![Martin Willi](/assets/img/avatar_default.png)
Instead of using the hardcoded truncation for authentication algorithms, use the truncation length specified on xfrm_state. Signed-off-by: Martin Willi <martin@strongswan.org> Signed-off-by: David S. Miller <davem@davemloft.net>
651 lines
15 KiB
C
651 lines
15 KiB
C
#include <crypto/aead.h>
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#include <crypto/authenc.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <net/esp.h>
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#include <linux/scatterlist.h>
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#include <linux/kernel.h>
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#include <linux/pfkeyv2.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/in6.h>
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#include <net/icmp.h>
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#include <net/protocol.h>
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#include <net/udp.h>
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struct esp_skb_cb {
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struct xfrm_skb_cb xfrm;
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void *tmp;
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};
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#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
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/*
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* Allocate an AEAD request structure with extra space for SG and IV.
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*
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* For alignment considerations the IV is placed at the front, followed
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* by the request and finally the SG list.
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*
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* TODO: Use spare space in skb for this where possible.
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*/
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static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags)
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{
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unsigned int len;
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len = crypto_aead_ivsize(aead);
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if (len) {
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len += crypto_aead_alignmask(aead) &
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~(crypto_tfm_ctx_alignment() - 1);
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len = ALIGN(len, crypto_tfm_ctx_alignment());
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}
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len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead);
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len = ALIGN(len, __alignof__(struct scatterlist));
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len += sizeof(struct scatterlist) * nfrags;
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return kmalloc(len, GFP_ATOMIC);
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}
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static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp)
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{
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return crypto_aead_ivsize(aead) ?
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PTR_ALIGN((u8 *)tmp, crypto_aead_alignmask(aead) + 1) : tmp;
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}
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static inline struct aead_givcrypt_request *esp_tmp_givreq(
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struct crypto_aead *aead, u8 *iv)
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{
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struct aead_givcrypt_request *req;
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req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
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crypto_tfm_ctx_alignment());
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aead_givcrypt_set_tfm(req, aead);
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return req;
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}
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static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
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{
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struct aead_request *req;
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req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
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crypto_tfm_ctx_alignment());
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aead_request_set_tfm(req, aead);
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return req;
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}
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static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
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struct aead_request *req)
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{
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return (void *)ALIGN((unsigned long)(req + 1) +
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crypto_aead_reqsize(aead),
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__alignof__(struct scatterlist));
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}
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static inline struct scatterlist *esp_givreq_sg(
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struct crypto_aead *aead, struct aead_givcrypt_request *req)
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{
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return (void *)ALIGN((unsigned long)(req + 1) +
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crypto_aead_reqsize(aead),
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__alignof__(struct scatterlist));
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}
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static void esp_output_done(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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kfree(ESP_SKB_CB(skb)->tmp);
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xfrm_output_resume(skb, err);
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}
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static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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struct ip_esp_hdr *esph;
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struct crypto_aead *aead;
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struct aead_givcrypt_request *req;
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struct scatterlist *sg;
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struct scatterlist *asg;
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struct esp_data *esp;
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struct sk_buff *trailer;
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void *tmp;
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u8 *iv;
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u8 *tail;
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int blksize;
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int clen;
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int alen;
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int nfrags;
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/* skb is pure payload to encrypt */
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err = -ENOMEM;
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/* Round to block size */
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clen = skb->len;
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esp = x->data;
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aead = esp->aead;
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alen = crypto_aead_authsize(aead);
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blksize = ALIGN(crypto_aead_blocksize(aead), 4);
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clen = ALIGN(clen + 2, blksize);
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if (esp->padlen)
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clen = ALIGN(clen, esp->padlen);
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if ((err = skb_cow_data(skb, clen - skb->len + alen, &trailer)) < 0)
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goto error;
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nfrags = err;
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tmp = esp_alloc_tmp(aead, nfrags + 1);
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if (!tmp)
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goto error;
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iv = esp_tmp_iv(aead, tmp);
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req = esp_tmp_givreq(aead, iv);
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asg = esp_givreq_sg(aead, req);
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sg = asg + 1;
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/* Fill padding... */
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tail = skb_tail_pointer(trailer);
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do {
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int i;
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for (i=0; i<clen-skb->len - 2; i++)
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tail[i] = i + 1;
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} while (0);
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tail[clen - skb->len - 2] = (clen - skb->len) - 2;
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tail[clen - skb->len - 1] = *skb_mac_header(skb);
