Date: Wed, 13 Dec 2023 20:06:16 GMT From: Dag-Erling =?utf-8?Q?Sm=C3=B8rgrav?= <des@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 5761f8a7de9f - stable/13 - libtacplus: Allow additional AV pairs to be configured. Message-ID: <202312132006.3BDK6GCW086815@gitrepo.freebsd.org>
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The branch stable/13 has been updated by des: URL: https://cgit.FreeBSD.org/src/commit/?id=5761f8a7de9fa0248e1d7e2be751de1c6d9aa973 commit 5761f8a7de9fa0248e1d7e2be751de1c6d9aa973 Author: Dag-Erling Smørgrav <des@FreeBSD.org> AuthorDate: 2023-06-13 16:04:22 +0000 Commit: Dag-Erling Smørgrav <des@FreeBSD.org> CommitDate: 2023-12-13 16:08:13 +0000 libtacplus: Allow additional AV pairs to be configured. * Replace hand-rolled input tokenizer with openpam_readlinev() which supports line continuations and has better quoting and escaping. * Simplify string handling by merging struct clnt_str and struct srvr_str into just struct tac_str. * Each server entry in the configuration file can now have up to 255 AV pairs which will be appended to the ones returned by the server in response to a successful authorization request. This allows nss_tacplus(8) to be used with servers which do not provide identity information beyond confirming the existence of the user. This adds a dependency on libpam, however libtacplus is currently only used by pam_tacplus(8) (which is already always used with libpam) and the very recently added nss_tacplus(8) (which is extremely niche). In the longer term it might be a good idea to split this out into a separate library. MFC after: 1 week Sponsored by: Klara, Inc. Reviewed by: pauamma_gundo.com, markj Differential Revision: https://reviews.freebsd.org/D40285 Relnotes: yes (cherry picked from commit 21850106fdda5269bc881f0e62839dff3d9edf47) --- UPDATING | 7 + lib/libtacplus/Makefile | 2 +- lib/libtacplus/taclib.c | 347 +++++++++++++++++----------------------- lib/libtacplus/taclib_private.h | 63 ++++---- lib/libtacplus/tacplus.conf.5 | 42 ++--- share/mk/src.libnames.mk | 2 +- 6 files changed, 206 insertions(+), 257 deletions(-) diff --git a/UPDATING b/UPDATING index 67809e8fc4dc..21873313b3be 100644 --- a/UPDATING +++ b/UPDATING @@ -12,6 +12,13 @@ Items affecting the ports and packages system can be found in /usr/ports/UPDATING. Please read that file before updating system packages and/or ports. +20230913: + Improvements to libtacplus(8) mean that tacplus.conf(5) now + follows POSIX shell syntax rules. This may cause TACACS+ + authentication to fail if the shared secret contains a single + quote, double quote, or backslash character which isn't + already properly quoted or escaped. + 20230619: To enable pf rdr rules for connections initiated from the host, pf filter rules can be optionally enabled for packets delivered diff --git a/lib/libtacplus/Makefile b/lib/libtacplus/Makefile index b658d6ce02ba..43567350aeac 100644 --- a/lib/libtacplus/Makefile +++ b/lib/libtacplus/Makefile @@ -27,7 +27,7 @@ LIB= tacplus SRCS= taclib.c INCS= taclib.h CFLAGS+= -Wall -LIBADD= md +LIBADD= md pam SHLIB_MAJOR= 5 MAN= libtacplus.3 tacplus.conf.5 diff --git a/lib/libtacplus/taclib.c b/lib/libtacplus/taclib.c index 6577876ef44f..00bee367ca9f 100644 --- a/lib/libtacplus/taclib.c +++ b/lib/libtacplus/taclib.c @@ -34,6 +34,7 @@ #include <arpa/inet.h> #include <assert.h> +#include <ctype.h> #include <errno.h> #include <fcntl.h> #include <md5.h> @@ -45,32 +46,34 @@ #include <string.h> #include <unistd.h> +#include <security/pam_appl.h> +#include <security/openpam.h> + #include "taclib_private.h" static int add_str_8(struct tac_handle *, u_int8_t *, - struct clnt_str *); + struct tac_str *); static int add_str_16(struct tac_handle *, u_int16_t *, - struct clnt_str *); + struct tac_str *); static int protocol_version(int, int, int); static void close_connection(struct tac_handle *); static int conn_server(struct tac_handle *); static void crypt_msg(struct tac_handle *, struct tac_msg *); -static void *dup_str(struct tac_handle *, const struct srvr_str *, +static void *dup_str(struct tac_handle *, const struct tac_str *, size_t *); static int establish_connection(struct tac_handle *); -static void free_str(struct clnt_str *); +static void free_str(struct tac_str *); static void generr(struct tac_handle *, const char *, ...) __printflike(2, 3); static void gen_session_id(struct tac_msg *); static int get_srvr_end(struct tac_handle *); -static int get_srvr_str(struct tac_handle *, const char *, - struct srvr_str *, size_t); -static void init_clnt_str(struct clnt_str *); -static void init_srvr_str(struct srvr_str *); +static int get_str(struct tac_handle *, const char *, + struct tac_str *, size_t); +static void init_str(struct tac_str *); static int read_timed(struct tac_handle *, void *, size_t, const struct timeval *); static int recv_msg(struct tac_handle *); -static int save_str(struct tac_handle *, struct clnt_str *, +static int save_str(struct tac_handle *, struct tac_str *, const void *, size_t); static int send_msg(struct tac_handle *); static int split(char *, char *[], int, char *, size_t); @@ -88,7 +91,7 @@ static void create_msg(struct tac_handle *, int, int, int); * for the next time. */ static int -add_str_8(struct tac_handle *h, u_int8_t *fld, struct clnt_str *cs) +add_str_8(struct tac_handle *h, u_int8_t *fld, struct tac_str *cs) { u_int16_t len; @@ -112,7 +115,7 @@ add_str_8(struct tac_handle *h, u_int8_t *fld, struct clnt_str *cs) * for the next time. */ static int -add_str_16(struct tac_handle *h, u_int16_t *fld, struct clnt_str *cs) +add_str_16(struct tac_handle *h, u_int16_t *fld, struct tac_str *cs) { size_t len; @@ -234,7 +237,7 @@ close_connection(struct tac_handle *h) static int conn_server(struct tac_handle *h) { - const struct tac_server *srvp = &h->servers[h->cur_server]; + struct tac_server *srvp = &h->servers[h->cur_server]; int flags; if ((h->fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) { @@ -355,7 +358,7 @@ crypt_msg(struct tac_handle *h, struct tac_msg *msg) * though they have no content. */ static void * -dup_str(struct tac_handle *h, const struct srvr_str *ss, size_t *len) +dup_str(struct tac_handle *h, const struct tac_str *ss, size_t *len) { unsigned char *p; @@ -402,10 +405,10 @@ establish_connection(struct tac_handle *h) * Free a client string, obliterating its contents first for security. */ static void -free_str(struct clnt_str *cs) +free_str(struct tac_str *cs) { if (cs->data != NULL) { - memset(cs->data, 0, cs->len); + memset_s(cs->data, cs->len, 0, cs->len); free(cs->data); cs->data = NULL; cs->len = 0; @@ -456,8 +459,8 @@ get_srvr_end(struct tac_handle *h) } static int -get_srvr_str(struct tac_handle *h, const char *field, - struct srvr_str *ss, size_t len) +get_str(struct tac_handle *h, const char *field, + struct tac_str *ss, size_t len) { if (h->srvr_pos + len > ntohl(h->response.length)) { generr(h, "Invalid length field in %s response from server " @@ -472,19 +475,12 @@ get_srvr_str(struct tac_handle *h, const char *field, } static void -init_clnt_str(struct clnt_str *cs) +init_str(struct tac_str *cs) { cs->data = NULL; cs->len = 0; } -static void -init_srvr_str(struct srvr_str *ss) -{ - ss->data = NULL; - ss->len = 