From 39a21dd1b0eec3f5eac84ee42bda5ab4915098ae Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Mon, 4 Dec 2006 20:22:39 -0500 Subject: [PATCH] rpcgss: krb5: clean up some goto's, etc. Remove some unnecessary goto labels; clean up some return values; etc. Signed-off-by: J. Bruce Fields Signed-off-by: Trond Myklebust --- net/sunrpc/auth_gss/gss_krb5_seal.c | 10 ++-- net/sunrpc/auth_gss/gss_krb5_unseal.c | 45 +++++++----------- net/sunrpc/auth_gss/gss_krb5_wrap.c | 68 +++++++++++---------------- 3 files changed, 48 insertions(+), 75 deletions(-) diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c b/net/sunrpc/auth_gss/gss_krb5_seal.c index c187f7f1520f..f3f42a4465cf 100644 --- a/net/sunrpc/auth_gss/gss_krb5_seal.c +++ b/net/sunrpc/auth_gss/gss_krb5_seal.c @@ -90,7 +90,7 @@ gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text, if (ctx->sealalg != SEAL_ALG_NONE && ctx->sealalg != SEAL_ALG_DES) { dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n", ctx->sealalg); - goto out_err; + return GSS_S_FAILURE; } token->len = g_token_size(&ctx->mech_used, 22); @@ -109,11 +109,11 @@ gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text, memset(krb5_hdr + 4, 0xff, 4); if (make_checksum("md5", krb5_hdr, 8, text, 0, &md5cksum)) - goto out_err; + return GSS_S_FAILURE; if (krb5_encrypt(ctx->seq, NULL, md5cksum.data, md5cksum.data, md5cksum.len)) - goto out_err; + return GSS_S_FAILURE; memcpy(krb5_hdr + 16, md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH, KRB5_CKSUM_LENGTH); @@ -124,9 +124,7 @@ gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text, if ((krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff, seq_send, krb5_hdr + 16, krb5_hdr + 8))) - goto out_err; + return GSS_S_FAILURE; return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE); -out_err: - return GSS_S_FAILURE; } diff --git a/net/sunrpc/auth_gss/gss_krb5_unseal.c b/net/sunrpc/auth_gss/gss_krb5_unseal.c index 62807ac1e2ca..75a75a6d1336 100644 --- a/net/sunrpc/auth_gss/gss_krb5_unseal.c +++ b/net/sunrpc/auth_gss/gss_krb5_unseal.c @@ -85,69 +85,56 @@ gss_verify_mic_kerberos(struct gss_ctx *gss_ctx, s32 seqnum; unsigned char *ptr = (unsigned char *)read_token->data; int bodysize; - u32 ret = GSS_S_DEFECTIVE_TOKEN; dprintk("RPC: krb5_read_token\n"); if (g_verify_token_header(&ctx->mech_used, &bodysize, &ptr, read_token->len)) - goto out; + return GSS_S_DEFECTIVE_TOKEN; if ((*ptr++ != ((KG_TOK_MIC_MSG>>8)&0xff)) || (*ptr++ != ( KG_TOK_MIC_MSG &0xff)) ) - goto out; + return GSS_S_DEFECTIVE_TOKEN; /* XXX sanity-check bodysize?? */ - /* get the sign and seal algorithms */ - signalg = ptr[0] + (ptr[1] << 8); sealalg = ptr[2] + (ptr[3] << 8); /* Sanity checks */ if ((ptr[4] != 0xff) || (ptr[5] != 0xff)) - goto out; + return GSS_S_DEFECTIVE_TOKEN; if (sealalg != 0xffff) - goto out; + return GSS_S_DEFECTIVE_TOKEN; if (signalg != SGN_ALG_DES_MAC_MD5) - goto out; + return GSS_S_DEFECTIVE_TOKEN; - ret = make_checksum("md5", ptr - 2, 8, message_buffer, 