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pskb_put(skb, trailer, clen - skb->len + alen);
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skb_push(skb, -skb_network_offset(skb));
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esph = ip_esp_hdr(skb);
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*skb_mac_header(skb) = IPPROTO_ESP;
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/* this is non-NULL only with UDP Encapsulation */
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if (x->encap) {
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struct xfrm_encap_tmpl *encap = x->encap;
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struct udphdr *uh;
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__be32 *udpdata32;
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__be16 sport, dport;
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int encap_type;
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spin_lock_bh(&x->lock);
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sport = encap->encap_sport;
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dport = encap->encap_dport;
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encap_type = encap->encap_type;
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spin_unlock_bh(&x->lock);
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uh = (struct udphdr *)esph;
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uh->source = sport;
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uh->dest = dport;
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uh->len = htons(skb->len - skb_transport_offset(skb));
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uh->check = 0;
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switch (encap_type) {
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default:
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case UDP_ENCAP_ESPINUDP:
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esph = (struct ip_esp_hdr *)(uh + 1);
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break;
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case UDP_ENCAP_ESPINUDP_NON_IKE:
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udpdata32 = (__be32 *)(uh + 1);
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udpdata32[0] = udpdata32[1] = 0;
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esph = (struct ip_esp_hdr *)(udpdata32 + 2);
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break;
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}
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*skb_mac_header(skb) = IPPROTO_UDP;
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}
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esph->spi = x->id.spi;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg,
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esph->enc_data + crypto_aead_ivsize(aead) - skb->data,
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clen + alen);
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sg_init_one(asg, esph, sizeof(*esph));
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aead_givcrypt_set_callback(req, 0, esp_output_done, skb);
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aead_givcrypt_set_crypt(req, sg, sg, clen, iv);
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aead_givcrypt_set_assoc(req, asg, sizeof(*esph));
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aead_givcrypt_set_giv(req, esph->enc_data,
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XFRM_SKB_CB(skb)->seq.output);
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ESP_SKB_CB(skb)->tmp = tmp;
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err = crypto_aead_givencrypt(req);
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if (err == -EINPROGRESS)
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goto error;
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if (err == -EBUSY)
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err = NET_XMIT_DROP;
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kfree(tmp);
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error:
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return err;
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}
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static int esp_input_done2(struct sk_buff *skb, int err)
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{
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struct iphdr *iph;
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struct xfrm_state *x = xfrm_input_state(skb);
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struct esp_data *esp = x->data;
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struct crypto_aead *aead = esp->aead;
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int alen = crypto_aead_authsize(aead);
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int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
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int elen = skb->len - hlen;
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int ihl;
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u8 nexthdr[2];
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int padlen;
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kfree(ESP_SKB_CB(skb)->tmp);
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if (unlikely(err))
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goto out;
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if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
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BUG();
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err = -EINVAL;
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padlen = nexthdr[0];
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if (padlen + 2 + alen >= elen)
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goto out;
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/* ... check padding bits here. Silly. :-) */
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iph = ip_hdr(skb);
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ihl = iph->ihl * 4;
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if (x->encap) {
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struct xfrm_encap_tmpl *encap = x->encap;
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struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
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/*
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* 1) if the NAT-T peer's IP or port changed then
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* advertize the change to the keying daemon.
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* This is an inbound SA, so just compare
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* SRC ports.
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*/
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if (iph->saddr != x->props.saddr.a4 ||
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uh->source != encap->encap_sport) {
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xfrm_address_t ipaddr;
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ipaddr.a4 = iph->saddr;
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km_new_mapping(x, &ipaddr, uh->source);
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/* XXX: perhaps add an extra
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* policy check here, to see
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* if we should allow or
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* reject a packet from a
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* different source
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* address/port.
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*/
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}
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/*
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* 2) ignore UDP/TCP checksums in case
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* of NAT-T in Transport Mode, or
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* perform other post-processing fixes
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* as per draft-ietf-ipsec-udp-encaps-06,
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* section 3.1.2
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*/
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if (x->props.mode == XFRM_MODE_TRANSPORT)
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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}
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pskb_trim(skb, skb->len - alen - padlen - 2);
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__skb_pull(skb, hlen);
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skb_set_transport_header(skb, -ihl);
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err = nexthdr[1];
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/* RFC4303: Drop dummy packets without any error */
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if (err == IPPROTO_NONE)
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err = -EINVAL;
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out:
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return err;
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}
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static void esp_input_done(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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xfrm_input_resume(skb, esp_input_done2(skb, err));
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}
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/*
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* Note: detecting truncated vs. non-truncated authentication data is very
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* expensive, so we only support truncated data, which is the recommended
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* and common case.
