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crypto/algif_aead.c
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/* * algif_aead: User-space interface for AEAD algorithms * * Copyright (C) 2014, Stephan Mueller <smueller@chronox.de> * * This file provides the user-space API for AEAD ciphers. * |
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* 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 the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. |
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* * The following concept of the memory management is used: * * The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is * filled by user space with the data submitted via sendpage/sendmsg. Filling * up the TX SGL does not cause a crypto operation -- the data will only be * tracked by the kernel. Upon receipt of one recvmsg call, the caller must * provide a buffer which is tracked with the RX SGL. * * During the processing of the recvmsg operation, the cipher request is * allocated and prepared. As part of the recvmsg operation, the processed * TX buffers are extracted from the TX SGL into a separate SGL. * * After the completion of the crypto operation, the RX SGL and the cipher * request is released. The extracted TX SGL parts are released together with * the RX SGL release. |
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*/ |
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#include <crypto/internal/aead.h> |
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#include <crypto/scatterwalk.h> #include <crypto/if_alg.h> |
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#include <crypto/skcipher.h> #include <crypto/null.h> |
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#include <linux/init.h> #include <linux/list.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/net.h> #include <net/sock.h> |
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struct aead_tfm { struct crypto_aead *aead; bool has_key; |
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struct crypto_skcipher *null_tfm; |
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}; |
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static inline bool aead_sufficient_data(struct sock *sk) { struct alg_sock *ask = alg_sk(sk); struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); |
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struct af_alg_ctx *ctx = ask->private; |
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struct aead_tfm *aeadc = pask->private; struct crypto_aead *tfm = aeadc->aead; unsigned int as = crypto_aead_authsize(tfm); |
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/* * The minimum amount of memory needed for an AEAD cipher is * the AAD and in case of decryption the tag. */ return ctx->used >= ctx->aead_assoclen + (ctx->enc ? 0 : as); |
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} |
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static int aead_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
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{ struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); |
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struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); |
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struct aead_tfm *aeadc = pask->private; struct crypto_aead *tfm = aeadc->aead; unsigned int ivsize = crypto_aead_ivsize(tfm); |
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return af_alg_sendmsg(sock, msg, size, ivsize); |
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} |
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static int crypto_aead_copy_sgl(struct crypto_skcipher *null_tfm, struct scatterlist *src, struct scatterlist *dst, unsigned int len) { SKCIPHER_REQUEST_ON_STACK(skreq, null_tfm); skcipher_request_set_tfm(skreq, null_tfm); skcipher_request_set_callback(skreq, CRYPTO_TFM_REQ_MAY_BACKLOG, NULL, NULL); skcipher_request_set_crypt(skreq, src, dst, len, NULL); return crypto_skcipher_encrypt(skreq); } |
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static int _aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) |
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{ struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); |
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struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); |
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struct af_alg_ctx *ctx = ask->private; |
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struct aead_tfm *aeadc = pask->private; struct crypto_aead *tfm = aeadc->aead; |
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struct crypto_skcipher *null_tfm = aeadc->null_tfm; |
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unsigned int i, as = crypto_aead_authsize(tfm); |
