mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 02:56:44 +07:00
689f1c9de2
While tracking down the MAX_AH_AUTH_LEN crash in an old kernel I thought that this limit was rather arbitrary and we should just get rid of it. In fact it seems that we've already done all the work needed to remove it apart from actually removing it. This limit was there in order to limit stack usage. Since we've already switched over to allocating scratch space using kmalloc, there is no longer any need to limit the authentication length. This patch kills all references to it, including the BUG_ONs that led me here. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
590 lines
14 KiB
C
590 lines
14 KiB
C
#define pr_fmt(fmt) "IPsec: " fmt
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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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/* Fall through */
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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, 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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skb_to_sgvec_nomark(skb, sg, 0, skb->len);
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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 == -EBUSY)
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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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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 = memcmp(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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goto out;
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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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skb_to_sgvec_nomark(skb, sg, 0, skb->len);
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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;
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}
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err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0;
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if (err)
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goto out_free;
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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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err = nexthdr;
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out_free:
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kfree (work_iph);
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out:
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return err;
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}
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static int ah4_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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const struct iphdr *iph = (const struct iphdr *)skb->data;
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struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
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struct xfrm_state *x;
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switch (icmp_hdr(skb)->type) {
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case ICMP_DEST_UNREACH:
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if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
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return 0;
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case ICMP_REDIRECT:
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break;
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default:
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return 0;
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}
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x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
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ah->spi, IPPROTO_AH, AF_INET);
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if (!x)
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return 0;
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if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
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ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_AH, 0);
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else
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ipv4_redirect(skb, net, 0, 0, IPPROTO_AH, 0);
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xfrm_state_put(x);
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return 0;
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}
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static int ah_init_state(struct xfrm_state *x)
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{
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struct ah_data *ahp = NULL;
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struct xfrm_algo_desc *aalg_desc;
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struct crypto_ahash *ahash;
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if (!x->aalg)
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goto error;
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if (x->encap)
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goto error;
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ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
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if (!ahp)
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return -ENOMEM;
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ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
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if (IS_ERR(ahash))
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goto error;
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ahp->ahash = ahash;
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if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
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(x->aalg->alg_key_len + 7) / 8))
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|
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)) {
|
|
pr_info("%s: %s digestsize %u != %hu\n",
|
|
__func__, x->aalg->alg_name,
|
|
crypto_ahash_digestsize(ahash),
|
|
aalg_desc->uinfo.auth.icv_fullbits / 8);
|
|
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 =
|
|
{
|
|
.description = "AH4",
|
|
.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__);
|
|
if (xfrm_unregister_type(&ah_type, AF_INET) < 0)
|
|
pr_info("%s: can't remove xfrm type\n", __func__);
|
|
}
|
|
|
|
module_init(ah4_init);
|
|
module_exit(ah4_fini);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_AH);
|