0; -} - static int read_timed(struct tac_handle *h, void *buf, size_t len, const struct timeval *deadline) @@ -597,7 +593,7 @@ recv_msg(struct tac_handle *h) } static int -save_str(struct tac_handle *h, struct clnt_str *cs, const void *data, +save_str(struct tac_handle *h, struct tac_str *cs, const void *data, size_t len) { free_str(cs); @@ -687,84 +683,14 @@ send_msg(struct tac_handle *h) return 0; } -/* - * Destructively split a string into fields separated by white space. - * `#' at the beginning of a field begins a comment that extends to the - * end of the string. Fields may be quoted with `"'. Inside quoted - * strings, the backslash escapes `\"' and `\\' are honored. - * - * Pointers to up to the first maxfields fields are stored in the fields - * array. Missing fields get NULL pointers. - * - * The return value is the actual number of fields parsed, and is always - * <= maxfields. - * - * On a syntax error, places a message in the msg string, and returns -1. - */ static int -split(char *str, char *fields[], int maxfields, char *msg, size_t msglen) -{ - char *p; - int i; - static const char ws[] = " \t"; - - for (i = 0; i < maxfields; i++) - fields[i] = NULL; - p = str; - i = 0; - while (*p != '\0') { - p += strspn(p, ws); - if (*p == '#' || *p == '\0') - break; - if (i >= maxfields) { - snprintf(msg, msglen, "line has too many fields"); - return -1; - } - if (*p == '"') { - char *dst; - - dst = ++p; - fields[i] = dst; - while (*p != '"') { - if (*p == '\\') { - p++; - if (*p != '"' && *p != '\\' && - *p != '\0') { - snprintf(msg, msglen, - "invalid `\\' escape"); - return -1; - } - } - if (*p == '\0') { - snprintf(msg, msglen, - "unterminated quoted string"); - return -1; - } - *dst++ = *p++; - } - *dst = '\0'; - p++; - if (*p != '\0' && strspn(p, ws) == 0) { - snprintf(msg, msglen, "quoted string not" - " followed by white space"); - return -1; - } - } else { - fields[i] = p; - p += strcspn(p, ws); - if (*p != '\0') - *p++ = '\0'; - } - i++; - } - return i; -} - -int -tac_add_server(struct tac_handle *h, const char *host, int port, - const char *secret, int timeout, int flags) +tac_add_server_av(struct tac_handle *h, const char *host, int port, + const char *secret, int timeout, int flags, const char *const *avs) { struct tac_server *srvp; + const char *p; + size_t len; + int i; if (h->num_servers >= MAXSERVERS) { generr(h, "Too many TACACS+ servers specified"); @@ -790,8 +716,46 @@ tac_add_server(struct tac_handle *h, const char *host, int port, return -1; srvp->timeout = timeout; srvp->flags = flags; + srvp->navs = 0; + for (i = 0; avs[i] != NULL; i++) { + if (i >= MAXAVPAIRS) { + generr(h, "too many AV pairs"); + goto fail; + } + for (p = avs[i], len = 0; is_arg(*p); p++) + len++; + if (p == avs[i] || *p != '=') { + generr(h, "invalid AV pair %d", i); + goto fail; + } + while (*p++ != '\0') + len++; + if ((srvp->avs[i].data = xstrdup(h, avs[i])) == NULL) + goto fail; + srvp->avs[i].len = len; + srvp->navs++; + } h->num_servers++; return 0; +fail: + memset_s(srvp->secret, strlen(srvp->secret), 0, strlen(srvp->secret)); + free(srvp->secret); + srvp->secret = NULL; + for (i = 0; i < srvp->navs; i++) { + free(srvp->avs[i].data); + srvp->avs[i].data = NULL; + srvp->avs[i].len = 0; + } + return -1; +} + +int +tac_add_server(struct tac_handle *h, const char *host, int port, + const char *secret, int timeout, int flags) +{ + const char *const *avs = { NULL }; + + return tac_add_server_av(h, host, port, secret, timeout, flags, avs); } void @@ -819,12 +783,22 @@ tac_close(struct tac_handle *h) free(h); } +static void +freev(char **fields, int