0, &md5cksum); - if (ret) - goto out; + if (make_checksum("md5", ptr - 2, 8, message_buffer, 0, &md5cksum)) + return GSS_S_FAILURE; - ret = krb5_encrypt(ctx->seq, NULL, md5cksum.data, - md5cksum.data, 16); - if (ret) - goto out; + if (krb5_encrypt(ctx->seq, NULL, md5cksum.data, md5cksum.data, 16)) + return GSS_S_FAILURE; - if (memcmp(md5cksum.data + 8, ptr + 14, 8)) { - ret = GSS_S_BAD_SIG; - goto out; - } + if (memcmp(md5cksum.data + 8, ptr + 14, 8)) + return GSS_S_BAD_SIG; /* it got through unscathed. Make sure the context is unexpired */ now = get_seconds(); - ret = GSS_S_CONTEXT_EXPIRED; if (now > ctx->endtime) - goto out; + return GSS_S_CONTEXT_EXPIRED; /* do sequencing checks */ - ret = GSS_S_BAD_SIG; - if ((ret = krb5_get_seq_num(ctx->seq, ptr + 14, ptr + 6, &direction, - &seqnum))) - goto out; + if (krb5_get_seq_num(ctx->seq, ptr + 14, ptr + 6, &direction, &seqnum)) + return GSS_S_FAILURE; if ((ctx->initiate && direction != 0xff) || (!ctx->initiate && direction != 0)) - goto out; + return GSS_S_BAD_SIG; - ret = GSS_S_COMPLETE; -out: - return ret; + return GSS_S_COMPLETE; } diff --git a/net/sunrpc/auth_gss/gss_krb5_wrap.c b/net/sunrpc/auth_gss/gss_krb5_wrap.c index 6d508d77adf9..63b06ee2d542 100644 --- a/net/sunrpc/auth_gss/gss_krb5_wrap.c +++ b/net/sunrpc/auth_gss/gss_krb5_wrap.c @@ -136,7 +136,7 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset, if (kctx->sealalg != SEAL_ALG_NONE && kctx->sealalg != SEAL_ALG_DES) { dprintk("RPC: gss_krb5_seal: kctx->sealalg %d not supported\n", kctx->sealalg); - goto out_err; + return GSS_S_FAILURE; } blocksize = crypto_blkcipher_blocksize(kctx->enc); @@ -178,12 +178,12 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset, buf->pages = pages; if (make_checksum("md5", krb5_hdr, 8, buf, offset + headlen - blocksize, &md5cksum)) - goto out_err; + return GSS_S_FAILURE; buf->pages = tmp_pages; if (krb5_encrypt(kctx->seq, NULL, md5cksum.data, md5cksum.data, md5cksum.len)) - goto out_err; + return GSS_S_FAILURE; memcpy(krb5_hdr + 16, md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH, KRB5_CKSUM_LENGTH); @@ -196,15 +196,13 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset, * and encrypt at the same time: */ if ((krb5_make_seq_num(kctx->seq, kctx->initiate ? 0 : 0xff, seq_send, krb5_hdr + 16, krb5_hdr + 8))) - goto out_err; + return GSS_S_FAILURE; if (gss_encrypt_xdr_buf(kctx->enc, buf, offset + headlen - blocksize, pages)) - goto out_err; + return GSS_S_FAILURE; return ((kctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE); -out_err: - return GSS_S_FAILURE; } u32 @@ -220,7 +218,6 @@ gss_unwrap_kerberos(struct gss_ctx *ctx, int offset, struct xdr_buf *buf) s32 seqnum; unsigned char *ptr; int bodysize; - u32 ret = GSS_S_DEFECTIVE_TOKEN; void *data_start, *orig_start; int data_len; int blocksize; @@ -230,11 +227,11 @@ gss_unwrap_kerberos(struct gss_ctx *ctx, int offset, struct xdr_buf *buf) ptr = (u8 *)buf->head[0].iov_base + offset; if (g_verify_token_header(&kctx->mech_used, &bodysize, &ptr, buf->len - offset)) - goto out; + return GSS_S_DEFECTIVE_TOKEN; if ((*ptr++ != ((KG_TOK_WRAP_MSG>>8)&0xff)) || (*ptr++ != (KG_TOK_WRAP_MSG &0xff)) ) - goto out; + return GSS_S_DEFECTIVE_TOKEN; /* XXX sanity-check bodysize?? */ @@ -246,18 +243,18 @@ gss_unwrap_kerberos(struct gss_ctx *ctx, int offset, struct xdr_buf *buf) /* Sanity checks */ if ((ptr[4] != 0xff) || (ptr[5] != 0xff)) - goto out; + return GSS_S_DEFECTIVE_TOKEN; if (sealalg == 0xffff) - goto out; + return GSS_S_DEFECTIVE_TOKEN; if (signalg != SGN_ALG_DES_MAC_MD5) - goto out; + return GSS_S_DEFECTIVE_TOKEN; /* in the current spec, there is only one valid seal algorithm per key type, so a simple comparison is ok */ if (sealalg != kctx->sealalg) - goto out; + return GSS_S_DEFECTIVE_TOKEN; /* there are several mappings of seal algorithms to sign algorithms, but few enough that we can try them all. */ @@ -266,45 +263,39 @@ gss_unwrap_kerberos(struct gss_ctx *ctx, int offset, struct xdr_buf *buf) (kctx->sealalg == SEAL_ALG_1 && signalg != SGN_ALG_3) || (kctx->sealalg == SEAL_ALG_DES3KD && signalg != SGN_ALG_HMAC_SHA1_DES3_KD)) - goto out; + return GSS_S_DEFECTIVE_TOKEN; if (gss_decrypt_xdr_buf(kctx->enc, buf, ptr + 22 - (unsigned char *)buf->head[0].iov_base)) - goto out; + return GSS_S_DEFECTIVE_TOKEN; - ret = make_checksum("md5", ptr - 2, 8, buf, - ptr + 22 - (unsigned char *)buf->head[0].iov_base, &md5cksum); - if (ret) - goto out; + if (make_checksum("md5", ptr - 2, 8, buf, + ptr + 22 - (unsigned char *)buf->head[0].iov_base, &md5cksum)) + return GSS_S_FAILURE; - ret = krb5_encrypt(kctx->seq, NULL, md5cksum.data, - md5cksum.data, md5cksum.len); - if (ret) - goto out; + if (krb5_encrypt(kctx->seq, NULL, md5cksum.data, + md5cksum.data, md5cksum.len)) + return GSS_S_FAILURE; - if (memcmp(md5cksum.data + 8, ptr + 14, 8)) { - ret = GSS_S_BAD_SIG; - goto out; - } + if (memcmp(md5cksum.data + 8, ptr + 14, 8)) + return GSS_S_BAD_SIG; /* it got through unscathed. Make sure the context is unexpired */ now = get_seconds(); - ret = GSS_S_CONTEXT_EXPIRED; if (now > kctx->endtime) - goto out; + return GSS_S_CONTEXT_EXPIRED; /* do sequencing checks */ - ret = GSS_S_BAD_SIG; - if ((ret = krb5_get_seq_num(kctx->seq, ptr + 14, ptr + 6, &direction, - &seqnum))) - goto out; + if (krb5_get_seq_num(kctx->seq, ptr + 14, ptr + 6, &direction, + &seqnum)) + return GSS_S_BAD_SIG; if ((kctx->initiate && direction != 0xff) || (!kctx->initiate && direction != 0)) - goto out; + return GSS_S_BAD_SIG; /* Copy the data back to the right position. XXX: Would probably be * better to copy and encrypt at the same time. */ @@ -317,11 +308,8 @@ gss_unwrap_kerberos(struct gss_ctx *ctx, int offset, struct xdr_buf *buf) buf->head[0].iov_len -= (data_start - orig_start); buf->len -= (data_start - orig_start); - ret = GSS_S_DEFECTIVE_TOKEN; if (gss_krb5_remove_padding(buf, blocksize)) - goto out; + return GSS_S_DEFECTIVE_TOKEN; - ret = GSS_S_COMPLETE; -out: - return ret; + return GSS_S_COMPLETE; } -- 2.34.1