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struct af_alg_async_req *areq; |
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struct af_alg_tsgl *tsgl, *tmp; struct scatterlist *rsgl_src, *tsgl_src = NULL; |
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int err = 0; size_t used = 0; /* [in] TX bufs to be en/decrypted */ size_t outlen = 0; /* [out] RX bufs produced by kernel */ size_t usedpages = 0; /* [in] RX bufs to be used from user */ size_t processed = 0; /* [in] TX bufs to be consumed */ |
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if (!ctx->used) { err = af_alg_wait_for_data(sk, flags); if (err) return err; } |
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/* |
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* Data length provided by caller via sendmsg/sendpage that has not * yet been processed. |
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*/ |
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used = ctx->used; /* * Make sure sufficient data is present -- note, the same check is * is also present in sendmsg/sendpage. The checks in sendpage/sendmsg * shall provide an information to the data sender that something is * wrong, but they are irrelevant to maintain the kernel integrity. * We need this check here too in case user space decides to not honor * the error message in sendmsg/sendpage and still call recvmsg. This * check here protects the kernel integrity. */ |
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if (!aead_sufficient_data(sk)) return -EINVAL; |
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/* * Calculate the minimum output buffer size holding the result of the * cipher operation. When encrypting data, the receiving buffer is * larger by the tag length compared to the input buffer as the * encryption operation generates the tag. For decryption, the input * buffer provides the tag which is consumed resulting in only the * plaintext without a buffer for the tag returned to the caller. */ if (ctx->enc) outlen = used + as; else outlen = used - as; |
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/* * The cipher operation input data is reduced by the associated data * length as this data is processed separately later on. */ |
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used -= ctx->aead_assoclen; |
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/* Allocate cipher request for current operation. */ |
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areq = af_alg_alloc_areq(sk, sizeof(struct af_alg_async_req) + crypto_aead_reqsize(tfm)); if (IS_ERR(areq)) return PTR_ERR(areq); |
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/* convert iovecs of output buffers into RX SGL */ |
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err = af_alg_get_rsgl(sk, msg, flags, areq, outlen, &usedpages); if (err) goto free; |
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/* * Ensure output buffer is sufficiently large. If the caller provides * less buffer space, only use the relative required input size. This * allows AIO operation where the caller sent all data to be processed * and the AIO operation performs the operation on the different chunks * of the input data. */ |
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if (usedpages < outlen) { |
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size_t less = outlen - usedpages; |
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if (used < less) { err = -EINVAL; goto free; } used -= less; outlen -= less; } |
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processed = used + ctx->aead_assoclen; |
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list_for_each_entry_safe(tsgl, tmp, &ctx->tsgl_list, list) { for (i = 0; i < tsgl->cur; i++) { struct scatterlist *process_sg = tsgl->sg + i; if (!(process_sg->length) || !sg_page(process_sg)) continue; tsgl_src = process_sg; break; } if (tsgl_src) break; } if (processed && !tsgl_src) { err = -EFAULT; goto free; } |
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/* |
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* Copy of AAD from source to destination * * The AAD is copied to the destination buffer without change. Even * when user space uses an in-place cipher operation, the kernel * will copy the data as it does not see whether such in-place operation * is initiated. * * To ensure efficiency, the following implementation ensure that the * ciphers are invoked to perform a crypto operation in-place. This * is achieved by memory management specified as follows. |
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*/ |
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/* Use the RX SGL as source (and destination) for crypto op. */ |