nfields) +{ + if (fields != NULL) { + while (nfields-- > 0) + free(fields[nfields]); + free(fields); + } +} + int tac_config(struct tac_handle *h, const char *path) { FILE *fp; - char buf[MAXCONFLINE]; - int linenum; + char **fields; + int linenum, nfields; int retval; if (path == NULL) @@ -834,46 +808,23 @@ tac_config(struct tac_handle *h, const char *path) return -1; } retval = 0; - linenum = 0; - while (fgets(buf, sizeof buf, fp) != NULL) { - int len; - char *fields[4]; - int nfields; - char msg[ERRSIZE]; + linenum = nfields = 0; + fields = NULL; + while ((fields = openpam_readlinev(fp, &linenum, &nfields)) != NULL) { char *host, *res; char *port_str; char *secret; char *timeout_str; - char *options_str; char *end; unsigned long timeout; int port; int options; + int i; - linenum++; - len = strlen(buf); - /* We know len > 0, else fgets would have returned NULL. */ - if (buf[len - 1] != '\n') { - if (len >= sizeof buf - 1) - generr(h, "%s:%d: line too long", path, - linenum); - else - generr(h, "%s:%d: missing newline", path, - linenum); - retval = -1; - break; - } - buf[len - 1] = '\0'; - - /* Extract the fields from the line. */ - nfields = split(buf, fields, 4, msg, sizeof msg); - if (nfields == -1) { - generr(h, "%s:%d: %s", path, linenum, msg); - retval = -1; - break; - } - if (nfields == 0) + if (nfields == 0) { + freev(fields, nfields); continue; + } if (nfields < 2) { generr(h, "%s:%d: missing shared secret", path, linenum); @@ -882,8 +833,6 @@ tac_config(struct tac_handle *h, const char *path) } host = fields[0]; secret = fields[1]; - timeout_str = fields[2]; - options_str = fields[3]; /* Parse and validate the fields. */ res = host; @@ -899,7 +848,10 @@ tac_config(struct tac_handle *h, const char *path) } } else port = 0; - if (timeout_str != NULL) { + i = 2; + if (nfields > i && strlen(fields[i]) > 0 && + strspn(fields[i], "0123456789") == strlen(fields[i])) { + timeout_str = fields[i]; timeout = strtoul(timeout_str, &end, 10); if (timeout_str[0] == '\0' || *end != '\0') { generr(h, "%s:%d: invalid timeout", path, @@ -907,22 +859,17 @@ tac_config(struct tac_handle *h, const char *path) retval = -1; break; } + i++; } else timeout = TIMEOUT; options = 0; - if (options_str != NULL) { - if (strcmp(options_str, "single-connection") == 0) - options |= TAC_SRVR_SINGLE_CONNECT; - else { - generr(h, "%s:%d: invalid option \"%s\"", - path, linenum, options_str); - retval = -1; - break; - } - }; - - if (tac_add_server(h, host, port, secret, timeout, - options) == -1) { + if (nfields > i && + strcmp(fields[i], "single-connection") == 0) { + options |= TAC_SRVR_SINGLE_CONNECT; + i++; + } + if (tac_add_server_av(h, host, port, secret, timeout, + options, (const char *const *)(fields + i)) == -1) { char msg[ERRSIZE]; strcpy(msg, h->errmsg); @@ -930,9 +877,10 @@ tac_config(struct tac_handle *h, const char *path) retval = -1; break; } + memset_s(secret, strlen(secret), 0, strlen(secret)); + freev(fields, nfields); } - /* Clear out the buffer to wipe a possible copy of a shared secret */ - memset(buf, 0, sizeof buf); + freev(fields, nfields); fclose(fp); return retval; } @@ -1038,17 +986,17 @@ tac_open(void) h->num_servers = 0; h->cur_server = 0; h->errmsg[0] = '\0'; - init_clnt_str(&h->user); - init_clnt_str(&h->port); - init_clnt_str(&h->rem_addr); - init_clnt_str(&h->data); - init_clnt_str(&h->user_msg); + init_str(&h->user); + init_str(&h->port); + init_str(&h->rem_addr); + init_str(&h->data); + init_str(&h->user_msg); for (i=0; i<MAXAVPAIRS; i++) { - init_clnt_str(&(h->avs[i])); - init_srvr_str(&(h->srvr_avs[i])); + init_str(&(h->avs[i])); + init_str(&(h->srvr_avs[i])); } - init_srvr_str(&h->srvr_msg); - init_srvr_str(&h->srvr_data); + init_str(&h->srvr_msg); + init_str(&h->srvr_data); } return h; } @@ -1091,8 +1039,8 @@ tac_send_authen(struct tac_handle *h) /* Scan the optional fields in the reply. */ ar = &h->response.u.authen_reply; h->srvr_pos = offsetof(struct tac_authen_reply, rest[0]); - if (get_srvr_str(h, "msg", &h->srvr_msg, ntohs(ar->msg_len)) == -1 || - get_srvr_str(h, "data", &h->srvr_data, ntohs(ar->data_len)) == -1 || + if (get_str(h, "msg", &h->srvr_msg, ntohs(ar->msg_len)) == -1 || + get_str(h, "data", &h->srvr_data, ntohs(ar->data_len)) == -1 || get_srvr_end(h) == -1) return -1; @@ -1112,6 +1060,7 @@ tac_send_author(struct tac_handle *h) char dbgstr[64]; struct tac_author_request *areq = &h->request.u.author_request; struct tac_author_response *ares = &h->response.u.author_response; + struct tac_server *srvp; h->request.length = htonl(offsetof(struct tac_author_request, rest[0])); @@ -1145,23 +1094,25 @@ tac_send_author(struct tac_handle *h) /* Send the message and retrieve the reply. */ if (send_msg(h) == -1 || recv_msg(h) == -1) return -1; + srvp = &h->servers[h->cur_server]; /* Update the offset in the response packet based on av pairs count */ h->srvr_pos = offsetof(struct tac_author_response, rest[0]) + ares->av_cnt; /* Scan the optional fields in the response. */ - if (get_srvr_str(h, "msg", &h->srvr_msg, ntohs(ares->msg_len)) == -1 || - get_srvr_str(h, "data", &h->srvr_data, ntohs(ares->data_len)) ==-1) + if (get_str(h, "msg", &h->srvr_msg, ntohs(ares->msg_len)) == -1 || + get_str(h, "data", &h->srvr_data, ntohs(ares->data_len)) ==-1) return -1; /* Get each AV pair (just setting pointers, not malloc'ing) */ clear_srvr_avs(h); for (i=0; i<ares->av_cnt; i++) { snprintf(dbgstr, sizeof dbgstr, "av-pair-%d", i); - if (get_srvr_str(h, dbgstr, &(h->srvr_avs[i]), + if (get_str(h, dbgstr, &(h->srvr_avs[i]), ares->rest[i]) == -1) return -1; + h->srvr_navs++; } /* Should have ended up at the end */ @@ -1172,7 +1123,7 @@ tac_send_author(struct tac_handle *h) if (!h->single_connect) close_connection(h); - return ares->av_cnt << 8 | ares->status; + return (h->srvr_navs + srvp->navs) << 8 | ares->status; } int @@ -1206,8 +1157,8 @@ tac_send_acct(struct tac_handle *h) /* reply */ h->srvr_pos = offsetof(struct tac_acct_reply, rest[0]); - if (get_srvr_str(h, "msg", &h->srvr_msg, ntohs(ar->msg_len)) == -1 || - get_srvr_str(h, "data", &h->srvr_data, ntohs(ar->data_len)) == -1 || + if (get_str(h, "msg", &h->srvr_msg, ntohs(ar->msg_len)) == -1 || + get_str(h, "data", &h->srvr_data, ntohs(ar->data_len)) == -1 || get_srvr_end(h) == -1) return -1; @@ -1270,41 +1221,41 @@ tac_set_av(struct tac_handle *h, u_int index, const char *av) char * tac_get_av(struct tac_handle *h, u_int index) { - if (index >= MAXAVPAIRS) - return NULL; - return dup_str(h, &(h->srvr_avs[index]), NULL); + struct tac_server *srvp; + + if (index < h->srvr_navs) + return dup_str(h, &h->srvr_avs[index], NULL); + index -= h->srvr_navs; + srvp = &h->servers[h->cur_server]; + if (index < srvp->navs) + return xstrdup(h, srvp->avs[index].data); + return NULL; } char * tac_get_av_value(struct tac_handle *h, const char *attribute) { - int i, len; - const char *ch, *end; - const char *candidate; - int candidate_len; + int i, attr_len; int found_seperator; - struct srvr_str srvr; + char *ch, *end; + struct tac_str *candidate; + struct tac_str value; + struct tac_server *srvp = &h->servers[h->cur_server]; - if (attribute == NULL || ((len = strlen(attribute)) == 0)) + if (attribute == NULL || (attr_len = strlen(attribute)) == 0) return