, - out_sid, false); + NULL, out_sid, false); } /** @@ -1531,8 +1548,8 @@ int security_member_sid(u32 ssid, u16 tclass, u32 *out_sid) { - return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid, - false); + return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL, + out_sid, false); } /** @@ -1553,8 +1570,8 @@ int security_change_sid(u32 ssid, u16 tclass, u32 *out_sid) { - return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid, - false); + return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL, + out_sid, false); } /* Clone the SID into the new SID table. */ |