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[TACACS+]: Add support to specify source address for TACACS+ (sonic-n…
…et#4610) This pull request was cherry picked from "sonic-net#1238" to resolve the conflicts. - Why I did it Add support to specify source address for TACACS+ - How I did it Add patches for libpam-tacplus and libnss-tacplus. The patches parse the new option 'src_ip' and store the converted addrinfo. Then the addrinfo is used for TACACS+ connection. Add a attribute 'src_ip' for table "TACPLUS|global" in configDB Add some code to adapt to the attribute 'src_ip'. - How to verify it Config command for source address PR in sonic-utilities config tacacs src_ip <ip_address> - Description for the changelog Add patches to specify source address for the TACACS+ outgoing packets. - A picture of a cute animal (not mandatory but encouraged) **UT logs: ** UT_tacacs_source_intf.txt
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77 changes: 77 additions & 0 deletions
77
src/tacacs/nss/0007-Add-support-for-TACACS-source-address.patch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| From 61e951efe54085fe427a32d0e7db8ef08c02fa95 Mon Sep 17 00:00:00 2001 | ||
| From: Venkatesan Mahalingam <venkatesan_mahalinga@dell.com> | ||
| Date: Mon, 6 Jul 2020 12:14:26 -0700 | ||
| Subject: [PATCH] Add support for TACACS+ source address. | ||
|
|
||
| Signed-off-by: Venkatesan Mahalingam <venkatesan_mahalinga@dell.com> | ||
| --- | ||
| nss_tacplus.c | 25 ++++++++++++++++++++++++- | ||
| 1 file changed, 24 insertions(+), 1 deletion(-) | ||
|
|
||
| diff --git a/nss_tacplus.c b/nss_tacplus.c | ||
| index 64a9328..bf6b934 100644 | ||
| --- a/nss_tacplus.c | ||
| +++ b/nss_tacplus.c | ||
| @@ -73,6 +73,7 @@ typedef struct { | ||
| static tacplus_server_t tac_srv[TAC_PLUS_MAXSERVERS]; | ||
| static int tac_srv_no; | ||
| static useradd_info_t useradd_grp_list[MAX_TACACS_USER_PRIV + 1]; | ||
| +static struct addrinfo *source_addr; | ||
|
|
||
| static char *tac_service = "shell"; | ||
| static char *tac_protocol = "ssh"; | ||
| @@ -247,6 +248,10 @@ static int parse_config(const char *file) | ||
| return NSS_STATUS_UNAVAIL; | ||
| } | ||
|
|
||
| + if(source_addr) { | ||
| + freeaddrinfo(source_addr); | ||
| + source_addr = NULL; | ||
| + } | ||
| debug = false; | ||
| tac_srv_no = 0; | ||
| while(fgets(buf, sizeof buf, fp)) { | ||
| @@ -262,6 +267,22 @@ static int parse_config(const char *file) | ||
| else if(!strncmp(buf, "user_priv=", 10)) { | ||
| parse_user_priv(buf); | ||
| } | ||
| + else if(!strncmp(buf, "src_ip=", 7)) { | ||
| + struct addrinfo hints; | ||
| + char *ip = buf + 7, *new_line; | ||
| + | ||
| + // Remove the new line character as getaddrinfo is not working for IPv6 address with '\n'. | ||
| + if ((new_line = strchr(buf, '\n')) != NULL) { | ||
| + *new_line = '\0'; | ||
| + } | ||
| + memset(&hints, 0, sizeof hints); | ||
| + hints.ai_family = AF_UNSPEC; | ||
| + hints.ai_socktype = SOCK_STREAM; | ||
| + | ||
| + if(0 != getaddrinfo(ip, NULL, &hints, &source_addr)) | ||
| + syslog(LOG_ERR, "%s: error setting the source ip information", | ||
| + nssname); | ||
| + } | ||
| else if(!strncmp(buf, "server=", 7)) { | ||
| if(TAC_PLUS_MAXSERVERS <= tac_srv_no) { | ||
| syslog(LOG_ERR, "%s: tac server num is more than %d", | ||
| @@ -282,6 +303,8 @@ static int parse_config(const char *file) | ||