NULL; - for (i=0; i<MAXAVPAIRS; i++) { - candidate = h->srvr_avs[i].data; - candidate_len = h->srvr_avs[i].len; + for (i = 0; i < h->srvr_navs + srvp->navs; i++) { + if (i < h->srvr_navs) + candidate = &h->srvr_avs[i]; + else + candidate = &srvp->avs[i - h->srvr_navs]; - /* - * Valid 'srvr_avs' guaranteed to be contiguous starting at - * index 0 (not necessarily the case with 'avs'). Break out - * when the "end" of the list has been reached. - */ - if (!candidate) - break; - - if (len < candidate_len && - !strncmp(candidate, attribute, len)) { + if (attr_len < candidate->len && + strncmp(candidate->data, attribute, attr_len) == 0) { - ch = candidate + len; - end = candidate + candidate_len; + ch = candidate->data + attr_len; + end = candidate->data + candidate->len; /* * Sift out the white space between A and V (should not @@ -1331,9 +1282,9 @@ tac_get_av_value(struct tac_handle *h, const char *attribute) * dup_str() will handle srvr.len == 0 correctly. */ if (found_seperator == 1) { - srvr.len = end - ch; - srvr.data = ch; - return dup_str(h, &srvr, NULL); + value.len = end - ch; + value.data = ch; + return dup_str(h, &value, NULL); } } } @@ -1352,8 +1303,10 @@ static void clear_srvr_avs(struct tac_handle *h) { int i; - for (i=0; i<MAXAVPAIRS; i++) - init_srvr_str(&(h->srvr_avs[i])); + + for (i = 0; i < h->srvr_navs; i++) + init_str(&(h->srvr_avs[i])); + h->srvr_navs = 0; } diff --git a/lib/libtacplus/taclib_private.h b/lib/libtacplus/taclib_private.h index 665616f1f200..43203b72f6ca 100644 --- a/lib/libtacplus/taclib_private.h +++ b/lib/libtacplus/taclib_private.h @@ -58,30 +58,8 @@ #define TAC_UNENCRYPTED 0x01 #define TAC_SINGLE_CONNECT 0x04 -struct tac_server { - struct sockaddr_in addr; /* Address of server */ - char *secret; /* Shared secret */ - int timeout; /* Timeout in seconds */ - int flags; -}; - -/* - * An optional string of bytes specified by the client for inclusion in - * a request. The data is always a dynamically allocated copy that - * belongs to the library. It is copied into the request packet just - * before sending the request. - */ -struct clnt_str { - void *data; - size_t len; -}; - -/* - * An optional string of bytes from a server response. The data resides - * in the response packet itself, and must not be freed. - */ -struct srvr_str { - const void *data; +struct tac_str { + char *data; size_t len; }; @@ -171,6 +149,15 @@ struct tac_msg { } u; }; +struct tac_server { + struct sockaddr_in addr; /* Address of server */ + char *secret; /* Shared secret */ + int timeout; /* Timeout in seconds */ + int flags; + unsigned int navs; + struct tac_str avs[MAXAVPAIRS]; +}; + struct tac_handle { int fd; /* Socket file descriptor */ struct tac_server servers[MAXSERVERS]; /* Servers to contact */ @@ -180,20 +167,30 @@ struct tac_handle { int last_seq_no; char errmsg[ERRSIZE]; /* Most recent error message */ - struct clnt_str user; - struct clnt_str port; - struct clnt_str rem_addr; - struct clnt_str data; - struct clnt_str user_msg; - struct clnt_str avs[MAXAVPAIRS]; + struct tac_str user; + struct tac_str port; + struct tac_str rem_addr; + struct tac_str data; + struct tac_str user_msg; + struct tac_str avs[MAXAVPAIRS]; struct tac_msg request; struct tac_msg response; int srvr_pos; /* Scan position in response body */ - struct srvr_str srvr_msg; - struct srvr_str srvr_data; - struct srvr_str srvr_avs[MAXAVPAIRS]; + unsigned int srvr_navs; + struct tac_str srvr_msg; + struct tac_str srvr_data; + struct tac_str srvr_avs[MAXAVPAIRS]; }; +#define is_alpha(ch) /* alphabetical */ \ + (((ch) >= 'A' && (ch) <= 'Z') || ((ch) >= 'a' && (ch) <= 