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rsgl_src = areq->first_rsgl.sgl.sg; |
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if (ctx->enc) { /* * Encryption operation - The in-place cipher operation is * achieved by the following operation: * |
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* TX SGL: AAD || PT |
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* | | * | copy | * v v |
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* RX SGL: AAD || PT || Tag |
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*/ |
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err = crypto_aead_copy_sgl(null_tfm, tsgl_src, |
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areq->first_rsgl.sgl.sg, processed); if (err) goto free; |
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af_alg_pull_tsgl(sk, processed, NULL, 0); |
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} else { /* * Decryption operation - To achieve an in-place cipher * operation, the following SGL structure is used: * * TX SGL: AAD || CT || Tag * | | ^ * | copy | | Create SGL link. * v v | * RX SGL: AAD || CT ----+ */ /* Copy AAD || CT to RX SGL buffer for in-place operation. */ |
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err = crypto_aead_copy_sgl(null_tfm, tsgl_src, |
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areq->first_rsgl.sgl.sg, outlen); if (err) goto free; /* Create TX SGL for tag and chain it to RX SGL. */ |
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areq->tsgl_entries = af_alg_count_tsgl(sk, processed, processed - as); |
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if (!areq->tsgl_entries) areq->tsgl_entries = 1; areq->tsgl = sock_kmalloc(sk, sizeof(*areq->tsgl) * areq->tsgl_entries, GFP_KERNEL); if (!areq->tsgl) { err = -ENOMEM; goto free; } sg_init_table(areq->tsgl, areq->tsgl_entries); /* Release TX SGL, except for tag data and reassign tag data. */ |
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af_alg_pull_tsgl(sk, processed, areq->tsgl, processed - as); |
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/* chain the areq TX SGL holding the tag with RX SGL */ |
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if (usedpages) { |
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/* RX SGL present */ |
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struct af_alg_sgl *sgl_prev = &areq->last_rsgl->sgl; |
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sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1); sg_chain(sgl_prev->sg, sgl_prev->npages + 1, areq->tsgl); } else /* no RX SGL present (e.g. authentication only) */ |
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rsgl_src = areq->tsgl; |
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} |
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/* Initialize the crypto operation */ |
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aead_request_set_crypt(&areq->cra_u.aead_req, rsgl_src, |
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areq->first_rsgl.sgl.sg, used, ctx->iv); |
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aead_request_set_ad(&areq->cra_u.aead_req, ctx->aead_assoclen); aead_request_set_tfm(&areq->cra_u.aead_req, tfm); |
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if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) { /* AIO operation */ |
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sock_hold(sk); |
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areq->iocb = msg->msg_iocb; |
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/* Remember output size that will be generated. */ areq->outlen = outlen; |
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aead_request_set_callback(&areq->cra_u.aead_req, |
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CRYPTO_TFM_REQ_MAY_BACKLOG, |
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af_alg_async_cb, areq); err = ctx->enc ? crypto_aead_encrypt(&areq->cra_u.aead_req) : crypto_aead_decrypt(&areq->cra_u.aead_req); |
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/* AIO operation in progress */ |
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if (err == -EINPROGRESS || err == -EBUSY) |
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return -EIOCBQUEUED; |
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sock_put(sk); |
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} else { /* Synchronous operation */ |
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aead_request_set_callback(&areq->cra_u.aead_req, |
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CRYPTO_TFM_REQ_MAY_BACKLOG, af_alg_complete, &ctx->completion); err = af_alg_wait_for_completion(ctx->enc ? |
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crypto_aead_encrypt(&areq->cra_u.aead_req) : crypto_aead_decrypt(&areq->cra_u.aead_req), &ctx->completion); |