| nssname, n, tac_ntop(tac_srv[n].addr->ai_addr), | ||
| tac_srv[n].key[0], tac_srv[n].timeout); | ||
| } | ||
| + syslog(LOG_DEBUG, "%s: src_ip=%s", nssname, NULL == source_addr | ||
| + ? "NULL" : tac_ntop(source_addr->ai_addr)); | ||
| syslog(LOG_DEBUG, "%s: many_to_one %s", nssname, 1 == many_to_one | ||
| ? "enable" : "disable"); | ||
| for(n = MIN_TACACS_USER_PRIV; n <= MAX_TACACS_USER_PRIV; n++) { | ||
| @@ -690,7 +713,7 @@ connect_tacacs(struct tac_attrib **attr, int srvr) | ||
| if(!*tac_service) /* reported at config file processing */ | ||
| return -1; | ||
|
|
||
| - fd = tac_connect_single(tac_srv[srvr].addr, tac_srv[srvr].key, NULL, | ||
| + fd = tac_connect_single(tac_srv[srvr].addr, tac_srv[srvr].key, source_addr, | ||
| tac_srv[srvr].timeout, vrfname[0] ? vrfname : NULL); | ||
| if(fd >= 0) { | ||
| *attr = NULL; /* so tac_add_attr() allocates memory */ | ||
| -- | ||
| 2.7.4 | ||
|
|
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131 changes: 131 additions & 0 deletions
131
src/tacacs/pam/0006-Add-support-for-source-ip-address.patch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| From 9c26e734cf9e5cec950dc8b8f474f89d87833bcd Mon Sep 17 00:00:00 2001 | ||
| From: Venkatesan Mahalingam <venkatesan_mahalinga@dell.com> | ||
| Date: Wed, 1 Jul 2020 18:57:28 -0700 | ||
| Subject: [PATCH] Add support to specify source address for TACACS+ | ||
|
|
||
| --- | ||
| pam_tacplus.c | 8 ++++---- | ||
| support.c | 31 +++++++++++++++++++++++++++++++ | ||
| support.h | 1 + | ||
| 3 files changed, 36 insertions(+), 4 deletions(-) | ||
|
|
||
| diff --git a/pam_tacplus.c b/pam_tacplus.c | ||
| index 38e2a70..ec8ea27 100644 | ||
| --- a/pam_tacplus.c | ||
| +++ b/pam_tacplus.c | ||
| @@ -177,7 +177,7 @@ int _pam_account(pam_handle_t *pamh, int argc, const char **argv, | ||
|
|
||
| status = PAM_SESSION_ERR; | ||
| for(srv_i = 0; srv_i < tac_srv_no; srv_i++) { | ||
| - tac_fd = tac_connect_single(tac_srv[srv_i].addr, tac_srv[srv_i].key, NULL, tac_timeout, __vrfname); | ||
| + tac_fd = tac_connect_single(tac_srv[srv_i].addr, tac_srv[srv_i].key, tac_source_addr, tac_timeout, __vrfname); | ||
| if (tac_fd < 0) { | ||
| _pam_log(LOG_WARNING, "%s: error sending %s (fd)", | ||
| __FUNCTION__, typemsg); | ||
| @@ -276,7 +276,7 @@ int pam_sm_authenticate (pam_handle_t * pamh, int flags, | ||
| if (ctrl & PAM_TAC_DEBUG) | ||
| syslog(LOG_DEBUG, "%s: trying srv %d", __FUNCTION__, srv_i ); | ||
|
|
||
| - tac_fd = tac_connect_single(tac_srv[srv_i].addr, tac_srv[srv_i].key, NULL, tac_timeout, __vrfname); | ||
| + tac_fd = tac_connect_single(tac_srv[srv_i].addr, tac_srv[srv_i].key, tac_source_addr, tac_timeout, __vrfname); | ||
| if (tac_fd < 0) { | ||
| _pam_log(LOG_ERR, "%s: connection to srv %d failed", __FUNCTION__, srv_i); | ||
| continue; | ||
| @@ -579,7 +579,7 @@ int pam_sm_acct_mgmt (pam_handle_t * pamh, int flags, | ||
| if(tac_protocol[0] != '\0') | ||
| tac_add_attrib(&attr, "protocol", tac_protocol); | ||
|
|
||
| - tac_fd = tac_connect_single(active_server.addr, active_server.key, NULL, tac_timeout, __vrfname); | ||
| + tac_fd = tac_connect_single(active_server.addr, active_server.key, tac_source_addr, tac_timeout, __vrfname); | ||
| if(tac_fd < 0) { | ||
| _pam_log (LOG_ERR, "TACACS+ server unavailable"); | ||
| if(arep.msg != NULL) | ||
| @@ -762,7 +762,7 @@ int pam_sm_chauthtok(pam_handle_t * pamh, int flags, | ||
