605 lines
14 KiB
C
605 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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#define pr_fmt(fmt) "IPsec: " fmt
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#include <crypto/algapi.h>
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#include <crypto/hash.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <net/ah.h>
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#include <linux/crypto.h>
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#include <linux/pfkeyv2.h>
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#include <linux/scatterlist.h>
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#include <net/icmp.h>
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#include <net/protocol.h>
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struct ah_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 AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
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static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
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unsigned int size)
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{
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unsigned int len;
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len = size + crypto_ahash_digestsize(ahash) +
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(crypto_ahash_alignmask(ahash) &
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~(crypto_tfm_ctx_alignment() - 1));
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len = ALIGN(len, crypto_tfm_ctx_alignment());
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len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
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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 *ah_tmp_auth(void *tmp, unsigned int offset)
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{
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return tmp + offset;
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}
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static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
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unsigned int offset)
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{
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return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
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}
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static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
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u8 *icv)
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{
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struct ahash_request *req;
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req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
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crypto_tfm_ctx_alignment());
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ahash_request_set_tfm(req, ahash);
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return req;
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}
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static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
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struct ahash_request *req)
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{
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return (void *)ALIGN((unsigned long)(req + 1) +
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crypto_ahash_reqsize(ahash),
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__alignof__(struct scatterlist));
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}
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/* Clear mutable options and find final destination to substitute
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* into IP header for icv calculation. Options are already checked
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* for validity, so paranoia is not required. */
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static int ip_clear_mutable_options(const struct iphdr *iph, __be32 *daddr)
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{
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unsigned char *optptr = (unsigned char *)(iph+1);
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int l = iph->ihl*4 - sizeof(struct iphdr);
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int optlen;
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while (l > 0) {
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switch (*optptr) {
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case IPOPT_END:
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return 0;
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case IPOPT_NOOP:
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l--;
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optptr++;
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continue;
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}
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optlen = optptr[1];
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if (optlen<2 || optlen>l)
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return -EINVAL;
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switch (*optptr) {
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case IPOPT_SEC:
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case 0x85: /* Some "Extended Security" crap. */
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case IPOPT_CIPSO:
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case IPOPT_RA:
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case 0x80|21: /* RFC1770 */
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break;
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case IPOPT_LSRR:
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case IPOPT_SSRR:
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if (optlen < 6)
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return -EINVAL;
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memcpy(daddr, optptr+optlen-4, 4);
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fallthrough;
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default:
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memset(optptr, 0, optlen);
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}
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l -= optlen;
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optptr += optlen;
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}
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return 0;
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}
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static void ah_output_done(struct crypto_async_request *base, int err)
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{
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u8 *icv;
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struct iphdr *iph;
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struct sk_buff *skb = base->data;
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struct xfrm_state *x = skb_dst(skb)->xfrm;
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struct ah_data *ahp = x->data;
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struct iphdr *top_iph = ip_hdr(skb);
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struct ip_auth_hdr *ah = ip_auth_hdr(skb);
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int ihl = ip_hdrlen(skb);
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iph = AH_SKB_CB(skb)->tmp;
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icv = ah_tmp_icv(ahp->ahash, iph, ihl);
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memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
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top_iph->tos = iph->tos;
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top_iph->ttl = iph->ttl;
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top_iph->frag_off = iph->frag_off;
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if (top_iph->ihl != 5) {
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top_iph->daddr = iph->daddr;
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memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
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}
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kfree(AH_SKB_CB(skb)->tmp);
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xfrm_output_resume(skb->sk, skb, err);
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}
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static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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int nfrags;
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int ihl;
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u8 *icv;
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struct sk_buff *trailer;
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struct crypto_ahash *ahash;
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struct ahash_request *req;
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struct scatterlist *sg;
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struct iphdr *iph, *top_iph;
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struct ip_auth_hdr *ah;
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struct ah_data *ahp;