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*/
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static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ip_esp_hdr *esph;
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struct esp_data *esp = x->data;
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struct crypto_aead *aead = esp->aead;
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struct aead_request *req;
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struct sk_buff *trailer;
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int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead);
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int nfrags;
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void *tmp;
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u8 *iv;
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struct scatterlist *sg;
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struct scatterlist *asg;
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int err = -EINVAL;
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if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
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goto out;
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if (elen <= 0)
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goto out;
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if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
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goto out;
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nfrags = err;
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err = -ENOMEM;
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tmp = esp_alloc_tmp(aead, nfrags + 1);
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if (!tmp)
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goto out;
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ESP_SKB_CB(skb)->tmp = tmp;
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iv = esp_tmp_iv(aead, tmp);
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req = esp_tmp_req(aead, iv);
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asg = esp_req_sg(aead, req);
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sg = asg + 1;
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skb->ip_summed = CHECKSUM_NONE;
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esph = (struct ip_esp_hdr *)skb->data;
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/* Get ivec. This can be wrong, check against another impls. */
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iv = esph->enc_data;
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen);
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sg_init_one(asg, esph, sizeof(*esph));
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aead_request_set_callback(req, 0, esp_input_done, skb);
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aead_request_set_crypt(req, sg, sg, elen, iv);
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aead_request_set_assoc(req, asg, sizeof(*esph));
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err = crypto_aead_decrypt(req);
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if (err == -EINPROGRESS)
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goto out;
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err = esp_input_done2(skb, err);
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out:
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return err;
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}
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static u32 esp4_get_mtu(struct xfrm_state *x, int mtu)
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{
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struct esp_data *esp = x->data;
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u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4);
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u32 align = max_t(u32, blksize, esp->padlen);
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u32 rem;
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mtu -= x->props.header_len + crypto_aead_authsize(esp->aead);
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rem = mtu & (align - 1);
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mtu &= ~(align - 1);
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switch (x->props.mode) {
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case XFRM_MODE_TUNNEL:
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break;
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default:
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case XFRM_MODE_TRANSPORT:
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/* The worst case */
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mtu -= blksize - 4;
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mtu += min_t(u32, blksize - 4, rem);
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break;
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case XFRM_MODE_BEET:
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/* The worst case. */
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mtu += min_t(u32, IPV4_BEET_PHMAXLEN, rem);
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break;
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}
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return mtu - 2;
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}
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static void esp4_err(struct sk_buff *skb, u32 info)
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{
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struct net *net = dev_net(skb->dev);
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struct iphdr *iph = (struct iphdr *)skb->data;
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struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
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struct xfrm_state *x;
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if (icmp_hdr(skb)->type != ICMP_DEST_UNREACH ||
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icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
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return;
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x = xfrm_state_lookup(net, (xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET);
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if (!x)
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return;
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NETDEBUG(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%08x\n",
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ntohl(esph->spi), ntohl(iph->daddr));
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xfrm_state_put(x);
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}
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static void esp_destroy(struct xfrm_state *x)
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{
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struct esp_data *esp = x->data;
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if (!esp)
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return;
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crypto_free_aead(esp->aead);
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kfree(esp);
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}
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static int esp_init_aead(struct xfrm_state *x)