| if (ctrl & PAM_TAC_DEBUG) | ||
| syslog(LOG_DEBUG, "%s: trying srv %d", __FUNCTION__, srv_i ); | ||
|
|
||
| - tac_fd = tac_connect_single(tac_srv[srv_i].addr, tac_srv[srv_i].key, NULL, tac_timeout, __vrfname); | ||
| + tac_fd = tac_connect_single(tac_srv[srv_i].addr, tac_srv[srv_i].key, tac_source_addr, tac_timeout, __vrfname); | ||
| if (tac_fd < 0) { | ||
| _pam_log(LOG_ERR, "connection failed srv %d: %m", srv_i); | ||
| continue; | ||
| diff --git a/support.c b/support.c | ||
| index 7c00618..3e55e2f 100644 | ||
| --- a/support.c | ||
| +++ b/support.c | ||
| @@ -37,6 +37,8 @@ char tac_service[64]; | ||
| char tac_protocol[64]; | ||
| char tac_prompt[64]; | ||
| char *__vrfname=NULL; | ||
| +char tac_source_ip[64]; | ||
| +struct addrinfo *tac_source_addr = NULL; | ||
|
|
||
| void _pam_log(int err, const char *format,...) { | ||
| char msg[256]; | ||
| @@ -183,6 +185,12 @@ int _pam_parse (int argc, const char **argv) { | ||
| tac_protocol[0] = 0; | ||
| tac_prompt[0] = 0; | ||
| tac_login[0] = 0; | ||
| + tac_source_ip[0] = 0; | ||
| + | ||
| + if (tac_source_addr != NULL) { | ||
| + freeaddrinfo(tac_source_addr); | ||
| + tac_source_addr = NULL; | ||
| + } | ||
|
|
||
| for (ctrl = 0; argc-- > 0; ++argv) { | ||
| if (!strcmp (*argv, "debug")) { /* all */ | ||
| @@ -274,6 +282,10 @@ int _pam_parse (int argc, const char **argv) { | ||
| } | ||
| } else if(!strncmp(*argv, "vrf=", 4)) { | ||
| __vrfname = strdup(*argv + 4); | ||
| + } else if (!strncmp (*argv, "source_ip=", strlen("source_ip="))) { | ||
| + /* source ip for the packets */ | ||
| + strncpy (tac_source_ip, *argv + strlen("source_ip="), sizeof(tac_source_ip)); | ||
| + set_source_ip (tac_source_ip, &tac_source_addr); | ||
| } else { | ||
| _pam_log (LOG_WARNING, "unrecognized option: %s", *argv); | ||
| } | ||
| @@ -292,8 +304,27 @@ int _pam_parse (int argc, const char **argv) { | ||
| _pam_log(LOG_DEBUG, "tac_protocol='%s'", tac_protocol); | ||
| _pam_log(LOG_DEBUG, "tac_prompt='%s'", tac_prompt); | ||
| _pam_log(LOG_DEBUG, "tac_login='%s'", tac_login); | ||
| + _pam_log(LOG_DEBUG, "tac_source_ip='%s'", tac_source_ip); | ||
| } | ||
|
|
||
| return ctrl; | ||
| } /* _pam_parse */ | ||
|
|
||
| +/* set source ip address for the outgoing tacacs packets */ | ||
| +void set_source_ip(const char *tac_source_ip, | ||
| + struct addrinfo **source_address) { | ||
| + | ||
| + struct addrinfo hints; | ||
| + int rv; | ||
| + | ||
| + /* set the source ip address for the tacacs packets */ | ||
| + memset(&hints, 0, sizeof(hints)); | ||
| + hints.ai_family = AF_UNSPEC; | ||
| + hints.ai_socktype = SOCK_STREAM; | ||
| + if ((rv = getaddrinfo(tac_source_ip, NULL, &hints, | ||
| + source_address)) != 0) { | ||
| + _pam_log(LOG_ERR, "error setting the source ip information"); | ||
| + } else { | ||
| + _pam_log(LOG_DEBUG, "source ip is set"); | ||
| + } | ||
| +} | ||
| diff --git a/support.h b/support.h | ||
| index 9cbd040..09b8a85 100644 | ||
| --- a/support.h | ||
| +++ b/support.h | ||
| @@ -37,6 +37,7 @@ extern int tac_srv_no; | ||
| extern char tac_service[64]; | ||
| extern char tac_protocol[64]; | ||
| extern char tac_prompt[64]; | ||
| +extern struct addrinfo *tac_source_addr; | ||
|
|
||
| int _pam_parse (int, const char **); | ||
| unsigned long _resolve_name (char *); | ||
| -- | ||
| 2.7.4 | ||
|
|
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