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int seqhi_len = 0;
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__be32 *seqhi;
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int sglists = 0;
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struct scatterlist *seqhisg;
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ahp = x->data;
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ahash = ahp->ahash;
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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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skb_push(skb, -skb_network_offset(skb));
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ah = ip_auth_hdr(skb);
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ihl = ip_hdrlen(skb);
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if (x->props.flags & XFRM_STATE_ESN) {
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sglists = 1;
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seqhi_len = sizeof(*seqhi);
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}
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err = -ENOMEM;
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iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl + seqhi_len);
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if (!iph)
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goto out;
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seqhi = (__be32 *)((char *)iph + ihl);
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icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
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req = ah_tmp_req(ahash, icv);
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sg = ah_req_sg(ahash, req);
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seqhisg = sg + nfrags;
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memset(ah->auth_data, 0, ahp->icv_trunc_len);
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top_iph = ip_hdr(skb);
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iph->tos = top_iph->tos;
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iph->ttl = top_iph->ttl;
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iph->frag_off = top_iph->frag_off;
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if (top_iph->ihl != 5) {
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iph->daddr = top_iph->daddr;
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memcpy(iph+1, top_iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
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err = ip_clear_mutable_options(top_iph, &top_iph->daddr);
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if (err)
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goto out_free;
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}
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ah->nexthdr = *skb_mac_header(skb);
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*skb_mac_header(skb) = IPPROTO_AH;
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top_iph->tos = 0;
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top_iph->tot_len = htons(skb->len);
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top_iph->frag_off = 0;
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top_iph->ttl = 0;
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top_iph->check = 0;
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if (x->props.flags & XFRM_STATE_ALIGN4)
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ah->hdrlen = (XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
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else
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ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
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ah->reserved = 0;
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ah->spi = x->id.spi;
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ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
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sg_init_table(sg, nfrags + sglists);
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err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
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if (unlikely(err < 0))
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goto out_free;
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if (x->props.flags & XFRM_STATE_ESN) {
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/* Attach seqhi sg right after packet payload */
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*seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
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sg_set_buf(seqhisg, seqhi, seqhi_len);
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}
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ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
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ahash_request_set_callback(req, 0, ah_output_done, skb);
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AH_SKB_CB(skb)->tmp = iph;
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err = crypto_ahash_digest(req);
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if (err) {
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if (err == -EINPROGRESS)
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goto out;
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if (err == -ENOSPC)
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err = NET_XMIT_DROP;
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goto out_free;
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}
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memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
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top_iph->tos = iph->tos;
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top_iph->ttl = iph->ttl;
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top_iph->frag_off = iph->frag_off;
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if (top_iph->ihl != 5) {
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top_iph->daddr = iph->daddr;
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memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
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}
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out_free:
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kfree(iph);
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out:
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return err;
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}
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static void ah_input_done(struct crypto_async_request *base, int err)
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{
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u8 *auth_data;
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u8 *icv;
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struct iphdr *work_iph;
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struct sk_buff *skb = base->data;
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struct xfrm_state *x = xfrm_input_state(skb);
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struct ah_data *ahp = x->data;
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struct ip_auth_hdr *ah = ip_auth_hdr(skb);
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int ihl = ip_hdrlen(skb);
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int ah_hlen = (ah->hdrlen + 2) << 2;
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if (err)
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goto out;
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work_iph = AH_SKB_CB(skb)->tmp;
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auth_data = ah_tmp_auth(work_iph, ihl);
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icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
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err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
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if (err)
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goto out;
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err = ah->nexthdr;
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skb->network_header += ah_hlen;
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memcpy(skb_network_header(skb), work_iph, ihl);
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__skb_pull(skb, ah_hlen + ihl);
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if (x->props.mode == XFRM_MODE_TUNNEL)
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skb_reset_transport_header(skb);
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else
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skb_set_transport_header(skb, -ihl);
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out:
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kfree(AH_SKB_CB(skb)->tmp);
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xfrm_input_resume(skb, err);
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}
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static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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int ah_hlen;
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int ihl;
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int nexthdr;
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int nfrags;
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u8 *auth_data;
