A Service Function Chain Deployment Method Against Side Channel Attack
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摘要: 侧信道攻击是当前云计算环境下多租户间信息泄露的主要途径，针对现有服务功能链(SFC)部署方法未充分考虑多租户环境下虚拟网络功能(VNF)面临的侧信道攻击问题，该文提出一种抗侧信道攻击的服务功能链部署方法。引入基于时间均值的租户分类策略以及结合历史信息的部署策略，在满足服务功能链资源约束条件下，以最小化租户所能覆盖的服务器数量为目标建立相应的优化模型，并设计了基于贪婪选择的部署算法。实验结果表明，与其他部署方法相比，该方法显著提高了恶意租户实现共存的难度与代价，降低了租户面临的侧信道攻击风险。Abstract: Side channel attack is the primary way to leak information between tenants in current cloud computing environment. However, existing Service Function Chain (SFC) deployment methods do not fully consider the side channel attack problem faced by the Virtual Network Function (VNF) in the multi-tenant environment. A SFC deployment method is proposed against side channel attack. A tenant classification strategy based on average time and a deployment strategy considering historical information are introduced. Under the resource constraints of the SFC, the optimization model is established with the goal of minimizing the number of servers that the tenant can cover. And a deployment algorithm is designed based on the greedy choice. The experimental results show that, compared with other deployment methods, this method can significantly improve the difficulty and cost of malicious tenant to realize co-residence, and reduces the risk of side channel attack faced by tenants.
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表 1 基于租户分类和历史信息的部署算法
输入：服务功能链请求信息$r$ 输出：请求$r$的部署方案 (1) #租户分类 (2)计算平均运行时间${\rm{AVG}}_\eta ^{}$，确定请求所属租户${\eta ^r}$的分类XT； (3)依据分类结果，确定可部署服务器集合$\bar N_{}^{{\rm{XT}}}$以及租户${\eta ^r}$在该
区域已占用的服务器集合$\bar N_{{\eta ^r}}^{{\rm{XT}}}$；(4) #VNF部署 (5) SFCdpsucc=0, nodedpsucc=0#设置部署成败状态标志； (6) For each ${\rm{VNF}}_i^{\rm{r}}$in $\psi _{}^r$#遍历SFC请求中所有的m个VNF； (7) 筛选出$\bar N_{}^{{\rm{XT}}},\bar N_{{\eta ^r}}^{{\rm{XT}}}$中支持该类型VNF且剩余资源足够的
服务器集合$\bar N_{{\rm{VNF}}_i^{{r}}}^{{\rm{XT}}},\bar N_{{\eta ^r},{\rm{VNF}}_i^{{r}}}^{{\rm{XT}}}$；(8) If $\bar N_{{\eta ^r},{\rm{VNF}}_i^r}^{{\rm{XT}}}$不为空，则从中选取剩余资源最多的服务器
节点部署${\rm{VNF}}_i^r$；(9) If $\bar N_{{\eta ^r},{\rm{VNF}}_i^r}^{{\rm{XT}}}$为空，则从$\bar N_{{\rm{VNF}}_i^r}^{{\rm{XT}}}$中选取剩余资源最多的服
务器节点部署${\rm{VNF}}_i^r$；(10) 记录${\rm{VNF}}_i^r$所部属的服务器节点$n_i^r$，并对节点$n_i^r$资源
余量和$\bar N_{{\eta ^r}}^{{\rm{XT}}}$进行预更新；(11) If $\psi _{}^r$中所有的VNF均找到可部署服务器节点； (12) nodesucc=1，并对相关服务器节点资源余量和$\bar N_{{\eta ^r}}^{{\rm{XT}}}$进
行更新。(13) #虚拟链路部署 (14) linkdpsucc=0#设置链路部署成败状态标志； (15) If nodedpsucc==1； (16) For each $l_{i,i + 1}^r$ in $L_{}^r$#遍历该SFC请求中所有的虚拟
链路；(17) 确定节点$n_i^r$与$n_{i + 1}^r$之间带宽余量足够的可用链
路集合$\bar L_{n_i^r,n_{i + 1}^r}^{}$；(18) 从中筛选出部署代价$B_{\cos t}^r$最小的链路集合#存
在多条同等长度的链路；(19) 从中选取带宽资源余量最大的链路； (20) 记录所使用的链路，并对链路资源余量进行预
更新；(21) If $L_{}^r$中所有的虚拟链路找到可部署的物理链路； (22) linkdpsucc=1，并对相关物理链路资源余量进
行更新；(23) If (nodedpsucc and linkdpsucc)==1； (24) SFCdpsucc=1#该SFC请求部署成功； 
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