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} |
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free: |
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af_alg_free_resources(areq); |
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return err ? err : outlen; } |
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static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) |
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{ |
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struct sock *sk = sock->sk; int ret = 0; lock_sock(sk); while (msg_data_left(msg)) { int err = _aead_recvmsg(sock, msg, ignored, flags); /* * This error covers -EIOCBQUEUED which implies that we can * only handle one AIO request. If the caller wants to have * multiple AIO requests in parallel, he must make multiple * separate AIO calls. |
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* * Also return the error if no data has been processed so far. |
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*/ if (err <= 0) { |
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if (err == -EIOCBQUEUED || err == -EBADMSG || !ret) |
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ret = err; goto out; } ret += err; } out: |
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af_alg_wmem_wakeup(sk); |
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release_sock(sk); return ret; |
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} |
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static struct proto_ops algif_aead_ops = { .family = PF_ALG, .connect = sock_no_connect, .socketpair = sock_no_socketpair, .getname = sock_no_getname, .ioctl = sock_no_ioctl, .listen = sock_no_listen, .shutdown = sock_no_shutdown, .getsockopt = sock_no_getsockopt, .mmap = sock_no_mmap, .bind = sock_no_bind, .accept = sock_no_accept, .setsockopt = sock_no_setsockopt, .release = af_alg_release, .sendmsg = aead_sendmsg, |
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.sendpage = af_alg_sendpage, |
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.recvmsg = aead_recvmsg, |
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.poll = af_alg_poll, |
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}; |
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static int aead_check_key(struct socket *sock) { int err = 0; struct sock *psk; struct alg_sock *pask; struct aead_tfm *tfm; struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); lock_sock(sk); if (ask->refcnt) goto unlock_child; psk = ask->parent; pask = alg_sk(ask->parent); tfm = pask->private; err = -ENOKEY; lock_sock_nested(psk, SINGLE_DEPTH_NESTING); if (!tfm->has_key) goto unlock; if (!pask->refcnt++) sock_hold(psk); ask->refcnt = 1; sock_put(psk); err = 0; unlock: release_sock(psk); unlock_child: release_sock(sk); return err; } static int aead_sendmsg_nokey(struct socket *sock, struct msghdr *msg, size_t size) { int err; err = aead_check_key(sock); if (err) return err; return aead_sendmsg(sock, msg, size); } static ssize_t aead_sendpage_nokey(struct socket *sock, struct page *page, int offset, size_t size, int flags) { int err; err = aead_check_key(sock); if (err) return err; |
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return af_alg_sendpage(sock, page, offset, size, flags); |
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} static int aead_recvmsg_nokey(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) { int err; err = aead_check_key(sock); if (err) return err; return aead_recvmsg(sock, msg, ignored, flags); } static struct proto_ops algif_aead_ops_nokey = { .family = PF_ALG, .connect = sock_no_connect, .socketpair = sock_no_socketpair, .getname = sock_no_getname, .ioctl = sock_no_ioctl, .listen = sock_no_listen, .shutdown = sock_no_shutdown, .getsockopt = sock_no_getsockopt, .mmap = sock_no_mmap, .bind = sock_no_bind, .accept = sock_no_accept, .setsockopt = sock_no_setsockopt, .release = af_alg_release, .sendmsg = aead_sendmsg_nokey, .sendpage = aead_sendpage_nokey, .recvmsg = aead_recvmsg_nokey, |
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.poll = af_alg_poll, |
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}; |
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static void *aead_bind(const char *name, u32 type, u32 mask) { |
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struct aead_tfm *tfm; struct crypto_aead *aead; |
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struct crypto_skcipher *null_tfm; |
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tfm = kzalloc(sizeof(*tfm), GFP_KERNEL); if (!tfm) return ERR_PTR(-ENOMEM); aead = crypto_alloc_aead(name, type, mask); if (IS_ERR(aead)) { kfree(tfm); return ERR_CAST(aead); } |
