diff options
| -rw-r--r-- | include/linux/security.h | 26 | ||||
| -rw-r--r-- | security/capability.c | 15 | ||||
| -rw-r--r-- | security/security.c | 13 | ||||
| -rw-r--r-- | security/selinux/hooks.c | 3 | ||||
| -rw-r--r-- | security/selinux/include/xfrm.h | 4 | ||||
| -rw-r--r-- | security/selinux/xfrm.c | 199 |
6 files changed, 128 insertions, 132 deletions
diff --git a/include/linux/security.h b/include/linux/security.h index 4686491852a7..e5a5e8a41e55 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -1039,17 +1039,25 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts) * @xfrm_policy_delete_security: * @ctx contains the xfrm_sec_ctx. * Authorize deletion of xp->security. - * @xfrm_state_alloc_security: + * @xfrm_state_alloc: * @x contains the xfrm_state being added to the Security Association * Database by the XFRM system. * @sec_ctx contains the security context information being provided by * the user-level SA generation program (e.g., setkey or racoon). - * @secid contains the secid from which to take the mls portion of the context. * Allocate a security structure to the x->security field; the security * field is initialized to NULL when the xfrm_state is allocated. Set the - * context to correspond to either sec_ctx or polsec, with the mls portion - * taken from secid in the latter case. - * Return 0 if operation was successful (memory to allocate, legal context). + * context to correspond to sec_ctx. Return 0 if operation was successful + * (memory to allocate, legal context). + * @xfrm_state_alloc_acquire: + * @x contains the xfrm_state being added to the Security Association + * Database by the XFRM system. + * @polsec contains the policy's security context. + * @secid contains the secid from which to take the mls portion of the + * context. + * Allocate a security structure to the x->security field; the security + * field is initialized to NULL when the xfrm_state is allocated. Set the + * context to correspond to secid. Return 0 if operation was successful + * (memory to allocate, legal context). * @xfrm_state_free_security: * @x contains the xfrm_state. * Deallocate x->security. @@ -1651,9 +1659,11 @@ struct security_operations { int (*xfrm_policy_clone_security) (struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctx); void (*xfrm_policy_free_security) (struct xfrm_sec_ctx *ctx); int (*xfrm_policy_delete_security) (struct xfrm_sec_ctx *ctx); - int (*xfrm_state_alloc_security) (struct xfrm_state *x, - struct xfrm_user_sec_ctx *sec_ctx, - u32 secid); + int (*xfrm_state_alloc) (struct xfrm_state *x, + struct xfrm_user_sec_ctx *sec_ctx); + int (*xfrm_state_alloc_acquire) (struct xfrm_state *x, + struct xfrm_sec_ctx *polsec, + u32 secid); void (*xfrm_state_free_security) (struct xfrm_state *x); int (*xfrm_state_delete_security) (struct xfrm_state *x); int (*xfrm_policy_lookup) (struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir); diff --git a/security/capability.c b/security/capability.c index 1728d4e375db..67afc679719a 100644 --- a/security/capability.c +++ b/security/capability.c @@ -767,9 +767,15 @@ static int cap_xfrm_policy_delete_security(struct xfrm_sec_ctx *ctx) return 0; } -static int cap_xfrm_state_alloc_security(struct xfrm_state *x, - struct xfrm_user_sec_ctx *sec_ctx, - u32 secid) +static int cap_xfrm_state_alloc(struct xfrm_state *x, + struct xfrm_user_sec_ctx *sec_ctx) +{ + return 0; +} + +static int cap_xfrm_state_alloc_acquire(struct xfrm_state *x, + struct xfrm_sec_ctx *polsec, + u32 secid) { return 0; } @@ -1084,7 +1090,8 @@ void __init security_fixup_ops(struct security_operations *ops) set_to_cap_if_null(ops, xfrm_policy_clone_security); set_to_cap_if_null(ops, xfrm_policy_free_security); set_to_cap_if_null(ops, xfrm_policy_delete_security); - set_to_cap_if_null(ops, xfrm_state_alloc_security); + set_to_cap_if_null(ops, xfrm_state_alloc); + set_to_cap_if_null(ops, xfrm_state_alloc_acquire); set_to_cap_if_null(ops, xfrm_state_free_security); set_to_cap_if_null(ops, xfrm_state_delete_security); set_to_cap_if_null(ops, xfrm_policy_lookup); diff --git a/security/security.c b/security/security.c index a3dce87d1aef..57e25c962968 100644 --- a/security/security.c +++ b/security/security.c @@ -1322,22 +1322,17 @@ int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx) return security_ops->xfrm_policy_delete_security(ctx); } -int security_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx) +int security_xfrm_state_alloc(struct xfrm_state *x, + struct xfrm_user_sec_ctx *sec_ctx) { - return security_ops->xfrm_state_alloc_security(x, sec_ctx, 0); + return security_ops->xfrm_state_alloc(x, sec_ctx); } EXPORT_SYMBOL(security_xfrm_state_alloc); int security_xfrm_state_alloc_acquire(struct xfrm_state *x, struct xfrm_sec_ctx *polsec, u32 secid) { - if (!polsec) - return 0; - /* - * We want the context to be taken from secid which is usually - * from the sock. - */ - return security_ops->xfrm_state_alloc_security(x, NULL, secid); + return security_ops->xfrm_state_alloc_acquire(x, polsec, secid); } int security_xfrm_state_delete(struct xfrm_state *x) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 5c6f2cd2d095..d3555bdf66af 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -5708,7 +5708,8 @@ static struct security_operations selinux_ops = { .xfrm_policy_clone_security = selinux_xfrm_policy_clone, .xfrm_policy_free_security = selinux_xfrm_policy_free, .xfrm_policy_delete_security = selinux_xfrm_policy_delete, - .xfrm_state_alloc_security = selinux_xfrm_state_alloc, + .xfrm_state_alloc = selinux_xfrm_state_alloc, + .xfrm_state_alloc_acquire = selinux_xfrm_state_alloc_acquire, .xfrm_state_free_security = selinux_xfrm_state_free, .xfrm_state_delete_security = selinux_xfrm_state_delete, .xfrm_policy_lookup = selinux_xfrm_policy_lookup, diff --git a/security/selinux/include/xfrm.h b/security/selinux/include/xfrm.h index 65f67cb0aefb..f2a2314aac1a 100644 --- a/security/selinux/include/xfrm.h +++ b/security/selinux/include/xfrm.h @@ -16,7 +16,9 @@ int selinux_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx, void selinux_xfrm_policy_free(struct xfrm_sec_ctx *ctx); int selinux_xfrm_policy_delete(struct xfrm_sec_ctx *ctx); int selinux_xfrm_state_alloc(struct xfrm_state *x, - struct xfrm_user_sec_ctx *sec_ctx, u32 secid); + struct xfrm_user_sec_ctx *uctx); +int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x, + struct xfrm_sec_ctx *polsec, u32 secid); void selinux_xfrm_state_free(struct xfrm_state *x); int selinux_xfrm_state_delete(struct xfrm_state *x); int selinux_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir); diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c index d03081886214..07ae0c06dfc3 100644 --- a/security/selinux/xfrm.c +++ b/security/selinux/xfrm.c @@ -74,6 +74,54 @@ static inline int selinux_authorizable_xfrm(struct xfrm_state *x) } /* + * Allocates a xfrm_sec_state and populates it using the supplied security + * xfrm_user_sec_ctx context. + */ +static int selinux_xfrm_alloc_user(struct xfrm_sec_ctx **ctxp, + struct xfrm_user_sec_ctx *uctx) +{ + int rc; + const struct task_security_struct *tsec = current_security(); + struct xfrm_sec_ctx *ctx = NULL; + u32 str_len; + + if (ctxp == NULL || uctx == NULL || + uctx->ctx_doi != XFRM_SC_DOI_LSM || + uctx->ctx_alg != XFRM_SC_ALG_SELINUX) + return -EINVAL; + + str_len = uctx->ctx_len; + if (str_len >= PAGE_SIZE) + return -ENOMEM; + + ctx = kmalloc(sizeof(*ctx) + str_len + 1, GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->ctx_doi = XFRM_SC_DOI_LSM; + ctx->ctx_alg = XFRM_SC_ALG_SELINUX; + ctx->ctx_len = str_len; + memcpy(ctx->ctx_str, &uctx[1], str_len); + ctx->ctx_str[str_len] = '\0'; + rc = security_context_to_sid(ctx->ctx_str, str_len, &ctx->ctx_sid); + if (rc) + goto err; + + rc = avc_has_perm(tsec->sid, ctx->ctx_sid, + SECCLASS_ASSOCIATION, ASSOCIATION__SETCONTEXT, NULL); + if (rc) + goto err; + + *ctxp = ctx; + atomic_inc(&selinux_xfrm_refcount); + return 0; + +err: + kfree(ctx); + return rc; +} + +/* * LSM hook implementation that authorizes that a flow can use * a xfrm policy rule. */ @@ -191,111 +239,13 @@ int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall) } /* - * Security blob allocation for xfrm_policy and xfrm_state - * CTX does not have a meaningful value on input - */ -static int selinux_xfrm_sec_ctx_alloc(struct xfrm_sec_ctx **ctxp, - struct xfrm_user_sec_ctx *uctx, u32 sid) -{ - int rc = 0; - const struct task_security_struct *tsec = current_security(); - struct xfrm_sec_ctx *ctx = NULL; - char *ctx_str = NULL; - u32 str_len; - - BUG_ON(uctx && sid); - - if (!uctx) - goto not_from_user; - - if (uctx->ctx_alg != XFRM_SC_ALG_SELINUX) - return -EINVAL; - - str_len = uctx->ctx_len; - if (str_len >= PAGE_SIZE) - return -ENOMEM; - - *ctxp = ctx = kmalloc(sizeof(*ctx) + - str_len + 1, - GFP_KERNEL); - - if (!ctx) - return -ENOMEM; - - ctx->ctx_doi = uctx->ctx_doi; - ctx->ctx_len = str_len; - ctx->ctx_alg = uctx->ctx_alg; - - memcpy(ctx->ctx_str, - uctx+1, - str_len); - ctx->ctx_str[str_len] = 0; - rc = security_context_to_sid(ctx->ctx_str, - str_len, - &ctx->ctx_sid); - - if (rc) - goto out; - - /* - * Does the subject have permission to set security context? - */ - rc = avc_has_perm(tsec->sid, ctx->ctx_sid, - SECCLASS_ASSOCIATION, - ASSOCIATION__SETCONTEXT, NULL); - if (rc) - goto out; - - return rc; - -not_from_user: - rc = security_sid_to_context(sid, &ctx_str, &str_len); - if (rc) - goto out; - - *ctxp = ctx = kmalloc(sizeof(*ctx) + - str_len, - GFP_ATOMIC); - - if (!ctx) { - rc = -ENOMEM; - goto out; - } - - ctx->ctx_doi = XFRM_SC_DOI_LSM; - ctx->ctx_alg = XFRM_SC_ALG_SELINUX; - ctx->ctx_sid = sid; - ctx->ctx_len = str_len; - memcpy(ctx->ctx_str, - ctx_str, - str_len); - - goto out2; - -out: - *ctxp = NULL; - kfree(ctx); -out2: - kfree(ctx_str); - return rc; -} - -/* * LSM hook implementation that allocs and transfers uctx spec to * xfrm_policy. */ int selinux_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *uctx) { - int err; - - BUG_ON(!uctx); - - err = selinux_xfrm_sec_ctx_alloc(ctxp, uctx, 0); - if (err == 0) - atomic_inc(&selinux_xfrm_refcount); - - return err; + return selinux_xfrm_alloc_user(ctxp, uctx); } @@ -347,20 +297,51 @@ int selinux_xfrm_policy_delete(struct xfrm_sec_ctx *ctx) } /* - * LSM hook implementation that allocs and transfers sec_ctx spec to - * xfrm_state. + * LSM hook implementation that allocates a xfrm_sec_state, populates it using + * the supplied security context, and assigns it to the xfrm_state. + */ +int selinux_xfrm_state_alloc(struct xfrm_state *x, + struct xfrm_user_sec_ctx *uctx) +{ + return selinux_xfrm_alloc_user(&x->security, uctx); +} + +/* + * LSM hook implementation that allocates a xfrm_sec_state and populates based + * on a secid. */ -int selinux_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *uctx, - u32 secid) +int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x, + struct xfrm_sec_ctx *polsec, u32 secid) { - int err; + int rc; + struct xfrm_sec_ctx *ctx; + char *ctx_str = NULL; + int str_len; - BUG_ON(!x); + if (!polsec) + return 0; - err = selinux_xfrm_sec_ctx_alloc(&x->security, uctx, secid); - if (err == 0) - atomic_inc(&selinux_xfrm_refcount); - return err; + if (secid == 0) + return -EINVAL; + + rc = security_sid_to_context(secid, &ctx_str, &str_len); + if (rc) + return rc; + + ctx = kmalloc(sizeof(*ctx) + str_len, GFP_ATOMIC); + if (!ctx) + return -ENOMEM; + + ctx->ctx_doi = XFRM_SC_DOI_LSM; + ctx->ctx_alg = XFRM_SC_ALG_SELINUX; + ctx->ctx_sid = secid; + ctx->ctx_len = str_len; + memcpy(ctx->ctx_str, ctx_str, str_len); + kfree(ctx_str); + + x->security = ctx; + atomic_inc(&selinux_xfrm_refcount); + return 0; } /* |