'z')) +#define is_num(ch) /* numerical */ \ + ((ch) >= '0' && (ch) <= '9') +#define is_alnum(ch) /* alphanumerical */ \ + (is_alpha(ch) || is_num(ch)) +#define is_arg(ch) /* valid in an argument name */ \ + (is_alnum(ch) || (ch) == '_' || (ch) == '-') + #endif diff --git a/lib/libtacplus/tacplus.conf.5 b/lib/libtacplus/tacplus.conf.5 index 9016a25faad0..2653c664d67e 100644 --- a/lib/libtacplus/tacplus.conf.5 +++ b/lib/libtacplus/tacplus.conf.5 @@ -22,7 +22,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd July 29, 1998 +.Dd June 13, 2023 .Dt TACPLUS.CONF 5 .Os .Sh NAME @@ -44,23 +44,9 @@ Leading white space is ignored, as are empty lines and lines containing only comments. .Pp -A TACACS+ server is described by two to four fields on a line. -The -fields are separated by white space. -The -.Ql # -character at the beginning of a field begins a comment, which extends -to the end of the line. -A field may be enclosed in double quotes, -in which case it may contain white space and/or begin with the -.Ql # -character. -Within a quoted string, the double quote character can -be represented by -.Ql \e\&" , -and the backslash can be represented by -.Ql \e\e . -No other escape sequences are supported. +A TACACS+ server is described by a minimum of two fields on a line. +The fields are separated by whitespace and follow the same rules for +comments, quoting, escaping, and line continuation as the POSIX shell. .Pp The first field specifies the server host, either as a fully qualified domain name or as a @@ -81,12 +67,11 @@ An empty secret disables the normal encryption mechanism, causing all data to cross the network in cleartext. .Pp -The third field contains a decimal integer specifying the timeout -in seconds for communicating with the server. +The optional third field may contain a decimal integer specifying the +timeout in seconds for communicating with the server. The timeout applies separately to each connect, write, and read operation. -If this field -is omitted, it defaults to 3 seconds. +If this field is omitted, it defaults to 3 seconds. .Pp The optional fourth field may contain the string .Ql single-connection . @@ -96,6 +81,11 @@ sessions. Some older TACACS+ servers become confused if this option is specified. .Pp +Any subsequent fields must be of the form +.Ar attribute Ns = Ns Ar value +and will be appended to authorization responses as if they had been +sent by the server. +.Pp Up to 10 TACACS+ servers may be specified. The servers are tried in order, until a valid response is received or the list is exhausted. @@ -118,11 +108,13 @@ shared secrets, it should not be readable except by root. tacserver.domain.com OurLittleSecret # A server using a non-standard port, with an increased timeout and -# the "single-connection" option. -auth.domain.com:4333 "Don't tell!!" 15 single-connection +# the "single-connection" option, and overrides for the for uid, gid +# and shell attributes. +auth.domain.com:4333 "Don't tell!!" 15 single-connection \e + uid=1001 gid=20 shell="/usr/local/bin/zsh" # A server specified by its IP address: -192.168.27.81 $X*#..38947ax-+= +192.168.27.81 $X*#..38947ax-+= shell="/sbin/nologin" .Ed .Sh SEE ALSO .Xr libtacplus 3 diff --git a/share/mk/src.libnames.mk b/share/mk/src.libnames.mk index 054fa9099025..4963a9c02436 100644 --- a/share/mk/src.libnames.mk +++ b/share/mk/src.libnames.mk @@ -396,7 +396,7 @@ _DP_c+= ssp_nonshared .endif _DP_stats= sbuf pthread _DP_stdthreads= pthread -_DP_tacplus= md +_DP_tacplus= md pam _DP_nvpair= spl _DP_panelw= ncursesw _DP_rpcsec_gss= gssapi
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