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u8 *icv;
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struct sk_buff *trailer;
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struct crypto_ahash *ahash;
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struct ahash_request *req;
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struct scatterlist *sg;
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struct iphdr *iph, *work_iph;
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struct ip_auth_hdr *ah;
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struct ah_data *ahp;
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int err = -ENOMEM;
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int seqhi_len = 0;
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__be32 *seqhi;
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int sglists = 0;
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struct scatterlist *seqhisg;
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if (!pskb_may_pull(skb, sizeof(*ah)))
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goto out;
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ah = (struct ip_auth_hdr *)skb->data;
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ahp = x->data;
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ahash = ahp->ahash;
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nexthdr = ah->nexthdr;
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ah_hlen = (ah->hdrlen + 2) << 2;
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if (x->props.flags & XFRM_STATE_ALIGN4) {
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if (ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_full_len) &&
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ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len))
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goto out;
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} else {
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if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
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ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len))
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goto out;
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}
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if (!pskb_may_pull(skb, ah_hlen))
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goto out;
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/* We are going to _remove_ AH header to keep sockets happy,
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* so... Later this can change. */
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if (skb_unclone(skb, GFP_ATOMIC))
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goto out;
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skb->ip_summed = CHECKSUM_NONE;
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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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ah = (struct ip_auth_hdr *)skb->data;
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iph = ip_hdr(skb);
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ihl = ip_hdrlen(skb);
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if (x->props.flags & XFRM_STATE_ESN) {
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sglists = 1;
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seqhi_len = sizeof(*seqhi);
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}
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work_iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl +
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ahp->icv_trunc_len + seqhi_len);
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if (!work_iph) {
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err = -ENOMEM;
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goto out;
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}
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seqhi = (__be32 *)((char *)work_iph + ihl);
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auth_data = ah_tmp_auth(seqhi, seqhi_len);
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icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
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req = ah_tmp_req(ahash, icv);
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sg = ah_req_sg(ahash, req);
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seqhisg = sg + nfrags;
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memcpy(work_iph, iph, ihl);
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memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
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memset(ah->auth_data, 0, ahp->icv_trunc_len);
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iph->ttl = 0;
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iph->tos = 0;
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iph->frag_off = 0;
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iph->check = 0;
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if (ihl > sizeof(*iph)) {
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__be32 dummy;
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err = ip_clear_mutable_options(iph, &dummy);
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if (err)
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goto out_free;
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}
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skb_push(skb, ihl);
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sg_init_table(sg, nfrags + sglists);
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err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
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if (unlikely(err < 0))
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goto out_free;
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if (x->props.flags & XFRM_STATE_ESN) {
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/* Attach seqhi sg right after packet payload */
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*seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
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sg_set_buf(seqhisg, seqhi, seqhi_len);
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}
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ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
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ahash_request_set_callback(req, 0, ah_input_done, skb);
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AH_SKB_CB(skb)->tmp = work_iph;
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err = crypto_ahash_digest(req);
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if (err) {
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if (err == -EINPROGRESS)
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goto out;
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||
|
goto out_free;
|
||
|
}
|
||
|
|
||
|
err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
|
||
|
if (err)
|
||
|
goto out_free;
|
||
|
|
||
|
skb->network_header += ah_hlen;
|
||
|
memcpy(skb_network_header(skb), work_iph, ihl);
|
||
|
__skb_pull(skb, ah_hlen + ihl);
|
||
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
||
|
skb_reset_transport_header(skb);
|
||
|
else
|
||
|
skb_set_transport_header(skb, -ihl);
|
||
|
|
||
|
err = nexthdr;
|
||
|
|
||
|
out_free:
|
||
|
kfree (work_iph);
|
||
|
out:
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
static int ah4_err(struct sk_buff *skb, u32 info)
|
||
|
{
|
||
|
struct net *net = dev_net(skb->dev);
|
||
|
const struct iphdr *iph = (const struct iphdr *)skb->data;
|
||
|
struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
|
||
|
struct xfrm_state *x;
|
||
|
|
||
|
switch (icmp_hdr(skb)->type) {
|
||
|
case ICMP_DEST_UNREACH:
|
||
|
if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
|
||
|
return 0;
|
||
|
break;
|
||
|
case ICMP_REDIRECT:
|
||
|
break;
|
||
|
default:
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
|
||
|
ah->spi, IPPROTO_AH, AF_INET);
|
||
|
if (!x)
|
||
|
return 0;
|
||
|
|
||
|
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
|
||
|
ipv4_update_pmtu(skb, net, info, 0, IPPROTO_AH);
|
||
|
else
|
||
|
ipv4_redirect(skb, net, 0, IPPROTO_AH);
|
||
|
xfrm_state_put(x);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int ah_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)
|
||
|
{
|
||
|
struct ah_data *ahp = NULL;
|
||
|
struct xfrm_algo_desc *aalg_desc;
|
||
|
struct crypto_ahash *ahash;
|
||
|
|
||
|
if (!x->aalg) {
|
||
|
NL_SET_ERR_MSG(extack, "AH requires a state with an AUTH algorithm");
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
if (x->encap) {
|
||
|
NL_SET_ERR_MSG(extack, "AH is not compatible with encapsulation");
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
|
||
|
if (!ahp)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
|
||
|
if (IS_ERR(ahash)) {
|
||
|
NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
ahp->ahash = ahash;
|
||
|
if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
|
||
|
(x->aalg->alg_key_len + 7) / 8)) {
|
||
|
NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Lookup the algorithm description maintained by xfrm_algo,
|
||
|
* verify crypto transform properties, and store information
|
||
|
* we need for AH processing. This lookup cannot fail here
|
||
|
* after a successful crypto_alloc_ahash().