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null_tfm = crypto_get_default_null_skcipher2(); if (IS_ERR(null_tfm)) { crypto_free_aead(aead); kfree(tfm); return ERR_CAST(null_tfm); } |
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tfm->aead = aead; |
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tfm->null_tfm = null_tfm; |
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return tfm; |
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} static void aead_release(void *private) { |
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struct aead_tfm *tfm = private; crypto_free_aead(tfm->aead); |
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crypto_put_default_null_skcipher2(); |
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kfree(tfm); |
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} static int aead_setauthsize(void *private, unsigned int authsize) { |
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struct aead_tfm *tfm = private; return crypto_aead_setauthsize(tfm->aead, authsize); |
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} static int aead_setkey(void *private, const u8 *key, unsigned int keylen) { |
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struct aead_tfm *tfm = private; int err; err = crypto_aead_setkey(tfm->aead, key, keylen); tfm->has_key = !err; return err; |
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} static void aead_sock_destruct(struct sock *sk) { struct alg_sock *ask = alg_sk(sk); |
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521 |
struct af_alg_ctx *ctx = ask->private; |
d887c52d6 crypto: algif_aea... |
522 523 524 525 526 |
struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); struct aead_tfm *aeadc = pask->private; struct crypto_aead *tfm = aeadc->aead; unsigned int ivlen = crypto_aead_ivsize(tfm); |
400c40cf7 crypto: algif - a... |
527 |
|
2d97591ef crypto: af_alg - ... |
528 |
af_alg_pull_tsgl(sk, ctx->used, NULL, 0); |
400c40cf7 crypto: algif - a... |
529 530 531 532 |
sock_kzfree_s(sk, ctx->iv, ivlen); sock_kfree_s(sk, ctx, ctx->len); af_alg_release_parent(sk); } |
2a2a251f1 crypto: algif_aea... |
533 |
static int aead_accept_parent_nokey(void *private, struct sock *sk) |
400c40cf7 crypto: algif - a... |
534 |
{ |
2d97591ef crypto: af_alg - ... |
535 |
struct af_alg_ctx *ctx; |
400c40cf7 crypto: algif - a... |
536 |
struct alg_sock *ask = alg_sk(sk); |
2a2a251f1 crypto: algif_aea... |
537 538 |
struct aead_tfm *tfm = private; struct crypto_aead *aead = tfm->aead; |
d887c52d6 crypto: algif_aea... |
539 |
unsigned int len = sizeof(*ctx); |
2a2a251f1 crypto: algif_aea... |
540 |
unsigned int ivlen = crypto_aead_ivsize(aead); |
400c40cf7 crypto: algif - a... |
541 542 543 544 545 546 547 548 549 550 551 552 |
ctx = sock_kmalloc(sk, len, GFP_KERNEL); if (!ctx) return -ENOMEM; memset(ctx, 0, len); ctx->iv = sock_kmalloc(sk, ivlen, GFP_KERNEL); if (!ctx->iv) { sock_kfree_s(sk, ctx, len); return -ENOMEM; } memset(ctx->iv, 0, ivlen); |
d887c52d6 crypto: algif_aea... |
553 |
INIT_LIST_HEAD(&ctx->tsgl_list); |
400c40cf7 crypto: algif - a... |
554 555 |
ctx->len = len; ctx->used = 0; |
36d0a678f crypto: af_alg - ... |
556 |
atomic_set(&ctx->rcvused, 0); |
400c40cf7 crypto: algif - a... |
557 558 559 |
ctx->more = 0; ctx->merge = 0; ctx->enc = 0; |
400c40cf7 crypto: algif - a... |
560 561 |
ctx->aead_assoclen = 0; af_alg_init_completion(&ctx->completion); |
400c40cf7 crypto: algif - a... |
562 563 |
ask->private = ctx; |
400c40cf7 crypto: algif - a... |
564 565 566 567 |
sk->sk_destruct = aead_sock_destruct; return 0; } |
2a2a251f1 crypto: algif_aea... |
568 569 570 571 572 573 574 575 576 |
static int aead_accept_parent(void *private, struct sock *sk) { struct aead_tfm *tfm = private; if (!tfm->has_key) return -ENOKEY; return aead_accept_parent_nokey(private, sk); } |
400c40cf7 crypto: algif - a... |
577 578 579 580 581 582 |
static const struct af_alg_type algif_type_aead = { .bind = aead_bind, .release = aead_release, .setkey = aead_setkey, .setauthsize = aead_setauthsize, .accept = aead_accept_parent, |
2a2a251f1 crypto: algif_aea... |
583 |
.accept_nokey = aead_accept_parent_nokey, |
400c40cf7 crypto: algif - a... |
584 |
.ops = &algif_aead_ops, |
2a2a251f1 crypto: algif_aea... |
585 |
.ops_nokey = &algif_aead_ops_nokey, |
400c40cf7 crypto: algif - a... |
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 |
.name = "aead", .owner = THIS_MODULE }; static int __init algif_aead_init(void) { return af_alg_register_type(&algif_type_aead); } static void __exit algif_aead_exit(void) { int err = af_alg_unregister_type(&algif_type_aead); BUG_ON(err); } module_init(algif_aead_init); module_exit(algif_aead_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Stephan Mueller <smueller@chronox.de>"); MODULE_DESCRIPTION("AEAD kernel crypto API user space interface"); |