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{
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struct esp_data *esp = x->data;
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struct crypto_aead *aead;
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int err;
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aead = crypto_alloc_aead(x->aead->alg_name, 0, 0);
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err = PTR_ERR(aead);
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if (IS_ERR(aead))
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goto error;
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esp->aead = aead;
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err = crypto_aead_setkey(aead, x->aead->alg_key,
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(x->aead->alg_key_len + 7) / 8);
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if (err)
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goto error;
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err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
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if (err)
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goto error;
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error:
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return err;
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}
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static int esp_init_authenc(struct xfrm_state *x)
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{
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struct esp_data *esp = x->data;
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struct crypto_aead *aead;
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struct crypto_authenc_key_param *param;
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struct rtattr *rta;
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char *key;
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char *p;
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char authenc_name[CRYPTO_MAX_ALG_NAME];
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unsigned int keylen;
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int err;
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err = -EINVAL;
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if (x->ealg == NULL)
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goto error;
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err = -ENAMETOOLONG;
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if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, "authenc(%s,%s)",
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x->aalg ? x->aalg->alg_name : "digest_null",
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x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
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goto error;
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aead = crypto_alloc_aead(authenc_name, 0, 0);
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err = PTR_ERR(aead);
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if (IS_ERR(aead))
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goto error;
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esp->aead = aead;
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keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
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(x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
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err = -ENOMEM;
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key = kmalloc(keylen, GFP_KERNEL);
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if (!key)
|
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goto error;
|
|
|
|
p = key;
|
|
rta = (void *)p;
|
|
rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
|
|
rta->rta_len = RTA_LENGTH(sizeof(*param));
|
|
param = RTA_DATA(rta);
|
|
p += RTA_SPACE(sizeof(*param));
|
|
|
|
if (x->aalg) {
|
|
struct xfrm_algo_desc *aalg_desc;
|
|
|
|
memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
|
|
p += (x->aalg->alg_key_len + 7) / 8;
|
|
|
|
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
|
|
BUG_ON(!aalg_desc);
|
|
|
|
err = -EINVAL;
|
|
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
|
|
crypto_aead_authsize(aead)) {
|
|
NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n",
|
|
x->aalg->alg_name,
|
|
crypto_aead_authsize(aead),
|
|
aalg_desc->uinfo.auth.icv_fullbits/8);
|
|
goto free_key;
|
|
}
|
|
|
|
err = crypto_aead_setauthsize(
|
|
aead, x->aalg->alg_trunc_len / 8);
|
|
if (err)
|
|
goto free_key;
|
|
}
|
|
|
|
param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
|
|
memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
|
|
|
|
err = crypto_aead_setkey(aead, key, keylen);
|
|
|
|
free_key:
|
|
kfree(key);
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
|
|
static int esp_init_state(struct xfrm_state *x)
|
|
{
|
|
struct esp_data *esp;
|
|
struct crypto_aead *aead;
|
|
u32 align;
|
|
int err;
|
|
|
|
esp = kzalloc(sizeof(*esp), GFP_KERNEL);
|
|
if (esp == NULL)
|
|
return -ENOMEM;
|
|
|
|
x->data = esp;
|
|
|
|
if (x->aead)
|
|
err = esp_init_aead(x);
|
|
else
|
|
err = esp_init_authenc(x);
|
|
|
|
if (err)
|
|
goto error;
|
|
|
|
aead = esp->aead;
|
|
|
|
esp->padlen = 0;
|
|
|
|
x->props.header_len = sizeof(struct ip_esp_hdr) +
|
|
crypto_aead_ivsize(aead);
|
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
|
x->props.header_len += sizeof(struct iphdr);
|
|
else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6)
|
|
x->props.header_len += IPV4_BEET_PHMAXLEN;
|
|
if (x->encap) {
|
|
struct xfrm_encap_tmpl *encap = x->encap;
|
|
|
|
switch (encap->encap_type) {
|
|
default:
|
|
goto error;
|
|
case UDP_ENCAP_ESPINUDP:
|
|
x->props.header_len += sizeof(struct udphdr);
|
|
break;
|
|
case UDP_ENCAP_ESPINUDP_NON_IKE:
|
|
x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
|
|
break;
|
|
}
|
|
}
|
|
|
|
align = ALIGN(crypto_aead_blocksize(aead), 4);
|
|
if (esp->padlen)
|
|
align = max_t(u32, align, esp->padlen);
|
|
x->props.trailer_len = align + 1 + crypto_aead_authsize(esp->aead);
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
|
|
static const struct xfrm_type esp_type =
|
|
{
|
|
.description = "ESP4",
|
|
.owner = THIS_MODULE,
|
|
.proto = IPPROTO_ESP,
|
|
.flags = XFRM_TYPE_REPLAY_PROT,
|
|
.init_state = esp_init_state,
|
|
.destructor = esp_destroy,
|
|
.get_mtu = esp4_get_mtu,
|
|
.input = esp_input,
|
|
.output = esp_output
|
|
};
|
|
|
|
static const struct net_protocol esp4_protocol = {
|
|
.handler = xfrm4_rcv,
|
|
.err_handler = esp4_err,
|
|
.no_policy = 1,
|
|
.netns_ok = 1,
|
|
};
|
|
|
|
static int __init esp4_init(void)
|
|
{
|
|
if (xfrm_register_type(&esp_type, AF_INET) < 0) {
|
|
printk(KERN_INFO "ip esp init: can't add xfrm type\n");
|
|
return -EAGAIN;
|
|
}
|
|
if (inet_add_protocol(&esp4_protocol, IPPROTO_ESP) < 0) {
|
|
printk(KERN_INFO "ip esp init: can't add protocol\n");
|
|
xfrm_unregister_type(&esp_type, AF_INET);
|
|
return -EAGAIN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __exit esp4_fini(void)
|
|
{
|
|
if (inet_del_protocol(&esp4_protocol, IPPROTO_ESP) < 0)
|
|
printk(KERN_INFO "ip esp close: can't remove protocol\n");
|
|
if (xfrm_unregister_type(&esp_type, AF_INET) < 0)
|
|
printk(KERN_INFO "ip esp close: can't remove xfrm type\n");
|
|
}
|
|
|
|
module_init(esp4_init);
|
|
module_exit(esp4_fini);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP);
|