From f6b7b5f4f3bcd7e1897c16dd65a10cbcc159cbde Mon Sep 17 00:00:00 2001 From: Fernando Fernandez Mancera Date: Wed, 25 Jul 2018 01:32:44 +0200 Subject: netfilter: nf_osf: rename nf_osf.c to nfnetlink_osf.c Rename nf_osf.c to nfnetlink_osf.c as we introduce nfnetlink_osf which is the OSF infraestructure. Signed-off-by: Fernando Fernandez Mancera Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nfnetlink_osf.c | 282 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 282 insertions(+) create mode 100644 net/netfilter/nfnetlink_osf.c (limited to 'net/netfilter/nfnetlink_osf.c') diff --git a/net/netfilter/nfnetlink_osf.c b/net/netfilter/nfnetlink_osf.c new file mode 100644 index 000000000000..f4c75e982902 --- /dev/null +++ b/net/netfilter/nfnetlink_osf.c @@ -0,0 +1,282 @@ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include + +static inline int nf_osf_ttl(const struct sk_buff *skb, + int ttl_check, unsigned char f_ttl) +{ + const struct iphdr *ip = ip_hdr(skb); + + if (ttl_check != -1) { + if (ttl_check == NF_OSF_TTL_TRUE) + return ip->ttl == f_ttl; + if (ttl_check == NF_OSF_TTL_NOCHECK) + return 1; + else if (ip->ttl <= f_ttl) + return 1; + else { + struct in_device *in_dev = __in_dev_get_rcu(skb->dev); + int ret = 0; + + for_ifa(in_dev) { + if (inet_ifa_match(ip->saddr, ifa)) { + ret = (ip->ttl == f_ttl); + break; + } + } + endfor_ifa(in_dev); + + return ret; + } + } + + return ip->ttl == f_ttl; +} + +struct nf_osf_hdr_ctx { + bool df; + u16 window; + u16 totlen; + const unsigned char *optp; + unsigned int optsize; +}; + +static bool nf_osf_match_one(const struct sk_buff *skb, + const struct nf_osf_user_finger *f, + int ttl_check, + struct nf_osf_hdr_ctx *ctx) +{ + unsigned int check_WSS = 0; + int fmatch = FMATCH_WRONG; + int foptsize, optnum; + u16 mss = 0; + + if (ctx->totlen != f->ss || !nf_osf_ttl(skb, ttl_check, f->ttl)) + return false; + + /* + * Should not happen if userspace parser was written correctly. + */ + if (f->wss.wc >= OSF_WSS_MAX) + return false; + + /* Check options */ + + foptsize = 0; + for (optnum = 0; optnum < f->opt_num; ++optnum) + foptsize += f->opt[optnum].length; + + if (foptsize > MAX_IPOPTLEN || + ctx->optsize > MAX_IPOPTLEN || + ctx->optsize != foptsize) + return false; + + check_WSS = f->wss.wc; + + for (optnum = 0; optnum < f->opt_num; ++optnum) { + if (f->opt[optnum].kind == *ctx->optp) { + __u32 len = f->opt[optnum].length; + const __u8 *optend = ctx->optp + len; + + fmatch = FMATCH_OK; + + switch (*ctx->optp) { + case OSFOPT_MSS: + mss = ctx->optp[3]; + mss <<= 8; + mss |= ctx->optp[2]; + + mss = ntohs((__force __be16)mss); + break; + case OSFOPT_TS: + break; + } + + ctx->optp = optend; + } else + fmatch = FMATCH_OPT_WRONG; + + if (fmatch != FMATCH_OK) + break; + } + + if (fmatch != FMATCH_OPT_WRONG) { + fmatch = FMATCH_WRONG; + + switch (check_WSS) { + case OSF_WSS_PLAIN: + if (f->wss.val == 0 || ctx->window == f->wss.val) + fmatch = FMATCH_OK; + break; + case OSF_WSS_MSS: + /* + * Some smart modems decrease mangle MSS to + * SMART_MSS_2, so we check standard, decreased + * and the one provided in the fingerprint MSS + * values. + */ +#define SMART_MSS_1 1460 +#define SMART_MSS_2 1448 + if (ctx->window == f->wss.val * mss || + ctx->window == f->wss.val * SMART_MSS_1 || + ctx->window == f->wss.val * SMART_MSS_2) + fmatch = FMATCH_OK; + break; + case OSF_WSS_MTU: + if (ctx->window == f->wss.val * (mss + 40) || + ctx->window == f->wss.val * (SMART_MSS_1 + 40) || + ctx->window == f->wss.val * (SMART_MSS_2 + 40)) + fmatch = FMATCH_OK; + break; + case OSF_WSS_MODULO: + if ((ctx->window % f->wss.val) == 0) + fmatch = FMATCH_OK; + break; + } + } + + return fmatch == FMATCH_OK; +} + +static const struct tcphdr *nf_osf_hdr_ctx_init(struct nf_osf_hdr_ctx *ctx, + const struct sk_buff *skb, + const struct iphdr *ip, + unsigned char *opts) +{ + const struct tcphdr *tcp; + struct tcphdr _tcph; + + tcp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(struct tcphdr), &_tcph); + if (!tcp) + return NULL; + + if (!tcp->syn) + return NULL; + + ctx->totlen = ntohs(ip->tot_len); + ctx->df = ntohs(ip->frag_off) & IP_DF; + ctx->window = ntohs(tcp->window); + + if (tcp->doff * 4 > sizeof(struct tcphdr)) { + ctx->optsize = tcp->doff * 4 - sizeof(struct tcphdr); + + ctx->optp = skb_header_pointer(skb, ip_hdrlen(skb) + + sizeof(struct tcphdr), ctx->optsize, opts); + } + + return tcp; +} + +bool +nf_osf_match(const struct sk_buff *skb, u_int8_t family, + int hooknum, struct net_device *in, struct net_device *out, + const struct nf_osf_info *info, struct net *net, + const struct list_head *nf_osf_fingers) +{ + const struct iphdr *ip = ip_hdr(skb); + const struct nf_osf_user_finger *f; + unsigned char opts[MAX_IPOPTLEN]; + const struct nf_osf_finger *kf; + int fcount = 0, ttl_check; + int fmatch = FMATCH_WRONG; + struct nf_osf_hdr_ctx ctx; + const struct tcphdr *tcp; + + memset(&ctx, 0, sizeof(ctx)); + + tcp = nf_osf_hdr_ctx_init(&ctx, skb, ip, opts); + if (!tcp) + return false; + + ttl_check = (info->flags & NF_OSF_TTL) ? info->ttl : -1; + + list_for_each_entry_rcu(kf, &nf_osf_fingers[ctx.df], finger_entry) { + + f = &kf->finger; + + if (!(info->flags & NF_OSF_LOG) && strcmp(info->genre, f->genre)) + continue; + + if (!nf_osf_match_one(skb, f, ttl_check, &ctx)) + continue; + + fmatch = FMATCH_OK; + + fcount++; + + if (info->flags & NF_OSF_LOG) + nf_log_packet(net, family, hooknum, skb, + in, out, NULL, + "%s [%s:%s] : %pI4:%d -> %pI4:%d hops=%d\n", + f->genre, f->version, f->subtype, + &ip->saddr, ntohs(tcp->source), + &ip->daddr, ntohs(tcp->dest), + f->ttl - ip->ttl); + + if ((info->flags & NF_OSF_LOG) && + info->loglevel == NF_OSF_LOGLEVEL_FIRST) + break; + } + + if (!fcount && (info->flags & NF_OSF_LOG)) + nf_log_packet(net, family, hooknum, skb, in, out, NULL, + "Remote OS is not known: %pI4:%u -> %pI4:%u\n", + &ip->saddr, ntohs(tcp->source), + &ip->daddr, ntohs(tcp->dest)); + + if (fcount) + fmatch = FMATCH_OK; + + return fmatch == FMATCH_OK; +} +EXPORT_SYMBOL_GPL(nf_osf_match); + +const char *nf_osf_find(const struct sk_buff *skb, + const struct list_head *nf_osf_fingers) +{ + const struct iphdr *ip = ip_hdr(skb); + const struct nf_osf_user_finger *f; + unsigned char opts[MAX_IPOPTLEN]; + const struct nf_osf_finger *kf; + struct nf_osf_hdr_ctx ctx; + const struct tcphdr *tcp; + const char *genre = NULL; + + memset(&ctx, 0, sizeof(ctx)); + + tcp = nf_osf_hdr_ctx_init(&ctx, skb, ip, opts); + if (!tcp) + return false; + + list_for_each_entry_rcu(kf, &nf_osf_fingers[ctx.df], finger_entry) { + f = &kf->finger; + if (!nf_osf_match_one(skb, f, -1, &ctx)) + continue; + + genre = f->genre; + break; + } + + return genre; +} +EXPORT_SYMBOL_GPL(nf_osf_find); + +MODULE_LICENSE("GPL"); -- cgit v1.2.3