|
||
|
*/
|
||
|
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
|
||
|
BUG_ON(!aalg_desc);
|
||
|
|
||
|
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
|
||
|
crypto_ahash_digestsize(ahash)) {
|
||
|
NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
|
||
|
ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;
|
||
|
|
||
|
if (x->props.flags & XFRM_STATE_ALIGN4)
|
||
|
x->props.header_len = XFRM_ALIGN4(sizeof(struct ip_auth_hdr) +
|
||
|
ahp->icv_trunc_len);
|
||
|
else
|
||
|
x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
|
||
|
ahp->icv_trunc_len);
|
||
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
||
|
x->props.header_len += sizeof(struct iphdr);
|
||
|
x->data = ahp;
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
error:
|
||
|
if (ahp) {
|
||
|
crypto_free_ahash(ahp->ahash);
|
||
|
kfree(ahp);
|
||
|
}
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
static void ah_destroy(struct xfrm_state *x)
|
||
|
{
|
||
|
struct ah_data *ahp = x->data;
|
||
|
|
||
|
if (!ahp)
|
||
|
return;
|
||
|
|
||
|
crypto_free_ahash(ahp->ahash);
|
||
|
kfree(ahp);
|
||
|
}
|
||
|
|
||
|
static int ah4_rcv_cb(struct sk_buff *skb, int err)
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static const struct xfrm_type ah_type =
|
||
|
{
|
||
|
.owner = THIS_MODULE,
|
||
|
.proto = IPPROTO_AH,
|
||
|
.flags = XFRM_TYPE_REPLAY_PROT,
|
||
|
.init_state = ah_init_state,
|
||
|
.destructor = ah_destroy,
|
||
|
.input = ah_input,
|
||
|
.output = ah_output
|
||
|
};
|
||
|
|
||
|
static struct xfrm4_protocol ah4_protocol = {
|
||
|
.handler = xfrm4_rcv,
|
||
|
.input_handler = xfrm_input,
|
||
|
.cb_handler = ah4_rcv_cb,
|
||
|
.err_handler = ah4_err,
|
||
|
.priority = 0,
|
||
|
};
|
||
|
|
||
|
static int __init ah4_init(void)
|
||
|
{
|
||
|
if (xfrm_register_type(&ah_type, AF_INET) < 0) {
|
||
|
pr_info("%s: can't add xfrm type\n", __func__);
|
||
|
return -EAGAIN;
|
||
|
}
|
||
|
if (xfrm4_protocol_register(&ah4_protocol, IPPROTO_AH) < 0) {
|
||
|
pr_info("%s: can't add protocol\n", __func__);
|
||
|
xfrm_unregister_type(&ah_type, AF_INET);
|
||
|
return -EAGAIN;
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void __exit ah4_fini(void)
|
||
|
{
|
||
|
if (xfrm4_protocol_deregister(&ah4_protocol, IPPROTO_AH) < 0)
|
||
|
pr_info("%s: can't remove protocol\n", __func__);
|
||
|
xfrm_unregister_type(&ah_type, AF_INET);
|
||
|
}
|
||
|
|
||
|
module_init(ah4_init);
|
||
|
module_exit(ah4_fini);
|
||
|
MODULE_LICENSE("GPL");
|
||
|
MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_AH);
|