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从新闻阅读器连接时出现 stunnel 错误：SSL3_READ_BYTES：tlsv1 alert unknown ca

tag-icon • tag-icon ubuntu ssl ssl-certificate stunnel
从新闻阅读器连接时出现 stunnel 错误：SSL3_READ_BYTES：tlsv1 alert unknown ca

我正在尝试设置 stunnel 以提供对 nntp 服务器的安全访问。按照说明这里我创建了一个自签名密钥和证书。我运行的命令是：

openssl genrsa -des3 -out server.key 1024
openssl req -new -key server.key -out server.csr
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

我的 stunnel 配置有以下选项：

; A copy of some devices and system files is needed within the chroot jail
; Chroot conflicts with configuration file reload and many other features
chroot = /usr/local/var/lib/stunnel/
; Chroot jail can be escaped if setuid option is not used
setuid = nobody
setgid = nogroup

; PID is created inside the chroot jail
pid = /stunnel.pid

; Debugging stuff (may useful for troubleshooting)
;debug = 7
output = /stunnel.log

; Certificate/key is needed in server mode and optional in client mode
cert = /usr/local/var/lib/stunnel/server.crt
key = /usr/local/var/lib/stunnel/server.key

; Disable support for insecure SSLv2 protocol
options = NO_SSLv2
; Workaround for Eudora bug
;options = DONT_INSERT_EMPTY_FRAGMENTS

[nntps]
accept  = 563
connect = 119

当我启动 stunnel（提供我的密码）并尝试连接 Thunderbird 时，Thunderbird 显示“正在连接...”，并且我收到以下错误消息stunnel.log：

2013.04.17 13:40:36 LOG5[30290:3074012864]: stunnel 4.56 on i686-pc-linux-gnu platform
2013.04.17 13:40:36 LOG5[30290:3074012864]: Compiled/running with OpenSSL 1.0.1 14 Mar 2012
2013.04.17 13:40:36 LOG5[30290:3074012864]: Threading:PTHREAD Sockets:POLL,IPv6 SSL:ENGINE,OCSP,FIPS
2013.04.17 13:40:36 LOG5[30290:3074012864]: Reading configuration from file /etc/stunnel/news.conf
2013.04.17 13:40:36 LOG5[30290:3074012864]: FIPS mode is disabled
2013.04.17 13:40:39 LOG5[30290:3074012864]: Configuration successful
2013.04.17 13:40:51 LOG5[30291:3073764160]: Service [nntps] accepted connection from    97.79.58.17:57054
2013.04.17 13:40:51 LOG5[30291:3073764160]: connect_blocking: connected 127.0.0.1:119
2013.04.17 13:40:51 LOG5[30291:3073764160]: Service [nntps] connected remote server from 127.0.0.1:46866
2013.04.17 13:40:51 LOG3[30291:3073764160]: SSL_read: 14094418: error:14094418:SSL    routines:SSL3_READ_BYTES:tlsv1 alert unknown ca
2013.04.17 13:40:51 LOG5[30291:3073764160]: Connection reset: 95 byte(s) sent to SSL, 0     byte(s) sent to socket

我被难住了。能帮忙吗？

编辑：其他地方有人建议我添加sslVersion=SSLv3到我的 stunnel 配置中，但这似乎没有任何效果。

答案1

“tlsv1 alert unknown ca” 对我来说听起来很清楚。stunnel 无法检查对方的证书，因为配置的 CA 与签署证书的 CA 不匹配。或者根本没有配置 CA。您需要一个这样的条目：

CAfile = /etc/stunnel/CA.crt

或者CApath相反（更复杂；只是如果您需要多个 CA）。

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